Merge branch 'feat/collaboration' into feat/collaboration2

api/.env.example

@@ -33,6 +33,9 @@ TRIGGER_URL=http://localhost:5001
 # The time in seconds after the signature is rejected
 FILES_ACCESS_TIMEOUT=300
 
+# Collaboration mode toggle
+ENABLE_COLLABORATION_MODE=false
+
 # Access token expiration time in minutes
 ACCESS_TOKEN_EXPIRE_MINUTES=60
 

api/app.py

@@ -1,3 +1,4 @@
+import os
 import sys
 
 
@@ -8,10 +9,16 @@ def is_db_command() -> bool:
 
 
 # create app
+celery = None
+flask_app = None
+socketio_app = None
+
 if is_db_command():
     from app_factory import create_migrations_app
 
     app = create_migrations_app()
+    socketio_app = app
+    flask_app = app
 else:
     # Gunicorn and Celery handle monkey patching automatically in production by
     # specifying the `gevent` worker class. Manual monkey patching is not required here.
@@ -22,8 +29,15 @@ else:
 
     from app_factory import create_app
 
-    app = create_app()
-    celery = app.extensions["celery"]
+    socketio_app, flask_app = create_app()
+    app = flask_app
+    celery = flask_app.extensions["celery"]
 
 if __name__ == "__main__":
-    app.run(host="0.0.0.0", port=5001)
+    from gevent import pywsgi
+    from geventwebsocket.handler import WebSocketHandler
+
+    host = os.environ.get("HOST", "0.0.0.0")
+    port = int(os.environ.get("PORT", 5001))
+    server = pywsgi.WSGIServer((host, port), socketio_app, handler_class=WebSocketHandler)
+    server.serve_forever()

api/app_factory.py

@@ -31,14 +31,22 @@ def create_flask_app_with_configs() -> DifyApp:
     return dify_app
 
 
-def create_app() -> DifyApp:
+def create_app() -> tuple[any, DifyApp]:
     start_time = time.perf_counter()
     app = create_flask_app_with_configs()
     initialize_extensions(app)
+
+    import socketio
+
+    from extensions.ext_socketio import sio
+
+    sio.app = app
+    socketio_app = socketio.WSGIApp(sio, app)
+
     end_time = time.perf_counter()
     if dify_config.DEBUG:
         logger.info("Finished create_app (%s ms)", round((end_time - start_time) * 1000, 2))
-    return app
+    return socketio_app, app
 
 
 def initialize_extensions(app: DifyApp):

api/configs/feature/__init__.py

@@ -1150,6 +1150,13 @@ class PositionConfig(BaseSettings):
         return {item.strip() for item in self.POSITION_TOOL_EXCLUDES.split(",") if item.strip() != ""}
 
 
+class CollaborationConfig(BaseSettings):
+    ENABLE_COLLABORATION_MODE: bool = Field(
+        description="Whether to enable collaboration mode features across the workspace",
+        default=False,
+    )
+
+
 class LoginConfig(BaseSettings):
     ENABLE_EMAIL_CODE_LOGIN: bool = Field(
         description="whether to enable email code login",
@@ -1248,6 +1255,7 @@ class FeatureConfig(
     WorkflowConfig,
     WorkflowNodeExecutionConfig,
     WorkspaceConfig,
+    CollaborationConfig,
     LoginConfig,
     AccountConfig,
     SwaggerUIConfig,

api/controllers/console/__init__.py

@@ -58,11 +58,13 @@ from .app import (
     mcp_server,
     message,
     model_config,
+    online_user,
     ops_trace,
     site,
     statistic,
     workflow,
     workflow_app_log,
+    workflow_comment,
     workflow_draft_variable,
     workflow_run,
     workflow_statistic,

api/controllers/console/app/online_user.py

@@ -0,0 +1,339 @@
+import json
+import time
+
+from werkzeug.wrappers import Request as WerkzeugRequest
+
+from extensions.ext_redis import redis_client
+from extensions.ext_socketio import sio
+from libs.passport import PassportService
+from libs.token import extract_access_token
+from services.account_service import AccountService
+
+SESSION_STATE_TTL_SECONDS = 3600
+WORKFLOW_ONLINE_USERS_PREFIX = "workflow_online_users:"
+WORKFLOW_LEADER_PREFIX = "workflow_leader:"
+WS_SID_MAP_PREFIX = "ws_sid_map:"
+
+
+def _workflow_key(workflow_id: str) -> str:
+    return f"{WORKFLOW_ONLINE_USERS_PREFIX}{workflow_id}"
+
+
+def _leader_key(workflow_id: str) -> str:
+    return f"{WORKFLOW_LEADER_PREFIX}{workflow_id}"
+
+
+def _sid_key(sid: str) -> str:
+    return f"{WS_SID_MAP_PREFIX}{sid}"
+
+
+def _refresh_session_state(workflow_id: str, sid: str) -> None:
+    """
+    Refresh TTLs for workflow + session keys so healthy sessions do not linger forever after crashes.
+    """
+    workflow_key = _workflow_key(workflow_id)
+    sid_key = _sid_key(sid)
+    if redis_client.exists(workflow_key):
+        redis_client.expire(workflow_key, SESSION_STATE_TTL_SECONDS)
+    if redis_client.exists(sid_key):
+        redis_client.expire(sid_key, SESSION_STATE_TTL_SECONDS)
+
+
+@sio.on("connect")
+def socket_connect(sid, environ, auth):
+    """
+    WebSocket connect event, do authentication here.
+    """
+    token = None
+    if auth and isinstance(auth, dict):
+        token = auth.get("token")
+
+    if not token:
+        try:
+            request_environ = WerkzeugRequest(environ)
+            token = extract_access_token(request_environ)
+        except Exception:
+            token = None
+
+    if not token:
+        return False
+
+    try:
+        decoded = PassportService().verify(token)
+        user_id = decoded.get("user_id")
+        if not user_id:
+            return False
+
+        with sio.app.app_context():
+            user = AccountService.load_logged_in_account(account_id=user_id)
+            if not user:
+                return False
+
+            sio.save_session(sid, {"user_id": user.id, "username": user.name, "avatar": user.avatar})
+
+            return True
+
+    except Exception:
+        return False
+
+
+@sio.on("user_connect")
+def handle_user_connect(sid, data):
+    """
+    Handle user connect event. Each session (tab) is treated as an independent collaborator.
+    """
+
+    workflow_id = data.get("workflow_id")
+    if not workflow_id:
+        return {"msg": "workflow_id is required"}, 400
+
+    session = sio.get_session(sid)
+    user_id = session.get("user_id")
+
+    if not user_id:
+        return {"msg": "unauthorized"}, 401
+
+    # Each session is stored independently with sid as key
+    session_info = {
+        "user_id": user_id,
+        "username": session.get("username", "Unknown"),
+        "avatar": session.get("avatar", None),
+        "sid": sid,
+        "connected_at": int(time.time()),  # Add timestamp to differentiate tabs
+    }
+
+    workflow_key = _workflow_key(workflow_id)
+    # Store session info with sid as key
+    redis_client.hset(workflow_key, sid, json.dumps(session_info))
+    redis_client.set(
+        _sid_key(sid),
+        json.dumps({"workflow_id": workflow_id, "user_id": user_id}),
+        ex=SESSION_STATE_TTL_SECONDS,
+    )
+    _refresh_session_state(workflow_id, sid)
+
+    # Leader election: first session becomes the leader
+    leader_sid = get_or_set_leader(workflow_id, sid)
+    is_leader = leader_sid == sid
+
+    sio.enter_room(sid, workflow_id)
+    broadcast_online_users(workflow_id)
+
+    # Notify this session of their leader status
+    sio.emit("status", {"isLeader": is_leader}, room=sid)
+
+    return {"msg": "connected", "user_id": user_id, "sid": sid, "isLeader": is_leader}
+
+
+@sio.on("disconnect")
+def handle_disconnect(sid):
+    """
+    Handle session disconnect event. Remove the specific session from online users.
+    """
+    mapping = redis_client.get(_sid_key(sid))
+    if mapping:
+        data = json.loads(mapping)
+        workflow_id = data["workflow_id"]
+
+        # Remove this specific session
+        redis_client.hdel(_workflow_key(workflow_id), sid)
+        redis_client.delete(_sid_key(sid))
+
+        # Handle leader re-election if the leader session disconnected
+        handle_leader_disconnect(workflow_id, sid)
+
+        broadcast_online_users(workflow_id)
+
+
+def _clear_session_state(workflow_id: str, sid: str) -> None:
+    redis_client.hdel(_workflow_key(workflow_id), sid)
+    redis_client.delete(_sid_key(sid))
+
+
+def _is_session_active(workflow_id: str, sid: str) -> bool:
+    if not sid:
+        return False
+
+    try:
+        if not sio.manager.is_connected(sid, "/"):
+            return False
+    except AttributeError:
+        return False
+
+    if not redis_client.hexists(_workflow_key(workflow_id), sid):
+        return False
+
+    if not redis_client.exists(_sid_key(sid)):
+        return False
+
+    return True
+
+
+def get_or_set_leader(workflow_id: str, sid: str) -> str:
+    """
+    Get current leader session or set this session as leader if no valid leader exists.
+    Returns the leader session id (sid).
+    """
+    raw_leader = redis_client.get(_leader_key(workflow_id))
+    current_leader = raw_leader.decode("utf-8") if isinstance(raw_leader, bytes) else raw_leader
+    leader_replaced = False
+
+    if current_leader and not _is_session_active(workflow_id, current_leader):
+        _clear_session_state(workflow_id, current_leader)
+        redis_client.delete(_leader_key(workflow_id))
+        current_leader = None
+        leader_replaced = True
+
+    if not current_leader:
+        redis_client.set(_leader_key(workflow_id), sid, ex=SESSION_STATE_TTL_SECONDS)  # Expire in 1 hour
+        if leader_replaced:
+            broadcast_leader_change(workflow_id, sid)
+        return sid
+
+    return current_leader
+
+
+def handle_leader_disconnect(workflow_id, disconnected_sid):
+    """
+    Handle leader re-election when a session disconnects.
+    If the disconnected session was the leader, elect a new leader from remaining sessions.
+    """
+    current_leader = redis_client.get(_leader_key(workflow_id))
+
+    if current_leader:
+        current_leader = current_leader.decode("utf-8") if isinstance(current_leader, bytes) else current_leader
+
+        if current_leader == disconnected_sid:
+            # Leader session disconnected, elect a new leader
+            sessions_json = redis_client.hgetall(_workflow_key(workflow_id))
+
+            if sessions_json:
+                # Get the first remaining session as new leader
+                new_leader_sid = list(sessions_json.keys())[0]
+                if isinstance(new_leader_sid, bytes):
+                    new_leader_sid = new_leader_sid.decode("utf-8")
+
+                redis_client.set(_leader_key(workflow_id), new_leader_sid, ex=SESSION_STATE_TTL_SECONDS)
+
+                # Notify all sessions about the new leader
+                broadcast_leader_change(workflow_id, new_leader_sid)
+            else:
+                # No sessions left, remove leader
+                redis_client.delete(_leader_key(workflow_id))
+
+
+def broadcast_leader_change(workflow_id, new_leader_sid):
+    """
+    Broadcast leader change to all sessions in the workflow.
+    """
+    sessions_json = redis_client.hgetall(_workflow_key(workflow_id))
+
+    for sid, session_info_json in sessions_json.items():
+        try:
+            sid_str = sid.decode("utf-8") if isinstance(sid, bytes) else sid
+            is_leader = sid_str == new_leader_sid
+            # Emit to each session whether they are the new leader
+            sio.emit("status", {"isLeader": is_leader}, room=sid_str)
+        except Exception:
+            continue
+
+
+def get_current_leader(workflow_id):
+    """
+    Get the current leader for a workflow.
+    """
+    leader = redis_client.get(_leader_key(workflow_id))
+    return leader.decode("utf-8") if leader and isinstance(leader, bytes) else leader
+
+
+def broadcast_online_users(workflow_id):
+    """
+    Broadcast online users to the workflow room.
+    Each session is shown as a separate user (even if same person has multiple tabs).
+    """
+    sessions_json = redis_client.hgetall(_workflow_key(workflow_id))
+    users = []
+
+    for sid, session_info_json in sessions_json.items():
+        try:
+            session_info = json.loads(session_info_json)
+            # Each session appears as a separate "user" in the UI
+            users.append(
+                {
+                    "user_id": session_info["user_id"],
+                    "username": session_info["username"],
+                    "avatar": session_info.get("avatar"),
+                    "sid": session_info["sid"],
+                    "connected_at": session_info.get("connected_at"),
+                }
+            )
+        except Exception:
+            continue
+
+    # Sort by connection time to maintain consistent order
+    users.sort(key=lambda x: x.get("connected_at") or 0)
+
+    # Get current leader session
+    leader_sid = get_current_leader(workflow_id)
+
+    sio.emit("online_users", {"workflow_id": workflow_id, "users": users, "leader": leader_sid}, room=workflow_id)
+
+
+@sio.on("collaboration_event")
+def handle_collaboration_event(sid, data):
+    """
+    Handle general collaboration events, include:
+    1. mouse_move
+    2. vars_and_features_update
+    3. sync_request (ask leader to update graph)
+    4. app_state_update
+    5. mcp_server_update
+    6. workflow_update
+    7. comments_update
+    8. node_panel_presence
+
+    """
+    mapping = redis_client.get(_sid_key(sid))
+
+    if not mapping:
+        return {"msg": "unauthorized"}, 401
+
+    mapping_data = json.loads(mapping)
+    workflow_id = mapping_data["workflow_id"]
+    user_id = mapping_data["user_id"]
+    _refresh_session_state(workflow_id, sid)
+
+    event_type = data.get("type")
+    event_data = data.get("data")
+    timestamp = data.get("timestamp", int(time.time()))
+
+    if not event_type:
+        return {"msg": "invalid event type"}, 400
+
+    sio.emit(
+        "collaboration_update",
+        {"type": event_type, "userId": user_id, "data": event_data, "timestamp": timestamp},
+        room=workflow_id,
+        skip_sid=sid,
+    )
+
+    return {"msg": "event_broadcasted"}
+
+
+@sio.on("graph_event")
+def handle_graph_event(sid, data):
+    """
+    Handle graph events - simple broadcast relay.
+    """
+    mapping = redis_client.get(_sid_key(sid))
+
+    if not mapping:
+        return {"msg": "unauthorized"}, 401
+
+    mapping_data = json.loads(mapping)
+    workflow_id = mapping_data["workflow_id"]
+    _refresh_session_state(workflow_id, sid)
+
+    sio.emit("graph_update", data, room=workflow_id, skip_sid=sid)
+
+    return {"msg": "graph_update_broadcasted"}

api/controllers/console/app/workflow.py

@@ -9,6 +9,7 @@ from sqlalchemy.orm import Session
 from werkzeug.exceptions import Forbidden, InternalServerError, NotFound
 
 import services
+from configs import dify_config
 from controllers.console import api, console_ns
 from controllers.console.app.error import ConversationCompletedError, DraftWorkflowNotExist, DraftWorkflowNotSync
 from controllers.console.app.wraps import get_app_model
@@ -31,7 +32,9 @@ from core.trigger.debug.event_selectors import (
 from core.workflow.enums import NodeType
 from core.workflow.graph_engine.manager import GraphEngineManager
 from extensions.ext_database import db
+from extensions.ext_redis import redis_client
 from factories import file_factory, variable_factory
+from fields.online_user_fields import online_user_list_fields
 from fields.workflow_fields import workflow_fields, workflow_pagination_fields
 from fields.workflow_run_fields import workflow_run_node_execution_fields
 from libs import helper
@@ -144,6 +147,7 @@ class DraftWorkflowApi(Resource):
                 .add_argument("hash", type=str, required=False, location="json")
                 .add_argument("environment_variables", type=list, required=True, location="json")
                 .add_argument("conversation_variables", type=list, required=False, location="json")
+                .add_argument("force_upload", type=bool, required=False, default=False, location="json")
             )
             args = parser.parse_args()
         elif "text/plain" in content_type:
@@ -161,6 +165,7 @@ class DraftWorkflowApi(Resource):
                     "hash": data.get("hash"),
                     "environment_variables": data.get("environment_variables"),
                     "conversation_variables": data.get("conversation_variables"),
+                    "force_upload": data.get("force_upload", False),
                 }
             except json.JSONDecodeError:
                 return {"message": "Invalid JSON data"}, 400
@@ -185,6 +190,7 @@ class DraftWorkflowApi(Resource):
                 account=current_user,
                 environment_variables=environment_variables,
                 conversation_variables=conversation_variables,
+                force_upload=args.get("force_upload", False),
             )
         except WorkflowHashNotEqualError:
             raise DraftWorkflowNotSync()
@@ -756,6 +762,46 @@ class ConvertToWorkflowApi(Resource):
         }
 
 
+@console_ns.route("/apps/<uuid:app_id>/workflows/draft/config")
+class WorkflowConfigApi(Resource):
+    """Resource for workflow configuration."""
+
+    @api.doc("get_workflow_config")
+    @api.doc(description="Get workflow configuration")
+    @api.doc(params={"app_id": "Application ID"})
+    @api.response(200, "Workflow configuration retrieved successfully")
+    @setup_required
+    @login_required
+    @account_initialization_required
+    @get_app_model(mode=[AppMode.ADVANCED_CHAT, AppMode.WORKFLOW])
+    def get(self, app_model: App):
+        return {
+            "parallel_depth_limit": dify_config.WORKFLOW_PARALLEL_DEPTH_LIMIT,
+        }
+
+
+@console_ns.route("/apps/<uuid:app_id>/workflows/draft/features")
+class WorkflowFeaturesApi(Resource):
+    """Update draft workflow features."""
+
+    @setup_required
+    @login_required
+    @account_initialization_required
+    @get_app_model(mode=[AppMode.ADVANCED_CHAT, AppMode.WORKFLOW])
+    def post(self, app_model: App):
+        current_user, _ = current_account_with_tenant()
+
+        parser = reqparse.RequestParser().add_argument("features", type=dict, required=True, location="json")
+        args = parser.parse_args()
+
+        features = args.get("features")
+
+        workflow_service = WorkflowService()
+        workflow_service.update_draft_workflow_features(app_model=app_model, features=features, account=current_user)
+
+        return {"result": "success"}
+
+
 @console_ns.route("/apps/<uuid:app_id>/workflows")
 class PublishedAllWorkflowApi(Resource):
     @api.doc("get_all_published_workflows")
@@ -1168,3 +1214,30 @@ class DraftWorkflowTriggerRunAllApi(Resource):
                     "status": "error",
                 }
             ), 400
+
+
+@console_ns.route("/apps/workflows/online-users")
+class WorkflowOnlineUsersApi(Resource):
+    @setup_required
+    @login_required
+    @account_initialization_required
+    @marshal_with(online_user_list_fields)
+    def get(self):
+        parser = reqparse.RequestParser().add_argument("workflow_ids", type=str, required=True, location="args")
+        args = parser.parse_args()
+
+        workflow_ids = [workflow_id.strip() for workflow_id in args["workflow_ids"].split(",")]
+
+        results = []
+        for workflow_id in workflow_ids:
+            users_json = redis_client.hgetall(f"workflow_online_users:{workflow_id}")
+
+            users = []
+            for _, user_info_json in users_json.items():
+                try:
+                    users.append(json.loads(user_info_json))
+                except Exception:
+                    continue
+            results.append({"workflow_id": workflow_id, "users": users})
+
+        return {"data": results}

api/controllers/console/app/workflow_comment.py

@@ -0,0 +1,240 @@
+import logging
+
+from flask_restx import Resource, fields, marshal_with, reqparse
+
+from controllers.console import api
+from controllers.console.app.wraps import get_app_model
+from controllers.console.wraps import account_initialization_required, setup_required
+from fields.member_fields import account_with_role_fields
+from fields.workflow_comment_fields import (
+    workflow_comment_basic_fields,
+    workflow_comment_create_fields,
+    workflow_comment_detail_fields,
+    workflow_comment_reply_create_fields,
+    workflow_comment_reply_update_fields,
+    workflow_comment_resolve_fields,
+    workflow_comment_update_fields,
+)
+from libs.login import current_user, login_required
+from models import App
+from services.account_service import TenantService
+from services.workflow_comment_service import WorkflowCommentService
+
+logger = logging.getLogger(__name__)
+
+
+class WorkflowCommentListApi(Resource):
+    """API for listing and creating workflow comments."""
+
+    @login_required
+    @setup_required
+    @account_initialization_required
+    @get_app_model
+    @marshal_with(workflow_comment_basic_fields, envelope="data")
+    def get(self, app_model: App):
+        """Get all comments for a workflow."""
+        comments = WorkflowCommentService.get_comments(tenant_id=current_user.current_tenant_id, app_id=app_model.id)
+
+        return comments
+
+    @login_required
+    @setup_required
+    @account_initialization_required
+    @get_app_model
+    @marshal_with(workflow_comment_create_fields)
+    def post(self, app_model: App):
+        """Create a new workflow comment."""
+        parser = reqparse.RequestParser()
+        parser.add_argument("position_x", type=float, required=True, location="json")
+        parser.add_argument("position_y", type=float, required=True, location="json")
+        parser.add_argument("content", type=str, required=True, location="json")
+        parser.add_argument("mentioned_user_ids", type=list, location="json", default=[])
+        args = parser.parse_args()
+
+        result = WorkflowCommentService.create_comment(
+            tenant_id=current_user.current_tenant_id,
+            app_id=app_model.id,
+            created_by=current_user.id,
+            content=args.content,
+            position_x=args.position_x,
+            position_y=args.position_y,
+            mentioned_user_ids=args.mentioned_user_ids,
+        )
+
+        return result, 201
+
+
+class WorkflowCommentDetailApi(Resource):
+    """API for managing individual workflow comments."""
+
+    @login_required
+    @setup_required
+    @account_initialization_required
+    @get_app_model
+    @marshal_with(workflow_comment_detail_fields)
+    def get(self, app_model: App, comment_id: str):
+        """Get a specific workflow comment."""
+        comment = WorkflowCommentService.get_comment(
+            tenant_id=current_user.current_tenant_id, app_id=app_model.id, comment_id=comment_id
+        )
+
+        return comment
+
+    @login_required
+    @setup_required
+    @account_initialization_required
+    @get_app_model
+    @marshal_with(workflow_comment_update_fields)
+    def put(self, app_model: App, comment_id: str):
+        """Update a workflow comment."""
+        parser = reqparse.RequestParser()
+        parser.add_argument("content", type=str, required=True, location="json")
+        parser.add_argument("position_x", type=float, required=False, location="json")
+        parser.add_argument("position_y", type=float, required=False, location="json")
+        parser.add_argument("mentioned_user_ids", type=list, location="json", default=[])
+        args = parser.parse_args()
+
+        result = WorkflowCommentService.update_comment(
+            tenant_id=current_user.current_tenant_id,
+            app_id=app_model.id,
+            comment_id=comment_id,
+            user_id=current_user.id,
+            content=args.content,
+            position_x=args.position_x,
+            position_y=args.position_y,
+            mentioned_user_ids=args.mentioned_user_ids,
+        )
+
+        return result
+
+    @login_required
+    @setup_required
+    @account_initialization_required
+    @get_app_model
+    def delete(self, app_model: App, comment_id: str):
+        """Delete a workflow comment."""
+        WorkflowCommentService.delete_comment(
+            tenant_id=current_user.current_tenant_id,
+            app_id=app_model.id,
+            comment_id=comment_id,
+            user_id=current_user.id,
+        )
+
+        return {"result": "success"}, 204
+
+
+class WorkflowCommentResolveApi(Resource):
+    """API for resolving and reopening workflow comments."""
+
+    @login_required
+    @setup_required
+    @account_initialization_required
+    @get_app_model
+    @marshal_with(workflow_comment_resolve_fields)
+    def post(self, app_model: App, comment_id: str):
+        """Resolve a workflow comment."""
+        comment = WorkflowCommentService.resolve_comment(
+            tenant_id=current_user.current_tenant_id,
+            app_id=app_model.id,
+            comment_id=comment_id,
+            user_id=current_user.id,
+        )
+
+        return comment
+
+
+class WorkflowCommentReplyApi(Resource):
+    """API for managing comment replies."""
+
+    @login_required
+    @setup_required
+    @account_initialization_required
+    @get_app_model
+    @marshal_with(workflow_comment_reply_create_fields)
+    def post(self, app_model: App, comment_id: str):
+        """Add a reply to a workflow comment."""
+        # Validate comment access first
+        WorkflowCommentService.validate_comment_access(
+            comment_id=comment_id, tenant_id=current_user.current_tenant_id, app_id=app_model.id
+        )
+
+        parser = reqparse.RequestParser()
+        parser.add_argument("content", type=str, required=True, location="json")
+        parser.add_argument("mentioned_user_ids", type=list, location="json", default=[])
+        args = parser.parse_args()
+
+        result = WorkflowCommentService.create_reply(
+            comment_id=comment_id,
+            content=args.content,
+            created_by=current_user.id,
+            mentioned_user_ids=args.mentioned_user_ids,
+        )
+
+        return result, 201
+
+
+class WorkflowCommentReplyDetailApi(Resource):
+    """API for managing individual comment replies."""
+
+    @login_required
+    @setup_required
+    @account_initialization_required
+    @get_app_model
+    @marshal_with(workflow_comment_reply_update_fields)
+    def put(self, app_model: App, comment_id: str, reply_id: str):
+        """Update a comment reply."""
+        # Validate comment access first
+        WorkflowCommentService.validate_comment_access(
+            comment_id=comment_id, tenant_id=current_user.current_tenant_id, app_id=app_model.id
+        )
+
+        parser = reqparse.RequestParser()
+        parser.add_argument("content", type=str, required=True, location="json")
+        parser.add_argument("mentioned_user_ids", type=list, location="json", default=[])
+        args = parser.parse_args()
+
+        reply = WorkflowCommentService.update_reply(
+            reply_id=reply_id, user_id=current_user.id, content=args.content, mentioned_user_ids=args.mentioned_user_ids
+        )
+
+        return reply
+
+    @login_required
+    @setup_required
+    @account_initialization_required
+    @get_app_model
+    def delete(self, app_model: App, comment_id: str, reply_id: str):
+        """Delete a comment reply."""
+        # Validate comment access first
+        WorkflowCommentService.validate_comment_access(
+            comment_id=comment_id, tenant_id=current_user.current_tenant_id, app_id=app_model.id
+        )
+
+        WorkflowCommentService.delete_reply(reply_id=reply_id, user_id=current_user.id)
+
+        return {"result": "success"}, 204
+
+
+class WorkflowCommentMentionUsersApi(Resource):
+    """API for getting mentionable users for workflow comments."""
+
+    @login_required
+    @setup_required
+    @account_initialization_required
+    @get_app_model
+    @marshal_with({"users": fields.List(fields.Nested(account_with_role_fields))})
+    def get(self, app_model: App):
+        """Get all users in current tenant for mentions."""
+        members = TenantService.get_tenant_members(current_user.current_tenant)
+        return {"users": members}
+
+
+# Register API routes
+api.add_resource(WorkflowCommentListApi, "/apps/<uuid:app_id>/workflow/comments")
+api.add_resource(WorkflowCommentDetailApi, "/apps/<uuid:app_id>/workflow/comments/<string:comment_id>")
+api.add_resource(WorkflowCommentResolveApi, "/apps/<uuid:app_id>/workflow/comments/<string:comment_id>/resolve")
+api.add_resource(WorkflowCommentReplyApi, "/apps/<uuid:app_id>/workflow/comments/<string:comment_id>/replies")
+api.add_resource(
+    WorkflowCommentReplyDetailApi, "/apps/<uuid:app_id>/workflow/comments/<string:comment_id>/replies/<string:reply_id>"
+)
+api.add_resource(WorkflowCommentMentionUsersApi, "/apps/<uuid:app_id>/workflow/comments/mention-users")

api/controllers/console/app/workflow_draft_variable.py

@@ -19,8 +19,8 @@ from core.variables.segments import ArrayFileSegment, FileSegment, Segment
 from core.variables.types import SegmentType
 from core.workflow.constants import CONVERSATION_VARIABLE_NODE_ID, SYSTEM_VARIABLE_NODE_ID
 from extensions.ext_database import db
+from factories import variable_factory
 from factories.file_factory import build_from_mapping, build_from_mappings
-from factories.variable_factory import build_segment_with_type
 from libs.login import current_user, login_required
 from models import Account, App, AppMode
 from models.workflow import WorkflowDraftVariable
@@ -355,7 +355,7 @@ class VariableApi(Resource):
                 if len(raw_value) > 0 and not isinstance(raw_value[0], dict):
                     raise InvalidArgumentError(description=f"expected dict for files[0], got {type(raw_value)}")
                 raw_value = build_from_mappings(mappings=raw_value, tenant_id=app_model.tenant_id)
-            new_value = build_segment_with_type(variable.value_type, raw_value)
+            new_value = variable_factory.build_segment_with_type(variable.value_type, raw_value)
         draft_var_srv.update_variable(variable, name=new_name, value=new_value)
         db.session.commit()
         return variable
@@ -448,8 +448,35 @@ class ConversationVariableCollectionApi(Resource):
         db.session.commit()
         return _get_variable_list(app_model, CONVERSATION_VARIABLE_NODE_ID)
 
+    @setup_required
+    @login_required
+    @account_initialization_required
+    @get_app_model(mode=AppMode.ADVANCED_CHAT)
+    def post(self, app_model: App):
+        # The role of the current user in the ta table must be admin, owner, or editor
+        if not current_user.is_editor:
+            raise Forbidden()
+
+        parser = reqparse.RequestParser()
+        parser.add_argument("conversation_variables", type=list, required=True, location="json")
+        args = parser.parse_args()
+
+        workflow_service = WorkflowService()
+
+        conversation_variables_list = args.get("conversation_variables") or []
+        conversation_variables = [
+            variable_factory.build_conversation_variable_from_mapping(obj) for obj in conversation_variables_list
+        ]
+
+        workflow_service.update_draft_workflow_conversation_variables(
+            app_model=app_model,
+            account=current_user,
+            conversation_variables=conversation_variables,
+        )
+
+        return {"result": "success"}
+
 
-@console_ns.route("/apps/<uuid:app_id>/workflows/draft/system-variables")
 class SystemVariableCollectionApi(Resource):
     @api.doc("get_system_variables")
     @api.doc(description="Get system variables for workflow")
@@ -499,3 +526,44 @@ class EnvironmentVariableCollectionApi(Resource):
             )
 
         return {"items": env_vars_list}
+
+    @setup_required
+    @login_required
+    @account_initialization_required
+    @get_app_model(mode=[AppMode.ADVANCED_CHAT, AppMode.WORKFLOW])
+    def post(self, app_model: App):
+        # The role of the current user in the ta table must be admin, owner, or editor
+        if not current_user.is_editor:
+            raise Forbidden()
+
+        parser = reqparse.RequestParser()
+        parser.add_argument("environment_variables", type=list, required=True, location="json")
+        args = parser.parse_args()
+
+        workflow_service = WorkflowService()
+
+        environment_variables_list = args.get("environment_variables") or []
+        environment_variables = [
+            variable_factory.build_environment_variable_from_mapping(obj) for obj in environment_variables_list
+        ]
+
+        workflow_service.update_draft_workflow_environment_variables(
+            app_model=app_model,
+            account=current_user,
+            environment_variables=environment_variables,
+        )
+
+        return {"result": "success"}
+
+
+api.add_resource(
+    WorkflowVariableCollectionApi,
+    "/apps/<uuid:app_id>/workflows/draft/variables",
+)
+api.add_resource(NodeVariableCollectionApi, "/apps/<uuid:app_id>/workflows/draft/nodes/<string:node_id>/variables")
+api.add_resource(VariableApi, "/apps/<uuid:app_id>/workflows/draft/variables/<uuid:variable_id>")
+api.add_resource(VariableResetApi, "/apps/<uuid:app_id>/workflows/draft/variables/<uuid:variable_id>/reset")
+
+api.add_resource(ConversationVariableCollectionApi, "/apps/<uuid:app_id>/workflows/draft/conversation-variables")
+api.add_resource(SystemVariableCollectionApi, "/apps/<uuid:app_id>/workflows/draft/system-variables")
+api.add_resource(EnvironmentVariableCollectionApi, "/apps/<uuid:app_id>/workflows/draft/environment-variables")

api/controllers/console/workspace/account.py

@@ -32,6 +32,7 @@ from controllers.console.wraps import (
     only_edition_cloud,
     setup_required,
 )
+from core.file import helpers as file_helpers
 from extensions.ext_database import db
 from fields.member_fields import account_fields
 from libs.datetime_utils import naive_utc_now
@@ -128,6 +129,17 @@ class AccountNameApi(Resource):
 
 @console_ns.route("/account/avatar")
 class AccountAvatarApi(Resource):
+    @setup_required
+    @login_required
+    @account_initialization_required
+    def get(self):
+        parser = reqparse.RequestParser()
+        parser.add_argument("avatar", type=str, required=True, location="args")
+        args = parser.parse_args()
+
+        avatar_url = file_helpers.get_signed_file_url(args["avatar"])
+        return {"avatar_url": avatar_url}
+    
     @setup_required
     @login_required
     @account_initialization_required

api/core/rag/datasource/vdb/oracle/oraclevector.py

@@ -289,7 +289,8 @@ class OracleVector(BaseVector):
                 words = pseg.cut(query)
                 current_entity = ""
                 for word, pos in words:
-                    if pos in {"nr", "Ng", "eng", "nz", "n", "ORG", "v"}:  # nr: 人名，ns: 地名，nt: 机构名
+                    # nr: person name, ns: place name, nt: organization name
+                    if pos in {"nr", "Ng", "eng", "nz", "n", "ORG", "v"}:
                         current_entity += word
                     else:
                         if current_entity:

api/core/rag/datasource/vdb/pyvastbase/vastbase_vector.py

@@ -213,7 +213,7 @@ class VastbaseVector(BaseVector):
 
             with self._get_cursor() as cur:
                 cur.execute(SQL_CREATE_TABLE.format(table_name=self.table_name, dimension=dimension))
-                # Vastbase 支持的向量维度取值范围为 [1,16000]
+                # Vastbase supports vector dimensions in range [1, 16000]
                 if dimension <= 16000:
                     cur.execute(SQL_CREATE_INDEX.format(table_name=self.table_name))
             redis_client.set(collection_exist_cache_key, 1, ex=3600)

api/docker/entrypoint.sh

@@ -71,14 +71,16 @@ elif [[ "${MODE}" == "beat" ]]; then
   exec celery -A app.celery beat --loglevel ${LOG_LEVEL:-INFO}
 else
   if [[ "${DEBUG}" == "true" ]]; then
-    exec flask run --host=${DIFY_BIND_ADDRESS:-0.0.0.0} --port=${DIFY_PORT:-5001} --debug
+    export HOST=${DIFY_BIND_ADDRESS:-0.0.0.0}
+    export PORT=${DIFY_PORT:-5001}
+    exec python -m app
   else
     exec gunicorn \
       --bind "${DIFY_BIND_ADDRESS:-0.0.0.0}:${DIFY_PORT:-5001}" \
       --workers ${SERVER_WORKER_AMOUNT:-1} \
-      --worker-class ${SERVER_WORKER_CLASS:-gevent} \
+      --worker-class ${SERVER_WORKER_CLASS:-geventwebsocket.gunicorn.workers.GeventWebSocketWorker} \
       --worker-connections ${SERVER_WORKER_CONNECTIONS:-10} \
       --timeout ${GUNICORN_TIMEOUT:-200} \
-      app:app
+      app:socketio_app
   fi
 fi

api/extensions/ext_socketio.py

@@ -0,0 +1,3 @@
+import socketio
+
+sio = socketio.Server(async_mode="gevent", cors_allowed_origins="*")

api/fields/online_user_fields.py

@@ -0,0 +1,17 @@
+from flask_restx import fields
+
+online_user_partial_fields = {
+    "user_id": fields.String,
+    "username": fields.String,
+    "avatar": fields.String,
+    "sid": fields.String,
+}
+
+workflow_online_users_fields = {
+    "workflow_id": fields.String,
+    "users": fields.List(fields.Nested(online_user_partial_fields)),
+}
+
+online_user_list_fields = {
+    "data": fields.List(fields.Nested(workflow_online_users_fields)),
+}

api/fields/workflow_comment_fields.py

@@ -0,0 +1,96 @@
+from flask_restx import fields
+
+from libs.helper import AvatarUrlField, TimestampField
+
+# basic account fields for comments
+account_fields = {
+    "id": fields.String,
+    "name": fields.String,
+    "email": fields.String,
+    "avatar_url": AvatarUrlField,
+}
+
+# Comment mention fields
+workflow_comment_mention_fields = {
+    "mentioned_user_id": fields.String,
+    "mentioned_user_account": fields.Nested(account_fields, allow_null=True),
+    "reply_id": fields.String,
+}
+
+# Comment reply fields
+workflow_comment_reply_fields = {
+    "id": fields.String,
+    "content": fields.String,
+    "created_by": fields.String,
+    "created_by_account": fields.Nested(account_fields, allow_null=True),
+    "created_at": TimestampField,
+}
+
+# Basic comment fields (for list views)
+workflow_comment_basic_fields = {
+    "id": fields.String,
+    "position_x": fields.Float,
+    "position_y": fields.Float,
+    "content": fields.String,
+    "created_by": fields.String,
+    "created_by_account": fields.Nested(account_fields, allow_null=True),
+    "created_at": TimestampField,
+    "updated_at": TimestampField,
+    "resolved": fields.Boolean,
+    "resolved_at": TimestampField,
+    "resolved_by": fields.String,
+    "resolved_by_account": fields.Nested(account_fields, allow_null=True),
+    "reply_count": fields.Integer,
+    "mention_count": fields.Integer,
+    "participants": fields.List(fields.Nested(account_fields)),
+}
+
+# Detailed comment fields (for single comment view)
+workflow_comment_detail_fields = {
+    "id": fields.String,
+    "position_x": fields.Float,
+    "position_y": fields.Float,
+    "content": fields.String,
+    "created_by": fields.String,
+    "created_by_account": fields.Nested(account_fields, allow_null=True),
+    "created_at": TimestampField,
+    "updated_at": TimestampField,
+    "resolved": fields.Boolean,
+    "resolved_at": TimestampField,
+    "resolved_by": fields.String,
+    "resolved_by_account": fields.Nested(account_fields, allow_null=True),
+    "replies": fields.List(fields.Nested(workflow_comment_reply_fields)),
+    "mentions": fields.List(fields.Nested(workflow_comment_mention_fields)),
+}
+
+# Comment creation response fields (simplified)
+workflow_comment_create_fields = {
+    "id": fields.String,
+    "created_at": TimestampField,
+}
+
+# Comment update response fields (simplified)
+workflow_comment_update_fields = {
+    "id": fields.String,
+    "updated_at": TimestampField,
+}
+
+# Comment resolve response fields
+workflow_comment_resolve_fields = {
+    "id": fields.String,
+    "resolved": fields.Boolean,
+    "resolved_at": TimestampField,
+    "resolved_by": fields.String,
+}
+
+# Reply creation response fields (simplified)
+workflow_comment_reply_create_fields = {
+    "id": fields.String,
+    "created_at": TimestampField,
+}
+
+# Reply update response fields
+workflow_comment_reply_update_fields = {
+    "id": fields.String,
+    "updated_at": TimestampField,
+}

api/migrations/versions/2025_09_18_1726-227822d22895_add_workflow_comments_table.py

@@ -0,0 +1,90 @@
+"""Add workflow comments table
+
+Revision ID: 227822d22895
+Revises: 68519ad5cd18
+Create Date: 2025-08-22 17:26:15.255980
+
+"""
+from alembic import op
+import models as models
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = '227822d22895'
+down_revision = '68519ad5cd18'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table('workflow_comments',
+    sa.Column('id', models.types.StringUUID(), server_default=sa.text('uuid_generate_v4()'), nullable=False),
+    sa.Column('tenant_id', models.types.StringUUID(), nullable=False),
+    sa.Column('app_id', models.types.StringUUID(), nullable=False),
+    sa.Column('position_x', sa.Float(), nullable=False),
+    sa.Column('position_y', sa.Float(), nullable=False),
+    sa.Column('content', sa.Text(), nullable=False),
+    sa.Column('created_by', models.types.StringUUID(), nullable=False),
+    sa.Column('created_at', sa.DateTime(), server_default=sa.text('CURRENT_TIMESTAMP'), nullable=False),
+    sa.Column('updated_at', sa.DateTime(), server_default=sa.text('CURRENT_TIMESTAMP'), nullable=False),
+    sa.Column('resolved', sa.Boolean(), server_default=sa.text('false'), nullable=False),
+    sa.Column('resolved_at', sa.DateTime(), nullable=True),
+    sa.Column('resolved_by', models.types.StringUUID(), nullable=True),
+    sa.PrimaryKeyConstraint('id', name='workflow_comments_pkey')
+    )
+    with op.batch_alter_table('workflow_comments', schema=None) as batch_op:
+        batch_op.create_index('workflow_comments_app_idx', ['tenant_id', 'app_id'], unique=False)
+        batch_op.create_index('workflow_comments_created_at_idx', ['created_at'], unique=False)
+
+    op.create_table('workflow_comment_replies',
+    sa.Column('id', models.types.StringUUID(), server_default=sa.text('uuid_generate_v4()'), nullable=False),
+    sa.Column('comment_id', models.types.StringUUID(), nullable=False),
+    sa.Column('content', sa.Text(), nullable=False),
+    sa.Column('created_by', models.types.StringUUID(), nullable=False),
+    sa.Column('created_at', sa.DateTime(), server_default=sa.text('CURRENT_TIMESTAMP'), nullable=False),
+    sa.Column('updated_at', sa.DateTime(), server_default=sa.text('CURRENT_TIMESTAMP'), nullable=False),
+    sa.ForeignKeyConstraint(['comment_id'], ['workflow_comments.id'], name=op.f('workflow_comment_replies_comment_id_fkey'), ondelete='CASCADE'),
+    sa.PrimaryKeyConstraint('id', name='workflow_comment_replies_pkey')
+    )
+    with op.batch_alter_table('workflow_comment_replies', schema=None) as batch_op:
+        batch_op.create_index('comment_replies_comment_idx', ['comment_id'], unique=False)
+        batch_op.create_index('comment_replies_created_at_idx', ['created_at'], unique=False)
+
+    op.create_table('workflow_comment_mentions',
+    sa.Column('id', models.types.StringUUID(), server_default=sa.text('uuid_generate_v4()'), nullable=False),
+    sa.Column('comment_id', models.types.StringUUID(), nullable=False),
+    sa.Column('reply_id', models.types.StringUUID(), nullable=True),
+    sa.Column('mentioned_user_id', models.types.StringUUID(), nullable=False),
+    sa.ForeignKeyConstraint(['comment_id'], ['workflow_comments.id'], name=op.f('workflow_comment_mentions_comment_id_fkey'), ondelete='CASCADE'),
+    sa.ForeignKeyConstraint(['reply_id'], ['workflow_comment_replies.id'], name=op.f('workflow_comment_mentions_reply_id_fkey'), ondelete='CASCADE'),
+    sa.PrimaryKeyConstraint('id', name='workflow_comment_mentions_pkey')
+    )
+    with op.batch_alter_table('workflow_comment_mentions', schema=None) as batch_op:
+        batch_op.create_index('comment_mentions_comment_idx', ['comment_id'], unique=False)
+        batch_op.create_index('comment_mentions_reply_idx', ['reply_id'], unique=False)
+        batch_op.create_index('comment_mentions_user_idx', ['mentioned_user_id'], unique=False)
+
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    with op.batch_alter_table('workflow_comment_mentions', schema=None) as batch_op:
+        batch_op.drop_index('comment_mentions_user_idx')
+        batch_op.drop_index('comment_mentions_reply_idx')
+        batch_op.drop_index('comment_mentions_comment_idx')
+
+    op.drop_table('workflow_comment_mentions')
+    with op.batch_alter_table('workflow_comment_replies', schema=None) as batch_op:
+        batch_op.drop_index('comment_replies_created_at_idx')
+        batch_op.drop_index('comment_replies_comment_idx')
+
+    op.drop_table('workflow_comment_replies')
+    with op.batch_alter_table('workflow_comments', schema=None) as batch_op:
+        batch_op.drop_index('workflow_comments_created_at_idx')
+        batch_op.drop_index('workflow_comments_app_idx')
+
+    op.drop_table('workflow_comments')
+    # ### end Alembic commands ###

api/models/__init__.py

@@ -9,6 +9,11 @@ from .account import (
     TenantStatus,
 )
 from .api_based_extension import APIBasedExtension, APIBasedExtensionPoint
+from .comment import (
+    WorkflowComment,
+    WorkflowCommentMention,
+    WorkflowCommentReply,
+)
 from .dataset import (
     AppDatasetJoin,
     Dataset,
@@ -195,6 +200,9 @@ __all__ = [
     "Workflow",
     "WorkflowAppLog",
     "WorkflowAppLogCreatedFrom",
+    "WorkflowComment",
+    "WorkflowCommentMention",
+    "WorkflowCommentReply",
     "WorkflowNodeExecutionModel",
     "WorkflowNodeExecutionOffload",
     "WorkflowNodeExecutionTriggeredFrom",

api/models/comment.py

@@ -0,0 +1,189 @@
+"""Workflow comment models."""
+
+from datetime import datetime
+from typing import TYPE_CHECKING, Optional
+
+from sqlalchemy import Index, func
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from .account import Account
+from .base import Base
+from .engine import db
+from .types import StringUUID
+
+if TYPE_CHECKING:
+    pass
+
+
+class WorkflowComment(Base):
+    """Workflow comment model for canvas commenting functionality.
+
+    Comments are associated with apps rather than specific workflow versions,
+    since an app has only one draft workflow at a time and comments should persist
+    across workflow version changes.
+
+    Attributes:
+        id: Comment ID
+        tenant_id: Workspace ID
+        app_id: App ID (primary association, comments belong to apps)
+        position_x: X coordinate on canvas
+        position_y: Y coordinate on canvas
+        content: Comment content
+        created_by: Creator account ID
+        created_at: Creation time
+        updated_at: Last update time
+        resolved: Whether comment is resolved
+        resolved_at: Resolution time
+        resolved_by: Resolver account ID
+    """
+
+    __tablename__ = "workflow_comments"
+    __table_args__ = (
+        db.PrimaryKeyConstraint("id", name="workflow_comments_pkey"),
+        Index("workflow_comments_app_idx", "tenant_id", "app_id"),
+        Index("workflow_comments_created_at_idx", "created_at"),
+    )
+
+    id: Mapped[str] = mapped_column(StringUUID, server_default=db.text("uuid_generate_v4()"))
+    tenant_id: Mapped[str] = mapped_column(StringUUID, nullable=False)
+    app_id: Mapped[str] = mapped_column(StringUUID, nullable=False)
+    position_x: Mapped[float] = mapped_column(db.Float)
+    position_y: Mapped[float] = mapped_column(db.Float)
+    content: Mapped[str] = mapped_column(db.Text, nullable=False)
+    created_by: Mapped[str] = mapped_column(StringUUID, nullable=False)
+    created_at: Mapped[datetime] = mapped_column(db.DateTime, nullable=False, server_default=func.current_timestamp())
+    updated_at: Mapped[datetime] = mapped_column(
+        db.DateTime, nullable=False, server_default=func.current_timestamp(), onupdate=func.current_timestamp()
+    )
+    resolved: Mapped[bool] = mapped_column(db.Boolean, nullable=False, server_default=db.text("false"))
+    resolved_at: Mapped[Optional[datetime]] = mapped_column(db.DateTime)
+    resolved_by: Mapped[Optional[str]] = mapped_column(StringUUID)
+
+    # Relationships
+    replies: Mapped[list["WorkflowCommentReply"]] = relationship(
+        "WorkflowCommentReply", back_populates="comment", cascade="all, delete-orphan"
+    )
+    mentions: Mapped[list["WorkflowCommentMention"]] = relationship(
+        "WorkflowCommentMention", back_populates="comment", cascade="all, delete-orphan"
+    )
+
+    @property
+    def created_by_account(self):
+        """Get creator account."""
+        return db.session.get(Account, self.created_by)
+
+    @property
+    def resolved_by_account(self):
+        """Get resolver account."""
+        if self.resolved_by:
+            return db.session.get(Account, self.resolved_by)
+        return None
+
+    @property
+    def reply_count(self):
+        """Get reply count."""
+        return len(self.replies)
+
+    @property
+    def mention_count(self):
+        """Get mention count."""
+        return len(self.mentions)
+
+    @property
+    def participants(self):
+        """Get all participants (creator + repliers + mentioned users)."""
+        participant_ids = set()
+
+        # Add comment creator
+        participant_ids.add(self.created_by)
+
+        # Add reply creators
+        participant_ids.update(reply.created_by for reply in self.replies)
+
+        # Add mentioned users
+        participant_ids.update(mention.mentioned_user_id for mention in self.mentions)
+
+        # Get account objects
+        participants = []
+        for user_id in participant_ids:
+            account = db.session.get(Account, user_id)
+            if account:
+                participants.append(account)
+
+        return participants
+
+
+class WorkflowCommentReply(Base):
+    """Workflow comment reply model.
+
+    Attributes:
+        id: Reply ID
+        comment_id: Parent comment ID
+        content: Reply content
+        created_by: Creator account ID
+        created_at: Creation time
+    """
+
+    __tablename__ = "workflow_comment_replies"
+    __table_args__ = (
+        db.PrimaryKeyConstraint("id", name="workflow_comment_replies_pkey"),
+        Index("comment_replies_comment_idx", "comment_id"),
+        Index("comment_replies_created_at_idx", "created_at"),
+    )
+
+    id: Mapped[str] = mapped_column(StringUUID, server_default=db.text("uuid_generate_v4()"))
+    comment_id: Mapped[str] = mapped_column(
+        StringUUID, db.ForeignKey("workflow_comments.id", ondelete="CASCADE"), nullable=False
+    )
+    content: Mapped[str] = mapped_column(db.Text, nullable=False)
+    created_by: Mapped[str] = mapped_column(StringUUID, nullable=False)
+    created_at: Mapped[datetime] = mapped_column(db.DateTime, nullable=False, server_default=func.current_timestamp())
+    updated_at: Mapped[datetime] = mapped_column(
+        db.DateTime, nullable=False, server_default=func.current_timestamp(), onupdate=func.current_timestamp()
+    )
+    # Relationships
+    comment: Mapped["WorkflowComment"] = relationship("WorkflowComment", back_populates="replies")
+
+    @property
+    def created_by_account(self):
+        """Get creator account."""
+        return db.session.get(Account, self.created_by)
+
+
+class WorkflowCommentMention(Base):
+    """Workflow comment mention model.
+
+    Mentions are only for internal accounts since end users
+    cannot access workflow canvas and commenting features.
+
+    Attributes:
+        id: Mention ID
+        comment_id: Parent comment ID
+        mentioned_user_id: Mentioned account ID
+    """
+
+    __tablename__ = "workflow_comment_mentions"
+    __table_args__ = (
+        db.PrimaryKeyConstraint("id", name="workflow_comment_mentions_pkey"),
+        Index("comment_mentions_comment_idx", "comment_id"),
+        Index("comment_mentions_reply_idx", "reply_id"),
+        Index("comment_mentions_user_idx", "mentioned_user_id"),
+    )
+
+    id: Mapped[str] = mapped_column(StringUUID, server_default=db.text("uuid_generate_v4()"))
+    comment_id: Mapped[str] = mapped_column(
+        StringUUID, db.ForeignKey("workflow_comments.id", ondelete="CASCADE"), nullable=False
+    )
+    reply_id: Mapped[Optional[str]] = mapped_column(
+        StringUUID, db.ForeignKey("workflow_comment_replies.id", ondelete="CASCADE"), nullable=True
+    )
+    mentioned_user_id: Mapped[str] = mapped_column(StringUUID, nullable=False)
+
+    # Relationships
+    comment: Mapped["WorkflowComment"] = relationship("WorkflowComment", back_populates="mentions")
+    reply: Mapped[Optional["WorkflowCommentReply"]] = relationship("WorkflowCommentReply")
+
+    @property
+    def mentioned_user_account(self):
+        """Get mentioned account."""
+        return db.session.get(Account, self.mentioned_user_id)

api/models/workflow.py

@@ -392,7 +392,7 @@ class Workflow(Base):
 
         :return: hash
         """
-        entity = {"graph": self.graph_dict, "features": self.features_dict}
+        entity = {"graph": self.graph_dict}
 
         return helper.generate_text_hash(json.dumps(entity, sort_keys=True))
 

api/pyproject.toml

@@ -20,6 +20,7 @@ dependencies = [
     "flask-orjson~=2.0.0",
     "flask-sqlalchemy~=3.1.1",
     "gevent~=25.9.1",
+    "gevent-websocket~=0.10.1",
     "gmpy2~=2.2.1",
     "google-api-core==2.18.0",
     "google-api-python-client==2.90.0",
@@ -69,6 +70,7 @@ dependencies = [
     "pypdfium2==4.30.0",
     "python-docx~=1.1.0",
     "python-dotenv==1.0.1",
+    "python-socketio~=5.13.0",
     "pyyaml~=6.0.1",
     "readabilipy~=0.3.0",
     "redis[hiredis]~=6.1.0",

api/services/feature_service.py

@@ -152,6 +152,7 @@ class SystemFeatureModel(BaseModel):
     enable_email_code_login: bool = False
     enable_email_password_login: bool = True
     enable_social_oauth_login: bool = False
+    enable_collaboration_mode: bool = False
     is_allow_register: bool = False
     is_allow_create_workspace: bool = False
     is_email_setup: bool = False
@@ -213,6 +214,7 @@ class FeatureService:
         system_features.enable_email_code_login = dify_config.ENABLE_EMAIL_CODE_LOGIN
         system_features.enable_email_password_login = dify_config.ENABLE_EMAIL_PASSWORD_LOGIN
         system_features.enable_social_oauth_login = dify_config.ENABLE_SOCIAL_OAUTH_LOGIN
+        system_features.enable_collaboration_mode = dify_config.ENABLE_COLLABORATION_MODE
         system_features.is_allow_register = dify_config.ALLOW_REGISTER
         system_features.is_allow_create_workspace = dify_config.ALLOW_CREATE_WORKSPACE
         system_features.is_email_setup = dify_config.MAIL_TYPE is not None and dify_config.MAIL_TYPE != ""

api/services/workflow_comment_service.py

@@ -0,0 +1,311 @@
+import logging
+from typing import Optional
+
+from sqlalchemy import desc, select
+from sqlalchemy.orm import Session, selectinload
+from werkzeug.exceptions import Forbidden, NotFound
+
+from extensions.ext_database import db
+from libs.datetime_utils import naive_utc_now
+from libs.helper import uuid_value
+from models import WorkflowComment, WorkflowCommentMention, WorkflowCommentReply
+
+logger = logging.getLogger(__name__)
+
+
+class WorkflowCommentService:
+    """Service for managing workflow comments."""
+
+    @staticmethod
+    def _validate_content(content: str) -> None:
+        if len(content.strip()) == 0:
+            raise ValueError("Comment content cannot be empty")
+
+        if len(content) > 1000:
+            raise ValueError("Comment content cannot exceed 1000 characters")
+
+    @staticmethod
+    def get_comments(tenant_id: str, app_id: str) -> list[WorkflowComment]:
+        """Get all comments for a workflow."""
+        with Session(db.engine) as session:
+            # Get all comments with eager loading
+            stmt = (
+                select(WorkflowComment)
+                .options(selectinload(WorkflowComment.replies), selectinload(WorkflowComment.mentions))
+                .where(WorkflowComment.tenant_id == tenant_id, WorkflowComment.app_id == app_id)
+                .order_by(desc(WorkflowComment.created_at))
+            )
+
+            comments = session.scalars(stmt).all()
+            return comments
+
+    @staticmethod
+    def get_comment(tenant_id: str, app_id: str, comment_id: str, session: Session = None) -> WorkflowComment:
+        """Get a specific comment."""
+
+        def _get_comment(session: Session) -> WorkflowComment:
+            stmt = (
+                select(WorkflowComment)
+                .options(selectinload(WorkflowComment.replies), selectinload(WorkflowComment.mentions))
+                .where(
+                    WorkflowComment.id == comment_id,
+                    WorkflowComment.tenant_id == tenant_id,
+                    WorkflowComment.app_id == app_id,
+                )
+            )
+            comment = session.scalar(stmt)
+
+            if not comment:
+                raise NotFound("Comment not found")
+
+            return comment
+
+        if session is not None:
+            return _get_comment(session)
+        else:
+            with Session(db.engine, expire_on_commit=False) as session:
+                return _get_comment(session)
+
+    @staticmethod
+    def create_comment(
+        tenant_id: str,
+        app_id: str,
+        created_by: str,
+        content: str,
+        position_x: float,
+        position_y: float,
+        mentioned_user_ids: Optional[list[str]] = None,
+    ) -> WorkflowComment:
+        """Create a new workflow comment."""
+        WorkflowCommentService._validate_content(content)
+
+        with Session(db.engine) as session:
+            comment = WorkflowComment(
+                tenant_id=tenant_id,
+                app_id=app_id,
+                position_x=position_x,
+                position_y=position_y,
+                content=content,
+                created_by=created_by,
+            )
+
+            session.add(comment)
+            session.flush()  # Get the comment ID for mentions
+
+            # Create mentions if specified
+            mentioned_user_ids = mentioned_user_ids or []
+            for user_id in mentioned_user_ids:
+                if isinstance(user_id, str) and uuid_value(user_id):
+                    mention = WorkflowCommentMention(
+                        comment_id=comment.id,
+                        reply_id=None,  # This is a comment mention, not reply mention
+                        mentioned_user_id=user_id,
+                    )
+                    session.add(mention)
+
+            session.commit()
+
+            # Return only what we need - id and created_at
+            return {"id": comment.id, "created_at": comment.created_at}
+
+    @staticmethod
+    def update_comment(
+        tenant_id: str,
+        app_id: str,
+        comment_id: str,
+        user_id: str,
+        content: str,
+        position_x: Optional[float] = None,
+        position_y: Optional[float] = None,
+        mentioned_user_ids: Optional[list[str]] = None,
+    ) -> dict:
+        """Update a workflow comment."""
+        WorkflowCommentService._validate_content(content)
+
+        with Session(db.engine, expire_on_commit=False) as session:
+            # Get comment with validation
+            stmt = select(WorkflowComment).where(
+                WorkflowComment.id == comment_id,
+                WorkflowComment.tenant_id == tenant_id,
+                WorkflowComment.app_id == app_id,
+            )
+            comment = session.scalar(stmt)
+
+            if not comment:
+                raise NotFound("Comment not found")
+
+            # Only the creator can update the comment
+            if comment.created_by != user_id:
+                raise Forbidden("Only the comment creator can update it")
+
+            # Update comment fields
+            comment.content = content
+            if position_x is not None:
+                comment.position_x = position_x
+            if position_y is not None:
+                comment.position_y = position_y
+
+            # Update mentions - first remove existing mentions for this comment only (not replies)
+            existing_mentions = session.scalars(
+                select(WorkflowCommentMention).where(
+                    WorkflowCommentMention.comment_id == comment.id,
+                    WorkflowCommentMention.reply_id.is_(None),  # Only comment mentions, not reply mentions
+                )
+            ).all()
+            for mention in existing_mentions:
+                session.delete(mention)
+
+            # Add new mentions
+            mentioned_user_ids = mentioned_user_ids or []
+            for user_id_str in mentioned_user_ids:
+                if isinstance(user_id_str, str) and uuid_value(user_id_str):
+                    mention = WorkflowCommentMention(
+                        comment_id=comment.id,
+                        reply_id=None,  # This is a comment mention
+                        mentioned_user_id=user_id_str,
+                    )
+                    session.add(mention)
+
+            session.commit()
+
+            return {"id": comment.id, "updated_at": comment.updated_at}
+
+    @staticmethod
+    def delete_comment(tenant_id: str, app_id: str, comment_id: str, user_id: str) -> None:
+        """Delete a workflow comment."""
+        with Session(db.engine, expire_on_commit=False) as session:
+            comment = WorkflowCommentService.get_comment(tenant_id, app_id, comment_id, session)
+
+            # Only the creator can delete the comment
+            if comment.created_by != user_id:
+                raise Forbidden("Only the comment creator can delete it")
+
+            # Delete associated mentions (both comment and reply mentions)
+            mentions = session.scalars(
+                select(WorkflowCommentMention).where(WorkflowCommentMention.comment_id == comment_id)
+            ).all()
+            for mention in mentions:
+                session.delete(mention)
+
+            # Delete associated replies
+            replies = session.scalars(
+                select(WorkflowCommentReply).where(WorkflowCommentReply.comment_id == comment_id)
+            ).all()
+            for reply in replies:
+                session.delete(reply)
+
+            session.delete(comment)
+            session.commit()
+
+    @staticmethod
+    def resolve_comment(tenant_id: str, app_id: str, comment_id: str, user_id: str) -> WorkflowComment:
+        """Resolve a workflow comment."""
+        with Session(db.engine, expire_on_commit=False) as session:
+            comment = WorkflowCommentService.get_comment(tenant_id, app_id, comment_id, session)
+            if comment.resolved:
+                return comment
+
+            comment.resolved = True
+            comment.resolved_at = naive_utc_now()
+            comment.resolved_by = user_id
+            session.commit()
+
+        return comment
+
+    @staticmethod
+    def create_reply(
+        comment_id: str, content: str, created_by: str, mentioned_user_ids: Optional[list[str]] = None
+    ) -> dict:
+        """Add a reply to a workflow comment."""
+        WorkflowCommentService._validate_content(content)
+
+        with Session(db.engine, expire_on_commit=False) as session:
+            # Check if comment exists
+            comment = session.get(WorkflowComment, comment_id)
+            if not comment:
+                raise NotFound("Comment not found")
+
+            reply = WorkflowCommentReply(comment_id=comment_id, content=content, created_by=created_by)
+
+            session.add(reply)
+            session.flush()  # Get the reply ID for mentions
+
+            # Create mentions if specified
+            mentioned_user_ids = mentioned_user_ids or []
+            for user_id in mentioned_user_ids:
+                if isinstance(user_id, str) and uuid_value(user_id):
+                    # Create mention linking to specific reply
+                    mention = WorkflowCommentMention(
+                        comment_id=comment_id, reply_id=reply.id, mentioned_user_id=user_id
+                    )
+                    session.add(mention)
+
+            session.commit()
+
+            return {"id": reply.id, "created_at": reply.created_at}
+
+    @staticmethod
+    def update_reply(
+        reply_id: str, user_id: str, content: str, mentioned_user_ids: Optional[list[str]] = None
+    ) -> WorkflowCommentReply:
+        """Update a comment reply."""
+        WorkflowCommentService._validate_content(content)
+
+        with Session(db.engine, expire_on_commit=False) as session:
+            reply = session.get(WorkflowCommentReply, reply_id)
+            if not reply:
+                raise NotFound("Reply not found")
+
+            # Only the creator can update the reply
+            if reply.created_by != user_id:
+                raise Forbidden("Only the reply creator can update it")
+
+            reply.content = content
+
+            # Update mentions - first remove existing mentions for this reply
+            existing_mentions = session.scalars(
+                select(WorkflowCommentMention).where(WorkflowCommentMention.reply_id == reply.id)
+            ).all()
+            for mention in existing_mentions:
+                session.delete(mention)
+
+            # Add mentions
+            mentioned_user_ids = mentioned_user_ids or []
+            for user_id_str in mentioned_user_ids:
+                if isinstance(user_id_str, str) and uuid_value(user_id_str):
+                    mention = WorkflowCommentMention(
+                        comment_id=reply.comment_id, reply_id=reply.id, mentioned_user_id=user_id_str
+                    )
+                    session.add(mention)
+
+            session.commit()
+            session.refresh(reply)  # Refresh to get updated timestamp
+
+            return {"id": reply.id, "updated_at": reply.updated_at}
+
+    @staticmethod
+    def delete_reply(reply_id: str, user_id: str) -> None:
+        """Delete a comment reply."""
+        with Session(db.engine, expire_on_commit=False) as session:
+            reply = session.get(WorkflowCommentReply, reply_id)
+            if not reply:
+                raise NotFound("Reply not found")
+
+            # Only the creator can delete the reply
+            if reply.created_by != user_id:
+                raise Forbidden("Only the reply creator can delete it")
+
+            # Delete associated mentions first
+            mentions = session.scalars(
+                select(WorkflowCommentMention).where(WorkflowCommentMention.reply_id == reply_id)
+            ).all()
+            for mention in mentions:
+                session.delete(mention)
+
+            session.delete(reply)
+            session.commit()
+
+    @staticmethod
+    def validate_comment_access(comment_id: str, tenant_id: str, app_id: str) -> WorkflowComment:
+        """Validate that a comment belongs to the specified tenant and app."""
+        return WorkflowCommentService.get_comment(tenant_id, app_id, comment_id)

api/services/workflow_service.py

@@ -200,15 +200,17 @@ class WorkflowService:
         account: Account,
         environment_variables: Sequence[Variable],
         conversation_variables: Sequence[Variable],
+        force_upload: bool = False,
     ) -> Workflow:
         """
         Sync draft workflow
+        :param force_upload: Skip hash validation when True (for restore operations)
         :raises WorkflowHashNotEqualError
         """
         # fetch draft workflow by app_model
         workflow = self.get_draft_workflow(app_model=app_model)
 
-        if workflow and workflow.unique_hash != unique_hash:
+        if workflow and workflow.unique_hash != unique_hash and not force_upload:
             raise WorkflowHashNotEqualError()
 
         # validate features structure
@@ -249,6 +251,78 @@ class WorkflowService:
         # return draft workflow
         return workflow
 
+    def update_draft_workflow_environment_variables(
+        self,
+        *,
+        app_model: App,
+        environment_variables: Sequence[Variable],
+        account: Account,
+    ):
+        """
+        Update draft workflow environment variables
+        """
+        # fetch draft workflow by app_model
+        workflow = self.get_draft_workflow(app_model=app_model)
+
+        if not workflow:
+            raise ValueError("No draft workflow found.")
+
+        workflow.environment_variables = environment_variables
+        workflow.updated_by = account.id
+        workflow.updated_at = naive_utc_now()
+
+        # commit db session changes
+        db.session.commit()
+
+    def update_draft_workflow_conversation_variables(
+        self,
+        *,
+        app_model: App,
+        conversation_variables: Sequence[Variable],
+        account: Account,
+    ):
+        """
+        Update draft workflow conversation variables
+        """
+        # fetch draft workflow by app_model
+        workflow = self.get_draft_workflow(app_model=app_model)
+
+        if not workflow:
+            raise ValueError("No draft workflow found.")
+
+        workflow.conversation_variables = conversation_variables
+        workflow.updated_by = account.id
+        workflow.updated_at = naive_utc_now()
+
+        # commit db session changes
+        db.session.commit()
+
+    def update_draft_workflow_features(
+        self,
+        *,
+        app_model: App,
+        features: dict,
+        account: Account,
+    ):
+        """
+        Update draft workflow features
+        """
+        # fetch draft workflow by app_model
+        workflow = self.get_draft_workflow(app_model=app_model)
+
+        if not workflow:
+            raise ValueError("No draft workflow found.")
+
+        # validate features structure
+        self.validate_features_structure(app_model=app_model, features=features)
+
+        workflow.features = json.dumps(features)
+        workflow.updated_by = account.id
+        workflow.updated_at = naive_utc_now()
+
+        # commit db session changes
+        db.session.commit()
+
     def publish_workflow(
         self,
         *,

api/tests/test_containers_integration_tests/services/test_feature_service.py

@@ -268,6 +268,7 @@ class TestFeatureService:
             mock_config.ENABLE_EMAIL_CODE_LOGIN = True
             mock_config.ENABLE_EMAIL_PASSWORD_LOGIN = True
             mock_config.ENABLE_SOCIAL_OAUTH_LOGIN = False
+            mock_config.ENABLE_COLLABORATION_MODE = True
             mock_config.ALLOW_REGISTER = False
             mock_config.ALLOW_CREATE_WORKSPACE = False
             mock_config.MAIL_TYPE = "smtp"
@@ -292,6 +293,7 @@ class TestFeatureService:
         # Verify authentication settings
         assert result.enable_email_code_login is True
         assert result.enable_email_password_login is False
+        assert result.enable_collaboration_mode is True
         assert result.is_allow_register is False
         assert result.is_allow_create_workspace is False
 
@@ -341,6 +343,7 @@ class TestFeatureService:
             mock_config.ENABLE_EMAIL_CODE_LOGIN = True
             mock_config.ENABLE_EMAIL_PASSWORD_LOGIN = True
             mock_config.ENABLE_SOCIAL_OAUTH_LOGIN = False
+            mock_config.ENABLE_COLLABORATION_MODE = False
             mock_config.ALLOW_REGISTER = True
             mock_config.ALLOW_CREATE_WORKSPACE = True
             mock_config.MAIL_TYPE = "smtp"
@@ -362,6 +365,7 @@ class TestFeatureService:
             assert result.enable_email_code_login is True
             assert result.enable_email_password_login is True
             assert result.enable_social_oauth_login is False
+            assert result.enable_collaboration_mode is False
             assert result.is_allow_register is True
             assert result.is_allow_create_workspace is True
             assert result.is_email_setup is True

api/uv.lock

@@ -562,6 +562,15 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/57/f4/a69c20ee4f660081a7dedb1ac57f29be9378e04edfcb90c526b923d4bebc/beautifulsoup4-4.12.2-py3-none-any.whl", hash = "sha256:bd2520ca0d9d7d12694a53d44ac482d181b4ec1888909b035a3dbf40d0f57d4a", size = 142979, upload-time = "2023-04-07T15:02:50.77Z" },
 ]
 
+[[package]]
+name = "bidict"
+version = "0.23.1"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/9a/6e/026678aa5a830e07cd9498a05d3e7e650a4f56a42f267a53d22bcda1bdc9/bidict-0.23.1.tar.gz", hash = "sha256:03069d763bc387bbd20e7d49914e75fc4132a41937fa3405417e1a5a2d006d71", size = 29093, upload-time = "2024-02-18T19:09:05.748Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/99/37/e8730c3587a65eb5645d4aba2d27aae48e8003614d6aaf15dda67f702f1f/bidict-0.23.1-py3-none-any.whl", hash = "sha256:5dae8d4d79b552a71cbabc7deb25dfe8ce710b17ff41711e13010ead2abfc3e5", size = 32764, upload-time = "2024-02-18T19:09:04.156Z" },
+]
+
 [[package]]
 name = "billiard"
 version = "4.2.2"
@@ -1322,6 +1331,7 @@ dependencies = [
     { name = "flask-restx" },
     { name = "flask-sqlalchemy" },
     { name = "gevent" },
+    { name = "gevent-websocket" },
     { name = "gmpy2" },
     { name = "google-api-core" },
     { name = "google-api-python-client" },
@@ -1370,6 +1380,7 @@ dependencies = [
     { name = "pypdfium2" },
     { name = "python-docx" },
     { name = "python-dotenv" },
+    { name = "python-socketio" },
     { name = "pyyaml" },
     { name = "readabilipy" },
     { name = "redis", extra = ["hiredis"] },
@@ -1516,6 +1527,7 @@ requires-dist = [
     { name = "flask-restx", specifier = "~=1.3.0" },
     { name = "flask-sqlalchemy", specifier = "~=3.1.1" },
     { name = "gevent", specifier = "~=25.9.1" },
+    { name = "gevent-websocket", specifier = "~=0.10.1" },
     { name = "gmpy2", specifier = "~=2.2.1" },
     { name = "google-api-core", specifier = "==2.18.0" },
     { name = "google-api-python-client", specifier = "==2.90.0" },
@@ -1564,6 +1576,7 @@ requires-dist = [
     { name = "pypdfium2", specifier = "==4.30.0" },
     { name = "python-docx", specifier = "~=1.1.0" },
     { name = "python-dotenv", specifier = "==1.0.1" },
+    { name = "python-socketio", specifier = "~=5.13.0" },
     { name = "pyyaml", specifier = "~=6.0.1" },
     { name = "readabilipy", specifier = "~=0.3.0" },
     { name = "redis", extras = ["hiredis"], specifier = "~=6.1.0" },
@@ -2119,6 +2132,18 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/d5/98/caf06d5d22a7c129c1fb2fc1477306902a2c8ddfd399cd26bbbd4caf2141/gevent-25.9.1-cp312-cp312-win_amd64.whl", hash = "sha256:4acd6bcd5feabf22c7c5174bd3b9535ee9f088d2bbce789f740ad8d6554b18f3", size = 1682837, upload-time = "2025-09-17T19:48:47.318Z" },
 ]
 
+[[package]]
+name = "gevent-websocket"
+version = "0.10.1"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "gevent" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/98/d2/6fa19239ff1ab072af40ebf339acd91fb97f34617c2ee625b8e34bf42393/gevent-websocket-0.10.1.tar.gz", hash = "sha256:7eaef32968290c9121f7c35b973e2cc302ffb076d018c9068d2f5ca8b2d85fb0", size = 18366, upload-time = "2017-03-12T22:46:05.68Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/7b/84/2dc373eb6493e00c884cc11e6c059ec97abae2678d42f06bf780570b0193/gevent_websocket-0.10.1-py3-none-any.whl", hash = "sha256:17b67d91282f8f4c973eba0551183fc84f56f1c90c8f6b6b30256f31f66f5242", size = 22987, upload-time = "2017-03-12T22:46:03.611Z" },
+]
+
 [[package]]
 name = "gitdb"
 version = "4.0.12"
@@ -5078,6 +5103,18 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/6a/3e/b68c118422ec867fa7ab88444e1274aa40681c606d59ac27de5a5588f082/python_dotenv-1.0.1-py3-none-any.whl", hash = "sha256:f7b63ef50f1b690dddf550d03497b66d609393b40b564ed0d674909a68ebf16a", size = 19863, upload-time = "2024-01-23T06:32:58.246Z" },
 ]
 
+[[package]]
+name = "python-engineio"
+version = "4.12.3"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "simple-websocket" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/c9/d8/63e5535ab21dc4998ba1cfe13690ccf122883a38f025dca24d6e56c05eba/python_engineio-4.12.3.tar.gz", hash = "sha256:35633e55ec30915e7fc8f7e34ca8d73ee0c080cec8a8cd04faf2d7396f0a7a7a", size = 91910, upload-time = "2025-09-28T06:31:36.765Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/d8/f0/c5aa0a69fd9326f013110653543f36ece4913c17921f3e1dbd78e1b423ee/python_engineio-4.12.3-py3-none-any.whl", hash = "sha256:7c099abb2a27ea7ab429c04da86ab2d82698cdd6c52406cb73766fe454feb7e1", size = 59637, upload-time = "2025-09-28T06:31:35.354Z" },
+]
+
 [[package]]
 name = "python-http-client"
 version = "3.3.7"
@@ -5134,6 +5171,19 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/d9/4f/00be2196329ebbff56ce564aa94efb0fbc828d00de250b1980de1a34ab49/python_pptx-1.0.2-py3-none-any.whl", hash = "sha256:160838e0b8565a8b1f67947675886e9fea18aa5e795db7ae531606d68e785cba", size = 472788, upload-time = "2024-08-07T17:33:28.192Z" },
 ]
 
+[[package]]
+name = "python-socketio"
+version = "5.13.0"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "bidict" },
+    { name = "python-engineio" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/21/1a/396d50ccf06ee539fa758ce5623b59a9cb27637fc4b2dc07ed08bf495e77/python_socketio-5.13.0.tar.gz", hash = "sha256:ac4e19a0302ae812e23b712ec8b6427ca0521f7c582d6abb096e36e24a263029", size = 121125, upload-time = "2025-04-12T15:46:59.933Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/3c/32/b4fb8585d1be0f68bde7e110dffbcf354915f77ad8c778563f0ad9655c02/python_socketio-5.13.0-py3-none-any.whl", hash = "sha256:51f68d6499f2df8524668c24bcec13ba1414117cfb3a90115c559b601ab10caf", size = 77800, upload-time = "2025-04-12T15:46:58.412Z" },
+]
+
 [[package]]
 name = "pytz"
 version = "2025.2"
@@ -5639,6 +5689,18 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/e0/f9/0595336914c5619e5f28a1fb793285925a8cd4b432c9da0a987836c7f822/shellingham-1.5.4-py2.py3-none-any.whl", hash = "sha256:7ecfff8f2fd72616f7481040475a65b2bf8af90a56c89140852d1120324e8686", size = 9755, upload-time = "2023-10-24T04:13:38.866Z" },
 ]
 
+[[package]]
+name = "simple-websocket"
+version = "1.1.0"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "wsproto" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/b0/d4/bfa032f961103eba93de583b161f0e6a5b63cebb8f2c7d0c6e6efe1e3d2e/simple_websocket-1.1.0.tar.gz", hash = "sha256:7939234e7aa067c534abdab3a9ed933ec9ce4691b0713c78acb195560aa52ae4", size = 17300, upload-time = "2024-10-10T22:39:31.412Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/52/59/0782e51887ac6b07ffd1570e0364cf901ebc36345fea669969d2084baebb/simple_websocket-1.1.0-py3-none-any.whl", hash = "sha256:4af6069630a38ed6c561010f0e11a5bc0d4ca569b36306eb257cd9a192497c8c", size = 13842, upload-time = "2024-10-10T22:39:29.645Z" },
+]
+
 [[package]]
 name = "six"
 version = "1.17.0"
@@ -7038,6 +7100,18 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/1f/f6/a933bd70f98e9cf3e08167fc5cd7aaaca49147e48411c0bd5ae701bb2194/wrapt-1.17.3-py3-none-any.whl", hash = "sha256:7171ae35d2c33d326ac19dd8facb1e82e5fd04ef8c6c0e394d7af55a55051c22", size = 23591, upload-time = "2025-08-12T05:53:20.674Z" },
 ]
 
+[[package]]
+name = "wsproto"
+version = "1.2.0"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "h11" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/c9/4a/44d3c295350d776427904d73c189e10aeae66d7f555bb2feee16d1e4ba5a/wsproto-1.2.0.tar.gz", hash = "sha256:ad565f26ecb92588a3e43bc3d96164de84cd9902482b130d0ddbaa9664a85065", size = 53425, upload-time = "2022-08-23T19:58:21.447Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/78/58/e860788190eba3bcce367f74d29c4675466ce8dddfba85f7827588416f01/wsproto-1.2.0-py3-none-any.whl", hash = "sha256:b9acddd652b585d75b20477888c56642fdade28bdfd3579aa24a4d2c037dd736", size = 24226, upload-time = "2022-08-23T19:58:19.96Z" },
+]
+
 [[package]]
 name = "xinference-client"
 version = "1.2.2"

docker/.env.example

@@ -127,6 +127,10 @@ MIGRATION_ENABLED=true
 # The default value is 300 seconds.
 FILES_ACCESS_TIMEOUT=300
 
+# Collaboration mode toggle
+# To open collaboration features, you also need to set SERVER_WORKER_CLASS=geventwebsocket.gunicorn.workers.GeventWebSocketWorker
+ENABLE_COLLABORATION_MODE=false
+
 # Access token expiration time in minutes
 ACCESS_TOKEN_EXPIRE_MINUTES=60
 
@@ -160,6 +164,7 @@ SERVER_WORKER_AMOUNT=1
 # Modifying it may also decrease throughput.
 #
 # It is strongly discouraged to change this parameter.
+# If enable collaboration mode, it must be set to geventwebsocket.gunicorn.workers.GeventWebSocketWorker
 SERVER_WORKER_CLASS=gevent
 
 # Default number of worker connections, the default is 10.

docker/nginx/conf.d/default.conf.template

@@ -14,6 +14,14 @@ server {
       include proxy.conf;
     }
 
+    location /socket.io/ {
+      proxy_pass http://api:5001;
+      include proxy.conf;
+      proxy_set_header Upgrade $http_upgrade;
+      proxy_set_header Connection "upgrade";
+      proxy_cache_bypass $http_upgrade;
+    }
+
     location /v1 {
       proxy_pass http://api:5001;
       include proxy.conf;

docker/nginx/proxy.conf.template

@@ -5,7 +5,7 @@ proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
 proxy_set_header X-Forwarded-Proto $scheme;
 proxy_set_header X-Forwarded-Port $server_port;
 proxy_http_version 1.1;
-proxy_set_header Connection "";
+# proxy_set_header Connection "";
 proxy_buffering off;
 proxy_read_timeout ${NGINX_PROXY_READ_TIMEOUT};
 proxy_send_timeout ${NGINX_PROXY_SEND_TIMEOUT};

web/app/(commonLayout)/app/(appDetailLayout)/[appId]/overview/card-view.tsx

@@ -1,6 +1,6 @@
 'use client'
 import type { FC } from 'react'
-import React, { useMemo } from 'react'
+import React, { useEffect, useMemo } from 'react'
 import { useTranslation } from 'react-i18next'
 import { useContext } from 'use-context-selector'
 import AppCard from '@/app/components/app/overview/app-card'
@@ -24,6 +24,8 @@ import { useStore as useAppStore } from '@/app/components/app/store'
 import { useAppWorkflow } from '@/service/use-workflow'
 import type { BlockEnum } from '@/app/components/workflow/types'
 import { isTriggerNode } from '@/app/components/workflow/types'
+import { webSocketClient } from '@/app/components/workflow/collaboration/core/websocket-manager'
+import { collaborationManager } from '@/app/components/workflow/collaboration/core/collaboration-manager'
 
 export type ICardViewProps = {
   appId: string
@@ -63,15 +65,44 @@ const CardView: FC<ICardViewProps> = ({ appId, isInPanel, className }) => {
 
     message ||= (type === 'success' ? 'modifiedSuccessfully' : 'modifiedUnsuccessfully')
 
-    if (type === 'success')
+    if (type === 'success') {
       updateAppDetail()
 
+      // Emit collaboration event to notify other clients of app state changes
+      const socket = webSocketClient.getSocket(appId)
+      if (socket) {
+        socket.emit('collaboration_event', {
+          type: 'app_state_update',
+          data: { timestamp: Date.now() },
+          timestamp: Date.now(),
+        })
+      }
+    }
+
     notify({
       type,
       message: t(`common.actionMsg.${message}`),
     })
   }
 
+  // Listen for collaborative app state updates from other clients
+  useEffect(() => {
+    if (!appId) return
+
+    const unsubscribe = collaborationManager.onAppStateUpdate(async (update: any) => {
+      try {
+        console.log('Received app state update from collaboration:', update)
+        // Update app detail when other clients modify app state
+        await updateAppDetail()
+      }
+      catch (error) {
+        console.error('app state update failed:', error)
+      }
+    })
+
+    return unsubscribe
+  }, [appId])
+
   const onChangeSiteStatus = async (value: boolean) => {
     const [err] = await asyncRunSafe<App>(
       updateAppSiteStatus({

web/app/components/app-sidebar/app-info.tsx

@@ -1,7 +1,7 @@
 import { useTranslation } from 'react-i18next'
 import { useRouter } from 'next/navigation'
 import { useContext } from 'use-context-selector'
-import React, { useCallback, useState } from 'react'
+import React, { useCallback, useEffect, useState } from 'react'
 import {
   RiDeleteBinLine,
   RiEditLine,
@@ -16,7 +16,7 @@ import { useStore as useAppStore } from '@/app/components/app/store'
 import { ToastContext } from '@/app/components/base/toast'
 import { useAppContext } from '@/context/app-context'
 import { useProviderContext } from '@/context/provider-context'
-import { copyApp, deleteApp, exportAppConfig, updateAppInfo } from '@/service/apps'
+import { copyApp, deleteApp, exportAppConfig, fetchAppDetail, updateAppInfo } from '@/service/apps'
 import type { DuplicateAppModalProps } from '@/app/components/app/duplicate-modal'
 import type { CreateAppModalProps } from '@/app/components/explore/create-app-modal'
 import { NEED_REFRESH_APP_LIST_KEY } from '@/config'
@@ -31,6 +31,8 @@ import AppOperations from './app-operations'
 import dynamic from 'next/dynamic'
 import cn from '@/utils/classnames'
 import { AppModeEnum } from '@/types/app'
+import { webSocketClient } from '@/app/components/workflow/collaboration/core/websocket-manager'
+import { collaborationManager } from '@/app/components/workflow/collaboration/core/collaboration-manager'
 
 const SwitchAppModal = dynamic(() => import('@/app/components/app/switch-app-modal'), {
   ssr: false,
@@ -74,6 +76,19 @@ const AppInfo = ({ expand, onlyShowDetail = false, openState = false, onDetailEx
   const [secretEnvList, setSecretEnvList] = useState<EnvironmentVariable[]>([])
   const [showExportWarning, setShowExportWarning] = useState(false)
 
+  const emitAppMetaUpdate = useCallback(() => {
+    if (!appDetail?.id)
+      return
+    const socket = webSocketClient.getSocket(appDetail.id)
+    if (socket) {
+      socket.emit('collaboration_event', {
+        type: 'app_meta_update',
+        data: { timestamp: Date.now() },
+        timestamp: Date.now(),
+      })
+    }
+  }, [appDetail?.id])
+
   const onEdit: CreateAppModalProps['onConfirm'] = useCallback(async ({
     name,
     icon_type,
@@ -102,11 +117,12 @@ const AppInfo = ({ expand, onlyShowDetail = false, openState = false, onDetailEx
         message: t('app.editDone'),
       })
       setAppDetail(app)
+      emitAppMetaUpdate()
     }
     catch {
       notify({ type: 'error', message: t('app.editFailed') })
     }
-  }, [appDetail, notify, setAppDetail, t])
+  }, [appDetail, notify, setAppDetail, t, emitAppMetaUpdate])
 
   const onCopy: DuplicateAppModalProps['onConfirm'] = async ({ name, icon_type, icon, icon_background }) => {
     if (!appDetail)
@@ -203,6 +219,23 @@ const AppInfo = ({ expand, onlyShowDetail = false, openState = false, onDetailEx
     setShowConfirmDelete(false)
   }, [appDetail, notify, onPlanInfoChanged, replace, setAppDetail, t])
 
+  useEffect(() => {
+    if (!appDetail?.id)
+      return
+
+    const unsubscribe = collaborationManager.onAppMetaUpdate(async () => {
+      try {
+        const res = await fetchAppDetail({ url: '/apps', id: appDetail.id })
+        setAppDetail({ ...res })
+      }
+      catch (error) {
+        console.error('failed to refresh app detail from collaboration update:', error)
+      }
+    })
+
+    return unsubscribe
+  }, [appDetail?.id, setAppDetail])
+
   const { isCurrentWorkspaceEditor } = useAppContext()
 
   if (!appDetail)

web/app/components/app/app-publisher/index.tsx

@@ -42,6 +42,9 @@ import type { InputVar } from '@/app/components/workflow/types'
 import { appDefaultIconBackground } from '@/config'
 import { useGlobalPublicStore } from '@/context/global-public-context'
 import { useFormatTimeFromNow } from '@/hooks/use-format-time-from-now'
+import { webSocketClient } from '@/app/components/workflow/collaboration/core/websocket-manager'
+import { collaborationManager } from '@/app/components/workflow/collaboration/core/collaboration-manager'
+import { useInvalidateAppWorkflow } from '@/service/use-workflow'
 import { AccessMode } from '@/models/access-control'
 import { useAppWhiteListSubjects, useGetUserCanAccessApp } from '@/service/access-control'
 import { fetchAppDetailDirect } from '@/service/apps'
@@ -148,6 +151,7 @@ const AppPublisher = ({
 
   const { data: userCanAccessApp, isLoading: isGettingUserCanAccessApp, refetch } = useGetUserCanAccessApp({ appId: appDetail?.id, enabled: false })
   const { data: appAccessSubjects, isLoading: isGettingAppWhiteListSubjects } = useAppWhiteListSubjects(appDetail?.id, open && systemFeatures.webapp_auth.enabled && appDetail?.access_mode === AccessMode.SPECIFIC_GROUPS_MEMBERS)
+  const invalidateAppWorkflow = useInvalidateAppWorkflow()
 
   const noAccessPermission = useMemo(() => systemFeatures.webapp_auth.enabled && appDetail && appDetail.access_mode !== AccessMode.EXTERNAL_MEMBERS && !userCanAccessApp?.result, [systemFeatures, appDetail, userCanAccessApp])
   const disabledFunctionButton = useMemo(() => (!publishedAt || missingStartNode || noAccessPermission), [publishedAt, missingStartNode, noAccessPermission])
@@ -182,11 +186,27 @@ const AppPublisher = ({
     try {
       await onPublish?.(params)
       setPublished(true)
+
+      const appId = appDetail?.id
+      const socket = appId ? webSocketClient.getSocket(appId) : null
+      if (appId)
+        invalidateAppWorkflow(appId)
+      if (socket) {
+        const timestamp = Date.now()
+        socket.emit('collaboration_event', {
+          type: 'app_publish_update',
+          data: {
+            action: 'published',
+            timestamp,
+          },
+          timestamp,
+        })
+      }
     }
     catch {
       setPublished(false)
     }
-  }, [onPublish])
+  }, [appDetail?.id, onPublish, invalidateAppWorkflow])
 
   const handleRestore = useCallback(async () => {
     try {
@@ -243,6 +263,18 @@ const AppPublisher = ({
     handlePublish()
   }, { exactMatch: true, useCapture: true })
 
+  useEffect(() => {
+    const appId = appDetail?.id
+    if (!appId) return
+
+    const unsubscribe = collaborationManager.onAppPublishUpdate((update: any) => {
+      if (update?.data?.action === 'published')
+        invalidateAppWorkflow(appId)
+    })
+
+    return unsubscribe
+  }, [appDetail?.id, invalidateAppWorkflow])
+
   const hasPublishedVersion = !!publishedAt
   const workflowToolDisabled = !hasPublishedVersion || !workflowToolAvailable
   const workflowToolMessage = workflowToolDisabled ? t('workflow.common.workflowAsToolDisabledHint') : undefined

web/app/components/apps/app-card.tsx

@@ -32,6 +32,8 @@ import { useGlobalPublicStore } from '@/context/global-public-context'
 import { formatTime } from '@/utils/time'
 import { useGetUserCanAccessApp } from '@/service/access-control'
 import dynamic from 'next/dynamic'
+import { UserAvatarList } from '@/app/components/base/user-avatar-list'
+import type { WorkflowOnlineUser } from '@/models/app'
 
 const EditAppModal = dynamic(() => import('@/app/components/explore/create-app-modal'), {
   ssr: false,
@@ -55,9 +57,10 @@ const AccessControl = dynamic(() => import('@/app/components/app/app-access-cont
 export type AppCardProps = {
   app: App
   onRefresh?: () => void
+  onlineUsers?: WorkflowOnlineUser[]
 }
 
-const AppCard = ({ app, onRefresh }: AppCardProps) => {
+const AppCard = ({ app, onRefresh, onlineUsers = [] }: AppCardProps) => {
   const { t } = useTranslation()
   const { notify } = useContext(ToastContext)
   const systemFeatures = useGlobalPublicStore(s => s.systemFeatures)
@@ -333,6 +336,19 @@ const AppCard = ({ app, onRefresh }: AppCardProps) => {
     return `${t('datasetDocuments.segment.editedAt')} ${timeText}`
   }, [app.updated_at, app.created_at])
 
+  const onlineUserAvatars = useMemo(() => {
+    if (!onlineUsers.length)
+      return []
+
+    return onlineUsers
+      .map(user => ({
+        id: user.user_id || user.sid || '',
+        name: user.username || 'User',
+        avatar_url: user.avatar || undefined,
+      }))
+      .filter(user => !!user.id)
+  }, [onlineUsers])
+
   return (
     <>
       <div
@@ -377,6 +393,11 @@ const AppCard = ({ app, onRefresh }: AppCardProps) => {
               <RiVerifiedBadgeLine className='h-4 w-4 text-text-quaternary' />
             </Tooltip>}
           </div>
+          <div>
+            {onlineUserAvatars.length > 0 && (
+              <UserAvatarList users={onlineUserAvatars} maxVisible={3} size={20} />
+            )}
+          </div>
         </div>
         <div className='title-wrapper h-[90px] px-[14px] text-xs leading-normal text-text-tertiary'>
           <div

web/app/components/apps/list.tsx

@@ -1,10 +1,11 @@
 'use client'
 
-import { useCallback, useEffect, useRef, useState } from 'react'
+import { useCallback, useEffect, useMemo, useRef, useState } from 'react'
 import {
   useRouter,
 } from 'next/navigation'
 import useSWRInfinite from 'swr/infinite'
+import useSWR from 'swr'
 import { useTranslation } from 'react-i18next'
 import { useDebounceFn } from 'ahooks'
 import {
@@ -19,8 +20,8 @@ import AppCard from './app-card'
 import NewAppCard from './new-app-card'
 import useAppsQueryState from './hooks/use-apps-query-state'
 import { useDSLDragDrop } from './hooks/use-dsl-drag-drop'
-import type { AppListResponse } from '@/models/app'
-import { fetchAppList } from '@/service/apps'
+import type { AppListResponse, WorkflowOnlineUser } from '@/models/app'
+import { fetchAppList, fetchWorkflowOnlineUsers } from '@/service/apps'
 import { useAppContext } from '@/context/app-context'
 import { NEED_REFRESH_APP_LIST_KEY } from '@/config'
 import { CheckModal } from '@/hooks/use-pay'
@@ -113,6 +114,36 @@ const List = () => {
     },
   )
 
+  const apps = useMemo(() => data?.flatMap(page => page.data) ?? [], [data])
+
+  const workflowIds = useMemo(() => {
+    const ids = new Set<string>()
+    apps.forEach((appItem) => {
+      const workflowId = appItem.id
+      if (!workflowId)
+        return
+
+      if (appItem.mode === 'workflow' || appItem.mode === 'advanced-chat')
+        ids.add(workflowId)
+    })
+    return Array.from(ids)
+  }, [apps])
+
+  const { data: onlineUsersByWorkflow, mutate: refreshOnlineUsers } = useSWR<Record<string, WorkflowOnlineUser[]>>(
+    workflowIds.length ? { workflowIds } : null,
+    fetchWorkflowOnlineUsers,
+  )
+
+  useEffect(() => {
+    const timer = window.setInterval(() => {
+      mutate()
+      if (workflowIds.length)
+        refreshOnlineUsers()
+    }, 10000)
+
+    return () => window.clearInterval(timer)
+  }, [workflowIds.join(','), mutate, refreshOnlineUsers])
+
   const anchorRef = useRef<HTMLDivElement>(null)
   const options = [
     { value: 'all', text: t('app.types.all'), icon: <RiApps2Line className='mr-1 h-[14px] w-[14px]' /> },
@@ -222,7 +253,12 @@ const List = () => {
             {isCurrentWorkspaceEditor
               && <NewAppCard ref={newAppCardRef} onSuccess={mutate} selectedAppType={activeTab} />}
             {data.map(({ data: apps }) => apps.map(app => (
-              <AppCard key={app.id} app={app} onRefresh={mutate} />
+              <AppCard
+                key={app.id}
+                app={app}
+                onRefresh={mutate}
+                onlineUsers={onlineUsersByWorkflow?.[app.id] ?? []}
+              />
             )))}
           </div>
           : <div className='relative grid grow grid-cols-1 content-start gap-4 overflow-hidden px-12 pt-2 sm:grid-cols-1 md:grid-cols-2 xl:grid-cols-4 2xl:grid-cols-5 2k:grid-cols-6'>

web/app/components/base/avatar/index.tsx

@@ -9,6 +9,7 @@ export type AvatarProps = {
   className?: string
   textClassName?: string
   onError?: (x: boolean) => void
+  backgroundColor?: string
 }
 const Avatar = ({
   name,
@@ -17,9 +18,18 @@ const Avatar = ({
   className,
   textClassName,
   onError,
+  backgroundColor,
 }: AvatarProps) => {
-  const avatarClassName = 'shrink-0 flex items-center rounded-full bg-primary-600'
-  const style = { width: `${size}px`, height: `${size}px`, fontSize: `${size}px`, lineHeight: `${size}px` }
+  const avatarClassName = backgroundColor
+    ? 'shrink-0 flex items-center rounded-full'
+    : 'shrink-0 flex items-center rounded-full bg-primary-600'
+  const style = {
+    width: `${size}px`,
+    height: `${size}px`,
+    fontSize: `${size}px`,
+    lineHeight: `${size}px`,
+    ...(backgroundColor && !avatar ? { backgroundColor } : {}),
+  }
   const [imgError, setImgError] = useState(false)
 
   const handleError = () => {
@@ -35,14 +45,18 @@ const Avatar = ({
 
   if (avatar && !imgError) {
     return (
-      <img
+      <span
         className={cn(avatarClassName, className)}
         style={style}
-        alt={name}
-        src={avatar}
-        onError={handleError}
-        onLoad={() => onError?.(false)}
-      />
+      >
+        <img
+          className='h-full w-full rounded-full object-cover'
+          alt={name}
+          src={avatar}
+          onError={handleError}
+          onLoad={() => onError?.(false)}
+        />
+      </span>
     )
   }
 

web/app/components/base/content-dialog/index.tsx

@@ -15,11 +15,12 @@ const ContentDialog = ({
   onClose,
   children,
 }: ContentDialogProps) => {
+  // z-[70]: Ensures dialog appears above workflow operators (z-[60]) and other UI elements
   return (
     <Transition
       show={show}
       as='div'
-      className='absolute left-0 top-0 z-30 box-border h-full w-full p-2'
+      className='absolute left-0 top-0 z-[70] box-border h-full w-full p-2'
     >
       <TransitionChild>
         <div

web/app/components/base/icons/assets/public/common/enter-key.svg

@@ -0,0 +1,4 @@
+<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M0 4C0 1.79086 1.79086 0 4 0H12C14.2091 0 16 1.79086 16 4V12C16 14.2091 14.2091 16 12 16H4C1.79086 16 0 14.2091 0 12V4Z" fill="white" fill-opacity="0.12"/>
+<path d="M3.42756 8.7358V7.62784H10.8764C11.2003 7.62784 11.4957 7.5483 11.7628 7.3892C12.0298 7.23011 12.2415 7.01705 12.3977 6.75C12.5568 6.48295 12.6364 6.1875 12.6364 5.86364C12.6364 5.53977 12.5568 5.24574 12.3977 4.98153C12.2386 4.71449 12.0256 4.50142 11.7585 4.34233C11.4943 4.18324 11.2003 4.10369 10.8764 4.10369H10.3991V3H10.8764C11.4048 3 11.8849 3.12926 12.3168 3.38778C12.7486 3.64631 13.0938 3.99148 13.3523 4.4233C13.6108 4.85511 13.7401 5.33523 13.7401 5.86364C13.7401 6.25852 13.6648 6.62926 13.5142 6.97585C13.3665 7.32244 13.1619 7.62784 12.9006 7.89205C12.6392 8.15625 12.3352 8.36364 11.9886 8.5142C11.642 8.66193 11.2713 8.7358 10.8764 8.7358H3.42756ZM6.16761 12.0554L2.29403 8.18182L6.16761 4.30824L6.9304 5.07102L3.81534 8.18182L6.9304 11.2926L6.16761 12.0554Z" fill="white"/>
+</svg>

web/app/components/base/icons/assets/public/other/comment.svg

@@ -0,0 +1,3 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="14" height="12" viewBox="0 0 14 12" fill="none">
+<path d="M12.3334 4C12.3334 2.52725 11.1395 1.33333 9.66671 1.33333H4.33337C2.86062 1.33333 1.66671 2.52724 1.66671 4V10.6667H9.66671C11.1395 10.6667 12.3334 9.47274 12.3334 8V4ZM7.66671 6.66667V8H4.33337V6.66667H7.66671ZM9.66671 4V5.33333H4.33337V4H9.66671ZM13.6667 8C13.6667 10.2091 11.8758 12 9.66671 12H0.333374V4C0.333374 1.79086 2.12424 0 4.33337 0H9.66671C11.8758 0 13.6667 1.79086 13.6667 4V8Z" fill="currentColor"/>
+</svg>

web/app/components/base/icons/src/public/common/EnterKey.json

@@ -0,0 +1,36 @@
+{
+	"icon": {
+		"type": "element",
+		"isRootNode": true,
+		"name": "svg",
+		"attributes": {
+			"width": "16",
+			"height": "16",
+			"viewBox": "0 0 16 16",
+			"fill": "none",
+			"xmlns": "http://www.w3.org/2000/svg"
+		},
+		"children": [
+			{
+				"type": "element",
+				"name": "path",
+				"attributes": {
+					"d": "M0 4C0 1.79086 1.79086 0 4 0H12C14.2091 0 16 1.79086 16 4V12C16 14.2091 14.2091 16 12 16H4C1.79086 16 0 14.2091 0 12V4Z",
+					"fill": "white",
+					"fill-opacity": "0.12"
+				},
+				"children": []
+			},
+			{
+				"type": "element",
+				"name": "path",
+				"attributes": {
+					"d": "M3.42756 8.7358V7.62784H10.8764C11.2003 7.62784 11.4957 7.5483 11.7628 7.3892C12.0298 7.23011 12.2415 7.01705 12.3977 6.75C12.5568 6.48295 12.6364 6.1875 12.6364 5.86364C12.6364 5.53977 12.5568 5.24574 12.3977 4.98153C12.2386 4.71449 12.0256 4.50142 11.7585 4.34233C11.4943 4.18324 11.2003 4.10369 10.8764 4.10369H10.3991V3H10.8764C11.4048 3 11.8849 3.12926 12.3168 3.38778C12.7486 3.64631 13.0938 3.99148 13.3523 4.4233C13.6108 4.85511 13.7401 5.33523 13.7401 5.86364C13.7401 6.25852 13.6648 6.62926 13.5142 6.97585C13.3665 7.32244 13.1619 7.62784 12.9006 7.89205C12.6392 8.15625 12.3352 8.36364 11.9886 8.5142C11.642 8.66193 11.2713 8.7358 10.8764 8.7358H3.42756ZM6.16761 12.0554L2.29403 8.18182L6.16761 4.30824L6.9304 5.07102L3.81534 8.18182L6.9304 11.2926L6.16761 12.0554Z",
+					"fill": "white"
+				},
+				"children": []
+			}
+		]
+	},
+	"name": "EnterKey"
+}

web/app/components/base/icons/src/public/common/EnterKey.tsx

@@ -0,0 +1,20 @@
+// GENERATE BY script
+// DON NOT EDIT IT MANUALLY
+
+import * as React from 'react'
+import data from './EnterKey.json'
+import IconBase from '@/app/components/base/icons/IconBase'
+import type { IconData } from '@/app/components/base/icons/IconBase'
+
+const Icon = (
+  {
+    ref,
+    ...props
+  }: React.SVGProps<SVGSVGElement> & {
+    ref?: React.RefObject<React.RefObject<HTMLOrSVGElement>>;
+  },
+) => <IconBase {...props} ref={ref} data={data as IconData} />
+
+Icon.displayName = 'EnterKey'
+
+export default Icon

web/app/components/base/icons/src/public/common/index.ts

@@ -1,6 +1,7 @@
 export { default as D } from './D'
 export { default as DiagonalDividingLine } from './DiagonalDividingLine'
 export { default as Dify } from './Dify'
+export { default as EnterKey } from './EnterKey'
 export { default as Gdpr } from './Gdpr'
 export { default as Github } from './Github'
 export { default as Highlight } from './Highlight'

web/app/components/base/icons/src/public/other/Comment.json

@@ -0,0 +1,26 @@
+{
+	"icon": {
+		"type": "element",
+		"isRootNode": true,
+		"name": "svg",
+		"attributes": {
+			"xmlns": "http://www.w3.org/2000/svg",
+			"width": "14",
+			"height": "12",
+			"viewBox": "0 0 14 12",
+			"fill": "none"
+		},
+		"children": [
+			{
+				"type": "element",
+				"name": "path",
+				"attributes": {
+					"d": "M12.3334 4C12.3334 2.52725 11.1395 1.33333 9.66671 1.33333H4.33337C2.86062 1.33333 1.66671 2.52724 1.66671 4V10.6667H9.66671C11.1395 10.6667 12.3334 9.47274 12.3334 8V4ZM7.66671 6.66667V8H4.33337V6.66667H7.66671ZM9.66671 4V5.33333H4.33337V4H9.66671ZM13.6667 8C13.6667 10.2091 11.8758 12 9.66671 12H0.333374V4C0.333374 1.79086 2.12424 0 4.33337 0H9.66671C11.8758 0 13.6667 1.79086 13.6667 4V8Z",
+					"fill": "currentColor"
+				},
+				"children": []
+			}
+		]
+	},
+	"name": "Comment"
+}

web/app/components/base/icons/src/public/other/Comment.tsx

@@ -0,0 +1,20 @@
+// GENERATE BY script
+// DON NOT EDIT IT MANUALLY
+
+import * as React from 'react'
+import data from './Comment.json'
+import IconBase from '@/app/components/base/icons/IconBase'
+import type { IconData } from '@/app/components/base/icons/IconBase'
+
+const Icon = (
+  {
+    ref,
+    ...props
+  }: React.SVGProps<SVGSVGElement> & {
+    ref?: React.RefObject<React.RefObject<HTMLOrSVGElement>>;
+  },
+) => <IconBase {...props} ref={ref} data={data as IconData} />
+
+Icon.displayName = 'Comment'
+
+export default Icon

web/app/components/base/icons/src/public/other/index.ts

@@ -1,4 +1,5 @@
 export { default as Icon3Dots } from './Icon3Dots'
+export { default as Comment } from './Comment'
 export { default as DefaultToolIcon } from './DefaultToolIcon'
 export { default as Message3Fill } from './Message3Fill'
 export { default as RowStruct } from './RowStruct'

web/app/components/base/prompt-editor/index.tsx

@@ -2,6 +2,7 @@
 
 import type { FC } from 'react'
 import React, { useEffect } from 'react'
+import { useLexicalComposerContext } from '@lexical/react/LexicalComposerContext'
 import type {
   EditorState,
 } from 'lexical'
@@ -80,6 +81,29 @@ import {
 import { useEventEmitterContextContext } from '@/context/event-emitter'
 import cn from '@/utils/classnames'
 
+const ValueSyncPlugin: FC<{ value?: string }> = ({ value }) => {
+  const [editor] = useLexicalComposerContext()
+
+  useEffect(() => {
+    if (value === undefined)
+      return
+
+    const incomingValue = value ?? ''
+    const shouldUpdate = editor.getEditorState().read(() => {
+      const currentText = $getRoot().getChildren().map(node => node.getTextContent()).join('\n')
+      return currentText !== incomingValue
+    })
+
+    if (!shouldUpdate)
+      return
+
+    const editorState = editor.parseEditorState(textToEditorState(incomingValue))
+    editor.setEditorState(editorState)
+  }, [editor, value])
+
+  return null
+}
+
 export type PromptEditorProps = {
   instanceId?: string
   compact?: boolean
@@ -293,6 +317,7 @@ const PromptEditor: FC<PromptEditorProps> = ({
             <VariableValueBlock />
           )
         }
+        <ValueSyncPlugin value={value} />
         <OnChangePlugin onChange={handleEditorChange} />
         <OnBlurBlock onBlur={onBlur} onFocus={onFocus} />
         <UpdateBlock instanceId={instanceId} />

web/app/components/base/user-avatar-list/index.tsx

@@ -0,0 +1,77 @@
+import type { FC } from 'react'
+import { memo } from 'react'
+import { getUserColor } from '@/app/components/workflow/collaboration/utils/user-color'
+import { useAppContext } from '@/context/app-context'
+import Avatar from '@/app/components/base/avatar'
+
+type User = {
+  id: string
+  name: string
+  avatar_url?: string | null
+}
+
+type UserAvatarListProps = {
+  users: User[]
+  maxVisible?: number
+  size?: number
+  className?: string
+  showCount?: boolean
+}
+
+export const UserAvatarList: FC<UserAvatarListProps> = memo(({
+  users,
+  maxVisible = 3,
+  size = 24,
+  className = '',
+  showCount = true,
+}) => {
+  const { userProfile } = useAppContext()
+  if (!users.length) return null
+
+  const shouldShowCount = showCount && users.length > maxVisible
+  const actualMaxVisible = shouldShowCount ? Math.max(1, maxVisible - 1) : maxVisible
+  const visibleUsers = users.slice(0, actualMaxVisible)
+  const remainingCount = users.length - actualMaxVisible
+
+  const currentUserId = userProfile?.id
+
+  return (
+    <div className={`flex items-center -space-x-1 ${className}`}>
+      {visibleUsers.map((user, index) => {
+        const isCurrentUser = user.id === currentUserId
+        const userColor = isCurrentUser ? undefined : getUserColor(user.id)
+        return (
+          <div
+            key={`${user.id}-${index}`}
+            className='relative'
+            style={{ zIndex: visibleUsers.length - index }}
+          >
+            <Avatar
+              name={user.name}
+              avatar={user.avatar_url || null}
+              size={size}
+              className='ring-2 ring-components-panel-bg'
+              backgroundColor={userColor}
+            />
+          </div>
+        )
+      },
+
+      )}
+      {shouldShowCount && remainingCount > 0 && (
+        <div
+          className={'flex items-center justify-center rounded-full bg-gray-500 text-[10px] leading-none text-white ring-2 ring-components-panel-bg'}
+          style={{
+            zIndex: 0,
+            width: size,
+            height: size,
+          }}
+        >
+          +{remainingCount}
+        </div>
+      )}
+    </div>
+  )
+})
+
+UserAvatarList.displayName = 'UserAvatarList'

web/app/components/datasets/hit-testing/index.tsx

@@ -49,7 +49,7 @@ const HitTestingPage: FC<Props> = ({ datasetId }: Props) => {
   const media = useBreakpoints()
   const isMobile = media === MediaType.mobile
 
-  const [hitResult, setHitResult] = useState<HitTestingResponse | undefined>() // 初始化记录为空数组
+  const [hitResult, setHitResult] = useState<HitTestingResponse | undefined>() // Initialize records as empty array
   const [externalHitResult, setExternalHitResult] = useState<ExternalKnowledgeBaseHitTestingResponse | undefined>()
   const [submitLoading, setSubmitLoading] = useState(false)
   const [text, setText] = useState('')

web/app/components/header/account-setting/menu-dialog.tsx

@@ -35,7 +35,7 @@ const MenuDialog = ({
 
   return (
     <Transition appear show={show} as={Fragment}>
-      <Dialog as="div" className="relative z-[60]" onClose={noop}>
+      <Dialog as="div" className="relative z-[70]" onClose={noop}>
         <div className="fixed inset-0">
           <div className="flex min-h-full flex-col items-center justify-center">
             <TransitionChild>

web/app/components/tools/mcp/mcp-server-modal.tsx

@@ -16,6 +16,7 @@ import {
   useUpdateMCPServer,
 } from '@/service/use-tools'
 import cn from '@/utils/classnames'
+import { webSocketClient } from '@/app/components/workflow/collaboration/core/websocket-manager'
 
 export type ModalProps = {
   appID: string
@@ -59,6 +60,21 @@ const MCPServerModal = ({
     return res
   }
 
+  const emitMcpServerUpdate = (action: 'created' | 'updated') => {
+    const socket = webSocketClient.getSocket(appID)
+    if (!socket) return
+
+    const timestamp = Date.now()
+    socket.emit('collaboration_event', {
+      type: 'mcp_server_update',
+      data: {
+        action,
+        timestamp,
+      },
+      timestamp,
+    })
+  }
+
   const submit = async () => {
     if (!data) {
       const payload: any = {
@@ -71,6 +87,7 @@ const MCPServerModal = ({
 
       await createMCPServer(payload)
       invalidateMCPServerDetail(appID)
+      emitMcpServerUpdate('created')
       onHide()
     }
     else {
@@ -83,6 +100,7 @@ const MCPServerModal = ({
       payload.description = description
       await updateMCPServer(payload)
       invalidateMCPServerDetail(appID)
+      emitMcpServerUpdate('updated')
       onHide()
     }
   }
@@ -92,6 +110,7 @@ const MCPServerModal = ({
       isShow={show}
       onClose={onHide}
       className={cn('relative !max-w-[520px] !p-0')}
+      highPriority
     >
       <div className='absolute right-5 top-5 z-10 cursor-pointer p-1.5' onClick={onHide}>
         <RiCloseLine className='h-5 w-5 text-text-tertiary' />

web/app/components/tools/mcp/mcp-service-card.tsx

@@ -27,6 +27,8 @@ import { BlockEnum } from '@/app/components/workflow/types'
 import cn from '@/utils/classnames'
 import { fetchAppDetail } from '@/service/apps'
 import { useDocLink } from '@/context/i18n'
+import { webSocketClient } from '@/app/components/workflow/collaboration/core/websocket-manager'
+import { collaborationManager } from '@/app/components/workflow/collaboration/core/collaboration-manager'
 
 export type IAppCardProps = {
   appInfo: AppDetailResponse & Partial<AppSSO>
@@ -97,6 +99,19 @@ function MCPServiceCard({
   const onGenCode = async () => {
     await refreshMCPServerCode(detail?.id || '')
     invalidateMCPServerDetail(appId)
+
+    // Emit collaboration event to notify other clients of MCP server changes
+    const socket = webSocketClient.getSocket(appId)
+    if (socket) {
+      socket.emit('collaboration_event', {
+        type: 'mcp_server_update',
+        data: {
+          action: 'codeRegenerated',
+          timestamp: Date.now(),
+        },
+        timestamp: Date.now(),
+      })
+    }
   }
 
   const onChangeStatus = async (state: boolean) => {
@@ -126,6 +141,20 @@ function MCPServiceCard({
       })
       invalidateMCPServerDetail(appId)
     }
+
+    // Emit collaboration event to notify other clients of MCP server status change
+    const socket = webSocketClient.getSocket(appId)
+    if (socket) {
+      socket.emit('collaboration_event', {
+        type: 'mcp_server_update',
+        data: {
+          action: 'statusChanged',
+          status: state ? 'active' : 'inactive',
+          timestamp: Date.now(),
+        },
+        timestamp: Date.now(),
+      })
+    }
   }
 
   const handleServerModalHide = () => {
@@ -138,6 +167,23 @@ function MCPServiceCard({
     setActivated(serverActivated)
   }, [serverActivated])
 
+  // Listen for collaborative MCP server updates from other clients
+  useEffect(() => {
+    if (!appId) return
+
+    const unsubscribe = collaborationManager.onMcpServerUpdate(async (update: any) => {
+      try {
+        console.log('Received MCP server update from collaboration:', update)
+        invalidateMCPServerDetail(appId)
+      }
+      catch (error) {
+        console.error('MCP server update failed:', error)
+      }
+    })
+
+    return unsubscribe
+  }, [appId, invalidateMCPServerDetail])
+
   if (!currentWorkflow && isAdvancedApp)
     return null
 

web/app/components/workflow-app/components/workflow-main.tsx

@@ -1,11 +1,18 @@
 import {
   useCallback,
+  useEffect,
   useMemo,
+  useRef,
+  useState,
 } from 'react'
 import { useFeaturesStore } from '@/app/components/base/features/hooks'
+import type { Features as FeaturesData } from '@/app/components/base/features/types'
+import { SupportUploadFileTypes } from '@/app/components/workflow/types'
+import { FILE_EXTS } from '@/app/components/base/prompt-editor/constants'
 import { WorkflowWithInnerContext } from '@/app/components/workflow'
 import type { WorkflowProps } from '@/app/components/workflow'
 import WorkflowChildren from './workflow-children'
+
 import {
   useAvailableNodesMetaData,
   useConfigsMap,
@@ -18,7 +25,12 @@ import {
   useWorkflowRun,
   useWorkflowStartRun,
 } from '../hooks'
-import { useWorkflowStore } from '@/app/components/workflow/store'
+import { useWorkflowUpdate } from '@/app/components/workflow/hooks/use-workflow-interactions'
+import { useStore, useWorkflowStore } from '@/app/components/workflow/store'
+import { useCollaboration } from '@/app/components/workflow/collaboration'
+import { collaborationManager } from '@/app/components/workflow/collaboration'
+import { fetchWorkflowDraft } from '@/service/workflow'
+import { useReactFlow, useStoreApi } from 'reactflow'
 
 type WorkflowMainProps = Pick<WorkflowProps, 'nodes' | 'edges' | 'viewport'>
 const WorkflowMain = ({
@@ -28,6 +40,43 @@ const WorkflowMain = ({
 }: WorkflowMainProps) => {
   const featuresStore = useFeaturesStore()
   const workflowStore = useWorkflowStore()
+  const appId = useStore(s => s.appId)
+  const containerRef = useRef<HTMLDivElement>(null)
+  const reactFlow = useReactFlow()
+
+  const store = useStoreApi()
+  const {
+    startCursorTracking,
+    stopCursorTracking,
+    onlineUsers,
+    cursors,
+    isConnected,
+    isEnabled: isCollaborationEnabled,
+  } = useCollaboration(appId || '', store)
+  const [myUserId, setMyUserId] = useState<string | null>(null)
+
+  useEffect(() => {
+    if (isCollaborationEnabled && isConnected)
+      setMyUserId('current-user')
+    else
+      setMyUserId(null)
+  }, [isCollaborationEnabled, isConnected])
+
+  const filteredCursors = Object.fromEntries(
+    Object.entries(cursors).filter(([userId]) => userId !== myUserId),
+  )
+
+  useEffect(() => {
+    if (!isCollaborationEnabled)
+      return
+
+    if (containerRef.current)
+      startCursorTracking(containerRef as React.RefObject<HTMLElement>, reactFlow)
+
+    return () => {
+      stopCursorTracking()
+    }
+  }, [startCursorTracking, stopCursorTracking, reactFlow, isCollaborationEnabled])
 
   const handleWorkflowDataUpdate = useCallback((payload: any) => {
     const {
@@ -38,7 +87,33 @@ const WorkflowMain = ({
     if (features && featuresStore) {
       const { setFeatures } = featuresStore.getState()
 
-      setFeatures(features)
+      const transformedFeatures: FeaturesData = {
+        file: {
+          image: {
+            enabled: !!features.file_upload?.image?.enabled,
+            number_limits: features.file_upload?.image?.number_limits || 3,
+            transfer_methods: features.file_upload?.image?.transfer_methods || ['local_file', 'remote_url'],
+          },
+          enabled: !!(features.file_upload?.enabled || features.file_upload?.image?.enabled),
+          allowed_file_types: features.file_upload?.allowed_file_types || [SupportUploadFileTypes.image],
+          allowed_file_extensions: features.file_upload?.allowed_file_extensions || FILE_EXTS[SupportUploadFileTypes.image].map(ext => `.${ext}`),
+          allowed_file_upload_methods: features.file_upload?.allowed_file_upload_methods || features.file_upload?.image?.transfer_methods || ['local_file', 'remote_url'],
+          number_limits: features.file_upload?.number_limits || features.file_upload?.image?.number_limits || 3,
+        },
+        opening: {
+          enabled: !!features.opening_statement,
+          opening_statement: features.opening_statement,
+          suggested_questions: features.suggested_questions,
+        },
+        suggested: features.suggested_questions_after_answer || { enabled: false },
+        speech2text: features.speech_to_text || { enabled: false },
+        text2speech: features.text_to_speech || { enabled: false },
+        citation: features.retriever_resource || { enabled: false },
+        moderation: features.sensitive_word_avoidance || { enabled: false },
+        annotationReply: features.annotation_reply || { enabled: false },
+      }
+
+      setFeatures(transformedFeatures)
     }
     if (conversation_variables) {
       const { setConversationVariables } = workflowStore.getState()
@@ -55,6 +130,7 @@ const WorkflowMain = ({
     syncWorkflowDraftWhenPageClose,
   } = useNodesSyncDraft()
   const { handleRefreshWorkflowDraft } = useWorkflowRefreshDraft()
+  const { handleUpdateWorkflowCanvas } = useWorkflowUpdate()
   const {
     handleBackupDraft,
     handleLoadBackupDraft,
@@ -62,6 +138,63 @@ const WorkflowMain = ({
     handleRun,
     handleStopRun,
   } = useWorkflowRun()
+
+  useEffect(() => {
+    if (!appId || !isCollaborationEnabled) return
+
+    const unsubscribe = collaborationManager.onVarsAndFeaturesUpdate(async (update: any) => {
+      try {
+        const response = await fetchWorkflowDraft(`/apps/${appId}/workflows/draft`)
+        handleWorkflowDataUpdate(response)
+      }
+      catch (error) {
+        console.error('workflow vars and features update failed:', error)
+      }
+    })
+
+    return unsubscribe
+  }, [appId, handleWorkflowDataUpdate, isCollaborationEnabled])
+
+  // Listen for workflow updates from other users
+  useEffect(() => {
+    if (!appId || !isCollaborationEnabled) return
+
+    const unsubscribe = collaborationManager.onWorkflowUpdate(async () => {
+      console.log('Received workflow update from collaborator, fetching latest workflow data')
+      try {
+        const response = await fetchWorkflowDraft(`/apps/${appId}/workflows/draft`)
+
+        // Handle features, variables etc.
+        handleWorkflowDataUpdate(response)
+
+        // Update workflow canvas (nodes, edges, viewport)
+        if (response.graph) {
+          handleUpdateWorkflowCanvas({
+            nodes: response.graph.nodes || [],
+            edges: response.graph.edges || [],
+            viewport: response.graph.viewport || { x: 0, y: 0, zoom: 1 },
+          })
+        }
+      }
+      catch (error) {
+        console.error('Failed to fetch updated workflow:', error)
+      }
+    })
+
+    return unsubscribe
+  }, [appId, handleWorkflowDataUpdate, handleUpdateWorkflowCanvas, isCollaborationEnabled])
+
+  // Listen for sync requests from other users (only processed by leader)
+  useEffect(() => {
+    if (!appId || !isCollaborationEnabled) return
+
+    const unsubscribe = collaborationManager.onSyncRequest(() => {
+      console.log('Leader received sync request, performing sync')
+      doSyncWorkflowDraft()
+    })
+
+    return unsubscribe
+  }, [appId, doSyncWorkflowDraft, isCollaborationEnabled])
   const {
     handleStartWorkflowRun,
     handleWorkflowStartRunInChatflow,
@@ -79,6 +212,7 @@ const WorkflowMain = ({
   } = useDSL()
 
   const configsMap = useConfigsMap()
+
   const { fetchInspectVars } = useSetWorkflowVarsWithValue({
     ...configsMap,
   })
@@ -176,15 +310,23 @@ const WorkflowMain = ({
   ])
 
   return (
-    <WorkflowWithInnerContext
-      nodes={nodes}
-      edges={edges}
-      viewport={viewport}
-      onWorkflowDataUpdate={handleWorkflowDataUpdate}
-      hooksStore={hooksStore as any}
+    <div
+      ref={containerRef}
+      className="relative h-full w-full"
     >
-      <WorkflowChildren />
-    </WorkflowWithInnerContext>
+      <WorkflowWithInnerContext
+        nodes={nodes}
+        edges={edges}
+        viewport={viewport}
+        onWorkflowDataUpdate={handleWorkflowDataUpdate}
+        hooksStore={hooksStore as any}
+        cursors={filteredCursors}
+        myUserId={myUserId}
+        onlineUsers={onlineUsers}
+      >
+        <WorkflowChildren />
+      </WorkflowWithInnerContext>
+    </div>
   )
 }
 

web/app/components/workflow-app/components/workflow-panel.tsx

@@ -7,6 +7,7 @@ import { useStore } from '@/app/components/workflow/store'
 import {
   useIsChatMode,
 } from '../hooks'
+import CommentsPanel from '@/app/components/workflow/panel/comments-panel'
 import { useStore as useAppStore } from '@/app/components/app/store'
 import type { PanelProps } from '@/app/components/workflow/panel'
 import Panel from '@/app/components/workflow/panel'
@@ -67,6 +68,7 @@ const WorkflowPanelOnRight = () => {
   const showDebugAndPreviewPanel = useStore(s => s.showDebugAndPreviewPanel)
   const showChatVariablePanel = useStore(s => s.showChatVariablePanel)
   const showGlobalVariablePanel = useStore(s => s.showGlobalVariablePanel)
+  const controlMode = useStore(s => s.controlMode)
 
   return (
     <>
@@ -100,6 +102,7 @@ const WorkflowPanelOnRight = () => {
           <GlobalVariablePanel />
         )
       }
+      {controlMode === 'comment' && <CommentsPanel />}
     </>
   )
 }

web/app/components/workflow-app/hooks/use-nodes-sync-draft.ts

@@ -1,13 +1,16 @@
 import { useCallback } from 'react'
 import { produce } from 'immer'
 import { useStoreApi } from 'reactflow'
+import { useParams } from 'next/navigation'
 import { useWorkflowStore } from '@/app/components/workflow/store'
 import { useNodesReadOnly } from '@/app/components/workflow/hooks/use-workflow'
 import { useSerialAsyncCallback } from '@/app/components/workflow/hooks/use-serial-async-callback'
-import { syncWorkflowDraft } from '@/service/workflow'
+import { type WorkflowDraftFeaturesPayload, syncWorkflowDraft } from '@/service/workflow'
 import { useFeaturesStore } from '@/app/components/base/features/hooks'
 import { API_PREFIX } from '@/config'
 import { useWorkflowRefreshDraft } from '.'
+import { collaborationManager } from '@/app/components/workflow/collaboration/core/collaboration-manager'
+import { useGlobalPublicStore } from '@/context/global-public-context'
 
 export const useNodesSyncDraft = () => {
   const store = useStoreApi()
@@ -15,6 +18,8 @@ export const useNodesSyncDraft = () => {
   const featuresStore = useFeaturesStore()
   const { getNodesReadOnly } = useNodesReadOnly()
   const { handleRefreshWorkflowDraft } = useWorkflowRefreshDraft()
+  const params = useParams()
+  const isCollaborationEnabled = useGlobalPublicStore(s => s.systemFeatures.enable_collaboration_mode)
 
   const getPostParams = useCallback(() => {
     const {
@@ -52,7 +57,16 @@ export const useNodesSyncDraft = () => {
         })
       })
     })
-    const viewport = { x, y, zoom }
+    const featuresPayload: WorkflowDraftFeaturesPayload = {
+      opening_statement: features.opening?.enabled ? (features.opening?.opening_statement || '') : '',
+      suggested_questions: features.opening?.enabled ? (features.opening?.suggested_questions || []) : [],
+      suggested_questions_after_answer: features.suggested,
+      text_to_speech: features.text2speech,
+      speech_to_text: features.speech2text,
+      retriever_resource: features.citation,
+      sensitive_word_avoidance: features.moderation,
+      file_upload: features.file,
+    }
 
     return {
       url: `/apps/${appId}/workflows/draft`,
@@ -60,33 +74,44 @@ export const useNodesSyncDraft = () => {
         graph: {
           nodes: producedNodes,
           edges: producedEdges,
-          viewport,
-        },
-        features: {
-          opening_statement: features.opening?.enabled ? (features.opening?.opening_statement || '') : '',
-          suggested_questions: features.opening?.enabled ? (features.opening?.suggested_questions || []) : [],
-          suggested_questions_after_answer: features.suggested,
-          text_to_speech: features.text2speech,
-          speech_to_text: features.speech2text,
-          retriever_resource: features.citation,
-          sensitive_word_avoidance: features.moderation,
-          file_upload: features.file,
+          viewport: {
+            x,
+            y,
+            zoom,
+          },
         },
+        features: featuresPayload,
         environment_variables: environmentVariables,
         conversation_variables: conversationVariables,
         hash: syncWorkflowDraftHash,
+        _is_collaborative: isCollaborationEnabled,
       },
     }
-  }, [store, featuresStore, workflowStore])
+  }, [store, featuresStore, workflowStore, isCollaborationEnabled])
 
   const syncWorkflowDraftWhenPageClose = useCallback(() => {
     if (getNodesReadOnly())
       return
+
+    // Check leader status at sync time
+    const currentIsLeader = isCollaborationEnabled ? collaborationManager.getIsLeader() : true
+
+    // Only allow leader to sync data
+    if (isCollaborationEnabled && !currentIsLeader) {
+      console.log('Not leader, skipping sync on page close')
+      return
+    }
+
     const postParams = getPostParams()
 
-    if (postParams)
-      navigator.sendBeacon(`${API_PREFIX}${postParams.url}`, JSON.stringify(postParams.params))
-  }, [getPostParams, getNodesReadOnly])
+    if (postParams) {
+      console.log('Leader syncing workflow draft on page close')
+      navigator.sendBeacon(
+        `${API_PREFIX}/apps/${params.appId}/workflows/draft`,
+        JSON.stringify(postParams.params),
+      )
+    }
+  }, [getPostParams, params.appId, getNodesReadOnly, isCollaborationEnabled])
 
   const performSync = useCallback(async (
     notRefreshWhenSyncError?: boolean,
@@ -95,9 +120,24 @@ export const useNodesSyncDraft = () => {
       onError?: () => void
       onSettled?: () => void
     },
+    forceUpload?: boolean,
   ) => {
     if (getNodesReadOnly())
       return
+
+    // Check leader status at sync time
+    const currentIsLeader = isCollaborationEnabled ? collaborationManager.getIsLeader() : true
+
+    // If not leader and not forcing upload, request the leader to sync
+    if (isCollaborationEnabled && !currentIsLeader && !forceUpload) {
+      console.log('Not leader, requesting leader to sync workflow draft')
+      if (isCollaborationEnabled)
+        collaborationManager.emitSyncRequest()
+      callback?.onSettled?.()
+      return
+    }
+
+    console.log(forceUpload ? 'Force uploading workflow draft' : 'Leader performing workflow draft sync')
     const postParams = getPostParams()
 
     if (postParams) {
@@ -105,17 +145,31 @@ export const useNodesSyncDraft = () => {
         setSyncWorkflowDraftHash,
         setDraftUpdatedAt,
       } = workflowStore.getState()
+
+      // Add force_upload parameter if needed
+      const finalParams = {
+        ...postParams.params,
+        ...(forceUpload && { force_upload: true }),
+      }
+
       try {
-        const res = await syncWorkflowDraft(postParams)
+        const res = await syncWorkflowDraft({
+          url: postParams.url,
+          params: finalParams,
+        })
         setSyncWorkflowDraftHash(res.hash)
         setDraftUpdatedAt(res.updated_at)
+        console.log('Leader successfully synced workflow draft')
         callback?.onSuccess?.()
       }
       catch (error: any) {
+        console.error('Leader failed to sync workflow draft:', error)
         if (error && error.json && !error.bodyUsed) {
           error.json().then((err: any) => {
-            if (err.code === 'draft_workflow_not_sync' && !notRefreshWhenSyncError)
+            if (err.code === 'draft_workflow_not_sync' && !notRefreshWhenSyncError) {
+              console.error('draft_workflow_not_sync', err)
               handleRefreshWorkflowDraft()
+            }
           })
         }
         callback?.onError?.()
@@ -124,7 +178,7 @@ export const useNodesSyncDraft = () => {
         callback?.onSettled?.()
       }
     }
-  }, [workflowStore, getPostParams, getNodesReadOnly, handleRefreshWorkflowDraft])
+  }, [workflowStore, getPostParams, getNodesReadOnly, handleRefreshWorkflowDraft, isCollaborationEnabled])
 
   const doSyncWorkflowDraft = useSerialAsyncCallback(performSync, getNodesReadOnly)
 

web/app/components/workflow-app/index.tsx

@@ -30,6 +30,7 @@ import {
 import type { InjectWorkflowStoreSliceFn } from '@/app/components/workflow/store'
 import { createWorkflowSlice } from './store/workflow/workflow-slice'
 import WorkflowAppMain from './components/workflow-main'
+import { collaborationManager } from '@/app/components/workflow/collaboration/core/collaboration-manager'
 import { useSearchParams } from 'next/navigation'
 
 import { fetchRunDetail } from '@/service/log'
@@ -83,15 +84,20 @@ const WorkflowAppWithAdditionalContext = () => {
   }, [workflowStore])
 
   const nodesData = useMemo(() => {
-    if (data)
-      return initialNodes(data.graph.nodes, data.graph.edges)
-
+    if (data) {
+      const processedNodes = initialNodes(data.graph.nodes, data.graph.edges)
+      collaborationManager.setNodes([], processedNodes)
+      return processedNodes
+    }
     return []
   }, [data])
-  const edgesData = useMemo(() => {
-    if (data)
-      return initialEdges(data.graph.edges, data.graph.nodes)
 
+  const edgesData = useMemo(() => {
+    if (data) {
+      const processedEdges = initialEdges(data.graph.edges, data.graph.nodes)
+      collaborationManager.setEdges([], processedEdges)
+      return processedEdges
+    }
     return []
   }, [data])
 

web/app/components/workflow/candidate-node.tsx

@@ -4,7 +4,6 @@ import {
 import { produce } from 'immer'
 import {
   useReactFlow,
-  useStoreApi,
   useViewport,
 } from 'reactflow'
 import { useEventListener } from 'ahooks'
@@ -19,9 +18,9 @@ import CustomNode from './nodes'
 import CustomNoteNode from './note-node'
 import { CUSTOM_NOTE_NODE } from './note-node/constants'
 import { BlockEnum } from './types'
+import { useCollaborativeWorkflow } from '@/app/components/workflow/hooks/use-collaborative-workflow'
 
 const CandidateNode = () => {
-  const store = useStoreApi()
   const reactflow = useReactFlow()
   const workflowStore = useWorkflowStore()
   const candidateNode = useStore(s => s.candidateNode)
@@ -31,18 +30,15 @@ const CandidateNode = () => {
   const { saveStateToHistory } = useWorkflowHistory()
   const { handleSyncWorkflowDraft } = useNodesSyncDraft()
   const autoGenerateWebhookUrl = useAutoGenerateWebhookUrl()
+  const collaborativeWorkflow = useCollaborativeWorkflow()
 
   useEventListener('click', (e) => {
     const { candidateNode, mousePosition } = workflowStore.getState()
 
     if (candidateNode) {
       e.preventDefault()
-      const {
-        getNodes,
-        setNodes,
-      } = store.getState()
+      const { nodes, setNodes } = collaborativeWorkflow.getState()
       const { screenToFlowPosition } = reactflow
-      const nodes = getNodes()
       const { x, y } = screenToFlowPosition({ x: mousePosition.pageX, y: mousePosition.pageY })
       const newNodes = produce(nodes, (draft) => {
         draft.push({

web/app/components/workflow/collaboration/components/user-cursors.tsx

@@ -0,0 +1,78 @@
+import type { FC } from 'react'
+import { useViewport } from 'reactflow'
+import type { CursorPosition, OnlineUser } from '@/app/components/workflow/collaboration/types'
+import { getUserColor } from '../utils/user-color'
+
+type UserCursorsProps = {
+  cursors: Record<string, CursorPosition>
+  myUserId: string | null
+  onlineUsers: OnlineUser[]
+}
+
+const UserCursors: FC<UserCursorsProps> = ({
+  cursors,
+  myUserId,
+  onlineUsers,
+}) => {
+  const viewport = useViewport()
+
+  const convertToScreenCoordinates = (cursor: CursorPosition) => {
+    // Convert world coordinates to screen coordinates using current viewport
+    const screenX = cursor.x * viewport.zoom + viewport.x
+    const screenY = cursor.y * viewport.zoom + viewport.y
+
+    return { x: screenX, y: screenY }
+  }
+  return (
+    <>
+      {Object.entries(cursors || {}).map(([userId, cursor]) => {
+        if (userId === myUserId)
+          return null
+
+        const userInfo = onlineUsers.find(user => user.user_id === userId)
+        const userName = userInfo?.username || `User ${userId.slice(-4)}`
+        const userColor = getUserColor(userId)
+        const screenPos = convertToScreenCoordinates(cursor)
+
+        return (
+          <div
+            key={userId}
+            className="pointer-events-none absolute z-[8] transition-all duration-150 ease-out"
+            style={{
+              left: screenPos.x,
+              top: screenPos.y,
+            }}
+          >
+            <svg
+              width="20"
+              height="20"
+              viewBox="0 0 20 20"
+              fill="none"
+              xmlns="http://www.w3.org/2000/svg"
+              className="drop-shadow-md"
+            >
+              <path
+                d="M5 3L5 15L8 11.5L11 16L13 15L10 10.5L14 10.5L5 3Z"
+                fill={userColor}
+                stroke="white"
+                strokeWidth="1.5"
+                strokeLinejoin="round"
+              />
+            </svg>
+
+            <div
+              className="absolute left-4 top-4 max-w-[120px] overflow-hidden text-ellipsis whitespace-nowrap rounded px-1.5 py-0.5 text-[11px] font-medium text-white shadow-sm"
+              style={{
+                backgroundColor: userColor,
+              }}
+            >
+              {userName}
+            </div>
+          </div>
+        )
+      })}
+    </>
+  )
+}
+
+export default UserCursors

web/app/components/workflow/collaboration/core/__tests__/collaboration-manager.merge-behavior.test.ts

@@ -0,0 +1,239 @@
+import { LoroDoc } from 'loro-crdt'
+import { CollaborationManager } from '../collaboration-manager'
+import type { Node } from '@/app/components/workflow/types'
+import { BlockEnum } from '@/app/components/workflow/types'
+
+const NODE_ID = 'node-1'
+const LLM_NODE_ID = 'llm-node'
+const PARAM_NODE_ID = 'parameter-node'
+
+const createNode = (variables: string[]): Node => ({
+  id: NODE_ID,
+  type: 'custom',
+  position: { x: 0, y: 0 },
+  data: {
+    type: BlockEnum.Start,
+    title: 'Start',
+    desc: '',
+    variables: variables.map(name => ({
+      variable: name,
+      label: name,
+      type: 'text-input',
+      required: true,
+      default: '',
+      max_length: 48,
+      placeholder: '',
+      options: [],
+      hint: '',
+    })),
+  },
+})
+
+const createLLMNode = (templates: Array<{ id: string; role: string; text: string }>): Node => ({
+  id: LLM_NODE_ID,
+  type: 'custom',
+  position: { x: 200, y: 200 },
+  data: {
+    type: BlockEnum.LLM,
+    title: 'LLM',
+    selected: false,
+    model: {
+      mode: 'chat',
+      name: 'gemini-2.5-pro',
+      provider: 'langgenius/gemini/google',
+      completion_params: {
+        temperature: 0.7,
+      },
+    },
+    context: {
+      enabled: false,
+      variable_selector: [],
+    },
+    vision: {
+      enabled: false,
+    },
+    prompt_template: templates,
+  },
+})
+
+const createParameterExtractorNode = (parameters: Array<{ description: string; name: string; required: boolean; type: string }>): Node => ({
+  id: PARAM_NODE_ID,
+  type: 'custom',
+  position: { x: 400, y: 120 },
+  data: {
+    type: BlockEnum.ParameterExtractor,
+    title: 'ParameterExtractor',
+    selected: true,
+    model: {
+      mode: 'chat',
+      name: '',
+      provider: '',
+      completion_params: {
+        temperature: 0.7,
+      },
+    },
+    query: [],
+    reasoning_mode: 'prompt',
+    parameters,
+    vision: {
+      enabled: false,
+    },
+  },
+})
+
+const getManager = (doc: LoroDoc) => {
+  const manager = new CollaborationManager()
+  ;(manager as any).doc = doc
+  ;(manager as any).nodesMap = doc.getMap('nodes')
+  ;(manager as any).edgesMap = doc.getMap('edges')
+  return manager
+}
+
+const deepClone = <T>(value: T): T => JSON.parse(JSON.stringify(value))
+
+const exportNodes = (manager: CollaborationManager) => manager.getNodes()
+
+describe('Loro merge behavior smoke test', () => {
+  it('inspects concurrent edits after merge', () => {
+    const docA = new LoroDoc()
+    const managerA = getManager(docA)
+    managerA.syncNodes([], [createNode(['a'])])
+
+    const snapshot = docA.export({ mode: 'snapshot' })
+
+    const docB = LoroDoc.fromSnapshot(snapshot)
+    const managerB = getManager(docB)
+
+    managerA.syncNodes([createNode(['a'])], [createNode(['a', 'b'])])
+    managerB.syncNodes([createNode(['a'])], [createNode(['a', 'c'])])
+
+    const updateForA = docB.export({ mode: 'update', from: docA.version() })
+    docA.import(updateForA)
+
+    const updateForB = docA.export({ mode: 'update', from: docB.version() })
+    docB.import(updateForB)
+
+    const finalA = exportNodes(managerA)
+    const finalB = exportNodes(managerB)
+
+    console.log('Final nodes on docA:', JSON.stringify(finalA, null, 2))
+
+    console.log('Final nodes on docB:', JSON.stringify(finalB, null, 2))
+    expect(finalA.length).toBe(1)
+    expect(finalB.length).toBe(1)
+  })
+
+  it('merges prompt template insertions and edits across replicas', () => {
+    const baseTemplate = [
+      {
+        id: 'system-1',
+        role: 'system',
+        text: 'base instruction',
+      },
+    ]
+
+    const docA = new LoroDoc()
+    const managerA = getManager(docA)
+    managerA.syncNodes([], [createLLMNode(deepClone(baseTemplate))])
+
+    const snapshot = docA.export({ mode: 'snapshot' })
+    const docB = LoroDoc.fromSnapshot(snapshot)
+    const managerB = getManager(docB)
+
+    const additionTemplate = [
+      ...baseTemplate,
+      {
+        id: 'user-1',
+        role: 'user',
+        text: 'hello from docA',
+      },
+    ]
+    managerA.syncNodes([createLLMNode(deepClone(baseTemplate))], [createLLMNode(deepClone(additionTemplate))])
+
+    const editedTemplate = [
+      {
+        id: 'system-1',
+        role: 'system',
+        text: 'updated by docB',
+      },
+    ]
+    managerB.syncNodes([createLLMNode(deepClone(baseTemplate))], [createLLMNode(deepClone(editedTemplate))])
+
+    const updateForA = docB.export({ mode: 'update', from: docA.version() })
+    docA.import(updateForA)
+
+    const updateForB = docA.export({ mode: 'update', from: docB.version() })
+    docB.import(updateForB)
+
+    const finalA = exportNodes(managerA).find(node => node.id === LLM_NODE_ID)
+    const finalB = exportNodes(managerB).find(node => node.id === LLM_NODE_ID)
+
+    expect(finalA).toBeDefined()
+    expect(finalB).toBeDefined()
+
+    const expectedTemplates = [
+      {
+        id: 'system-1',
+        role: 'system',
+        text: 'updated by docB',
+      },
+      {
+        id: 'user-1',
+        role: 'user',
+        text: 'hello from docA',
+      },
+    ]
+
+    expect((finalA!.data as any).prompt_template).toEqual(expectedTemplates)
+    expect((finalB!.data as any).prompt_template).toEqual(expectedTemplates)
+  })
+
+  it('converges when parameter lists are edited concurrently', () => {
+    const baseParameters = [
+      { description: 'bb', name: 'aa', required: false, type: 'string' },
+      { description: 'dd', name: 'cc', required: false, type: 'string' },
+    ]
+
+    const docA = new LoroDoc()
+    const managerA = getManager(docA)
+    managerA.syncNodes([], [createParameterExtractorNode(deepClone(baseParameters))])
+
+    const snapshot = docA.export({ mode: 'snapshot' })
+    const docB = LoroDoc.fromSnapshot(snapshot)
+    const managerB = getManager(docB)
+
+    const docAUpdate = [
+      { description: 'bb updated by A', name: 'aa', required: true, type: 'string' },
+      { description: 'dd', name: 'cc', required: false, type: 'string' },
+      { description: 'new from A', name: 'ee', required: false, type: 'number' },
+    ]
+    managerA.syncNodes([createParameterExtractorNode(deepClone(baseParameters))], [createParameterExtractorNode(deepClone(docAUpdate))])
+
+    const docBUpdate = [
+      { description: 'bb', name: 'aa', required: false, type: 'string' },
+      { description: 'dd updated by B', name: 'cc', required: true, type: 'string' },
+    ]
+    managerB.syncNodes([createParameterExtractorNode(deepClone(baseParameters))], [createParameterExtractorNode(deepClone(docBUpdate))])
+
+    const updateForA = docB.export({ mode: 'update', from: docA.version() })
+    docA.import(updateForA)
+
+    const updateForB = docA.export({ mode: 'update', from: docB.version() })
+    docB.import(updateForB)
+
+    const finalA = exportNodes(managerA).find(node => node.id === PARAM_NODE_ID)
+    const finalB = exportNodes(managerB).find(node => node.id === PARAM_NODE_ID)
+
+    expect(finalA).toBeDefined()
+    expect(finalB).toBeDefined()
+
+    const expectedParameters = [
+      { description: 'bb updated by A', name: 'aa', required: true, type: 'string' },
+      { description: 'dd updated by B', name: 'cc', required: true, type: 'string' },
+      { description: 'new from A', name: 'ee', required: false, type: 'number' },
+    ]
+
+    expect((finalA!.data as any).parameters).toEqual(expectedParameters)
+    expect((finalB!.data as any).parameters).toEqual(expectedParameters)
+  })
+})

web/app/components/workflow/collaboration/core/__tests__/collaboration-manager.test.ts

@@ -0,0 +1,659 @@
+import { LoroDoc } from 'loro-crdt'
+import { CollaborationManager } from '@/app/components/workflow/collaboration/core/collaboration-manager'
+import { BlockEnum } from '@/app/components/workflow/types'
+import type { Edge, Node } from '@/app/components/workflow/types'
+import type { NodePanelPresenceMap, NodePanelPresenceUser } from '@/app/components/workflow/collaboration/types/collaboration'
+
+const NODE_ID = '1760342909316'
+
+type WorkflowVariable = {
+  default: string
+  hint: string
+  label: string
+  max_length: number
+  options: string[]
+  placeholder: string
+  required: boolean
+  type: string
+  variable: string
+}
+
+type PromptTemplateItem = {
+  id: string
+  role: string
+  text: string
+}
+
+type ParameterItem = {
+  description: string
+  name: string
+  required: boolean
+  type: string
+}
+
+const createVariable = (name: string, overrides: Partial<WorkflowVariable> = {}): WorkflowVariable => ({
+  default: '',
+  hint: '',
+  label: name,
+  max_length: 48,
+  options: [],
+  placeholder: '',
+  required: true,
+  type: 'text-input',
+  variable: name,
+  ...overrides,
+})
+
+const deepClone = <T>(value: T): T => JSON.parse(JSON.stringify(value))
+
+const createNodeSnapshot = (variableNames: string[]): Node<{ variables: WorkflowVariable[] }> => ({
+  id: NODE_ID,
+  type: 'custom',
+  position: { x: 0, y: 24 },
+  positionAbsolute: { x: 0, y: 24 },
+  height: 88,
+  width: 242,
+  selected: true,
+  selectable: true,
+  draggable: true,
+  sourcePosition: 'right',
+  targetPosition: 'left',
+  data: {
+    selected: true,
+    title: '开始',
+    desc: '',
+    type: BlockEnum.Start,
+    variables: variableNames.map(createVariable),
+  },
+})
+
+const LLM_NODE_ID = 'llm-node'
+const PARAM_NODE_ID = 'param-extractor-node'
+
+const createLLMNodeSnapshot = (promptTemplates: PromptTemplateItem[]): Node<any> => ({
+  id: LLM_NODE_ID,
+  type: 'custom',
+  position: { x: 200, y: 120 },
+  positionAbsolute: { x: 200, y: 120 },
+  height: 320,
+  width: 460,
+  selected: false,
+  selectable: true,
+  draggable: true,
+  sourcePosition: 'right',
+  targetPosition: 'left',
+  data: {
+    type: 'llm',
+    title: 'LLM',
+    selected: false,
+    context: {
+      enabled: false,
+      variable_selector: [],
+    },
+    model: {
+      mode: 'chat',
+      name: 'gemini-2.5-pro',
+      provider: 'langgenius/gemini/google',
+      completion_params: {
+        temperature: 0.7,
+      },
+    },
+    vision: {
+      enabled: false,
+    },
+    prompt_template: promptTemplates,
+  },
+})
+
+const createParameterExtractorNodeSnapshot = (parameters: ParameterItem[]): Node<any> => ({
+  id: PARAM_NODE_ID,
+  type: 'custom',
+  position: { x: 420, y: 220 },
+  positionAbsolute: { x: 420, y: 220 },
+  height: 260,
+  width: 420,
+  selected: true,
+  selectable: true,
+  draggable: true,
+  sourcePosition: 'right',
+  targetPosition: 'left',
+  data: {
+    type: 'parameter-extractor',
+    title: '参数提取器',
+    selected: true,
+    model: {
+      mode: 'chat',
+      name: '',
+      provider: '',
+      completion_params: {
+        temperature: 0.7,
+      },
+    },
+    reasoning_mode: 'prompt',
+    parameters,
+    query: [],
+    vision: {
+      enabled: false,
+    },
+  },
+})
+
+const getVariables = (node: Node): string[] => {
+  const variables = (node.data as any)?.variables ?? []
+  return variables.map((item: WorkflowVariable) => item.variable)
+}
+
+const getVariableObject = (node: Node, name: string): WorkflowVariable | undefined => {
+  const variables = (node.data as any)?.variables ?? []
+  return variables.find((item: WorkflowVariable) => item.variable === name)
+}
+
+const getPromptTemplates = (node: Node): PromptTemplateItem[] => {
+  return ((node.data as any)?.prompt_template ?? []) as PromptTemplateItem[]
+}
+
+const getParameters = (node: Node): ParameterItem[] => {
+  return ((node.data as any)?.parameters ?? []) as ParameterItem[]
+}
+
+describe('CollaborationManager syncNodes', () => {
+  let manager: CollaborationManager
+
+  beforeEach(() => {
+    manager = new CollaborationManager()
+    // Bypass private guards for targeted unit testing
+    const doc = new LoroDoc()
+    ;(manager as any).doc = doc
+    ;(manager as any).nodesMap = doc.getMap('nodes')
+    ;(manager as any).edgesMap = doc.getMap('edges')
+
+    const initialNode = createNodeSnapshot(['a'])
+    ;(manager as any).syncNodes([], [deepClone(initialNode)])
+  })
+
+  it('updates collaborators map when a single client adds a variable', () => {
+    const base = [createNodeSnapshot(['a'])]
+    const next = [createNodeSnapshot(['a', 'b'])]
+
+    ;(manager as any).syncNodes(base, next)
+
+    const stored = (manager.getNodes() as Node[]).find(node => node.id === NODE_ID)
+    expect(stored).toBeDefined()
+    expect(getVariables(stored!)).toEqual(['a', 'b'])
+  })
+
+  it('applies the latest parallel additions derived from the same base snapshot', () => {
+    const base = [createNodeSnapshot(['a'])]
+    const userA = [createNodeSnapshot(['a', 'b'])]
+    const userB = [createNodeSnapshot(['a', 'c'])]
+
+    ;(manager as any).syncNodes(base, userA)
+
+    const afterUserA = (manager.getNodes() as Node[]).find(node => node.id === NODE_ID)
+    expect(getVariables(afterUserA!)).toEqual(['a', 'b'])
+
+    ;(manager as any).syncNodes(base, userB)
+
+    const finalNode = (manager.getNodes() as Node[]).find(node => node.id === NODE_ID)
+    const finalVariables = getVariables(finalNode!)
+
+    expect(finalVariables).toEqual(['a', 'c'])
+  })
+
+  it('prefers the incoming mutation when the same variable is edited concurrently', () => {
+    const base = [createNodeSnapshot(['a'])]
+    const userA = [
+      {
+        ...createNodeSnapshot(['a']),
+        data: {
+          ...createNodeSnapshot(['a']).data,
+          variables: [
+            createVariable('a', { label: 'A from userA', hint: 'hintA' }),
+          ],
+        },
+      },
+    ]
+    const userB = [
+      {
+        ...createNodeSnapshot(['a']),
+        data: {
+          ...createNodeSnapshot(['a']).data,
+          variables: [
+            createVariable('a', { label: 'A from userB', hint: 'hintB' }),
+          ],
+        },
+      },
+    ]
+
+    ;(manager as any).syncNodes(base, userA)
+    ;(manager as any).syncNodes(base, userB)
+
+    const finalNode = (manager.getNodes() as Node[]).find(node => node.id === NODE_ID)
+    const finalVariable = getVariableObject(finalNode!, 'a')
+
+    expect(finalVariable?.label).toBe('A from userB')
+    expect(finalVariable?.hint).toBe('hintB')
+  })
+
+  it('reflects the last writer when concurrent removal and edits happen', () => {
+    const base = [createNodeSnapshot(['a', 'b'])]
+    ;(manager as any).syncNodes([], [deepClone(base[0])])
+    const userA = [
+      {
+        ...createNodeSnapshot(['a']),
+        data: {
+          ...createNodeSnapshot(['a']).data,
+          variables: [
+            createVariable('a', { label: 'A after deletion' }),
+          ],
+        },
+      },
+    ]
+    const userB = [
+      {
+        ...createNodeSnapshot(['a', 'b']),
+        data: {
+          ...createNodeSnapshot(['a']).data,
+          variables: [
+            createVariable('a'),
+            createVariable('b', { label: 'B edited but should vanish' }),
+          ],
+        },
+      },
+    ]
+
+    ;(manager as any).syncNodes(base, userA)
+    ;(manager as any).syncNodes(base, userB)
+
+    const finalNode = (manager.getNodes() as Node[]).find(node => node.id === NODE_ID)
+    const finalVariables = getVariables(finalNode!)
+    expect(finalVariables).toEqual(['a', 'b'])
+    expect(getVariableObject(finalNode!, 'b')).toBeDefined()
+  })
+
+  it('synchronizes prompt_template list updates across collaborators', () => {
+    const promptManager = new CollaborationManager()
+    const doc = new LoroDoc()
+    ;(promptManager as any).doc = doc
+    ;(promptManager as any).nodesMap = doc.getMap('nodes')
+    ;(promptManager as any).edgesMap = doc.getMap('edges')
+
+    const baseTemplate = [
+      {
+        id: 'abcfa5f9-3c44-4252-aeba-4b6eaf0acfc4',
+        role: 'system',
+        text: 'avc',
+      },
+    ]
+
+    const baseNode = createLLMNodeSnapshot(baseTemplate)
+    ;(promptManager as any).syncNodes([], [deepClone(baseNode)])
+
+    const updatedTemplates = [
+      ...baseTemplate,
+      {
+        id: 'user-1',
+        role: 'user',
+        text: 'hello world',
+      },
+    ]
+
+    const updatedNode = createLLMNodeSnapshot(updatedTemplates)
+    ;(promptManager as any).syncNodes([deepClone(baseNode)], [deepClone(updatedNode)])
+
+    const stored = (promptManager.getNodes() as Node[]).find(node => node.id === LLM_NODE_ID)
+    expect(stored).toBeDefined()
+
+    const storedTemplates = getPromptTemplates(stored!)
+    expect(storedTemplates).toHaveLength(2)
+    expect(storedTemplates[0]).toEqual(baseTemplate[0])
+    expect(storedTemplates[1]).toEqual(updatedTemplates[1])
+
+    const editedTemplates = [
+      {
+        id: 'abcfa5f9-3c44-4252-aeba-4b6eaf0acfc4',
+        role: 'system',
+        text: 'updated system prompt',
+      },
+    ]
+    const editedNode = createLLMNodeSnapshot(editedTemplates)
+
+    ;(promptManager as any).syncNodes([deepClone(updatedNode)], [deepClone(editedNode)])
+
+    const final = (promptManager.getNodes() as Node[]).find(node => node.id === LLM_NODE_ID)
+    const finalTemplates = getPromptTemplates(final!)
+    expect(finalTemplates).toHaveLength(1)
+    expect(finalTemplates[0].text).toBe('updated system prompt')
+  })
+
+  it('keeps parameter list in sync when nodes add, edit, or remove parameters', () => {
+    const parameterManager = new CollaborationManager()
+    const doc = new LoroDoc()
+    ;(parameterManager as any).doc = doc
+    ;(parameterManager as any).nodesMap = doc.getMap('nodes')
+    ;(parameterManager as any).edgesMap = doc.getMap('edges')
+
+    const baseParameters: ParameterItem[] = [
+      { description: 'bb', name: 'aa', required: false, type: 'string' },
+      { description: 'dd', name: 'cc', required: false, type: 'string' },
+    ]
+
+    const baseNode = createParameterExtractorNodeSnapshot(baseParameters)
+    ;(parameterManager as any).syncNodes([], [deepClone(baseNode)])
+
+    const updatedParameters: ParameterItem[] = [
+      ...baseParameters,
+      { description: 'ff', name: 'ee', required: true, type: 'number' },
+    ]
+
+    const updatedNode = createParameterExtractorNodeSnapshot(updatedParameters)
+    ;(parameterManager as any).syncNodes([deepClone(baseNode)], [deepClone(updatedNode)])
+
+    const stored = (parameterManager.getNodes() as Node[]).find(node => node.id === PARAM_NODE_ID)
+    expect(stored).toBeDefined()
+    expect(getParameters(stored!)).toEqual(updatedParameters)
+
+    const editedParameters: ParameterItem[] = [
+      { description: 'bb edited', name: 'aa', required: true, type: 'string' },
+    ]
+    const editedNode = createParameterExtractorNodeSnapshot(editedParameters)
+
+    ;(parameterManager as any).syncNodes([deepClone(updatedNode)], [deepClone(editedNode)])
+
+    const final = (parameterManager.getNodes() as Node[]).find(node => node.id === PARAM_NODE_ID)
+    expect(getParameters(final!)).toEqual(editedParameters)
+  })
+
+  it('handles nodes without data gracefully', () => {
+    const emptyNode: Node = {
+      id: 'empty-node',
+      type: 'custom',
+      position: { x: 0, y: 0 },
+      data: undefined as any,
+    }
+
+    ;(manager as any).syncNodes([], [deepClone(emptyNode)])
+
+    const stored = (manager.getNodes() as Node[]).find(node => node.id === 'empty-node')
+    expect(stored).toBeDefined()
+    expect(stored?.data).toEqual({})
+  })
+
+  it('preserves CRDT list instances when synchronizing parsed state back into the manager', () => {
+    const promptManager = new CollaborationManager()
+    const doc = new LoroDoc()
+    ;(promptManager as any).doc = doc
+    ;(promptManager as any).nodesMap = doc.getMap('nodes')
+    ;(promptManager as any).edgesMap = doc.getMap('edges')
+
+    const base = createLLMNodeSnapshot([
+      { id: 'system', role: 'system', text: 'base' },
+    ])
+    ;(promptManager as any).syncNodes([], [deepClone(base)])
+
+    const storedBefore = promptManager.getNodes().find(node => node.id === LLM_NODE_ID)
+    const firstTemplate = (storedBefore?.data as any).prompt_template?.[0]
+    expect(firstTemplate?.text).toBe('base')
+
+    // simulate consumer mutating the plain JSON array and syncing back
+    const mutatedNode = deepClone(storedBefore!)
+    mutatedNode.data.prompt_template.push({
+      id: 'user',
+      role: 'user',
+      text: 'mutated',
+    })
+
+    ;(promptManager as any).syncNodes([storedBefore], [mutatedNode])
+
+    const storedAfter = promptManager.getNodes().find(node => node.id === LLM_NODE_ID)
+    const templatesAfter = (storedAfter?.data as any).prompt_template
+    expect(Array.isArray(templatesAfter)).toBe(true)
+    expect(templatesAfter).toHaveLength(2)
+  })
+
+  it('reuses CRDT list when syncing parameters repeatedly', () => {
+    const parameterManager = new CollaborationManager()
+    const doc = new LoroDoc()
+    ;(parameterManager as any).doc = doc
+    ;(parameterManager as any).nodesMap = doc.getMap('nodes')
+    ;(parameterManager as any).edgesMap = doc.getMap('edges')
+
+    const initialParameters: ParameterItem[] = [
+      { description: 'desc', name: 'param', required: false, type: 'string' },
+    ]
+    const node = createParameterExtractorNodeSnapshot(initialParameters)
+    ;(parameterManager as any).syncNodes([], [deepClone(node)])
+
+    const stored = parameterManager.getNodes().find(n => n.id === PARAM_NODE_ID)!
+    const mutatedNode = deepClone(stored)
+    mutatedNode.data.parameters[0].description = 'updated'
+
+    ;(parameterManager as any).syncNodes([stored], [mutatedNode])
+
+    const storedAfter = parameterManager.getNodes().find(n => n.id === PARAM_NODE_ID)!
+    const params = (storedAfter.data as any).parameters
+    expect(params).toHaveLength(1)
+    expect(params[0].description).toBe('updated')
+  })
+
+  it('filters out transient/private data keys while keeping allowlisted ones', () => {
+    const nodeWithPrivate: Node = {
+      id: 'private-node',
+      type: 'custom',
+      position: { x: 0, y: 0 },
+      data: {
+        type: BlockEnum.Start,
+        _foo: 'should disappear',
+        _children: ['child-a'],
+        selected: true,
+        variables: [],
+      },
+    }
+
+    ;(manager as any).syncNodes([], [deepClone(nodeWithPrivate)])
+
+    const stored = (manager.getNodes() as Node[]).find(node => node.id === 'private-node')!
+    expect((stored.data as any)._foo).toBeUndefined()
+    expect((stored.data as any)._children).toEqual(['child-a'])
+    expect((stored.data as any).selected).toBeUndefined()
+  })
+
+  it('removes list fields when they are omitted in the update snapshot', () => {
+    const baseNode = createNodeSnapshot(['alpha'])
+    ;(manager as any).syncNodes([], [deepClone(baseNode)])
+
+    const withoutVariables: Node = {
+      ...deepClone(baseNode),
+      data: {
+        ...deepClone(baseNode).data,
+      },
+    }
+    delete (withoutVariables.data as any).variables
+
+    ;(manager as any).syncNodes([deepClone(baseNode)], [withoutVariables])
+
+    const stored = (manager.getNodes() as Node[]).find(node => node.id === NODE_ID)!
+    expect((stored.data as any).variables).toBeUndefined()
+  })
+
+  it('treats non-array list inputs as empty lists during synchronization', () => {
+    const promptManager = new CollaborationManager()
+    const doc = new LoroDoc()
+    ;(promptManager as any).doc = doc
+    ;(promptManager as any).nodesMap = doc.getMap('nodes')
+    ;(promptManager as any).edgesMap = doc.getMap('edges')
+
+    const nodeWithInvalidTemplate = createLLMNodeSnapshot([] as any)
+    ;(promptManager as any).syncNodes([], [deepClone(nodeWithInvalidTemplate)])
+
+    const mutated = deepClone(nodeWithInvalidTemplate)
+    ;(mutated.data as any).prompt_template = 'not-an-array'
+
+    ;(promptManager as any).syncNodes([deepClone(nodeWithInvalidTemplate)], [mutated])
+
+    const stored = promptManager.getNodes().find(node => node.id === LLM_NODE_ID)!
+    expect(Array.isArray((stored.data as any).prompt_template)).toBe(true)
+    expect((stored.data as any).prompt_template).toHaveLength(0)
+  })
+
+  it('updates edges map when edges are added, modified, and removed', () => {
+    const edgeManager = new CollaborationManager()
+    const doc = new LoroDoc()
+    ;(edgeManager as any).doc = doc
+    ;(edgeManager as any).nodesMap = doc.getMap('nodes')
+    ;(edgeManager as any).edgesMap = doc.getMap('edges')
+
+    const edge: Edge = {
+      id: 'edge-1',
+      source: 'node-a',
+      target: 'node-b',
+      type: 'default',
+      data: { label: 'initial' },
+    } as Edge
+
+    ;(edgeManager as any).setEdges([], [edge])
+    expect(edgeManager.getEdges()).toHaveLength(1)
+    expect((edgeManager.getEdges()[0].data as any).label).toBe('initial')
+
+    const updatedEdge: Edge = {
+      ...edge,
+      data: { label: 'updated' },
+    }
+    ;(edgeManager as any).setEdges([edge], [updatedEdge])
+    expect(edgeManager.getEdges()).toHaveLength(1)
+    expect((edgeManager.getEdges()[0].data as any).label).toBe('updated')
+
+    ;(edgeManager as any).setEdges([updatedEdge], [])
+    expect(edgeManager.getEdges()).toHaveLength(0)
+  })
+})
+
+describe('CollaborationManager public API wrappers', () => {
+  let manager: CollaborationManager
+  const baseNodes: Node[] = []
+  const updatedNodes: Node[] = [
+    { id: 'new-node', type: 'custom', position: { x: 0, y: 0 }, data: {} } as Node,
+  ]
+  const baseEdges: Edge[] = []
+  const updatedEdges: Edge[] = [
+    { id: 'edge-1', source: 'source', target: 'target', type: 'default', data: {} } as Edge,
+  ]
+
+  beforeEach(() => {
+    manager = new CollaborationManager()
+  })
+
+  it('setNodes delegates to syncNodes and commits the CRDT document', () => {
+    const commit = jest.fn()
+    ;(manager as any).doc = { commit }
+    const syncSpy = jest.spyOn(manager as any, 'syncNodes').mockImplementation(() => undefined)
+
+    manager.setNodes(baseNodes, updatedNodes)
+
+    expect(syncSpy).toHaveBeenCalledWith(baseNodes, updatedNodes)
+    expect(commit).toHaveBeenCalled()
+    syncSpy.mockRestore()
+  })
+
+  it('setNodes skips syncing when undo/redo replay is running', () => {
+    const commit = jest.fn()
+    ;(manager as any).doc = { commit }
+    ;(manager as any).isUndoRedoInProgress = true
+    const syncSpy = jest.spyOn(manager as any, 'syncNodes').mockImplementation(() => undefined)
+
+    manager.setNodes(baseNodes, updatedNodes)
+
+    expect(syncSpy).not.toHaveBeenCalled()
+    expect(commit).not.toHaveBeenCalled()
+    syncSpy.mockRestore()
+  })
+
+  it('setEdges delegates to syncEdges and commits the CRDT document', () => {
+    const commit = jest.fn()
+    ;(manager as any).doc = { commit }
+    const syncSpy = jest.spyOn(manager as any, 'syncEdges').mockImplementation(() => undefined)
+
+    manager.setEdges(baseEdges, updatedEdges)
+
+    expect(syncSpy).toHaveBeenCalledWith(baseEdges, updatedEdges)
+    expect(commit).toHaveBeenCalled()
+    syncSpy.mockRestore()
+  })
+
+  it('disconnect tears down the collaboration state only when last connection closes', () => {
+    const forceSpy = jest.spyOn(manager as any, 'forceDisconnect').mockImplementation(() => undefined)
+    ;(manager as any).activeConnections.add('conn-a')
+    ;(manager as any).activeConnections.add('conn-b')
+
+    manager.disconnect('conn-a')
+    expect(forceSpy).not.toHaveBeenCalled()
+
+    manager.disconnect('conn-b')
+    expect(forceSpy).toHaveBeenCalledTimes(1)
+    forceSpy.mockRestore()
+  })
+
+  it('applyNodePanelPresenceUpdate keeps a client visible on a single node at a time', () => {
+    const updates: NodePanelPresenceMap[] = []
+    manager.onNodePanelPresenceUpdate((presence) => {
+      updates.push(presence)
+    })
+
+    const user: NodePanelPresenceUser = { userId: 'user-1', username: 'Dana' }
+
+    ;(manager as any).applyNodePanelPresenceUpdate({
+      nodeId: 'node-a',
+      action: 'open',
+      user,
+      clientId: 'client-1',
+      timestamp: 100,
+    })
+
+    ;(manager as any).applyNodePanelPresenceUpdate({
+      nodeId: 'node-b',
+      action: 'open',
+      user,
+      clientId: 'client-1',
+      timestamp: 200,
+    })
+
+    const finalSnapshot = updates[updates.length - 1]!
+    expect(finalSnapshot).toEqual({
+      'node-b': {
+        'client-1': {
+          userId: 'user-1',
+          username: 'Dana',
+          clientId: 'client-1',
+          timestamp: 200,
+        },
+      },
+    })
+  })
+
+  it('applyNodePanelPresenceUpdate clears node entries when last viewer closes the panel', () => {
+    const updates: NodePanelPresenceMap[] = []
+    manager.onNodePanelPresenceUpdate((presence) => {
+      updates.push(presence)
+    })
+
+    const user: NodePanelPresenceUser = { userId: 'user-2', username: 'Kai' }
+
+    ;(manager as any).applyNodePanelPresenceUpdate({
+      nodeId: 'node-a',
+      action: 'open',
+      user,
+      clientId: 'client-9',
+      timestamp: 300,
+    })
+
+    ;(manager as any).applyNodePanelPresenceUpdate({
+      nodeId: 'node-a',
+      action: 'close',
+      user,
+      clientId: 'client-9',
+      timestamp: 301,
+    })
+
+    expect(updates[updates.length - 1]).toEqual({})
+  })
+})

web/app/components/workflow/collaboration/core/__tests__/crdt-provider.test.ts

@@ -0,0 +1,121 @@
+import type { Socket } from 'socket.io-client'
+import { CRDTProvider } from '../crdt-provider'
+
+type FakeDoc = {
+  export: jest.Mock<Uint8Array, [options?: { mode?: string }]>
+  import: jest.Mock<void, [Uint8Array]>
+  subscribe: jest.Mock<void, [(payload: any) => void]>
+  trigger: (event: any) => void
+}
+
+const createFakeDoc = (): FakeDoc => {
+  let handler: ((payload: any) => void) | null = null
+
+  return {
+    export: jest.fn(() => new Uint8Array([1, 2, 3])),
+    import: jest.fn(),
+    subscribe: jest.fn((cb: (payload: any) => void) => {
+      handler = cb
+    }),
+    trigger: (event: any) => {
+      handler?.(event)
+    },
+  }
+}
+
+const createMockSocket = () => {
+  const handlers = new Map<string, (...args: any[]) => void>()
+
+  const socket: any = {
+    emit: jest.fn(),
+    on: jest.fn((event: string, handler: (...args: any[]) => void) => {
+      handlers.set(event, handler)
+    }),
+    off: jest.fn((event: string) => {
+      handlers.delete(event)
+    }),
+    trigger: (event: string, ...args: any[]) => {
+      const handler = handlers.get(event)
+      if (handler)
+        handler(...args)
+    },
+  }
+
+  return socket as Socket & { trigger: (event: string, ...args: any[]) => void }
+}
+
+describe('CRDTProvider', () => {
+  it('emits graph_event when local changes happen', () => {
+    const doc = createFakeDoc()
+    const socket = createMockSocket()
+
+    const provider = new CRDTProvider(socket, doc as unknown as any)
+    expect(provider).toBeInstanceOf(CRDTProvider)
+
+    doc.trigger({ by: 'local' })
+
+    expect(socket.emit).toHaveBeenCalledWith(
+      'graph_event',
+      expect.any(Uint8Array),
+    )
+    expect(doc.export).toHaveBeenCalledWith({ mode: 'update' })
+  })
+
+  it('ignores non-local events', () => {
+    const doc = createFakeDoc()
+    const socket = createMockSocket()
+
+    const provider = new CRDTProvider(socket, doc as unknown as any)
+
+    doc.trigger({ by: 'remote' })
+
+    expect(socket.emit).not.toHaveBeenCalled()
+    provider.destroy()
+  })
+
+  it('imports remote updates on graph_update', () => {
+    const doc = createFakeDoc()
+    const socket = createMockSocket()
+
+    const provider = new CRDTProvider(socket, doc as unknown as any)
+
+    const payload = new Uint8Array([9, 9, 9])
+    socket.trigger('graph_update', payload)
+
+    expect(doc.import).toHaveBeenCalledWith(expect.any(Uint8Array))
+    expect(Array.from(doc.import.mock.calls[0][0])).toEqual([9, 9, 9])
+    provider.destroy()
+  })
+
+  it('removes graph_update listener on destroy', () => {
+    const doc = createFakeDoc()
+    const socket = createMockSocket()
+
+    const provider = new CRDTProvider(socket, doc as unknown as any)
+    provider.destroy()
+
+    expect(socket.off).toHaveBeenCalledWith('graph_update')
+  })
+
+  it('logs an error when graph_update import fails but continues operating', () => {
+    const doc = createFakeDoc()
+    const socket = createMockSocket()
+    doc.import.mockImplementation(() => {
+      throw new Error('boom')
+    })
+
+    const provider = new CRDTProvider(socket, doc as unknown as any)
+
+    const errorSpy = jest.spyOn(console, 'error').mockImplementation(() => undefined)
+
+    socket.trigger('graph_update', new Uint8Array([1]))
+    expect(errorSpy).toHaveBeenCalledWith('Error importing graph update:', expect.any(Error))
+
+    doc.import.mockReset()
+    socket.trigger('graph_update', new Uint8Array([2, 3]))
+    expect(doc.import).toHaveBeenCalled()
+
+    provider.destroy()
+    errorSpy.mockRestore()
+  })
+})

web/app/components/workflow/collaboration/core/__tests__/event-emitter.test.ts

@@ -0,0 +1,93 @@
+import { EventEmitter } from '../event-emitter'
+
+describe('EventEmitter', () => {
+  it('registers and invokes handlers via on/emit', () => {
+    const emitter = new EventEmitter()
+    const handler = jest.fn()
+
+    emitter.on('test', handler)
+    emitter.emit('test', { value: 42 })
+
+    expect(handler).toHaveBeenCalledWith({ value: 42 })
+  })
+
+  it('removes specific handler with off', () => {
+    const emitter = new EventEmitter()
+    const handlerA = jest.fn()
+    const handlerB = jest.fn()
+
+    emitter.on('test', handlerA)
+    emitter.on('test', handlerB)
+
+    emitter.off('test', handlerA)
+    emitter.emit('test', 'payload')
+
+    expect(handlerA).not.toHaveBeenCalled()
+    expect(handlerB).toHaveBeenCalledWith('payload')
+  })
+
+  it('clears all listeners when off is called without handler', () => {
+    const emitter = new EventEmitter()
+    const handlerA = jest.fn()
+    const handlerB = jest.fn()
+
+    emitter.on('trigger', handlerA)
+    emitter.on('trigger', handlerB)
+
+    emitter.off('trigger')
+    emitter.emit('trigger', 'payload')
+
+    expect(handlerA).not.toHaveBeenCalled()
+    expect(handlerB).not.toHaveBeenCalled()
+    expect(emitter.getListenerCount('trigger')).toBe(0)
+  })
+
+  it('removeAllListeners clears every registered event', () => {
+    const emitter = new EventEmitter()
+    emitter.on('one', jest.fn())
+    emitter.on('two', jest.fn())
+
+    emitter.removeAllListeners()
+
+    expect(emitter.getListenerCount('one')).toBe(0)
+    expect(emitter.getListenerCount('two')).toBe(0)
+  })
+
+  it('returns an unsubscribe function from on', () => {
+    const emitter = new EventEmitter()
+    const handler = jest.fn()
+
+    const unsubscribe = emitter.on('detach', handler)
+    unsubscribe()
+
+    emitter.emit('detach', 'value')
+
+    expect(handler).not.toHaveBeenCalled()
+  })
+
+  it('continues emitting when a handler throws', () => {
+    const emitter = new EventEmitter()
+    const errorHandler = jest
+      .spyOn(console, 'error')
+      .mockImplementation()
+
+    const failingHandler = jest.fn(() => {
+      throw new Error('boom')
+    })
+    const succeedingHandler = jest.fn()
+
+    emitter.on('safe', failingHandler)
+    emitter.on('safe', succeedingHandler)
+
+    emitter.emit('safe', 7)
+
+    expect(failingHandler).toHaveBeenCalledWith(7)
+    expect(succeedingHandler).toHaveBeenCalledWith(7)
+    expect(errorHandler).toHaveBeenCalledWith(
+      expect.stringContaining('Error in event handler for safe:'),
+      expect.any(Error),
+    )
+
+    errorHandler.mockRestore()
+  })
+})

web/app/components/workflow/collaboration/core/__tests__/websocket-manager.test.ts

@@ -0,0 +1,165 @@
+import type { Socket } from 'socket.io-client'
+
+const ioMock = jest.fn()
+
+jest.mock('socket.io-client', () => ({
+  io: (...args: any[]) => ioMock(...args),
+}))
+
+const createMockSocket = (id: string): Socket & {
+  trigger: (event: string, ...args: any[]) => void
+} => {
+  const handlers = new Map<string, (...args: any[]) => void>()
+
+  const socket: any = {
+    id,
+    connected: true,
+    emit: jest.fn(),
+    disconnect: jest.fn(() => {
+      socket.connected = false
+    }),
+    on: jest.fn((event: string, handler: (...args: any[]) => void) => {
+      handlers.set(event, handler)
+    }),
+    trigger: (event: string, ...args: any[]) => {
+      const handler = handlers.get(event)
+      if (handler)
+        handler(...args)
+    },
+  }
+
+  return socket as Socket & { trigger: (event: string, ...args: any[]) => void }
+}
+
+describe('WebSocketClient', () => {
+  let originalWindow: typeof window | undefined
+
+  beforeEach(() => {
+    jest.resetModules()
+    ioMock.mockReset()
+    originalWindow = globalThis.window
+  })
+
+  afterEach(() => {
+    if (originalWindow)
+      globalThis.window = originalWindow
+    else
+      delete (globalThis as any).window
+  })
+
+  it('connects with fallback url and registers base listeners when window is undefined', async () => {
+    delete (globalThis as any).window
+
+    const mockSocket = createMockSocket('socket-fallback')
+    ioMock.mockImplementation(() => mockSocket)
+
+    const { WebSocketClient } = await import('../websocket-manager')
+    const client = new WebSocketClient()
+    const socket = client.connect('app-1')
+
+    expect(ioMock).toHaveBeenCalledWith(
+      'ws://localhost:5001',
+      expect.objectContaining({
+        path: '/socket.io',
+        transports: ['websocket'],
+        withCredentials: true,
+      }),
+    )
+    expect(socket).toBe(mockSocket)
+    expect(mockSocket.on).toHaveBeenCalledWith('connect', expect.any(Function))
+    expect(mockSocket.on).toHaveBeenCalledWith('disconnect', expect.any(Function))
+    expect(mockSocket.on).toHaveBeenCalledWith('connect_error', expect.any(Function))
+  })
+
+  it('reuses existing connected socket and avoids duplicate connections', async () => {
+    const mockSocket = createMockSocket('socket-reuse')
+    ioMock.mockImplementation(() => mockSocket)
+
+    const { WebSocketClient } = await import('../websocket-manager')
+    const client = new WebSocketClient()
+
+    const first = client.connect('app-reuse')
+    const second = client.connect('app-reuse')
+
+    expect(ioMock).toHaveBeenCalledTimes(1)
+    expect(second).toBe(first)
+  })
+
+  it('attaches auth token from localStorage and emits user_connect on connect', async () => {
+    const mockSocket = createMockSocket('socket-auth')
+    ioMock.mockImplementation((url, options) => {
+      expect(options.auth).toEqual({ token: 'secret-token' })
+      return mockSocket
+    })
+
+    globalThis.window = {
+      location: { protocol: 'https:', host: 'example.com' },
+      localStorage: {
+        getItem: jest.fn(() => 'secret-token'),
+      },
+    } as unknown as typeof window
+
+    const { WebSocketClient } = await import('../websocket-manager')
+    const client = new WebSocketClient()
+    client.connect('app-auth')
+
+    const connectHandler = mockSocket.on.mock.calls.find(call => call[0] === 'connect')?.[1] as () => void
+    expect(connectHandler).toBeDefined()
+    connectHandler()
+
+    expect(mockSocket.emit).toHaveBeenCalledWith('user_connect', { workflow_id: 'app-auth' })
+  })
+
+  it('disconnects a specific app and clears internal maps', async () => {
+    const mockSocket = createMockSocket('socket-disconnect-one')
+    ioMock.mockImplementation(() => mockSocket)
+
+    const { WebSocketClient } = await import('../websocket-manager')
+    const client = new WebSocketClient()
+    client.connect('app-disconnect')
+
+    expect(client.isConnected('app-disconnect')).toBe(true)
+    client.disconnect('app-disconnect')
+
+    expect(mockSocket.disconnect).toHaveBeenCalled()
+    expect(client.getSocket('app-disconnect')).toBeNull()
+    expect(client.isConnected('app-disconnect')).toBe(false)
+  })
+
+  it('disconnects all apps when no id is provided', async () => {
+    const socketA = createMockSocket('socket-a')
+    const socketB = createMockSocket('socket-b')
+    ioMock.mockImplementationOnce(() => socketA).mockImplementationOnce(() => socketB)
+
+    const { WebSocketClient } = await import('../websocket-manager')
+    const client = new WebSocketClient()
+    client.connect('app-a')
+    client.connect('app-b')
+
+    client.disconnect()
+
+    expect(socketA.disconnect).toHaveBeenCalled()
+    expect(socketB.disconnect).toHaveBeenCalled()
+    expect(client.getConnectedApps()).toEqual([])
+  })
+
+  it('reports connected apps, sockets, and debug info correctly', async () => {
+    const socketA = createMockSocket('socket-debug-a')
+    const socketB = createMockSocket('socket-debug-b')
+    socketB.connected = false
+    ioMock.mockImplementationOnce(() => socketA).mockImplementationOnce(() => socketB)
+
+    const { WebSocketClient } = await import('../websocket-manager')
+    const client = new WebSocketClient()
+    client.connect('app-a')
+    client.connect('app-b')
+
+    expect(client.getConnectedApps()).toEqual(['app-a'])
+
+    const debugInfo = client.getDebugInfo()
+    expect(debugInfo).toMatchObject({
+      'app-a': { connected: true, socketId: 'socket-debug-a' },
+      'app-b': { connected: false, socketId: 'socket-debug-b' },
+    })
+  })
+})

web/app/components/workflow/collaboration/core/crdt-provider.ts

@@ -0,0 +1,39 @@
+import type { LoroDoc } from 'loro-crdt'
+import type { Socket } from 'socket.io-client'
+import { emitWithAuthGuard } from './websocket-manager'
+
+export class CRDTProvider {
+  private doc: LoroDoc
+  private socket: Socket
+  private onUnauthorized?: () => void
+
+  constructor(socket: Socket, doc: LoroDoc, onUnauthorized?: () => void) {
+    this.socket = socket
+    this.doc = doc
+    this.onUnauthorized = onUnauthorized
+    this.setupEventListeners()
+  }
+
+  private setupEventListeners(): void {
+    this.doc.subscribe((event: any) => {
+      if (event.by === 'local') {
+        const update = this.doc.export({ mode: 'update' })
+        emitWithAuthGuard(this.socket, 'graph_event', update, { onUnauthorized: this.onUnauthorized })
+      }
+    })
+
+    this.socket.on('graph_update', (updateData: Uint8Array) => {
+      try {
+        const data = new Uint8Array(updateData)
+        this.doc.import(data)
+      }
+      catch (error) {
+        console.error('Error importing graph update:', error)
+      }
+    })
+  }
+
+  destroy(): void {
+    this.socket.off('graph_update')
+  }
+}

web/app/components/workflow/collaboration/core/event-emitter.ts

@@ -0,0 +1,49 @@
+export type EventHandler<T = any> = (data: T) => void
+
+export class EventEmitter {
+  private events: Map<string, Set<EventHandler>> = new Map()
+
+  on<T = any>(event: string, handler: EventHandler<T>): () => void {
+    if (!this.events.has(event))
+      this.events.set(event, new Set())
+
+    this.events.get(event)!.add(handler)
+
+    return () => this.off(event, handler)
+  }
+
+  off<T = any>(event: string, handler?: EventHandler<T>): void {
+    if (!this.events.has(event)) return
+
+    const handlers = this.events.get(event)!
+    if (handler)
+      handlers.delete(handler)
+    else
+      handlers.clear()
+
+    if (handlers.size === 0)
+      this.events.delete(event)
+  }
+
+  emit<T = any>(event: string, data: T): void {
+    if (!this.events.has(event)) return
+
+    const handlers = this.events.get(event)!
+    handlers.forEach((handler) => {
+      try {
+        handler(data)
+      }
+      catch (error) {
+        console.error(`Error in event handler for ${event}:`, error)
+      }
+    })
+  }
+
+  removeAllListeners(): void {
+    this.events.clear()
+  }
+
+  getListenerCount(event: string): number {
+    return this.events.get(event)?.size || 0
+  }
+}

web/app/components/workflow/collaboration/core/websocket-manager.ts

@@ -0,0 +1,168 @@
+import type { Socket } from 'socket.io-client'
+import { io } from 'socket.io-client'
+import { ACCESS_TOKEN_LOCAL_STORAGE_NAME } from '@/config'
+import type { DebugInfo, WebSocketConfig } from '../types/websocket'
+
+const isUnauthorizedAck = (...ackArgs: any[]): boolean => {
+  const [first, second] = ackArgs
+
+  if (second === 401 || first === 401)
+    return true
+
+  if (first && typeof first === 'object' && first.msg === 'unauthorized')
+    return true
+
+  return false
+}
+
+export type EmitAckOptions = {
+  onAck?: (...ackArgs: any[]) => void
+  onUnauthorized?: (...ackArgs: any[]) => void
+}
+
+export const emitWithAuthGuard = (
+  socket: Socket | null | undefined,
+  event: string,
+  payload: any,
+  options?: EmitAckOptions,
+): void => {
+  if (!socket)
+    return
+
+  socket.emit(
+    event,
+    payload,
+    (...ackArgs: any[]) => {
+      options?.onAck?.(...ackArgs)
+      if (isUnauthorizedAck(...ackArgs))
+        options?.onUnauthorized?.(...ackArgs)
+    },
+  )
+}
+
+export class WebSocketClient {
+  private connections: Map<string, Socket> = new Map()
+  private connecting: Set<string> = new Set()
+  private config: WebSocketConfig
+
+  constructor(config: WebSocketConfig = {}) {
+    const inferUrl = () => {
+      if (typeof window === 'undefined')
+        return 'ws://localhost:5001'
+      const scheme = window.location.protocol === 'https:' ? 'wss:' : 'ws:'
+      return `${scheme}//${window.location.host}`
+    }
+    this.config = {
+      url: config.url || process.env.NEXT_PUBLIC_SOCKET_URL || inferUrl(),
+      transports: config.transports || ['websocket'],
+      withCredentials: config.withCredentials !== false,
+      ...config,
+    }
+  }
+
+  connect(appId: string): Socket {
+    const existingSocket = this.connections.get(appId)
+    if (existingSocket?.connected)
+      return existingSocket
+
+    if (this.connecting.has(appId)) {
+      const pendingSocket = this.connections.get(appId)
+      if (pendingSocket)
+        return pendingSocket
+    }
+
+    if (existingSocket && !existingSocket.connected) {
+      existingSocket.disconnect()
+      this.connections.delete(appId)
+    }
+
+    this.connecting.add(appId)
+
+    const authToken = typeof window === 'undefined'
+      ? undefined
+      : window.localStorage.getItem(ACCESS_TOKEN_LOCAL_STORAGE_NAME) ?? undefined
+
+    const socketOptions: {
+      path: string
+      transports: WebSocketConfig['transports']
+      withCredentials?: boolean
+      auth?: { token: string }
+    } = {
+      path: '/socket.io',
+      transports: this.config.transports,
+      withCredentials: this.config.withCredentials,
+    }
+
+    if (authToken)
+      socketOptions.auth = { token: authToken }
+
+    const socket = io(this.config.url!, socketOptions)
+
+    this.connections.set(appId, socket)
+    this.setupBaseEventListeners(socket, appId)
+
+    return socket
+  }
+
+  disconnect(appId?: string): void {
+    if (appId) {
+      const socket = this.connections.get(appId)
+      if (socket) {
+        socket.disconnect()
+        this.connections.delete(appId)
+        this.connecting.delete(appId)
+      }
+    }
+    else {
+      this.connections.forEach(socket => socket.disconnect())
+      this.connections.clear()
+      this.connecting.clear()
+    }
+  }
+
+  getSocket(appId: string): Socket | null {
+    return this.connections.get(appId) || null
+  }
+
+  isConnected(appId: string): boolean {
+    return this.connections.get(appId)?.connected || false
+  }
+
+  getConnectedApps(): string[] {
+    const connectedApps: string[] = []
+    this.connections.forEach((socket, appId) => {
+      if (socket.connected)
+        connectedApps.push(appId)
+    })
+    return connectedApps
+  }
+
+  getDebugInfo(): DebugInfo {
+    const info: DebugInfo = {}
+    this.connections.forEach((socket, appId) => {
+      info[appId] = {
+        connected: socket.connected,
+        connecting: this.connecting.has(appId),
+        socketId: socket.id,
+      }
+    })
+    return info
+  }
+
+  private setupBaseEventListeners(socket: Socket, appId: string): void {
+    socket.on('connect', () => {
+      this.connecting.delete(appId)
+      emitWithAuthGuard(socket, 'user_connect', { workflow_id: appId })
+    })
+
+    socket.on('disconnect', () => {
+      this.connecting.delete(appId)
+    })
+
+    socket.on('connect_error', () => {
+      this.connecting.delete(appId)
+    })
+  }
+}
+
+export const webSocketClient = new WebSocketClient()

web/app/components/workflow/collaboration/hooks/use-collaboration.ts

@@ -0,0 +1,119 @@
+import { useEffect, useRef, useState } from 'react'
+import type { ReactFlowInstance } from 'reactflow'
+import { collaborationManager } from '../core/collaboration-manager'
+import { CursorService } from '../services/cursor-service'
+import type { CollaborationState } from '../types/collaboration'
+import { useGlobalPublicStore } from '@/context/global-public-context'
+
+export function useCollaboration(appId: string, reactFlowStore?: any) {
+  const [state, setState] = useState<Partial<CollaborationState & { isLeader: boolean }>>({
+    isConnected: false,
+    onlineUsers: [],
+    cursors: {},
+    nodePanelPresence: {},
+    isLeader: false,
+  })
+
+  const cursorServiceRef = useRef<CursorService | null>(null)
+  const isCollaborationEnabled = useGlobalPublicStore(s => s.systemFeatures.enable_collaboration_mode)
+
+  useEffect(() => {
+    if (!appId || !isCollaborationEnabled) {
+      setState({
+        isConnected: false,
+        onlineUsers: [],
+        cursors: {},
+        nodePanelPresence: {},
+        isLeader: false,
+      })
+      return
+    }
+
+    let connectionId: string | null = null
+    let isUnmounted = false
+
+    if (!cursorServiceRef.current)
+      cursorServiceRef.current = new CursorService()
+
+    const initCollaboration = async () => {
+      try {
+        const id = await collaborationManager.connect(appId, reactFlowStore)
+        if (isUnmounted) {
+          collaborationManager.disconnect(id)
+          return
+        }
+        connectionId = id
+        setState((prev: any) => ({ ...prev, appId, isConnected: collaborationManager.isConnected() }))
+      }
+      catch (error) {
+        console.error('Failed to initialize collaboration:', error)
+      }
+    }
+
+    initCollaboration()
+
+    const unsubscribeStateChange = collaborationManager.onStateChange((newState: any) => {
+      console.log('Collaboration state change:', newState)
+      setState((prev: any) => ({ ...prev, ...newState }))
+    })
+
+    const unsubscribeCursors = collaborationManager.onCursorUpdate((cursors: any) => {
+      setState((prev: any) => ({ ...prev, cursors }))
+    })
+
+    const unsubscribeUsers = collaborationManager.onOnlineUsersUpdate((users: any) => {
+      console.log('Online users update:', users)
+      setState((prev: any) => ({ ...prev, onlineUsers: users }))
+    })
+
+    const unsubscribeNodePanelPresence = collaborationManager.onNodePanelPresenceUpdate((presence) => {
+      setState((prev: any) => ({ ...prev, nodePanelPresence: presence }))
+    })
+
+    const unsubscribeLeaderChange = collaborationManager.onLeaderChange((isLeader: boolean) => {
+      console.log('Leader status changed:', isLeader)
+      setState((prev: any) => ({ ...prev, isLeader }))
+    })
+
+    return () => {
+      isUnmounted = true
+      unsubscribeStateChange()
+      unsubscribeCursors()
+      unsubscribeUsers()
+      unsubscribeNodePanelPresence()
+      unsubscribeLeaderChange()
+      cursorServiceRef.current?.stopTracking()
+      if (connectionId)
+        collaborationManager.disconnect(connectionId)
+    }
+  }, [appId, reactFlowStore, isCollaborationEnabled])
+
+  const startCursorTracking = (containerRef: React.RefObject<HTMLElement>, reactFlowInstance?: ReactFlowInstance) => {
+    if (!isCollaborationEnabled || !cursorServiceRef.current)
+      return
+
+    if (cursorServiceRef.current) {
+      cursorServiceRef.current.startTracking(containerRef, (position) => {
+        collaborationManager.emitCursorMove(position)
+      }, reactFlowInstance)
+    }
+  }
+
+  const stopCursorTracking = () => {
+    cursorServiceRef.current?.stopTracking()
+  }
+
+  const result = {
+    isConnected: state.isConnected || false,
+    onlineUsers: state.onlineUsers || [],
+    cursors: state.cursors || {},
+    nodePanelPresence: state.nodePanelPresence || {},
+    isLeader: state.isLeader || false,
+    leaderId: collaborationManager.getLeaderId(),
+    isEnabled: isCollaborationEnabled,
+    startCursorTracking,
+    stopCursorTracking,
+  }
+
+  return result
+}

web/app/components/workflow/collaboration/index.ts

@@ -0,0 +1,5 @@
+export { collaborationManager } from './core/collaboration-manager'
+export { webSocketClient } from './core/websocket-manager'
+export { CursorService } from './services/cursor-service'
+export { useCollaboration } from './hooks/use-collaboration'
+export * from './types'

web/app/components/workflow/collaboration/services/cursor-service.ts

@@ -0,0 +1,88 @@
+import type { RefObject } from 'react'
+import type { CursorPosition } from '../types/collaboration'
+import type { ReactFlowInstance } from 'reactflow'
+
+const CURSOR_MIN_MOVE_DISTANCE = 10
+const CURSOR_THROTTLE_MS = 500
+
+export class CursorService {
+  private containerRef: RefObject<HTMLElement> | null = null
+  private reactFlowInstance: ReactFlowInstance | null = null
+  private isTracking = false
+  private onCursorUpdate: ((cursors: Record<string, CursorPosition>) => void) | null = null
+  private onEmitPosition: ((position: CursorPosition) => void) | null = null
+  private lastEmitTime = 0
+  private lastPosition: { x: number; y: number } | null = null
+
+  startTracking(
+    containerRef: RefObject<HTMLElement>,
+    onEmitPosition: (position: CursorPosition) => void,
+    reactFlowInstance?: ReactFlowInstance,
+  ): void {
+    if (this.isTracking) this.stopTracking()
+
+    this.containerRef = containerRef
+    this.onEmitPosition = onEmitPosition
+    this.reactFlowInstance = reactFlowInstance || null
+    this.isTracking = true
+
+    if (containerRef.current)
+      containerRef.current.addEventListener('mousemove', this.handleMouseMove)
+  }
+
+  stopTracking(): void {
+    if (this.containerRef?.current)
+      this.containerRef.current.removeEventListener('mousemove', this.handleMouseMove)
+
+    this.containerRef = null
+    this.reactFlowInstance = null
+    this.onEmitPosition = null
+    this.isTracking = false
+    this.lastPosition = null
+  }
+
+  setCursorUpdateHandler(handler: (cursors: Record<string, CursorPosition>) => void): void {
+    this.onCursorUpdate = handler
+  }
+
+  updateCursors(cursors: Record<string, CursorPosition>): void {
+    if (this.onCursorUpdate)
+      this.onCursorUpdate(cursors)
+  }
+
+  private handleMouseMove = (event: MouseEvent): void => {
+    if (!this.containerRef?.current || !this.onEmitPosition) return
+
+    const rect = this.containerRef.current.getBoundingClientRect()
+    let x = event.clientX - rect.left
+    let y = event.clientY - rect.top
+
+    // Transform coordinates to ReactFlow world coordinates if ReactFlow instance is available
+    if (this.reactFlowInstance) {
+      const viewport = this.reactFlowInstance.getViewport()
+      // Convert screen coordinates to world coordinates
+      // World coordinates = (screen coordinates - viewport translation) / zoom
+      x = (x - viewport.x) / viewport.zoom
+      y = (y - viewport.y) / viewport.zoom
+    }
+
+    // Always emit cursor position (remove boundary check since world coordinates can be negative)
+    const now = Date.now()
+    const timeThrottled = now - this.lastEmitTime > CURSOR_THROTTLE_MS
+    const minDistance = CURSOR_MIN_MOVE_DISTANCE / (this.reactFlowInstance?.getZoom() || 1)
+    const distanceThrottled = !this.lastPosition
+        || (Math.abs(x - this.lastPosition.x) > minDistance)
+        || (Math.abs(y - this.lastPosition.y) > minDistance)
+
+    if (timeThrottled && distanceThrottled) {
+      this.lastPosition = { x, y }
+      this.lastEmitTime = now
+      this.onEmitPosition({
+        x,
+        y,
+        userId: '',
+        timestamp: now,
+      })
+    }
+  }
+}

web/app/components/workflow/collaboration/types/collaboration.ts

@@ -0,0 +1,57 @@
+import type { Edge, Node } from '../../types'
+
+export type OnlineUser = {
+  user_id: string
+  username: string
+  avatar: string
+  sid: string
+}
+
+export type WorkflowOnlineUsers = {
+  workflow_id: string
+  users: OnlineUser[]
+}
+
+export type OnlineUserListResponse = {
+  data: WorkflowOnlineUsers[]
+}
+
+export type CursorPosition = {
+  x: number
+  y: number
+  userId: string
+  timestamp: number
+}
+
+export type NodePanelPresenceUser = {
+  userId: string
+  username: string
+  avatar?: string | null
+}
+
+export type NodePanelPresenceInfo = NodePanelPresenceUser & {
+  clientId: string
+  timestamp: number
+}
+
+export type NodePanelPresenceMap = Record<string, Record<string, NodePanelPresenceInfo>>
+
+export type CollaborationState = {
+  appId: string
+  isConnected: boolean
+  onlineUsers: OnlineUser[]
+  cursors: Record<string, CursorPosition>
+  nodePanelPresence: NodePanelPresenceMap
+}
+
+export type GraphSyncData = {
+  nodes: Node[]
+  edges: Edge[]
+}
+
+export type CollaborationUpdate = {
+  type: 'mouse_move' | 'vars_and_features_update' | 'sync_request' | 'app_state_update' | 'app_meta_update' | 'mcp_server_update' | 'workflow_update' | 'comments_update' | 'node_panel_presence' | 'app_publish_update'
+  userId: string
+  data: any
+  timestamp: number
+}

web/app/components/workflow/collaboration/types/events.ts

@@ -0,0 +1,38 @@
+export type CollaborationEvent = {
+  type: string
+  data: any
+  timestamp: number
+}
+
+export type GraphUpdateEvent = {
+  type: 'graph_update'
+  data: Uint8Array
+} & CollaborationEvent
+
+export type CursorMoveEvent = {
+  type: 'cursor_move'
+  data: {
+    x: number
+    y: number
+    userId: string
+  }
+} & CollaborationEvent
+
+export type UserConnectEvent = {
+  type: 'user_connect'
+  data: {
+    workflow_id: string
+  }
+} & CollaborationEvent
+
+export type OnlineUsersEvent = {
+  type: 'online_users'
+  data: {
+    users: Array<{
+      user_id: string
+      username: string
+      avatar: string
+      sid: string
+    }>
+  }
+} & CollaborationEvent

web/app/components/workflow/collaboration/types/index.ts

@@ -0,0 +1,3 @@
+export * from './websocket'
+export * from './collaboration'
+export * from './events'

web/app/components/workflow/collaboration/types/websocket.ts

@@ -0,0 +1,16 @@
+export type WebSocketConfig = {
+  url?: string
+  token?: string
+  transports?: string[]
+  withCredentials?: boolean
+}
+
+export type ConnectionInfo = {
+  connected: boolean
+  connecting: boolean
+  socketId?: string
+}
+
+export type DebugInfo = {
+  [appId: string]: ConnectionInfo
+}

web/app/components/workflow/collaboration/utils/user-color.ts

@@ -0,0 +1,12 @@
+/**
+ * Generate a consistent color for a user based on their ID
+ * Used for cursor colors and avatar backgrounds
+ */
+export const getUserColor = (id: string): string => {
+  const colors = ['#155AEF', '#0BA5EC', '#444CE7', '#7839EE', '#4CA30D', '#0E9384', '#DD2590', '#FF4405', '#D92D20', '#F79009', '#828DAD']
+  const hash = id.split('').reduce((a, b) => {
+    a = ((a << 5) - a) + b.charCodeAt(0)
+    return a & a
+  }, 0)
+  return colors[Math.abs(hash) % colors.length]
+}

web/app/components/workflow/comment-manager.tsx

@@ -0,0 +1,34 @@
+import { useEventListener } from 'ahooks'
+import { useWorkflowStore } from './store'
+import { useWorkflowComment } from './hooks/use-workflow-comment'
+
+const CommentManager = () => {
+  const workflowStore = useWorkflowStore()
+  const { handleCreateComment, handleCommentCancel } = useWorkflowComment()
+
+  useEventListener('click', (e) => {
+    const { controlMode, mousePosition, pendingComment } = workflowStore.getState()
+
+    if (controlMode === 'comment') {
+      const target = e.target as HTMLElement
+      const isInDropdown = target.closest('[data-mention-dropdown]')
+      const isInCommentInput = target.closest('[data-comment-input]')
+      const isOnCanvasPane = target.closest('.react-flow__pane')
+
+      // Only when clicking on the React Flow canvas pane (background),
+      // and not inside comment input or its dropdown
+      if (!isInDropdown && !isInCommentInput && isOnCanvasPane) {
+        e.preventDefault()
+        e.stopPropagation()
+        if (pendingComment)
+          handleCommentCancel()
+        else
+          handleCreateComment(mousePosition)
+      }
+    }
+  })
+
+  return null
+}
+
+export default CommentManager

web/app/components/workflow/comment/comment-icon.tsx

@@ -0,0 +1,265 @@
+'use client'
+
+import type { FC, PointerEvent as ReactPointerEvent } from 'react'
+import { memo, useCallback, useMemo, useRef, useState } from 'react'
+import { useReactFlow, useViewport } from 'reactflow'
+import { UserAvatarList } from '@/app/components/base/user-avatar-list'
+import CommentPreview from './comment-preview'
+import type { WorkflowCommentList } from '@/service/workflow-comment'
+import { useAppContext } from '@/context/app-context'
+
+type CommentIconProps = {
+  comment: WorkflowCommentList
+  onClick: () => void
+  isActive?: boolean
+  onPositionUpdate?: (position: { x: number; y: number }) => void
+}
+
+export const CommentIcon: FC<CommentIconProps> = memo(({ comment, onClick, isActive = false, onPositionUpdate }) => {
+  const { flowToScreenPosition, screenToFlowPosition } = useReactFlow()
+  const viewport = useViewport()
+  const { userProfile } = useAppContext()
+  const isAuthor = comment.created_by_account?.id === userProfile?.id
+  const [showPreview, setShowPreview] = useState(false)
+  const [dragPosition, setDragPosition] = useState<{ x: number; y: number } | null>(null)
+  const [isDragging, setIsDragging] = useState(false)
+  const dragStateRef = useRef<{
+    offsetX: number
+    offsetY: number
+    startX: number
+    startY: number
+    hasMoved: boolean
+  } | null>(null)
+
+  const workflowContainerRect = typeof document !== 'undefined'
+    ? document.getElementById('workflow-container')?.getBoundingClientRect()
+    : null
+  const containerLeft = workflowContainerRect?.left ?? 0
+  const containerTop = workflowContainerRect?.top ?? 0
+
+  const screenPosition = useMemo(() => {
+    return flowToScreenPosition({
+      x: comment.position_x,
+      y: comment.position_y,
+    })
+  }, [comment.position_x, comment.position_y, viewport.x, viewport.y, viewport.zoom, flowToScreenPosition])
+
+  const effectiveScreenPosition = dragPosition ?? screenPosition
+  const canvasPosition = useMemo(() => ({
+    x: effectiveScreenPosition.x - containerLeft,
+    y: effectiveScreenPosition.y - containerTop,
+  }), [effectiveScreenPosition.x, effectiveScreenPosition.y, containerLeft, containerTop])
+  const cursorClass = useMemo(() => {
+    if (!isAuthor)
+      return 'cursor-pointer'
+    if (isActive)
+      return isDragging ? 'cursor-grabbing' : ''
+    return isDragging ? 'cursor-grabbing' : 'cursor-pointer'
+  }, [isActive, isAuthor, isDragging])
+
+  const handlePointerDown = useCallback((event: ReactPointerEvent<HTMLDivElement>) => {
+    if (event.button !== 0)
+      return
+
+    event.stopPropagation()
+    event.preventDefault()
+
+    if (!isAuthor) {
+      if (event.currentTarget.dataset.role !== 'comment-preview')
+        setShowPreview(false)
+      return
+    }
+
+    dragStateRef.current = {
+      offsetX: event.clientX - screenPosition.x,
+      offsetY: event.clientY - screenPosition.y,
+      startX: event.clientX,
+      startY: event.clientY,
+      hasMoved: false,
+    }
+
+    setDragPosition(screenPosition)
+    setIsDragging(false)
+
+    if (event.currentTarget.dataset.role !== 'comment-preview')
+      setShowPreview(false)
+
+    if (event.currentTarget.setPointerCapture)
+      event.currentTarget.setPointerCapture(event.pointerId)
+  }, [isAuthor, screenPosition])
+
+  const handlePointerMove = useCallback((event: ReactPointerEvent<HTMLDivElement>) => {
+    const dragState = dragStateRef.current
+    if (!dragState)
+      return
+
+    event.stopPropagation()
+    event.preventDefault()
+
+    const nextX = event.clientX - dragState.offsetX
+    const nextY = event.clientY - dragState.offsetY
+
+    if (!dragState.hasMoved) {
+      const distance = Math.hypot(event.clientX - dragState.startX, event.clientY - dragState.startY)
+      if (distance > 4) {
+        dragState.hasMoved = true
+        setIsDragging(true)
+      }
+    }
+
+    setDragPosition({ x: nextX, y: nextY })
+  }, [])
+
+  const finishDrag = useCallback((event: ReactPointerEvent<HTMLDivElement>) => {
+    const dragState = dragStateRef.current
+    if (!dragState)
+      return false
+
+    if (event.currentTarget.hasPointerCapture?.(event.pointerId))
+      event.currentTarget.releasePointerCapture(event.pointerId)
+
+    dragStateRef.current = null
+    setDragPosition(null)
+    setIsDragging(false)
+    return dragState.hasMoved
+  }, [])
+
+  const handlePointerUp = useCallback((event: ReactPointerEvent<HTMLDivElement>) => {
+    event.stopPropagation()
+    event.preventDefault()
+
+    const finalScreenPosition = dragPosition ?? screenPosition
+    const didDrag = finishDrag(event)
+
+    setShowPreview(false)
+
+    if (didDrag) {
+      if (onPositionUpdate) {
+        const flowPosition = screenToFlowPosition({
+          x: finalScreenPosition.x,
+          y: finalScreenPosition.y,
+        })
+        onPositionUpdate(flowPosition)
+      }
+    }
+    else if (!isActive) {
+      onClick()
+    }
+  }, [dragPosition, finishDrag, isActive, onClick, onPositionUpdate, screenPosition, screenToFlowPosition])
+
+  const handlePointerCancel = useCallback((event: ReactPointerEvent<HTMLDivElement>) => {
+    event.stopPropagation()
+    event.preventDefault()
+    finishDrag(event)
+  }, [finishDrag])
+
+  const handleMouseEnter = useCallback(() => {
+    if (isActive || isDragging)
+      return
+    setShowPreview(true)
+  }, [isActive, isDragging])
+
+  const handleMouseLeave = useCallback(() => {
+    setShowPreview(false)
+  }, [])
+
+  const participants = useMemo(() => {
+    const list = comment.participants ?? []
+    const author = comment.created_by_account
+    if (!author)
+      return [...list]
+    const rest = list.filter(user => user.id !== author.id)
+    return [author, ...rest]
+  }, [comment.created_by_account, comment.participants])
+
+  // Calculate dynamic width based on number of participants
+  const participantCount = participants.length
+  const maxVisible = Math.min(3, participantCount)
+  const showCount = participantCount > 3
+  const avatarSize = 24
+  const avatarSpacing = 4 // -space-x-1 is about 4px overlap
+
+  // Width calculation: first avatar + (additional avatars * (size - spacing)) + padding
+  const dynamicWidth = Math.max(40, // minimum width
+    8 + avatarSize + Math.max(0, (showCount ? 2 : maxVisible - 1)) * (avatarSize - avatarSpacing) + 8,
+  )
+
+  const pointerEventHandlers = useMemo(() => ({
+    onPointerDown: handlePointerDown,
+    onPointerMove: handlePointerMove,
+    onPointerUp: handlePointerUp,
+    onPointerCancel: handlePointerCancel,
+  }), [handlePointerCancel, handlePointerDown, handlePointerMove, handlePointerUp])
+
+  return (
+    <>
+      <div
+        className="absolute z-10"
+        style={{
+          left: canvasPosition.x,
+          top: canvasPosition.y,
+          transform: 'translate(-50%, -50%)',
+        }}
+        data-role='comment-marker'
+        {...pointerEventHandlers}
+      >
+        <div
+          className={cursorClass}
+          onMouseEnter={handleMouseEnter}
+          onMouseLeave={handleMouseLeave}
+        >
+          <div
+            className={'relative h-10 rounded-br-full rounded-tl-full rounded-tr-full'}
+            style={{ width: dynamicWidth }}
+          >
+            <div className={`absolute inset-[6px] overflow-hidden rounded-br-full rounded-tl-full rounded-tr-full border bg-components-panel-bg transition-shadow ${
+              isActive
+                ? 'border-primary-500 ring-1 ring-primary-500'
+                : 'border-components-panel-border'
+            }`}>
+              <div className="flex h-full w-full items-center justify-center px-1">
+                <UserAvatarList
+                  users={participants}
+                  maxVisible={3}
+                  size={24}
+                />
+              </div>
+            </div>
+          </div>
+        </div>
+      </div>
+
+      {/* Preview panel */}
+      {showPreview && !isActive && (
+        <div
+          className="absolute z-20"
+          style={{
+            left: (effectiveScreenPosition.x - containerLeft) - dynamicWidth / 2,
+            top: (effectiveScreenPosition.y - containerTop) + 20,
+            transform: 'translateY(-100%)',
+          }}
+          data-role='comment-preview'
+          {...pointerEventHandlers}
+          onMouseEnter={() => setShowPreview(true)}
+          onMouseLeave={() => setShowPreview(false)}
+        >
+          <CommentPreview comment={comment} onClick={() => {
+            setShowPreview(false)
+            onClick()
+          }} />
+        </div>
+      )}
+    </>
+  )
+}, (prevProps, nextProps) => {
+  return (
+    prevProps.comment.id === nextProps.comment.id
+    && prevProps.comment.position_x === nextProps.comment.position_x
+    && prevProps.comment.position_y === nextProps.comment.position_y
+    && prevProps.onClick === nextProps.onClick
+    && prevProps.isActive === nextProps.isActive
+    && prevProps.onPositionUpdate === nextProps.onPositionUpdate
+  )
+})
+
+CommentIcon.displayName = 'CommentIcon'

web/app/components/workflow/comment/comment-input.tsx

@@ -0,0 +1,87 @@
+import type { FC } from 'react'
+import { memo, useCallback, useEffect, useState } from 'react'
+import { useTranslation } from 'react-i18next'
+import Avatar from '@/app/components/base/avatar'
+import { useAppContext } from '@/context/app-context'
+import { MentionInput } from './mention-input'
+import cn from '@/utils/classnames'
+
+type CommentInputProps = {
+  position: { x: number; y: number }
+  onSubmit: (content: string, mentionedUserIds: string[]) => void
+  onCancel: () => void
+}
+
+export const CommentInput: FC<CommentInputProps> = memo(({ position, onSubmit, onCancel }) => {
+  const [content, setContent] = useState('')
+  const { t } = useTranslation()
+  const { userProfile } = useAppContext()
+
+  useEffect(() => {
+    const handleGlobalKeyDown = (e: KeyboardEvent) => {
+      if (e.key === 'Escape') {
+        e.preventDefault()
+        e.stopPropagation()
+        onCancel()
+      }
+    }
+
+    document.addEventListener('keydown', handleGlobalKeyDown, true)
+    return () => {
+      document.removeEventListener('keydown', handleGlobalKeyDown, true)
+    }
+  }, [onCancel])
+
+  const handleMentionSubmit = useCallback((content: string, mentionedUserIds: string[]) => {
+    onSubmit(content, mentionedUserIds)
+    setContent('')
+  }, [onSubmit])
+
+  return (
+    <div
+      className="absolute z-[60] w-96"
+      style={{
+        left: position.x,
+        top: position.y,
+      }}
+      data-comment-input
+    >
+      <div className="flex items-center gap-3">
+        <div className="relative shrink-0">
+          <div className="relative h-8 w-8 overflow-hidden rounded-br-full rounded-tl-full rounded-tr-full bg-primary-500">
+            <div className="absolute inset-[2px] overflow-hidden rounded-br-full rounded-tl-full rounded-tr-full bg-white">
+              <div className="flex h-full w-full items-center justify-center">
+                <div className="h-6 w-6 overflow-hidden rounded-full">
+                  <Avatar
+                    avatar={userProfile.avatar_url}
+                    name={userProfile.name}
+                    size={24}
+                    className="h-full w-full"
+                  />
+                </div>
+              </div>
+            </div>
+          </div>
+        </div>
+        <div
+          className={cn(
+            'relative z-10 flex-1 rounded-xl border border-components-chat-input-border bg-components-panel-bg-blur pb-[4px] shadow-md',
+          )}
+        >
+          <div className='relative px-[9px] pt-[4px]'>
+            <MentionInput
+              value={content}
+              onChange={setContent}
+              onSubmit={handleMentionSubmit}
+              placeholder={t('workflow.comments.placeholder.add')}
+              autoFocus
+              className="relative"
+            />
+          </div>
+        </div>
+      </div>
+    </div>
+  )
+})
+
+CommentInput.displayName = 'CommentInput'

web/app/components/workflow/comment/comment-preview.tsx

@@ -0,0 +1,59 @@
+'use client'
+
+import type { FC } from 'react'
+import { memo, useEffect, useMemo } from 'react'
+import { UserAvatarList } from '@/app/components/base/user-avatar-list'
+import type { WorkflowCommentList } from '@/service/workflow-comment'
+import { useFormatTimeFromNow } from '@/hooks/use-format-time-from-now'
+import { useStore } from '../store'
+
+type CommentPreviewProps = {
+  comment: WorkflowCommentList
+  onClick?: () => void
+}
+
+const CommentPreview: FC<CommentPreviewProps> = ({ comment, onClick }) => {
+  const { formatTimeFromNow } = useFormatTimeFromNow()
+  const setCommentPreviewHovering = useStore(s => s.setCommentPreviewHovering)
+  const participants = useMemo(() => {
+    const list = comment.participants ?? []
+    const author = comment.created_by_account
+    if (!author)
+      return [...list]
+    const rest = list.filter(user => user.id !== author.id)
+    return [author, ...rest]
+  }, [comment.created_by_account, comment.participants])
+  useEffect(() => () => {
+    setCommentPreviewHovering(false)
+  }, [setCommentPreviewHovering])
+
+  return (
+    <div
+      className="w-80 cursor-pointer rounded-3xl rounded-bl-[3px] border-[0.5px] border-components-panel-border bg-components-panel-bg-blur p-4 shadow-lg backdrop-blur-[10px] transition-colors hover:bg-components-panel-on-panel-item-bg-hover"
+      onClick={onClick}
+      onMouseEnter={() => setCommentPreviewHovering(true)}
+      onMouseLeave={() => setCommentPreviewHovering(false)}
+    >
+      <div className="mb-3 flex items-center justify-between">
+        <UserAvatarList
+          users={participants}
+          maxVisible={3}
+          size={24}
+        />
+      </div>
+
+      <div className="mb-2 flex items-start">
+        <div className="flex min-w-0 items-center gap-2">
+          <div className="system-sm-medium truncate text-text-primary">{comment.created_by_account.name}</div>
+          <div className="system-2xs-regular shrink-0 text-text-tertiary">
+            {formatTimeFromNow(comment.updated_at * 1000)}
+          </div>
+        </div>
+      </div>
+
+      <div className="system-sm-regular break-words text-text-secondary">{comment.content}</div>
+    </div>
+  )
+}
+
+export default memo(CommentPreview)

web/app/components/workflow/comment/cursor.tsx

@@ -0,0 +1,28 @@
+import type { FC } from 'react'
+import { memo } from 'react'
+import { useStore } from '../store'
+import { ControlMode } from '../types'
+import { Comment } from '@/app/components/base/icons/src/public/other'
+
+export const CommentCursor: FC = memo(() => {
+  const controlMode = useStore(s => s.controlMode)
+  const mousePosition = useStore(s => s.mousePosition)
+
+  if (controlMode !== ControlMode.Comment)
+    return null
+
+  return (
+    <div
+      className="pointer-events-none absolute z-50 flex h-6 w-6 items-center justify-center"
+      style={{
+        left: mousePosition.elementX,
+        top: mousePosition.elementY,
+        transform: 'translate(-50%, -50%)',
+      }}
+    >
+      <Comment className="text-text-primary" />
+    </div>
+  )
+})
+
+CommentCursor.displayName = 'CommentCursor'

web/app/components/workflow/comment/index.tsx

@@ -0,0 +1,5 @@
+export { CommentCursor } from './cursor'
+export { CommentInput } from './comment-input'
+export { CommentIcon } from './comment-icon'
+export { CommentThread } from './thread'
+export { MentionInput } from './mention-input'

web/app/components/workflow/comment/mention-input.tsx

@@ -0,0 +1,649 @@
+'use client'
+
+import type { ReactNode } from 'react'
+import {
+  forwardRef,
+  memo,
+  useCallback,
+  useEffect,
+  useImperativeHandle,
+  useLayoutEffect,
+  useMemo,
+  useRef,
+  useState,
+} from 'react'
+import { createPortal } from 'react-dom'
+import { useParams } from 'next/navigation'
+import { useTranslation } from 'react-i18next'
+import { RiArrowUpLine, RiAtLine, RiLoader2Line } from '@remixicon/react'
+import Textarea from 'react-textarea-autosize'
+import Button from '@/app/components/base/button'
+import Avatar from '@/app/components/base/avatar'
+import cn from '@/utils/classnames'
+import { type UserProfile, fetchMentionableUsers } from '@/service/workflow-comment'
+import { useStore, useWorkflowStore } from '../store'
+import { EnterKey } from '@/app/components/base/icons/src/public/common'
+
+type MentionInputProps = {
+  value: string
+  onChange: (value: string) => void
+  onSubmit: (content: string, mentionedUserIds: string[]) => void
+  onCancel?: () => void
+  placeholder?: string
+  disabled?: boolean
+  loading?: boolean
+  className?: string
+  isEditing?: boolean
+  autoFocus?: boolean
+}
+
+const MentionInputInner = forwardRef<HTMLTextAreaElement, MentionInputProps>(({
+  value,
+  onChange,
+  onSubmit,
+  onCancel,
+  placeholder,
+  disabled = false,
+  loading = false,
+  className,
+  isEditing = false,
+  autoFocus = false,
+}, forwardedRef) => {
+  const params = useParams()
+  const { t } = useTranslation()
+  const appId = params.appId as string
+  const textareaRef = useRef<HTMLTextAreaElement>(null)
+  const highlightContentRef = useRef<HTMLDivElement>(null)
+  const actionContainerRef = useRef<HTMLDivElement | null>(null)
+  const actionRightRef = useRef<HTMLDivElement | null>(null)
+  const baseTextareaHeightRef = useRef<number | null>(null)
+
+  // Expose textarea ref to parent component
+  useImperativeHandle(forwardedRef, () => textareaRef.current!, [])
+
+  const workflowStore = useWorkflowStore()
+  const mentionUsersFromStore = useStore(state => (
+    appId ? state.mentionableUsersCache[appId] : undefined
+  ))
+  const mentionUsers = mentionUsersFromStore ?? []
+
+  const [showMentionDropdown, setShowMentionDropdown] = useState(false)
+  const [mentionQuery, setMentionQuery] = useState('')
+  const [mentionPosition, setMentionPosition] = useState(0)
+  const [selectedMentionIndex, setSelectedMentionIndex] = useState(0)
+  const [mentionedUserIds, setMentionedUserIds] = useState<string[]>([])
+  const resolvedPlaceholder = placeholder ?? t('workflow.comments.placeholder.add')
+  const BASE_PADDING = 4
+  const [shouldReserveButtonGap, setShouldReserveButtonGap] = useState(isEditing)
+  const [shouldReserveHorizontalSpace, setShouldReserveHorizontalSpace] = useState(() => !isEditing)
+  const [paddingRight, setPaddingRight] = useState(() => BASE_PADDING + (isEditing ? 0 : 48))
+  const [paddingBottom, setPaddingBottom] = useState(() => BASE_PADDING + (isEditing ? 32 : 0))
+
+  const mentionNameList = useMemo(() => {
+    const names = mentionUsers
+      .map(user => user.name?.trim())
+      .filter((name): name is string => Boolean(name))
+
+    const uniqueNames = Array.from(new Set(names))
+    uniqueNames.sort((a, b) => b.length - a.length)
+    return uniqueNames
+  }, [mentionUsers])
+
+  const highlightedValue = useMemo<ReactNode>(() => {
+    if (!value)
+      return ''
+
+    if (mentionNameList.length === 0)
+      return value
+
+    const segments: ReactNode[] = []
+    let cursor = 0
+    let hasMention = false
+
+    while (cursor < value.length) {
+      let nextMatchStart = -1
+      let matchedName = ''
+
+      for (const name of mentionNameList) {
+        const searchStart = value.indexOf(`@${name}`, cursor)
+        if (searchStart === -1)
+          continue
+
+        const previousChar = searchStart > 0 ? value[searchStart - 1] : ''
+        if (searchStart > 0 && !/\s/.test(previousChar))
+          continue
+
+        if (
+          nextMatchStart === -1
+          || searchStart < nextMatchStart
+          || (searchStart === nextMatchStart && name.length > matchedName.length)
+        ) {
+          nextMatchStart = searchStart
+          matchedName = name
+        }
+      }
+
+      if (nextMatchStart === -1)
+        break
+
+      if (nextMatchStart > cursor)
+        segments.push(<span key={`text-${cursor}`}>{value.slice(cursor, nextMatchStart)}</span>)
+
+      const mentionEnd = nextMatchStart + matchedName.length + 1
+      segments.push(
+        <span key={`mention-${nextMatchStart}`} className='text-primary-600'>
+          {value.slice(nextMatchStart, mentionEnd)}
+        </span>,
+      )
+
+      hasMention = true
+      cursor = mentionEnd
+    }
+
+    if (!hasMention)
+      return value
+
+    if (cursor < value.length)
+      segments.push(<span key={`text-${cursor}`}>{value.slice(cursor)}</span>)
+
+    return segments
+  }, [value, mentionNameList])
+
+  const loadMentionableUsers = useCallback(async () => {
+    if (!appId)
+      return
+
+    const state = workflowStore.getState()
+    if (state.mentionableUsersCache[appId] !== undefined)
+      return
+
+    if (state.mentionableUsersLoading[appId])
+      return
+
+    state.setMentionableUsersLoading(appId, true)
+    try {
+      const users = await fetchMentionableUsers(appId)
+      workflowStore.getState().setMentionableUsersCache(appId, users)
+    }
+    catch (error) {
+      console.error('Failed to load mentionable users:', error)
+    }
+    finally {
+      workflowStore.getState().setMentionableUsersLoading(appId, false)
+    }
+  }, [appId, workflowStore])
+
+  useEffect(() => {
+    loadMentionableUsers()
+  }, [loadMentionableUsers])
+  const syncHighlightScroll = useCallback(() => {
+    const textarea = textareaRef.current
+    const highlightContent = highlightContentRef.current
+    if (!textarea || !highlightContent)
+      return
+
+    const { scrollTop, scrollLeft } = textarea
+    highlightContent.style.transform = `translate(${-scrollLeft}px, ${-scrollTop}px)`
+  }, [])
+
+  const evaluateContentLayout = useCallback(() => {
+    const textarea = textareaRef.current
+    if (!textarea)
+      return
+
+    const extraBottom = Math.max(0, paddingBottom - BASE_PADDING)
+    const effectiveClientHeight = textarea.clientHeight - extraBottom
+
+    if (baseTextareaHeightRef.current === null)
+      baseTextareaHeightRef.current = effectiveClientHeight
+
+    const baseHeight = baseTextareaHeightRef.current ?? effectiveClientHeight
+    const hasMultiline = effectiveClientHeight > baseHeight + 1
+    const shouldReserveVertical = isEditing ? true : hasMultiline
+
+    setShouldReserveButtonGap(shouldReserveVertical)
+    setShouldReserveHorizontalSpace(!hasMultiline)
+  }, [isEditing, paddingBottom])
+
+  const updateLayoutPadding = useCallback(() => {
+    const actionEl = actionContainerRef.current
+    const rect = actionEl?.getBoundingClientRect()
+    const rightRect = actionRightRef.current?.getBoundingClientRect()
+    let actionWidth = 0
+    if (rightRect)
+      actionWidth = Math.ceil(rightRect.width)
+    else if (rect)
+      actionWidth = Math.ceil(rect.width)
+
+    const actionHeight = rect ? Math.ceil(rect.height) : 0
+    const fallbackWidth = Math.max(0, paddingRight - BASE_PADDING)
+    const fallbackHeight = Math.max(0, paddingBottom - BASE_PADDING)
+    const effectiveWidth = actionWidth > 0 ? actionWidth : fallbackWidth
+    const effectiveHeight = actionHeight > 0 ? actionHeight : fallbackHeight
+
+    const nextRight = BASE_PADDING + (shouldReserveHorizontalSpace ? effectiveWidth : 0)
+    const nextBottom = BASE_PADDING + (shouldReserveButtonGap ? effectiveHeight : 0)
+
+    setPaddingRight(prev => (prev === nextRight ? prev : nextRight))
+    setPaddingBottom(prev => (prev === nextBottom ? prev : nextBottom))
+  }, [shouldReserveButtonGap, shouldReserveHorizontalSpace, paddingRight, paddingBottom])
+
+  const setActionContainerRef = useCallback((node: HTMLDivElement | null) => {
+    actionContainerRef.current = node
+
+    if (!isEditing)
+      actionRightRef.current = node
+    else if (!node)
+      actionRightRef.current = null
+
+    if (node && typeof window !== 'undefined')
+      window.requestAnimationFrame(() => updateLayoutPadding())
+  }, [isEditing, updateLayoutPadding])
+
+  const setActionRightRef = useCallback((node: HTMLDivElement | null) => {
+    actionRightRef.current = node
+
+    if (node && typeof window !== 'undefined')
+      window.requestAnimationFrame(() => updateLayoutPadding())
+  }, [updateLayoutPadding])
+
+  useLayoutEffect(() => {
+    syncHighlightScroll()
+  }, [value, syncHighlightScroll])
+
+  useLayoutEffect(() => {
+    evaluateContentLayout()
+  }, [value, evaluateContentLayout])
+
+  useLayoutEffect(() => {
+    updateLayoutPadding()
+  }, [updateLayoutPadding, isEditing, shouldReserveButtonGap])
+
+  useEffect(() => {
+    const handleResize = () => {
+      evaluateContentLayout()
+      updateLayoutPadding()
+    }
+
+    window.addEventListener('resize', handleResize)
+    return () => window.removeEventListener('resize', handleResize)
+  }, [evaluateContentLayout, updateLayoutPadding])
+
+  useEffect(() => {
+    baseTextareaHeightRef.current = null
+    evaluateContentLayout()
+    setShouldReserveHorizontalSpace(!isEditing)
+  }, [isEditing, evaluateContentLayout])
+
+  const filteredMentionUsers = useMemo(() => {
+    if (!mentionQuery) return mentionUsers
+    return mentionUsers.filter(user =>
+      user.name.toLowerCase().includes(mentionQuery.toLowerCase())
+      || user.email.toLowerCase().includes(mentionQuery.toLowerCase()),
+    )
+  }, [mentionUsers, mentionQuery])
+
+  const shouldDisableMentionButton = useMemo(() => {
+    if (showMentionDropdown)
+      return true
+
+    const textarea = textareaRef.current
+    if (!textarea)
+      return false
+
+    const cursorPosition = textarea.selectionStart || 0
+    const textBeforeCursor = value.slice(0, cursorPosition)
+    return /@\w*$/.test(textBeforeCursor)
+  }, [showMentionDropdown, value])
+
+  const dropdownPosition = useMemo(() => {
+    if (!showMentionDropdown || !textareaRef.current)
+      return { x: 0, y: 0, placement: 'bottom' as const }
+
+    const textareaRect = textareaRef.current.getBoundingClientRect()
+    const dropdownHeight = 160 // max-h-40 = 10rem = 160px
+    const viewportHeight = window.innerHeight
+    const spaceBelow = viewportHeight - textareaRect.bottom
+    const spaceAbove = textareaRect.top
+
+    const shouldPlaceAbove = spaceBelow < dropdownHeight && spaceAbove > spaceBelow
+
+    return {
+      x: textareaRect.left,
+      y: shouldPlaceAbove ? textareaRect.top - 4 : textareaRect.bottom + 4,
+      placement: shouldPlaceAbove ? 'top' as const : 'bottom' as const,
+    }
+  }, [showMentionDropdown])
+
+  const handleContentChange = useCallback((newValue: string) => {
+    onChange(newValue)
+
+    setTimeout(() => {
+      const cursorPosition = textareaRef.current?.selectionStart || 0
+      const textBeforeCursor = newValue.slice(0, cursorPosition)
+      const mentionMatch = textBeforeCursor.match(/@(\w*)$/)
+
+      if (mentionMatch) {
+        setMentionQuery(mentionMatch[1])
+        setMentionPosition(cursorPosition - mentionMatch[0].length)
+        setShowMentionDropdown(true)
+        setSelectedMentionIndex(0)
+      }
+      else {
+        setShowMentionDropdown(false)
+      }
+
+      if (typeof window !== 'undefined') {
+        window.requestAnimationFrame(() => {
+          evaluateContentLayout()
+          syncHighlightScroll()
+        })
+      }
+    }, 0)
+  }, [onChange, evaluateContentLayout, syncHighlightScroll])
+
+  const handleMentionButtonClick = useCallback((e: React.MouseEvent) => {
+    e.preventDefault()
+    e.stopPropagation()
+
+    const textarea = textareaRef.current
+    if (!textarea)
+      return
+
+    const cursorPosition = textarea.selectionStart || 0
+    const textBeforeCursor = value.slice(0, cursorPosition)
+
+    if (showMentionDropdown)
+      return
+
+    if (/@\w*$/.test(textBeforeCursor))
+      return
+
+    const newContent = `${value.slice(0, cursorPosition)}@${value.slice(cursorPosition)}`
+
+    onChange(newContent)
+
+    setTimeout(() => {
+      const newCursorPos = cursorPosition + 1
+      textarea.setSelectionRange(newCursorPos, newCursorPos)
+      textarea.focus()
+
+      setMentionQuery('')
+      setMentionPosition(cursorPosition)
+      setShowMentionDropdown(true)
+      setSelectedMentionIndex(0)
+
+      if (typeof window !== 'undefined') {
+        window.requestAnimationFrame(() => {
+          evaluateContentLayout()
+          syncHighlightScroll()
+        })
+      }
+    }, 0)
+  }, [value, onChange, evaluateContentLayout, syncHighlightScroll, showMentionDropdown])
+
+  const insertMention = useCallback((user: UserProfile) => {
+    const textarea = textareaRef.current
+    if (!textarea) return
+
+    const beforeMention = value.slice(0, mentionPosition)
+    const afterMention = value.slice(textarea.selectionStart || 0)
+
+    const needsSpaceBefore = mentionPosition > 0 && !/\s/.test(value[mentionPosition - 1])
+    const prefix = needsSpaceBefore ? ' ' : ''
+    const newContent = `${beforeMention}${prefix}@${user.name} ${afterMention}`
+
+    onChange(newContent)
+    setShowMentionDropdown(false)
+
+    const newMentionedUserIds = [...mentionedUserIds, user.id]
+    setMentionedUserIds(newMentionedUserIds)
+
+    setTimeout(() => {
+      const extraSpace = needsSpaceBefore ? 1 : 0
+      const newCursorPos = mentionPosition + extraSpace + user.name.length + 2 // (space) + @ + name + space
+      textarea.setSelectionRange(newCursorPos, newCursorPos)
+      textarea.focus()
+      if (typeof window !== 'undefined') {
+        window.requestAnimationFrame(() => {
+          evaluateContentLayout()
+          syncHighlightScroll()
+        })
+      }
+    }, 0)
+  }, [value, mentionPosition, onChange, mentionedUserIds, evaluateContentLayout, syncHighlightScroll])
+
+  const handleSubmit = useCallback(async (e?: React.MouseEvent) => {
+    if (e) {
+      e.preventDefault()
+      e.stopPropagation()
+    }
+
+    if (value.trim()) {
+      try {
+        await onSubmit(value.trim(), mentionedUserIds)
+        setMentionedUserIds([])
+        setShowMentionDropdown(false)
+      }
+      catch (error) {
+        console.error('Failed to submit', error)
+      }
+    }
+  }, [value, mentionedUserIds, onSubmit])
+
+  const handleKeyDown = useCallback((e: React.KeyboardEvent) => {
+    // Ignore key events during IME composition (e.g., Chinese, Japanese input)
+    if (e.nativeEvent.isComposing)
+      return
+
+    if (showMentionDropdown) {
+      if (e.key === 'ArrowDown') {
+        e.preventDefault()
+        setSelectedMentionIndex(prev =>
+          prev < filteredMentionUsers.length - 1 ? prev + 1 : 0,
+        )
+      }
+      else if (e.key === 'ArrowUp') {
+        e.preventDefault()
+        setSelectedMentionIndex(prev =>
+          prev > 0 ? prev - 1 : filteredMentionUsers.length - 1,
+        )
+      }
+      else if (e.key === 'Enter') {
+        e.preventDefault()
+        if (filteredMentionUsers[selectedMentionIndex])
+          insertMention(filteredMentionUsers[selectedMentionIndex])
+
+        return
+      }
+      else if (e.key === 'Escape') {
+        e.preventDefault()
+        setShowMentionDropdown(false)
+        return
+      }
+    }
+
+    if (e.key === 'Enter' && !e.shiftKey && !showMentionDropdown) {
+      e.preventDefault()
+      handleSubmit()
+    }
+  }, [showMentionDropdown, filteredMentionUsers, selectedMentionIndex, insertMention, handleSubmit])
+
+  const resetMentionState = useCallback(() => {
+    setMentionedUserIds([])
+    setShowMentionDropdown(false)
+    setMentionQuery('')
+    setMentionPosition(0)
+    setSelectedMentionIndex(0)
+  }, [])
+
+  useEffect(() => {
+    if (!value)
+      resetMentionState()
+  }, [value, resetMentionState])
+
+  useEffect(() => {
+    if (autoFocus && textareaRef.current) {
+      const textarea = textareaRef.current
+      setTimeout(() => {
+        textarea.focus()
+        const length = textarea.value.length
+        textarea.setSelectionRange(length, length)
+      }, 0)
+    }
+  }, [autoFocus])
+
+  return (
+    <>
+      <div className={cn('relative flex items-center', className)}>
+        <div
+          aria-hidden
+          className={cn(
+            'pointer-events-none absolute inset-0 z-0 overflow-hidden whitespace-pre-wrap break-words p-1 leading-6',
+            'body-lg-regular text-text-primary',
+          )}
+          style={{ paddingRight, paddingBottom }}
+        >
+          <div
+            ref={highlightContentRef}
+            className="min-h-full"
+            style={{ willChange: 'transform' }}
+          >
+            {highlightedValue}
+            {'​'}
+          </div>
+        </div>
+        <Textarea
+          ref={textareaRef}
+          className={cn(
+            'body-lg-regular relative z-10 w-full resize-none bg-transparent p-1 leading-6 text-transparent caret-primary-500 outline-none',
+            'placeholder:text-text-tertiary',
+          )}
+          style={{ paddingRight, paddingBottom }}
+          placeholder={resolvedPlaceholder}
+          autoFocus={autoFocus}
+          minRows={isEditing ? 4 : 1}
+          maxRows={4}
+          value={value}
+          disabled={disabled || loading}
+          onChange={e => handleContentChange(e.target.value)}
+          onKeyDown={handleKeyDown}
+          onScroll={syncHighlightScroll}
+        />
+
+        {!isEditing && (
+          <div
+            ref={setActionContainerRef}
+            className="absolute bottom-0 right-1 z-20 flex items-end gap-1"
+          >
+            <div
+              className={cn(
+                'z-20 flex h-8 w-8 items-center justify-center rounded-lg transition-opacity',
+                shouldDisableMentionButton
+                  ? 'cursor-not-allowed opacity-40'
+                  : 'cursor-pointer hover:bg-state-base-hover',
+              )}
+              onClick={shouldDisableMentionButton ? undefined : handleMentionButtonClick}
+            >
+              <RiAtLine className="h-4 w-4 text-text-tertiary" />
+            </div>
+            <Button
+              className='z-20 ml-2 w-8 px-0'
+              variant='primary'
+              disabled={!value.trim() || disabled || loading}
+              onClick={handleSubmit}
+            >
+              {loading
+                ? <RiLoader2Line className='h-4 w-4 animate-spin text-components-button-primary-text' />
+                : <RiArrowUpLine className='h-4 w-4 text-components-button-primary-text' />}
+            </Button>
+          </div>
+        )}
+
+        {isEditing && (
+          <div
+            ref={setActionContainerRef}
+            className="absolute bottom-0 left-1 right-1 z-20 flex items-end justify-between"
+          >
+            <div
+              className={cn(
+                'z-20 flex h-8 w-8 items-center justify-center rounded-lg transition-opacity',
+                shouldDisableMentionButton
+                  ? 'cursor-not-allowed opacity-40'
+                  : 'cursor-pointer hover:bg-state-base-hover',
+              )}
+              onClick={shouldDisableMentionButton ? undefined : handleMentionButtonClick}
+            >
+              <RiAtLine className="h-4 w-4 text-text-tertiary" />
+            </div>
+            <div
+              ref={setActionRightRef}
+              className='flex items-center gap-2'
+            >
+              <Button variant='secondary' size='small' onClick={onCancel} disabled={loading}>
+                {t('common.operation.cancel')}
+              </Button>
+              <Button
+                variant='primary'
+                size='small'
+                disabled={loading || !value.trim()}
+                onClick={() => handleSubmit()}
+                className='gap-1'
+              >
+                {loading && <RiLoader2Line className='mr-1 h-3.5 w-3.5 animate-spin' />}
+                <span>{t('common.operation.save')}</span>
+                {!loading && (
+                  <EnterKey className='h-4 w-4' />
+                )}
+              </Button>
+            </div>
+          </div>
+        )}
+      </div>
+
+      {showMentionDropdown && filteredMentionUsers.length > 0 && typeof document !== 'undefined' && createPortal(
+        <div
+          className="bg-components-panel-bg/95 fixed z-[9999] max-h-[248px] w-[280px] overflow-y-auto rounded-xl border-[0.5px] border-components-panel-border shadow-lg backdrop-blur-[10px]"
+          style={{
+            left: dropdownPosition.x,
+            [dropdownPosition.placement === 'top' ? 'bottom' : 'top']: dropdownPosition.placement === 'top'
+              ? window.innerHeight - dropdownPosition.y
+              : dropdownPosition.y,
+          }}
+          data-mention-dropdown
+        >
+          {filteredMentionUsers.map((user, index) => (
+            <div
+              key={user.id}
+              className={cn(
+                'flex cursor-pointer items-center gap-2 rounded-md py-1 pl-2 pr-3 hover:bg-state-base-hover',
+                index === selectedMentionIndex && 'bg-state-base-hover',
+              )}
+              onClick={() => insertMention(user)}
+            >
+              <Avatar
+                avatar={user.avatar_url || null}
+                name={user.name}
+                size={24}
+                className="shrink-0"
+              />
+              <div className="min-w-0 flex-1">
+                <div className="truncate text-sm font-medium text-text-primary">
+                  {user.name}
+                </div>
+                <div className="truncate text-xs text-text-tertiary">
+                  {user.email}
+                </div>
+              </div>
+            </div>
+          ))}
+        </div>,
+        document.body,
+      )}
+    </>
+  )
+})
+
+MentionInputInner.displayName = 'MentionInputInner'
+
+export const MentionInput = memo(MentionInputInner)

web/app/components/workflow/comment/thread.tsx

@@ -0,0 +1,618 @@
+'use client'
+
+import type { FC, ReactNode } from 'react'
+import { memo, useCallback, useEffect, useMemo, useRef, useState } from 'react'
+import { useParams } from 'next/navigation'
+import { useReactFlow, useViewport } from 'reactflow'
+import { useTranslation } from 'react-i18next'
+import { RiArrowDownSLine, RiArrowUpSLine, RiCheckboxCircleFill, RiCheckboxCircleLine, RiCloseLine, RiDeleteBinLine, RiMoreFill } from '@remixicon/react'
+import Avatar from '@/app/components/base/avatar'
+import Divider from '@/app/components/base/divider'
+import Tooltip from '@/app/components/base/tooltip'
+import InlineDeleteConfirm from '@/app/components/base/inline-delete-confirm'
+import { PortalToFollowElem, PortalToFollowElemContent, PortalToFollowElemTrigger } from '@/app/components/base/portal-to-follow-elem'
+import cn from '@/utils/classnames'
+import { useFormatTimeFromNow } from '@/hooks/use-format-time-from-now'
+import type { WorkflowCommentDetail, WorkflowCommentDetailReply } from '@/service/workflow-comment'
+import { useAppContext } from '@/context/app-context'
+import { MentionInput } from './mention-input'
+import { getUserColor } from '@/app/components/workflow/collaboration/utils/user-color'
+import { useStore } from '../store'
+
+type CommentThreadProps = {
+  comment: WorkflowCommentDetail
+  loading?: boolean
+  replySubmitting?: boolean
+  replyUpdating?: boolean
+  onClose: () => void
+  onDelete?: () => void
+  onResolve?: () => void
+  onPrev?: () => void
+  onNext?: () => void
+  canGoPrev?: boolean
+  canGoNext?: boolean
+  onReply?: (content: string, mentionedUserIds?: string[]) => Promise<void> | void
+  onReplyEdit?: (replyId: string, content: string, mentionedUserIds?: string[]) => Promise<void> | void
+  onReplyDelete?: (replyId: string) => void
+  onReplyDeleteDirect?: (replyId: string) => Promise<void> | void
+}
+
+const ThreadMessage: FC<{
+  authorId: string
+  authorName: string
+  avatarUrl?: string | null
+  createdAt: number
+  content: string
+  mentionableNames: string[]
+  className?: string
+}> = ({ authorId, authorName, avatarUrl, createdAt, content, mentionableNames, className }) => {
+  const { formatTimeFromNow } = useFormatTimeFromNow()
+  const { userProfile } = useAppContext()
+  const currentUserId = userProfile?.id
+  const isCurrentUser = authorId === currentUserId
+  const userColor = isCurrentUser ? undefined : getUserColor(authorId)
+
+  const highlightedContent = useMemo<ReactNode>(() => {
+    if (!content)
+      return ''
+
+    // Extract valid user names from mentionableNames, sorted by length (longest first)
+    const normalizedNames = Array.from(new Set(mentionableNames
+      .map(name => name.trim())
+      .filter(Boolean)))
+    normalizedNames.sort((a, b) => b.length - a.length)
+
+    if (normalizedNames.length === 0)
+      return content
+
+    const segments: ReactNode[] = []
+    let hasMention = false
+    let cursor = 0
+
+    while (cursor < content.length) {
+      let nextMatchStart = -1
+      let matchedName = ''
+
+      for (const name of normalizedNames) {
+        const searchStart = content.indexOf(`@${name}`, cursor)
+        if (searchStart === -1)
+          continue
+
+        const previousChar = searchStart > 0 ? content[searchStart - 1] : ''
+        if (searchStart > 0 && !/\s/.test(previousChar))
+          continue
+
+        if (
+          nextMatchStart === -1
+          || searchStart < nextMatchStart
+          || (searchStart === nextMatchStart && name.length > matchedName.length)
+        ) {
+          nextMatchStart = searchStart
+          matchedName = name
+        }
+      }
+
+      if (nextMatchStart === -1)
+        break
+
+      if (nextMatchStart > cursor)
+        segments.push(<span key={`text-${cursor}`}>{content.slice(cursor, nextMatchStart)}</span>)
+
+      const mentionEnd = nextMatchStart + matchedName.length + 1
+      segments.push(
+        <span key={`mention-${nextMatchStart}`} className='text-primary-600'>
+          {content.slice(nextMatchStart, mentionEnd)}
+        </span>,
+      )
+      hasMention = true
+      cursor = mentionEnd
+    }
+
+    if (!hasMention)
+      return content
+
+    if (cursor < content.length)
+      segments.push(<span key={`text-${cursor}`}>{content.slice(cursor)}</span>)
+
+    return segments
+  }, [content, mentionableNames])
+
+  return (
+    <div className={cn('flex gap-3 pt-1', className)}>
+      <div className='shrink-0'>
+        <Avatar
+          name={authorName}
+          avatar={avatarUrl || null}
+          size={24}
+          className={cn('h-8 w-8 rounded-full')}
+          backgroundColor={userColor}
+        />
+      </div>
+      <div className='min-w-0 flex-1 pb-4 text-text-primary last:pb-0'>
+        <div className='flex flex-wrap items-center gap-x-2 gap-y-1'>
+          <span className='system-sm-medium text-text-primary'>{authorName}</span>
+          <span className='system-2xs-regular text-text-tertiary'>{formatTimeFromNow(createdAt * 1000)}</span>
+        </div>
+        <div className='system-sm-regular mt-1 whitespace-pre-wrap break-words text-text-secondary'>
+          {highlightedContent}
+        </div>
+      </div>
+    </div>
+  )
+}
+
+export const CommentThread: FC<CommentThreadProps> = memo(({
+  comment,
+  loading = false,
+  replySubmitting = false,
+  replyUpdating = false,
+  onClose,
+  onDelete,
+  onResolve,
+  onPrev,
+  onNext,
+  canGoPrev,
+  canGoNext,
+  onReply,
+  onReplyEdit,
+  onReplyDelete,
+  onReplyDeleteDirect,
+}) => {
+  const params = useParams()
+  const appId = params.appId as string
+  const { flowToScreenPosition } = useReactFlow()
+  const viewport = useViewport()
+  const { userProfile } = useAppContext()
+  const { t } = useTranslation()
+  const [replyContent, setReplyContent] = useState('')
+  const [activeReplyMenuId, setActiveReplyMenuId] = useState<string | null>(null)
+  const [editingReply, setEditingReply] = useState<{ id: string; content: string }>({ id: '', content: '' })
+  const [deletingReplyId, setDeletingReplyId] = useState<string | null>(null)
+  const [isSubmittingEdit, setIsSubmittingEdit] = useState(false)
+
+  // Focus management refs
+  const replyInputRef = useRef<HTMLTextAreaElement>(null)
+  const threadRef = useRef<HTMLDivElement>(null)
+
+  // Get mentionable users from store
+  const mentionUsersFromStore = useStore(state => (
+    appId ? state.mentionableUsersCache[appId] : undefined
+  ))
+  const mentionUsers = mentionUsersFromStore ?? []
+
+  // Extract all mentionable names for highlighting
+  const mentionableNames = useMemo(() => {
+    const names = mentionUsers
+      .map(user => user.name?.trim())
+      .filter((name): name is string => Boolean(name))
+    return Array.from(new Set(names))
+  }, [mentionUsers])
+
+  useEffect(() => {
+    setReplyContent('')
+  }, [comment.id])
+
+  // P0: Auto-focus reply input when thread opens or comment changes
+  useEffect(() => {
+    const timer = setTimeout(() => {
+      if (replyInputRef.current && !editingReply.id && onReply)
+        replyInputRef.current.focus()
+    }, 100)
+
+    return () => clearTimeout(timer)
+  }, [comment.id, editingReply.id, onReply])
+
+  // P2: Handle Esc key to close thread
+  useEffect(() => {
+    const handleKeyDown = (e: KeyboardEvent) => {
+      // Don't intercept if actively editing a reply
+      if (editingReply.id) return
+
+      // Don't intercept if mention dropdown is open (let MentionInput handle it)
+      if (document.querySelector('[data-mention-dropdown]')) return
+
+      if (e.key === 'Escape') {
+        e.preventDefault()
+        e.stopPropagation()
+        onClose()
+      }
+    }
+
+    document.addEventListener('keydown', handleKeyDown, true)
+    return () => document.removeEventListener('keydown', handleKeyDown, true)
+  }, [onClose, editingReply.id])
+
+  const handleReplySubmit = useCallback(async (content: string, mentionedUserIds: string[]) => {
+    if (!onReply || replySubmitting) return
+
+    setReplyContent('')
+
+    try {
+      await onReply(content, mentionedUserIds)
+
+      // P0: Restore focus to reply input after successful submission
+      setTimeout(() => {
+        replyInputRef.current?.focus()
+      }, 0)
+    }
+    catch (error) {
+      console.error('Failed to send reply', error)
+      setReplyContent(content)
+    }
+  }, [onReply, replySubmitting])
+
+  const screenPosition = useMemo(() => {
+    return flowToScreenPosition({
+      x: comment.position_x,
+      y: comment.position_y,
+    })
+  }, [comment.position_x, comment.position_y, viewport.x, viewport.y, viewport.zoom, flowToScreenPosition])
+  const workflowContainerRect = typeof document !== 'undefined'
+    ? document.getElementById('workflow-container')?.getBoundingClientRect()
+    : null
+  const containerLeft = workflowContainerRect?.left ?? 0
+  const containerTop = workflowContainerRect?.top ?? 0
+  const canvasPosition = useMemo(() => ({
+    x: screenPosition.x - containerLeft,
+    y: screenPosition.y - containerTop,
+  }), [screenPosition.x, screenPosition.y, containerLeft, containerTop])
+
+  const handleStartEdit = useCallback((reply: WorkflowCommentDetailReply) => {
+    setEditingReply({ id: reply.id, content: reply.content })
+    setActiveReplyMenuId(null)
+  }, [])
+
+  const handleCancelEdit = useCallback(() => {
+    setEditingReply({ id: '', content: '' })
+
+    // P1: Restore focus to reply input after canceling edit
+    setTimeout(() => {
+      replyInputRef.current?.focus()
+    }, 0)
+  }, [])
+
+  const handleEditSubmit = useCallback(async (content: string, mentionedUserIds: string[]) => {
+    if (!onReplyEdit || !editingReply) return
+    const trimmed = content.trim()
+    if (!trimmed) return
+
+    setIsSubmittingEdit(true)
+    try {
+      await onReplyEdit(editingReply.id, trimmed, mentionedUserIds)
+      setEditingReply({ id: '', content: '' })
+
+      // P1: Restore focus to reply input after saving edit
+      setTimeout(() => {
+        replyInputRef.current?.focus()
+      }, 0)
+    }
+    catch (error) {
+      console.error('Failed to edit reply', error)
+    }
+    finally {
+      setIsSubmittingEdit(false)
+    }
+  }, [editingReply, onReplyEdit])
+
+  const replies = comment.replies || []
+  const messageListRef = useRef<HTMLDivElement>(null)
+  const previousReplyCountRef = useRef<number | undefined>(undefined)
+  const previousCommentIdRef = useRef<string | undefined>(undefined)
+
+  // Close dropdown when scrolling
+  useEffect(() => {
+    const container = messageListRef.current
+    if (!container || !activeReplyMenuId)
+      return
+
+    const handleScroll = () => {
+      setActiveReplyMenuId(null)
+    }
+
+    container.addEventListener('scroll', handleScroll)
+    return () => container.removeEventListener('scroll', handleScroll)
+  }, [activeReplyMenuId])
+
+  // Auto-scroll to bottom on new messages
+  useEffect(() => {
+    const container = messageListRef.current
+    if (!container)
+      return
+
+    const isFirstRender = previousCommentIdRef.current === undefined
+    const isNewComment = comment.id !== previousCommentIdRef.current
+    const hasNewReply = previousReplyCountRef.current !== undefined
+      && replies.length > previousReplyCountRef.current
+
+    // Scroll on first render, new comment, or new reply
+    if (isFirstRender || isNewComment || hasNewReply) {
+      container.scrollTo({
+        top: container.scrollHeight,
+        behavior: 'smooth',
+      })
+    }
+
+    previousCommentIdRef.current = comment.id
+    previousReplyCountRef.current = replies.length
+  }, [comment.id, replies.length])
+
+  return (
+    <div
+      className='absolute z-50 w-[360px] max-w-[360px]'
+      style={{
+        left: canvasPosition.x + 40,
+        top: canvasPosition.y,
+        transform: 'translateY(-20%)',
+      }}
+    >
+      <div
+        ref={threadRef}
+        className='relative flex h-[360px] flex-col overflow-hidden rounded-2xl border border-components-panel-border bg-components-panel-bg shadow-xl'
+        role='dialog'
+        aria-modal='true'
+        aria-labelledby='comment-thread-title'
+      >
+        <div className='flex items-center justify-between rounded-t-2xl border-b border-components-panel-border bg-components-panel-bg-blur px-4 py-3'>
+          <div
+            id='comment-thread-title'
+            className='font-semibold uppercase text-text-primary'
+          >
+            {t('workflow.comments.panelTitle')}
+          </div>
+          <div className='flex items-center gap-1'>
+            <Tooltip
+              popupContent={t('workflow.comments.aria.deleteComment')}
+              position='top'
+              popupClassName='!px-2 !py-1.5'
+            >
+              <button
+                type='button'
+                disabled={loading}
+                className={cn('flex h-6 w-6 items-center justify-center rounded-lg text-text-tertiary hover:bg-state-destructive-hover hover:text-text-destructive disabled:cursor-not-allowed disabled:text-text-disabled disabled:hover:bg-transparent disabled:hover:text-text-disabled')}
+                onClick={onDelete}
+                aria-label={t('workflow.comments.aria.deleteComment')}
+              >
+                <RiDeleteBinLine className='h-4 w-4' />
+              </button>
+            </Tooltip>
+            <Tooltip
+              popupContent={t('workflow.comments.aria.resolveComment')}
+              position='top'
+              popupClassName='!px-2 !py-1.5'
+            >
+              <button
+                type='button'
+                disabled={comment.resolved || loading}
+                className={cn('flex h-6 w-6 items-center justify-center rounded-lg text-text-tertiary hover:bg-state-base-hover hover:text-text-secondary disabled:cursor-not-allowed disabled:text-text-disabled disabled:hover:bg-transparent disabled:hover:text-text-disabled')}
+                onClick={onResolve}
+                aria-label={t('workflow.comments.aria.resolveComment')}
+              >
+                {comment.resolved ? <RiCheckboxCircleFill className='h-4 w-4' /> : <RiCheckboxCircleLine className='h-4 w-4' />}
+              </button>
+            </Tooltip>
+            <Divider type='vertical' className='h-3.5' />
+            <Tooltip
+              popupContent={t('workflow.comments.aria.previousComment')}
+              position='top'
+              popupClassName='!px-2 !py-1.5'
+            >
+              <button
+                type='button'
+                disabled={!canGoPrev || loading}
+                className={cn('flex h-6 w-6 items-center justify-center rounded-lg text-text-tertiary hover:bg-state-base-hover hover:text-text-secondary disabled:cursor-not-allowed disabled:text-text-disabled disabled:hover:bg-transparent disabled:hover:text-text-disabled')}
+                onClick={onPrev}
+                aria-label={t('workflow.comments.aria.previousComment')}
+              >
+                <RiArrowUpSLine className='h-4 w-4' />
+              </button>
+            </Tooltip>
+            <Tooltip
+              popupContent={t('workflow.comments.aria.nextComment')}
+              position='top'
+              popupClassName='!px-2 !py-1.5'
+            >
+              <button
+                type='button'
+                disabled={!canGoNext || loading}
+                className={cn('flex h-6 w-6 items-center justify-center rounded-lg text-text-tertiary hover:bg-state-base-hover hover:text-text-secondary disabled:cursor-not-allowed disabled:text-text-disabled disabled:hover:bg-transparent disabled:hover:text-text-disabled')}
+                onClick={onNext}
+                aria-label={t('workflow.comments.aria.nextComment')}
+              >
+                <RiArrowDownSLine className='h-4 w-4' />
+              </button>
+            </Tooltip>
+            <button
+              type='button'
+              className='flex h-6 w-6 items-center justify-center rounded-lg text-text-tertiary hover:bg-state-base-hover hover:text-text-secondary'
+              onClick={onClose}
+              aria-label={t('workflow.comments.aria.closeComment')}
+            >
+              <RiCloseLine className='h-4 w-4' />
+            </button>
+          </div>
+        </div>
+        <div
+          ref={messageListRef}
+          className='relative mt-2 flex-1 overflow-y-auto px-4 pb-4'
+        >
+          <div className='-mx-4 rounded-lg px-4 py-2 transition-colors hover:bg-components-panel-on-panel-item-bg-hover'>
+            <ThreadMessage
+              authorId={comment.created_by_account?.id || ''}
+              authorName={comment.created_by_account?.name || t('workflow.comments.fallback.user')}
+              avatarUrl={comment.created_by_account?.avatar_url || null}
+              createdAt={comment.created_at}
+              content={comment.content}
+              mentionableNames={mentionableNames}
+            />
+          </div>
+          {replies.length > 0 && (
+            <div className='mt-2 space-y-3 pt-3'>
+              {replies.map((reply) => {
+                const isReplyEditing = editingReply?.id === reply.id
+                const isOwnReply = reply.created_by_account?.id === userProfile?.id
+                return (
+                  <div
+                    key={reply.id}
+                    className='group relative -mx-4 rounded-lg px-4 py-2 transition-colors hover:bg-components-panel-on-panel-item-bg-hover'
+                  >
+                    {isOwnReply && !isReplyEditing && (
+                      <PortalToFollowElem
+                        placement='bottom-end'
+                        open={activeReplyMenuId === reply.id}
+                        onOpenChange={(open) => {
+                          if (!open) {
+                            setDeletingReplyId(null)
+                            setActiveReplyMenuId(null)
+                          }
+                        }}
+                      >
+                        <div
+                          className={cn(
+                            'absolute right-1 top-1 gap-1',
+                            activeReplyMenuId === reply.id ? 'flex' : 'hidden group-hover:flex',
+                          )}
+                          data-reply-menu
+                        >
+                          <PortalToFollowElemTrigger asChild>
+                            <button
+                              type='button'
+                              className='flex h-6 w-6 items-center justify-center rounded-md text-text-tertiary hover:bg-state-base-hover hover:text-text-secondary'
+                              onClick={(e) => {
+                                e.stopPropagation()
+                                setDeletingReplyId(null)
+                                setActiveReplyMenuId(prev => prev === reply.id ? null : reply.id)
+                              }}
+                              aria-label={t('workflow.comments.aria.replyActions')}
+                            >
+                              <RiMoreFill className='h-4 w-4' />
+                            </button>
+                          </PortalToFollowElemTrigger>
+                        </div>
+                        <PortalToFollowElemContent
+                          className='z-[100] w-36 rounded-xl border-[0.5px] border-components-panel-border bg-components-panel-bg-blur shadow-lg backdrop-blur-[10px]'
+                          data-reply-menu
+                        >
+                          {/* Menu buttons - hidden when showing delete confirm */}
+                          <div className={cn(deletingReplyId === reply.id ? 'hidden' : 'block')}>
+                            <button
+                              className='flex w-full items-center justify-start rounded-t-xl px-3 py-2 text-left text-sm text-text-secondary hover:bg-state-base-hover'
+                              onClick={(e) => {
+                                e.stopPropagation()
+                                handleStartEdit(reply)
+                              }}
+                            >
+                              {t('workflow.comments.actions.editReply')}
+                            </button>
+                            <button
+                              className='text-negative flex w-full items-center justify-start rounded-b-xl px-3 py-2 text-left text-sm text-text-secondary hover:bg-state-base-hover'
+                              onClick={(e) => {
+                                e.stopPropagation()
+                                e.preventDefault()
+                                if (onReplyDeleteDirect) {
+                                  setDeletingReplyId(reply.id)
+                                }
+                                else {
+                                  setActiveReplyMenuId(null)
+                                  onReplyDelete?.(reply.id)
+                                }
+                              }}
+                            >
+                              {t('workflow.comments.actions.deleteReply')}
+                            </button>
+                          </div>
+
+                          {/* Delete confirmation - shown when deletingReplyId matches */}
+                          <div className={cn(deletingReplyId === reply.id ? 'block' : 'hidden')}>
+                            <InlineDeleteConfirm
+                              title={t('workflow.comments.actions.deleteReply')}
+                              onConfirm={() => {
+                                setDeletingReplyId(null)
+                                setActiveReplyMenuId(null)
+                                onReplyDeleteDirect?.(reply.id)
+                              }}
+                              onCancel={() => {
+                                setDeletingReplyId(null)
+                              }}
+                              className='m-0 w-full border-0 shadow-none'
+                            />
+                          </div>
+                        </PortalToFollowElemContent>
+                      </PortalToFollowElem>
+                    )}
+                    {isReplyEditing ? (
+                      <div className='flex gap-3 pt-1'>
+                        <div className='shrink-0'>
+                          <Avatar
+                            name={reply.created_by_account?.name || t('workflow.comments.fallback.user')}
+                            avatar={reply.created_by_account?.avatar_url || null}
+                            size={24}
+                            className='h-8 w-8 rounded-full'
+                          />
+                        </div>
+                        <div className='min-w-0 flex-1'>
+                          <div className='rounded-xl border border-components-chat-input-border bg-components-panel-bg-blur p-1 shadow-md backdrop-blur-[10px]'>
+                            <MentionInput
+                              value={editingReply?.content ?? ''}
+                              onChange={newContent => setEditingReply(prev => prev ? { ...prev, content: newContent } : prev)}
+                              onSubmit={handleEditSubmit}
+                              onCancel={handleCancelEdit}
+                              placeholder={t('workflow.comments.placeholder.editReply')}
+                              disabled={loading}
+                              loading={replyUpdating || isSubmittingEdit}
+                              isEditing={true}
+                              className="system-sm-regular"
+                              autoFocus
+                            />
+                          </div>
+                        </div>
+                      </div>
+                    ) : (
+                      <ThreadMessage
+                        authorId={reply.created_by_account?.id || ''}
+                        authorName={reply.created_by_account?.name || t('workflow.comments.fallback.user')}
+                        avatarUrl={reply.created_by_account?.avatar_url || null}
+                        createdAt={reply.created_at}
+                        content={reply.content}
+                        mentionableNames={mentionableNames}
+                      />
+                    )}
+                  </div>
+                )
+              })}
+            </div>
+          )}
+        </div>
+        {loading && (
+          <div className='bg-components-panel-bg/70 absolute inset-0 z-30 flex items-center justify-center text-sm text-text-tertiary'>
+            {t('workflow.comments.loading')}
+          </div>
+        )}
+        {onReply && (
+          <div className='border-t border-components-panel-border px-4 py-3'>
+            <div className='flex items-center gap-3'>
+              <Avatar
+                avatar={userProfile?.avatar_url || null}
+                name={userProfile?.name || t('common.you')}
+                size={24}
+                className='h-8 w-8'
+              />
+              <div className='flex-1 rounded-xl border border-components-chat-input-border bg-components-panel-bg-blur p-[2px] shadow-sm'>
+                <MentionInput
+                  ref={replyInputRef}
+                  value={replyContent}
+                  onChange={setReplyContent}
+                  onSubmit={handleReplySubmit}
+                  placeholder={t('workflow.comments.placeholder.reply')}
+                  disabled={loading}
+                  loading={replySubmitting}
+                />
+              </div>
+            </div>
+          </div>
+        )}
+      </div>
+    </div>
+  )
+})
+
+CommentThread.displayName = 'CommentThread'

web/app/components/workflow/features.tsx

@@ -7,21 +7,23 @@ import { useStore } from './store'
 import {
   useIsChatMode,
   useNodesReadOnly,
-  useNodesSyncDraft,
 } from './hooks'
 import { type CommonNodeType, type InputVar, InputVarType, type Node } from './types'
 import useConfig from './nodes/start/use-config'
 import type { StartNodeType } from './nodes/start/types'
 import type { PromptVariable } from '@/models/debug'
 import NewFeaturePanel from '@/app/components/base/features/new-feature-panel'
+import { webSocketClient } from '@/app/components/workflow/collaboration/core/websocket-manager'
+import { useFeaturesStore } from '@/app/components/base/features/hooks'
+import { type WorkflowDraftFeaturesPayload, updateFeatures } from '@/service/workflow'
 
 const Features = () => {
   const setShowFeaturesPanel = useStore(s => s.setShowFeaturesPanel)
+  const appId = useStore(s => s.appId)
   const isChatMode = useIsChatMode()
   const { nodesReadOnly } = useNodesReadOnly()
-  const { handleSyncWorkflowDraft } = useNodesSyncDraft()
+  const featuresStore = useFeaturesStore()
   const nodes = useNodes<CommonNodeType>()
-
   const startNode = nodes.find(node => node.data.type === 'start')
   const { id, data } = startNode as Node<StartNodeType>
   const { handleAddVariable } = useConfig(id, data)
@@ -39,10 +41,45 @@ const Features = () => {
     handleAddVariable(startNodeVariable)
   }
 
-  const handleFeaturesChange = useCallback(() => {
-    handleSyncWorkflowDraft()
+  const handleFeaturesChange = useCallback(async () => {
+    if (!appId || !featuresStore) return
+
+    try {
+      const currentFeatures = featuresStore.getState().features
+
+      // Transform features to match the expected server format (same as doSyncWorkflowDraft)
+      const transformedFeatures: WorkflowDraftFeaturesPayload = {
+        opening_statement: currentFeatures.opening?.enabled ? (currentFeatures.opening?.opening_statement || '') : '',
+        suggested_questions: currentFeatures.opening?.enabled ? (currentFeatures.opening?.suggested_questions || []) : [],
+        suggested_questions_after_answer: currentFeatures.suggested,
+        text_to_speech: currentFeatures.text2speech,
+        speech_to_text: currentFeatures.speech2text,
+        retriever_resource: currentFeatures.citation,
+        sensitive_word_avoidance: currentFeatures.moderation,
+        file_upload: currentFeatures.file,
+      }
+
+      console.log('Sending features to server:', transformedFeatures)
+
+      await updateFeatures({
+        appId,
+        features: transformedFeatures,
+      })
+
+      // Emit update event to other connected clients
+      const socket = webSocketClient.getSocket(appId)
+      if (socket) {
+        socket.emit('collaboration_event', {
+          type: 'vars_and_features_update',
+        })
+      }
+    }
+    catch (error) {
+      console.error('Failed to update features:', error)
+    }
+
     setShowFeaturesPanel(true)
-  }, [handleSyncWorkflowDraft, setShowFeaturesPanel])
+  }, [appId, featuresStore, setShowFeaturesPanel])
 
   return (
     <NewFeaturePanel

web/app/components/workflow/header/header-in-normal.tsx

@@ -18,6 +18,7 @@ import RunAndHistory from './run-and-history'
 import EditingTitle from './editing-title'
 import EnvButton from './env-button'
 import VersionHistoryButton from './version-history-button'
+import OnlineUsers from './online-users'
 import { useInputFieldPanel } from '@/app/components/rag-pipeline/hooks'
 import ScrollToSelectedNodeButton from './scroll-to-selected-node-button'
 import GlobalVariableButton from './global-variable-button'
@@ -72,8 +73,11 @@ const HeaderInNormal = ({
         <ScrollToSelectedNodeButton />
       </div>
       <div className='flex items-center gap-2'>
+        <OnlineUsers />
         {components?.left}
         <Divider type='vertical' className='mx-auto h-3.5' />
+        <EnvButton disabled={nodesReadOnly} />
+        <Divider type='vertical' className='mx-auto h-3.5' />
         <RunAndHistory {...runAndHistoryProps} />
         <div className='shrink-0 cursor-pointer rounded-lg border-[0.5px] border-components-button-secondary-border bg-components-button-secondary-bg shadow-xs backdrop-blur-[10px]'>
           {components?.chatVariableTrigger}

web/app/components/workflow/header/header-in-restoring.tsx

@@ -19,8 +19,10 @@ import RestoringTitle from './restoring-title'
 import Button from '@/app/components/base/button'
 import { useInvalidAllLastRun } from '@/service/use-workflow'
 import { useHooksStore } from '../hooks-store'
+import { useStore as useAppStore } from '@/app/components/app/store'
 import useTheme from '@/hooks/use-theme'
 import cn from '@/utils/classnames'
+import { collaborationManager } from '../collaboration/core/collaboration-manager'
 
 export type HeaderInRestoringProps = {
   onRestoreSettled?: () => void
@@ -31,6 +33,7 @@ const HeaderInRestoring = ({
   const { t } = useTranslation()
   const { theme } = useTheme()
   const workflowStore = useWorkflowStore()
+  const appDetail = useAppStore.getState().appDetail
   const configsMap = useHooksStore(s => s.configsMap)
   const invalidAllLastRun = useInvalidAllLastRun(configsMap?.flowType, configsMap?.flowId)
   const {
@@ -60,6 +63,9 @@ const HeaderInRestoring = ({
           type: 'success',
           message: t('workflow.versionHistory.action.restoreSuccess'),
         })
+        // Notify other collaboration clients about the workflow restore
+        if (appDetail)
+          collaborationManager.emitWorkflowUpdate(appDetail.id)
       },
       onError: () => {
         Toast.notify({
@@ -70,10 +76,10 @@ const HeaderInRestoring = ({
       onSettled: () => {
         onRestoreSettled?.()
       },
-    })
+    }, true) // Enable forceUpload for restore operation
     deleteAllInspectVars()
     invalidAllLastRun()
-  }, [setShowWorkflowVersionHistoryPanel, workflowStore, handleSyncWorkflowDraft, deleteAllInspectVars, invalidAllLastRun, t, onRestoreSettled])
+  }, [setShowWorkflowVersionHistoryPanel, workflowStore, handleSyncWorkflowDraft, deleteAllInspectVars, invalidAllLastRun, t, onRestoreSettled, appDetail])
 
   return (
     <>

web/app/components/workflow/header/online-users.tsx

@@ -0,0 +1,238 @@
+'use client'
+import { useEffect, useState } from 'react'
+import { useReactFlow } from 'reactflow'
+import Avatar from '@/app/components/base/avatar'
+import { useCollaboration } from '../collaboration/hooks/use-collaboration'
+import { useStore } from '../store'
+import cn from '@/utils/classnames'
+import { ChevronDownIcon } from '@heroicons/react/20/solid'
+import { getUserColor } from '../collaboration/utils/user-color'
+import Tooltip from '@/app/components/base/tooltip'
+import {
+  PortalToFollowElem,
+  PortalToFollowElemContent,
+  PortalToFollowElemTrigger,
+} from '@/app/components/base/portal-to-follow-elem'
+import { useAppContext } from '@/context/app-context'
+import { getAvatar } from '@/service/common'
+
+const useAvatarUrls = (users: any[]) => {
+  const [avatarUrls, setAvatarUrls] = useState<Record<string, string>>({})
+
+  useEffect(() => {
+    const fetchAvatars = async () => {
+      const newAvatarUrls: Record<string, string> = {}
+
+      await Promise.all(
+        users.map(async (user) => {
+          if (user.avatar) {
+            try {
+              const response = await getAvatar({ avatar: user.avatar })
+              newAvatarUrls[user.sid] = response.avatar_url
+            }
+            catch (error) {
+              console.error('Failed to fetch avatar:', error)
+              newAvatarUrls[user.sid] = user.avatar
+            }
+          }
+        }),
+      )
+
+      setAvatarUrls(newAvatarUrls)
+    }
+
+    if (users.length > 0)
+      fetchAvatars()
+  }, [users])
+
+  return avatarUrls
+}
+
+const OnlineUsers = () => {
+  const appId = useStore(s => s.appId)
+  const { onlineUsers, cursors, isEnabled: isCollaborationEnabled } = useCollaboration(appId as string)
+  const { userProfile } = useAppContext()
+  const reactFlow = useReactFlow()
+  const [dropdownOpen, setDropdownOpen] = useState(false)
+  const avatarUrls = useAvatarUrls(onlineUsers || [])
+
+  const currentUserId = userProfile?.id
+
+  const renderDisplayName = (
+    user: any,
+    baseClassName: string,
+    suffixClassName: string,
+  ) => {
+    const baseName = user.username || 'User'
+    const isCurrentUser = user.user_id === currentUserId
+
+    return (
+      <span className={cn('inline-flex items-center gap-1', baseClassName)}>
+        <span>{baseName}</span>
+        {isCurrentUser && (
+          <span className={suffixClassName}>
+            (You)
+          </span>
+        )}
+      </span>
+    )
+  }
+
+  // Function to jump to user's cursor position
+  const jumpToUserCursor = (userId: string) => {
+    const cursor = cursors[userId]
+    if (!cursor) return
+
+    // Convert world coordinates to center the view on the cursor
+    reactFlow.setCenter(cursor.x, cursor.y, { zoom: 1, duration: 800 })
+  }
+
+  if (!isCollaborationEnabled || !onlineUsers || onlineUsers.length === 0)
+    return null
+
+  // Display logic:
+  // 1-3 users: show all avatars
+  // 4+ users: show 2 avatars + count + arrow
+  const shouldShowCount = onlineUsers.length >= 4
+  const maxVisible = shouldShowCount ? 2 : 3
+  const visibleUsers = onlineUsers.slice(0, maxVisible)
+  const remainingCount = onlineUsers.length - maxVisible
+
+  const getAvatarUrl = (user: any) => {
+    return avatarUrls[user.sid] || user.avatar
+  }
+
+  const hasCounter = remainingCount > 0
+
+  return (
+    <div
+      className={cn(
+        'flex h-8 items-center rounded-full border-[0.5px] border-components-panel-border',
+        'bg-components-panel-bg py-1 shadow-xs shadow-shadow-shadow-3 backdrop-blur-[10px]',
+        hasCounter ? 'min-w-[87px] gap-px pl-1 pr-1.5' : 'gap-1 px-1.5',
+      )}
+    >
+      <div className="flex h-6 items-center">
+        <div className="flex items-center">
+          {visibleUsers.map((user, index) => {
+            const isCurrentUser = user.user_id === currentUserId
+            const userColor = isCurrentUser ? undefined : getUserColor(user.user_id)
+            return (
+              <Tooltip
+                key={`${user.sid}-${index}`}
+                popupContent={renderDisplayName(
+                  user,
+                  'system-xs-medium text-text-secondary',
+                  'text-text-quaternary',
+                )}
+                position="bottom"
+                triggerMethod="hover"
+                needsDelay={false}
+                asChild
+                popupClassName="flex h-[28px] w-[85px] items-center justify-center gap-1 rounded-md border-[0.5px] border-components-panel-border bg-components-tooltip-bg px-3 py-[6px] shadow-lg shadow-shadow-shadow-5 backdrop-blur-[10px]"
+                noDecoration
+              >
+                <div
+                  className={cn(
+                    'relative flex size-6 items-center justify-center',
+                    index > 0 && '-ml-1.5',
+                    !isCurrentUser && 'cursor-pointer transition-transform hover:scale-110',
+                  )}
+                  style={{ zIndex: visibleUsers.length - index }}
+                  onClick={() => !isCurrentUser && jumpToUserCursor(user.user_id)}
+                >
+                  <Avatar
+                    name={user.username || 'User'}
+                    avatar={getAvatarUrl(user)}
+                    size={24}
+                    className="ring-1 ring-components-panel-bg"
+                    backgroundColor={userColor}
+                  />
+                </div>
+              </Tooltip>
+            )
+          })}
+          {remainingCount > 0 && (
+            <PortalToFollowElem
+              open={dropdownOpen}
+              onOpenChange={setDropdownOpen}
+              placement="bottom-start"
+              offset={{
+                mainAxis: 8,
+                crossAxis: -48,
+              }}
+            >
+              <PortalToFollowElemTrigger
+                onClick={() => setDropdownOpen(prev => !prev)}
+                asChild
+              >
+                <div className="flex items-center gap-1">
+                  <div
+                    className={cn(
+                      'flex h-6 w-6 cursor-pointer select-none items-center justify-center rounded-full bg-components-icon-bg-midnight-solid text-[10px] font-semibold uppercase leading-[12px] text-white ring-1 ring-components-panel-bg',
+                      visibleUsers.length > 0 && '-ml-1',
+                    )}
+                  >
+                    +{remainingCount}
+                  </div>
+                  <ChevronDownIcon className="h-3 w-3 cursor-pointer text-gray-500" />
+                </div>
+              </PortalToFollowElemTrigger>
+              <PortalToFollowElemContent
+                className="z-[9999]"
+              >
+                <div
+                  className={cn(
+                    'mt-1.5',
+                    'flex flex-col',
+                    'max-h-[200px] w-[240px] overflow-y-auto',
+                    'rounded-xl border-[0.5px] border-components-panel-border',
+                    'bg-components-panel-bg-blur p-1',
+                    'shadow-lg shadow-shadow-shadow-5',
+                    'backdrop-blur-[10px]',
+                  )}
+                >
+                  {onlineUsers.map((user) => {
+                    const isCurrentUser = user.user_id === currentUserId
+                    const userColor = isCurrentUser ? undefined : getUserColor(user.user_id)
+                    return (
+                      <div
+                        key={user.sid}
+                        className={cn(
+                          'flex items-center gap-2 rounded-lg px-3 py-1.5',
+                          !isCurrentUser && 'cursor-pointer hover:bg-components-panel-on-panel-item-bg-hover',
+                        )}
+                        onClick={() => {
+                          if (!isCurrentUser) {
+                            jumpToUserCursor(user.user_id)
+                            setDropdownOpen(false)
+                          }
+                        }}
+                      >
+                        <div className="relative">
+                          <Avatar
+                            name={user.username || 'User'}
+                            avatar={getAvatarUrl(user)}
+                            size={24}
+                            backgroundColor={userColor}
+                          />
+                        </div>
+                        {renderDisplayName(
+                          user,
+                          'system-xs-medium text-text-secondary',
+                          'text-text-tertiary',
+                        )}
+                      </div>
+                    )
+                  })}
+                </div>
+              </PortalToFollowElemContent>
+            </PortalToFollowElem>
+          )}
+        </div>
+      </div>
+    </div>
+  )
+}
+
+export default OnlineUsers

web/app/components/workflow/header/undo-redo.tsx

@@ -6,27 +6,39 @@ import {
   RiArrowGoForwardFill,
 } from '@remixicon/react'
 import TipPopup from '../operator/tip-popup'
-import { useWorkflowHistoryStore } from '../workflow-history-store'
 import Divider from '../../base/divider'
 import { useNodesReadOnly } from '@/app/components/workflow/hooks'
 import ViewWorkflowHistory from '@/app/components/workflow/header/view-workflow-history'
+import { collaborationManager } from '@/app/components/workflow/collaboration/core/collaboration-manager'
 import classNames from '@/utils/classnames'
 
 export type UndoRedoProps = { handleUndo: () => void; handleRedo: () => void }
 const UndoRedo: FC<UndoRedoProps> = ({ handleUndo, handleRedo }) => {
   const { t } = useTranslation()
-  const { store } = useWorkflowHistoryStore()
   const [buttonsDisabled, setButtonsDisabled] = useState({ undo: true, redo: true })
 
   useEffect(() => {
-    const unsubscribe = store.temporal.subscribe((state) => {
+    // Update button states based on Loro's UndoManager
+    const updateButtonStates = () => {
       setButtonsDisabled({
-        undo: state.pastStates.length === 0,
-        redo: state.futureStates.length === 0,
+        undo: !collaborationManager.canUndo(),
+        redo: !collaborationManager.canRedo(),
+      })
+    }
+
+    // Initial state
+    updateButtonStates()
+
+    // Listen for undo/redo state changes
+    const unsubscribe = collaborationManager.onUndoRedoStateChange((state) => {
+      setButtonsDisabled({
+        undo: !state.canUndo,
+        redo: !state.canRedo,
       })
     })
+
     return () => unsubscribe()
-  }, [store])
+  }, [])
 
   const { nodesReadOnly } = useNodesReadOnly()
 

web/app/components/workflow/hooks-store/store.ts

@@ -32,8 +32,9 @@ export type CommonHooksFnMap = {
     callback?: {
       onSuccess?: () => void
       onError?: () => void
-      onSettled?: () => void,
+      onSettled?: () => void
     },
+    forceUpload?: boolean,
   ) => Promise<void>
   syncWorkflowDraftWhenPageClose: () => void
   handleRefreshWorkflowDraft: () => void

web/app/components/workflow/hooks/index.ts

@@ -24,3 +24,4 @@ export * from './use-set-workflow-vars-with-value'
 export * from './use-workflow-search'
 export * from './use-auto-generate-webhook-url'
 export * from './use-serial-async-callback'
+export * from './use-workflow-comment'

web/app/components/workflow/hooks/use-checklist.ts

@@ -157,6 +157,9 @@ export const useChecklist = (nodes: Node[], edges: Edge[]) => {
         const checkData = getCheckData(node.data)
         const validator = nodesExtraData?.[node.data.type as BlockEnum]?.checkValid
         let errorMessage = validator ? validator(checkData, t, moreDataForCheckValid).errorMessage : undefined
+        // temp fix nodeMetaData is undefined
+        // const nodeMetaData = nodesExtraData?.[node.data.type]
+        // let { errorMessage } = nodeMetaData?.checkValid ? nodeMetaData.checkValid(checkData, t, moreDataForCheckValid) : { errorMessage: undefined }
 
         if (!errorMessage) {
           const availableVars = map[node.id].availableVars

web/app/components/workflow/hooks/use-collaborative-workflow.ts

@@ -0,0 +1,84 @@
+import { useCallback } from 'react'
+import { useStoreApi } from 'reactflow'
+import type { Edge, Node } from '../types'
+import { collaborationManager } from '../collaboration/core/collaboration-manager'
+
+const sanitizeNodeForBroadcast = (node: Node): Node => {
+  if (!node.data)
+    return node
+
+  if (!Object.prototype.hasOwnProperty.call(node.data, 'selected'))
+    return node
+
+  const sanitizedData = { ...node.data }
+  delete (sanitizedData as Record<string, unknown>).selected
+
+  return {
+    ...node,
+    data: sanitizedData,
+  }
+}
+
+const sanitizeEdgeForBroadcast = (edge: Edge): Edge => {
+  if (!edge.data)
+    return edge
+
+  if (!Object.prototype.hasOwnProperty.call(edge.data, '_connectedNodeIsSelected'))
+    return edge
+
+  const sanitizedData = { ...edge.data }
+  delete (sanitizedData as Record<string, unknown>)._connectedNodeIsSelected
+
+  return {
+    ...edge,
+    data: sanitizedData,
+  }
+}
+
+export const useCollaborativeWorkflow = () => {
+  const store = useStoreApi()
+  const { setNodes: collabSetNodes, setEdges: collabSetEdges } = collaborationManager
+
+  const setNodes = useCallback((newNodes: Node[], shouldBroadcast: boolean = true) => {
+    const { getNodes, setNodes: reactFlowSetNodes } = store.getState()
+    if (shouldBroadcast) {
+      const oldNodes = getNodes()
+      collabSetNodes(
+        oldNodes.map(sanitizeNodeForBroadcast),
+        newNodes.map(sanitizeNodeForBroadcast),
+      )
+    }
+    reactFlowSetNodes(newNodes)
+  }, [store, collabSetNodes])
+
+  const setEdges = useCallback((newEdges: Edge[], shouldBroadcast: boolean = true) => {
+    const { edges, setEdges: reactFlowSetEdges } = store.getState()
+    if (shouldBroadcast) {
+      collabSetEdges(
+        edges.map(sanitizeEdgeForBroadcast),
+        newEdges.map(sanitizeEdgeForBroadcast),
+      )
+    }
+
+    reactFlowSetEdges(newEdges)
+  }, [store, collabSetEdges])
+
+  const collaborativeStore = useCallback(() => {
+    const state = store.getState()
+    return {
+
+      nodes: state.getNodes(),
+      edges: state.edges,
+
+      setNodes,
+      setEdges,
+
+    }
+  }, [store, setNodes, setEdges])
+
+  return {
+    getState: collaborativeStore,
+    setNodes,
+    setEdges,
+  }
+}

web/app/components/workflow/hooks/use-edges-interactions.ts

@@ -4,9 +4,7 @@ import type {
   EdgeMouseHandler,
   OnEdgesChange,
 } from 'reactflow'
-import {
-  useStoreApi,
-} from 'reactflow'
+
 import type {
   Node,
 } from '../types'
@@ -14,61 +12,55 @@ import { getNodesConnectedSourceOrTargetHandleIdsMap } from '../utils'
 import { useNodesSyncDraft } from './use-nodes-sync-draft'
 import { useNodesReadOnly } from './use-workflow'
 import { WorkflowHistoryEvent, useWorkflowHistory } from './use-workflow-history'
+import { useCollaborativeWorkflow } from './use-collaborative-workflow'
 
 export const useEdgesInteractions = () => {
-  const store = useStoreApi()
   const { handleSyncWorkflowDraft } = useNodesSyncDraft()
   const { getNodesReadOnly } = useNodesReadOnly()
   const { saveStateToHistory } = useWorkflowHistory()
+  const collaborativeWorkflow = useCollaborativeWorkflow()
 
   const handleEdgeEnter = useCallback<EdgeMouseHandler>((_, edge) => {
     if (getNodesReadOnly())
       return
 
-    const {
-      edges,
-      setEdges,
-    } = store.getState()
+    const { edges, setEdges } = collaborativeWorkflow.getState()
     const newEdges = produce(edges, (draft) => {
       const currentEdge = draft.find(e => e.id === edge.id)!
 
       currentEdge.data._hovering = true
     })
-    setEdges(newEdges)
-  }, [store, getNodesReadOnly])
+    setEdges(newEdges, false)
+  }, [collaborativeWorkflow, getNodesReadOnly])
 
   const handleEdgeLeave = useCallback<EdgeMouseHandler>((_, edge) => {
     if (getNodesReadOnly())
       return
 
-    const {
-      edges,
-      setEdges,
-    } = store.getState()
+    const { edges, setEdges } = collaborativeWorkflow.getState()
     const newEdges = produce(edges, (draft) => {
       const currentEdge = draft.find(e => e.id === edge.id)!
 
       currentEdge.data._hovering = false
     })
-    setEdges(newEdges)
-  }, [store, getNodesReadOnly])
+    setEdges(newEdges, false)
+  }, [collaborativeWorkflow, getNodesReadOnly])
 
   const handleEdgeDeleteByDeleteBranch = useCallback((nodeId: string, branchId: string) => {
     if (getNodesReadOnly())
       return
 
     const {
-      getNodes,
+      nodes,
       setNodes,
       edges,
       setEdges,
-    } = store.getState()
+    } = collaborativeWorkflow.getState()
     const edgeWillBeDeleted = edges.filter(edge => edge.source === nodeId && edge.sourceHandle === branchId)
 
     if (!edgeWillBeDeleted.length)
       return
 
-    const nodes = getNodes()
     const nodesConnectedSourceOrTargetHandleIdsMap = getNodesConnectedSourceOrTargetHandleIdsMap(
       edgeWillBeDeleted.map(edge => ({ type: 'remove', edge })),
       nodes,
@@ -90,24 +82,23 @@ export const useEdgesInteractions = () => {
     setEdges(newEdges)
     handleSyncWorkflowDraft()
     saveStateToHistory(WorkflowHistoryEvent.EdgeDeleteByDeleteBranch)
-  }, [getNodesReadOnly, store, handleSyncWorkflowDraft, saveStateToHistory])
+  }, [getNodesReadOnly, collaborativeWorkflow, handleSyncWorkflowDraft, saveStateToHistory])
 
   const handleEdgeDelete = useCallback(() => {
     if (getNodesReadOnly())
       return
 
     const {
-      getNodes,
+      nodes,
       setNodes,
       edges,
       setEdges,
-    } = store.getState()
+    } = collaborativeWorkflow.getState()
     const currentEdgeIndex = edges.findIndex(edge => edge.selected)
 
     if (currentEdgeIndex < 0)
       return
     const currentEdge = edges[currentEdgeIndex]
-    const nodes = getNodes()
     const nodesConnectedSourceOrTargetHandleIdsMap = getNodesConnectedSourceOrTargetHandleIdsMap(
       [
         { type: 'remove', edge: currentEdge },
@@ -131,7 +122,7 @@ export const useEdgesInteractions = () => {
     setEdges(newEdges)
     handleSyncWorkflowDraft()
     saveStateToHistory(WorkflowHistoryEvent.EdgeDelete)
-  }, [getNodesReadOnly, store, handleSyncWorkflowDraft, saveStateToHistory])
+  }, [getNodesReadOnly, collaborativeWorkflow, handleSyncWorkflowDraft, saveStateToHistory])
 
   const handleEdgesChange = useCallback<OnEdgesChange>((changes) => {
     if (getNodesReadOnly())
@@ -140,7 +131,7 @@ export const useEdgesInteractions = () => {
     const {
       edges,
       setEdges,
-    } = store.getState()
+    } = collaborativeWorkflow.getState()
 
     const newEdges = produce(edges, (draft) => {
       changes.forEach((change) => {
@@ -149,7 +140,7 @@ export const useEdgesInteractions = () => {
       })
     })
     setEdges(newEdges)
-  }, [store, getNodesReadOnly])
+  }, [collaborativeWorkflow, getNodesReadOnly])
 
   return {
     handleEdgeEnter,

web/app/components/workflow/hooks/use-node-data-update.ts

@@ -4,6 +4,7 @@ import { useStoreApi } from 'reactflow'
 import type { SyncCallback } from './use-nodes-sync-draft'
 import { useNodesSyncDraft } from './use-nodes-sync-draft'
 import { useNodesReadOnly } from './use-workflow'
+import { useCollaborativeWorkflow } from './use-collaborative-workflow'
 
 type NodeDataUpdatePayload = {
   id: string
@@ -14,13 +15,11 @@ export const useNodeDataUpdate = () => {
   const store = useStoreApi()
   const { handleSyncWorkflowDraft } = useNodesSyncDraft()
   const { getNodesReadOnly } = useNodesReadOnly()
+  const collaborativeWorkflow = useCollaborativeWorkflow()
 
   const handleNodeDataUpdate = useCallback(({ id, data }: NodeDataUpdatePayload) => {
-    const {
-      getNodes,
-      setNodes,
-    } = store.getState()
-    const newNodes = produce(getNodes(), (draft) => {
+    const { nodes, setNodes } = collaborativeWorkflow.getState()
+    const newNodes = produce(nodes, (draft) => {
       const currentNode = draft.find(node => node.id === id)!
 
       if (currentNode)

web/app/components/workflow/hooks/use-nodes-interactions.ts

@@ -14,11 +14,10 @@ import {
   getConnectedEdges,
   getOutgoers,
   useReactFlow,
-  useStoreApi,
 } from 'reactflow'
 import type { PluginDefaultValue } from '../block-selector/types'
 import type { Edge, Node, OnNodeAdd } from '../types'
-import { BlockEnum, isTriggerNode } from '../types'
+import { BlockEnum, ControlMode, isTriggerNode } from '../types'
 import { useWorkflowStore } from '../store'
 import {
   CUSTOM_EDGE,
@@ -46,7 +45,7 @@ import { CUSTOM_LOOP_START_NODE } from '../nodes/loop-start/constants'
 import type { VariableAssignerNodeType } from '../nodes/variable-assigner/types'
 import { useNodeIterationInteractions } from '../nodes/iteration/use-interactions'
 import { useNodeLoopInteractions } from '../nodes/loop/use-interactions'
-import { useWorkflowHistoryStore } from '../workflow-history-store'
+import { collaborationManager } from '../collaboration/core/collaboration-manager'
 import { useNodesSyncDraft } from './use-nodes-sync-draft'
 import { useHelpline } from './use-helpline'
 import {
@@ -62,6 +61,7 @@ import { useNodesMetaData } from './use-nodes-meta-data'
 import type { RAGPipelineVariables } from '@/models/pipeline'
 import useInspectVarsCrud from './use-inspect-vars-crud'
 import { getNodeUsedVars } from '../nodes/_base/components/variable/utils'
+import { useCollaborativeWorkflow } from './use-collaborative-workflow'
 
 // Entry node deletion restriction has been removed to allow empty workflows
 
@@ -74,10 +74,9 @@ const ENTRY_NODE_WRAPPER_OFFSET = {
 
 export const useNodesInteractions = () => {
   const { t } = useTranslation()
-  const store = useStoreApi()
+  const collaborativeWorkflow = useCollaborativeWorkflow()
   const workflowStore = useWorkflowStore()
   const reactflow = useReactFlow()
-  const { store: workflowHistoryStore } = useWorkflowHistoryStore()
   const { handleSyncWorkflowDraft } = useNodesSyncDraft()
   const { getAfterNodesInSameBranch } = useWorkflow()
   const { getNodesReadOnly } = useNodesReadOnly()
@@ -93,7 +92,7 @@ export const useNodesInteractions = () => {
   })
   const { nodesMap: nodesMetaDataMap } = useNodesMetaData()
 
-  const { saveStateToHistory, undo, redo } = useWorkflowHistory()
+  const { saveStateToHistory } = useWorkflowHistory()
 
   const handleNodeDragStart = useCallback<NodeDragHandler>(
     (_, node) => {
@@ -129,10 +128,9 @@ export const useNodesInteractions = () => {
 
       if (node.type === CUSTOM_LOOP_START_NODE) return
 
-      const { getNodes, setNodes } = store.getState()
       e.stopPropagation()
 
-      const nodes = getNodes()
+      const { nodes, setNodes } = collaborativeWorkflow.getState()
 
       const { restrictPosition } = handleNodeIterationChildDrag(node)
       const { restrictPosition: restrictLoopPosition }
@@ -194,15 +192,7 @@ export const useNodesInteractions = () => {
         }
       })
       setNodes(newNodes)
-    },
-    [
-      getNodesReadOnly,
-      store,
-      handleNodeIterationChildDrag,
-      handleNodeLoopChildDrag,
-      handleSetHelpline,
-    ],
-  )
+    }, [getNodesReadOnly, collaborativeWorkflow, handleNodeIterationChildDrag, handleNodeLoopChildDrag, handleSetHelpline])
 
   const handleNodeDragStop = useCallback<NodeDragHandler>(
     (_, node) => {
@@ -249,11 +239,11 @@ export const useNodesInteractions = () => {
       )
         return
 
-      const { getNodes, setNodes, edges, setEdges } = store.getState()
-      const nodes = getNodes()
-      const { connectingNodePayload, setEnteringNodePayload }
-        = workflowStore.getState()
-
+      const { nodes, edges, setNodes, setEdges } = collaborativeWorkflow.getState()
+      const {
+        connectingNodePayload,
+        setEnteringNodePayload,
+      } = workflowStore.getState()
       if (connectingNodePayload) {
         if (connectingNodePayload.nodeId === node.id) return
         const connectingNode: Node = nodes.find(
@@ -272,25 +262,25 @@ export const useNodesInteractions = () => {
             draft.forEach((n) => {
               if (
                 n.id === node.id
-                && fromType === 'source'
-                && (node.data.type === BlockEnum.VariableAssigner
-                  || node.data.type === BlockEnum.VariableAggregator)
+              && fromType === 'source'
+              && (node.data.type === BlockEnum.VariableAssigner
+                || node.data.type === BlockEnum.VariableAggregator)
               ) {
                 if (!node.data.advanced_settings?.group_enabled)
                   n.data._isEntering = true
               }
               if (
                 n.id === node.id
-                && fromType === 'target'
-                && (connectingNode.data.type === BlockEnum.VariableAssigner
-                  || connectingNode.data.type === BlockEnum.VariableAggregator)
-                && node.data.type !== BlockEnum.IfElse
-                && node.data.type !== BlockEnum.QuestionClassifier
+              && fromType === 'target'
+              && (connectingNode.data.type === BlockEnum.VariableAssigner
+                || connectingNode.data.type === BlockEnum.VariableAggregator)
+              && node.data.type !== BlockEnum.IfElse
+              && node.data.type !== BlockEnum.QuestionClassifier
               )
                 n.data._isEntering = true
             })
           })
-          setNodes(newNodes)
+          setNodes(newNodes, false)
         }
       }
       const newEdges = produce(edges, (draft) => {
@@ -301,9 +291,9 @@ export const useNodesInteractions = () => {
           if (currentEdge) currentEdge.data._connectedNodeIsHovering = true
         })
       })
-      setEdges(newEdges)
+      setEdges(newEdges, false)
     },
-    [store, workflowStore, getNodesReadOnly],
+    [collaborativeWorkflow, workflowStore, getNodesReadOnly],
   )
 
   const handleNodeLeave = useCallback<NodeMouseHandler>(
@@ -324,21 +314,21 @@ export const useNodesInteractions = () => {
 
       const { setEnteringNodePayload } = workflowStore.getState()
       setEnteringNodePayload(undefined)
-      const { getNodes, setNodes, edges, setEdges } = store.getState()
-      const newNodes = produce(getNodes(), (draft) => {
+      const { nodes, setNodes, edges, setEdges } = collaborativeWorkflow.getState()
+      const newNodes = produce(nodes, (draft) => {
         draft.forEach((node) => {
           node.data._isEntering = false
         })
       })
-      setNodes(newNodes)
+      setNodes(newNodes, false)
       const newEdges = produce(edges, (draft) => {
         draft.forEach((edge) => {
           edge.data._connectedNodeIsHovering = false
         })
       })
-      setEdges(newEdges)
+      setEdges(newEdges, false)
     },
-    [store, workflowStore, getNodesReadOnly],
+    [collaborativeWorkflow, workflowStore, getNodesReadOnly],
   )
 
   const handleNodeSelect = useCallback(
@@ -349,9 +339,7 @@ export const useNodesInteractions = () => {
     ) => {
       if (initShowLastRunTab)
         workflowStore.setState({ initShowLastRunTab: true })
-      const { getNodes, setNodes, edges, setEdges } = store.getState()
-
-      const nodes = getNodes()
+      const { nodes, setNodes, edges, setEdges } = collaborativeWorkflow.getState()
       const selectedNode = nodes.find(node => node.data.selected)
 
       if (!cancelSelection && selectedNode?.id === nodeId) return
@@ -362,7 +350,7 @@ export const useNodesInteractions = () => {
           else node.data.selected = false
         })
       })
-      setNodes(newNodes)
+      setNodes(newNodes, false)
 
       const connectedEdges = getConnectedEdges(
         [{ id: nodeId } as Node],
@@ -384,22 +372,20 @@ export const useNodesInteractions = () => {
           }
         })
       })
-      setEdges(newEdges)
-
-      handleSyncWorkflowDraft()
-    },
-    [store, handleSyncWorkflowDraft],
-  )
+      setEdges(newEdges, false)
+    }, [collaborativeWorkflow])
 
   const handleNodeClick = useCallback<NodeMouseHandler>(
     (_, node) => {
+      const { controlMode } = workflowStore.getState()
+      if (controlMode === ControlMode.Comment) return
       if (node.type === CUSTOM_ITERATION_START_NODE) return
       if (node.type === CUSTOM_LOOP_START_NODE) return
       if (node.data.type === BlockEnum.DataSourceEmpty) return
       if (node.data._pluginInstallLocked) return
       handleNodeSelect(node.id)
     },
-    [handleNodeSelect],
+    [handleNodeSelect, workflowStore],
   )
 
   const handleNodeConnect = useCallback<OnConnect>(
@@ -407,8 +393,7 @@ export const useNodesInteractions = () => {
       if (source === target) return
       if (getNodesReadOnly()) return
 
-      const { getNodes, setNodes, edges, setEdges } = store.getState()
-      const nodes = getNodes()
+      const { nodes, edges, setNodes, setEdges } = collaborativeWorkflow.getState()
       const targetNode = nodes.find(node => node.id === target!)
       const sourceNode = nodes.find(node => node.id === source!)
 
@@ -486,7 +471,7 @@ export const useNodesInteractions = () => {
     },
     [
       getNodesReadOnly,
-      store,
+      collaborativeWorkflow,
       workflowStore,
       handleSyncWorkflowDraft,
       saveStateToHistory,
@@ -499,8 +484,8 @@ export const useNodesInteractions = () => {
 
       if (nodeId && handleType) {
         const { setConnectingNodePayload } = workflowStore.getState()
-        const { getNodes } = store.getState()
-        const node = getNodes().find(n => n.id === nodeId)!
+        const { nodes } = collaborativeWorkflow.getState()
+        const node = nodes.find(n => n.id === nodeId)!
 
         if (node.type === CUSTOM_NOTE_NODE) return
 
@@ -517,9 +502,7 @@ export const useNodesInteractions = () => {
           handleId,
         })
       }
-    },
-    [store, workflowStore, getNodesReadOnly],
-  )
+    }, [collaborativeWorkflow, workflowStore, getNodesReadOnly])
 
   const handleNodeConnectEnd = useCallback<OnConnectEnd>(
     (e: any) => {
@@ -535,8 +518,7 @@ export const useNodesInteractions = () => {
         const { setShowAssignVariablePopup, hoveringAssignVariableGroupId }
           = workflowStore.getState()
         const { screenToFlowPosition } = reactflow
-        const { getNodes, setNodes } = store.getState()
-        const nodes = getNodes()
+        const { nodes, setNodes } = collaborativeWorkflow.getState()
         const fromHandleType = connectingNodePayload.handleType
         const fromHandleId = connectingNodePayload.handleId
         const fromNode = nodes.find(
@@ -593,7 +575,7 @@ export const useNodesInteractions = () => {
       setConnectingNodePayload(undefined)
       setEnteringNodePayload(undefined)
     },
-    [store, handleNodeConnect, getNodesReadOnly, workflowStore, reactflow],
+    [collaborativeWorkflow, handleNodeConnect, getNodesReadOnly, workflowStore, reactflow],
   )
 
   const { deleteNodeInspectorVars } = useInspectVarsCrud()
@@ -602,9 +584,7 @@ export const useNodesInteractions = () => {
     (nodeId: string) => {
       if (getNodesReadOnly()) return
 
-      const { getNodes, setNodes, edges, setEdges } = store.getState()
-
-      const nodes = getNodes()
+      const { nodes, setNodes, edges, setEdges } = collaborativeWorkflow.getState()
       const currentNodeIndex = nodes.findIndex(node => node.id === nodeId)
       const currentNode = nodes[currentNodeIndex]
 
@@ -759,7 +739,7 @@ export const useNodesInteractions = () => {
     },
     [
       getNodesReadOnly,
-      store,
+      collaborativeWorkflow,
       handleSyncWorkflowDraft,
       saveStateToHistory,
       workflowStore,
@@ -781,8 +761,7 @@ export const useNodesInteractions = () => {
     ) => {
       if (getNodesReadOnly()) return
 
-      const { getNodes, setNodes, edges, setEdges } = store.getState()
-      const nodes = getNodes()
+      const { nodes, setNodes, edges, setEdges } = collaborativeWorkflow.getState()
       const nodesWithSameType = nodes.filter(
         node => node.data.type === nodeType,
       )
@@ -1312,7 +1291,7 @@ export const useNodesInteractions = () => {
     },
     [
       getNodesReadOnly,
-      store,
+      collaborativeWorkflow,
       handleSyncWorkflowDraft,
       saveStateToHistory,
       workflowStore,
@@ -1330,8 +1309,7 @@ export const useNodesInteractions = () => {
     ) => {
       if (getNodesReadOnly()) return
 
-      const { getNodes, setNodes, edges, setEdges } = store.getState()
-      const nodes = getNodes()
+      const { nodes, setNodes, edges, setEdges } = collaborativeWorkflow.getState()
       const currentNode = nodes.find(node => node.id === currentNodeId)!
       const connectedEdges = getConnectedEdges([currentNode], edges)
       const nodesWithSameType = nodes.filter(
@@ -1409,7 +1387,7 @@ export const useNodesInteractions = () => {
     },
     [
       getNodesReadOnly,
-      store,
+      collaborativeWorkflow,
       handleSyncWorkflowDraft,
       saveStateToHistory,
       nodesMetaDataMap,
@@ -1417,16 +1395,14 @@ export const useNodesInteractions = () => {
   )
 
   const handleNodesCancelSelected = useCallback(() => {
-    const { getNodes, setNodes } = store.getState()
-
-    const nodes = getNodes()
+    const { nodes, setNodes } = collaborativeWorkflow.getState()
     const newNodes = produce(nodes, (draft) => {
       draft.forEach((node) => {
         node.data.selected = false
       })
     })
     setNodes(newNodes)
-  }, [store])
+  }, [collaborativeWorkflow])
 
   const handleNodeContextMenu = useCallback(
     (e: MouseEvent, node: Node) => {
@@ -1463,9 +1439,7 @@ export const useNodesInteractions = () => {
 
       const { setClipboardElements } = workflowStore.getState()
 
-      const { getNodes } = store.getState()
-
-      const nodes = getNodes()
+      const { nodes } = collaborativeWorkflow.getState()
 
       if (nodeId) {
         // If nodeId is provided, copy that specific node
@@ -1506,7 +1480,7 @@ export const useNodesInteractions = () => {
         if (selectedNode) setClipboardElements([selectedNode])
       }
     },
-    [getNodesReadOnly, store, workflowStore],
+    [getNodesReadOnly, collaborativeWorkflow, workflowStore],
   )
 
   const handleNodesPaste = useCallback(() => {
@@ -1514,11 +1488,10 @@ export const useNodesInteractions = () => {
 
     const { clipboardElements, mousePosition } = workflowStore.getState()
 
-    const { getNodes, setNodes, edges, setEdges } = store.getState()
+    const { nodes, setNodes, edges, setEdges } = collaborativeWorkflow.getState()
 
     const nodesToPaste: Node[] = []
     const edgesToPaste: Edge[] = []
-    const nodes = getNodes()
 
     if (clipboardElements.length) {
       const { x, y } = getTopLeftNodePosition(clipboardElements)
@@ -1670,7 +1643,7 @@ export const useNodesInteractions = () => {
   }, [
     getNodesReadOnly,
     workflowStore,
-    store,
+    collaborativeWorkflow,
     reactflow,
     saveStateToHistory,
     handleSyncWorkflowDraft,
@@ -1692,9 +1665,8 @@ export const useNodesInteractions = () => {
   const handleNodesDelete = useCallback(() => {
     if (getNodesReadOnly()) return
 
-    const { getNodes, edges } = store.getState()
+    const { nodes, edges } = collaborativeWorkflow.getState()
 
-    const nodes = getNodes()
     const bundledNodes = nodes.filter(
       node => node.data._isBundled,
     )
@@ -1713,16 +1685,15 @@ export const useNodesInteractions = () => {
     )
 
     if (selectedNode) handleNodeDelete(selectedNode.id)
-  }, [store, getNodesReadOnly, handleNodeDelete])
+  }, [collaborativeWorkflow, getNodesReadOnly, handleNodeDelete])
 
   const handleNodeResize = useCallback(
     (nodeId: string, params: ResizeParamsWithDirection) => {
       if (getNodesReadOnly()) return
 
-      const { getNodes, setNodes } = store.getState()
+      const { nodes, setNodes } = collaborativeWorkflow.getState()
       const { x, y, width, height } = params
 
-      const nodes = getNodes()
       const currentNode = nodes.find(n => n.id === nodeId)!
       const childrenNodes = nodes.filter(n =>
         currentNode.data._children?.find((c: any) => c.nodeId === n.id),
@@ -1781,15 +1752,14 @@ export const useNodesInteractions = () => {
       handleSyncWorkflowDraft()
       saveStateToHistory(WorkflowHistoryEvent.NodeResize, { nodeId })
     },
-    [getNodesReadOnly, store, handleSyncWorkflowDraft, saveStateToHistory],
+    [getNodesReadOnly, collaborativeWorkflow, handleSyncWorkflowDraft, saveStateToHistory],
   )
 
   const handleNodeDisconnect = useCallback(
     (nodeId: string) => {
       if (getNodesReadOnly()) return
 
-      const { getNodes, setNodes, edges, setEdges } = store.getState()
-      const nodes = getNodes()
+      const { nodes, setNodes, edges, setEdges } = collaborativeWorkflow.getState()
       const currentNode = nodes.find(node => node.id === nodeId)!
       const connectedEdges = getConnectedEdges([currentNode], edges)
       const nodesConnectedSourceOrTargetHandleIdsMap
@@ -1820,24 +1790,24 @@ export const useNodesInteractions = () => {
       handleSyncWorkflowDraft()
       saveStateToHistory(WorkflowHistoryEvent.EdgeDelete)
     },
-    [store, getNodesReadOnly, handleSyncWorkflowDraft, saveStateToHistory],
+    [collaborativeWorkflow, getNodesReadOnly, handleSyncWorkflowDraft, saveStateToHistory],
   )
 
   const handleHistoryBack = useCallback(() => {
     if (getNodesReadOnly() || getWorkflowReadOnly()) return
 
-    const { setEdges, setNodes } = store.getState()
-    undo()
+    // Use collaborative undo from Loro
+    const undoResult = collaborationManager.undo()
 
-    const { edges, nodes } = workflowHistoryStore.getState()
-    if (edges.length === 0 && nodes.length === 0) return
-
-    setEdges(edges)
-    setNodes(nodes)
+    if (undoResult) {
+      // The undo operation will automatically trigger subscriptions
+      // which will update the nodes and edges through setupSubscriptions
+      console.log('Collaborative undo performed')
+    }
+    else {
+      console.log('Nothing to undo')
+    }
   }, [
-    store,
-    undo,
-    workflowHistoryStore,
     getNodesReadOnly,
     getWorkflowReadOnly,
   ])
@@ -1845,18 +1815,18 @@ export const useNodesInteractions = () => {
   const handleHistoryForward = useCallback(() => {
     if (getNodesReadOnly() || getWorkflowReadOnly()) return
 
-    const { setEdges, setNodes } = store.getState()
-    redo()
+    // Use collaborative redo from Loro
+    const redoResult = collaborationManager.redo()
 
-    const { edges, nodes } = workflowHistoryStore.getState()
-    if (edges.length === 0 && nodes.length === 0) return
-
-    setEdges(edges)
-    setNodes(nodes)
+    if (redoResult) {
+      // The redo operation will automatically trigger subscriptions
+      // which will update the nodes and edges through setupSubscriptions
+      console.log('Collaborative redo performed')
+    }
+    else {
+      console.log('Nothing to redo')
+    }
   }, [
-    redo,
-    store,
-    workflowHistoryStore,
     getNodesReadOnly,
     getWorkflowReadOnly,
   ])
@@ -1865,8 +1835,7 @@ export const useNodesInteractions = () => {
   /** Add opacity-30 to all nodes except the nodeId */
   const dimOtherNodes = useCallback(() => {
     if (isDimming) return
-    const { getNodes, setNodes, edges, setEdges } = store.getState()
-    const nodes = getNodes()
+    const { nodes, setNodes, edges, setEdges } = collaborativeWorkflow.getState()
 
     const selectedNode = nodes.find(n => n.data.selected)
     if (!selectedNode) return
@@ -1959,12 +1928,11 @@ export const useNodesInteractions = () => {
       draft.push(...tempEdges)
     })
     setEdges(newEdges)
-  }, [isDimming, store])
+  }, [isDimming, collaborativeWorkflow])
 
   /** Restore all nodes to full opacity */
   const undimAllNodes = useCallback(() => {
-    const { getNodes, setNodes, edges, setEdges } = store.getState()
-    const nodes = getNodes()
+    const { nodes, setNodes, edges, setEdges } = collaborativeWorkflow.getState()
     setIsDimming(false)
 
     const newNodes = produce(nodes, (draft) => {
@@ -1984,7 +1952,7 @@ export const useNodesInteractions = () => {
       },
     )
     setEdges(newEdges)
-  }, [store])
+  }, [collaborativeWorkflow])
 
   return {
     handleNodeDragStart,

web/app/components/workflow/hooks/use-nodes-sync-draft.ts

@@ -18,13 +18,18 @@ export const useNodesSyncDraft = () => {
   const handleSyncWorkflowDraft = useCallback((
     sync?: boolean,
     notRefreshWhenSyncError?: boolean,
-    callback?: SyncCallback,
+    callback?: {
+      onSuccess?: () => void
+      onError?: () => void
+      onSettled?: () => void
+    },
+    forceUpload?: boolean,
   ) => {
     if (getNodesReadOnly())
       return
 
     if (sync)
-      doSyncWorkflowDraft(notRefreshWhenSyncError, callback)
+      doSyncWorkflowDraft(notRefreshWhenSyncError, callback, forceUpload)
     else
       debouncedSyncWorkflowDraft(doSyncWorkflowDraft)
   }, [debouncedSyncWorkflowDraft, doSyncWorkflowDraft, getNodesReadOnly])

web/app/components/workflow/hooks/use-shortcuts.ts

@@ -34,6 +34,8 @@ export const useShortcuts = (): void => {
   const {
     handleModeHand,
     handleModePointer,
+    handleModeComment,
+    isCommentModeAvailable,
   } = useWorkflowMoveMode()
   const { handleLayout } = useWorkflowOrganize()
   const { handleToggleMaximizeCanvas } = useWorkflowCanvasMaximize()
@@ -145,6 +147,16 @@ export const useShortcuts = (): void => {
     useCapture: true,
   })
 
+  useKeyPress('c', (e) => {
+    if (shouldHandleShortcut(e) && isCommentModeAvailable) {
+      e.preventDefault()
+      handleModeComment()
+    }
+  }, {
+    exactMatch: true,
+    useCapture: true,
+  })
+
   useKeyPress(`${getKeyboardKeyCodeBySystem('ctrl')}.o`, (e) => {
     if (shouldHandleShortcut(e)) {
       e.preventDefault()

web/app/components/workflow/hooks/use-workflow-comment.ts

@@ -0,0 +1,516 @@
+import { useCallback, useEffect, useRef } from 'react'
+import { useParams } from 'next/navigation'
+import { useReactFlow } from 'reactflow'
+import { useStore } from '../store'
+import { ControlMode } from '../types'
+import type { WorkflowCommentDetail, WorkflowCommentList } from '@/service/workflow-comment'
+import { createWorkflowComment, createWorkflowCommentReply, deleteWorkflowComment, deleteWorkflowCommentReply, fetchWorkflowComment, fetchWorkflowComments, resolveWorkflowComment, updateWorkflowComment, updateWorkflowCommentReply } from '@/service/workflow-comment'
+import { collaborationManager } from '@/app/components/workflow/collaboration'
+import { useAppContext } from '@/context/app-context'
+import { useGlobalPublicStore } from '@/context/global-public-context'
+
+export const useWorkflowComment = () => {
+  const params = useParams()
+  const appId = params.appId as string
+  const reactflow = useReactFlow()
+  const controlMode = useStore(s => s.controlMode)
+  const pendingComment = useStore(s => s.pendingComment)
+  const setPendingComment = useStore(s => s.setPendingComment)
+  const setActiveCommentId = useStore(s => s.setActiveCommentId)
+  const activeCommentId = useStore(s => s.activeCommentId)
+  const comments = useStore(s => s.comments)
+  const setComments = useStore(s => s.setComments)
+  const loading = useStore(s => s.commentsLoading)
+  const setCommentsLoading = useStore(s => s.setCommentsLoading)
+  const activeComment = useStore(s => s.activeCommentDetail)
+  const setActiveComment = useStore(s => s.setActiveCommentDetail)
+  const activeCommentLoading = useStore(s => s.activeCommentDetailLoading)
+  const setActiveCommentLoading = useStore(s => s.setActiveCommentDetailLoading)
+  const replySubmitting = useStore(s => s.replySubmitting)
+  const setReplySubmitting = useStore(s => s.setReplySubmitting)
+  const replyUpdating = useStore(s => s.replyUpdating)
+  const setReplyUpdating = useStore(s => s.setReplyUpdating)
+  const commentDetailCache = useStore(s => s.commentDetailCache)
+  const setCommentDetailCache = useStore(s => s.setCommentDetailCache)
+  const rightPanelWidth = useStore(s => s.rightPanelWidth)
+  const nodePanelWidth = useStore(s => s.nodePanelWidth)
+  const mentionableUsers = useStore(state => (
+    appId ? state.mentionableUsersCache[appId] ?? [] : []
+  ))
+  const { userProfile } = useAppContext()
+  const isCollaborationEnabled = useGlobalPublicStore(s => s.systemFeatures.enable_collaboration_mode)
+  const commentDetailCacheRef = useRef<Record<string, WorkflowCommentDetail>>(commentDetailCache)
+  const activeCommentIdRef = useRef<string | null>(null)
+
+  useEffect(() => {
+    activeCommentIdRef.current = activeCommentId ?? null
+  }, [activeCommentId])
+
+  useEffect(() => {
+    commentDetailCacheRef.current = commentDetailCache
+  }, [commentDetailCache])
+
+  const refreshActiveComment = useCallback(async (commentId: string) => {
+    if (!appId) return
+
+    const detailResponse = await fetchWorkflowComment(appId, commentId)
+    const detail = (detailResponse as any)?.data ?? detailResponse
+
+    commentDetailCacheRef.current = {
+      ...commentDetailCacheRef.current,
+      [commentId]: detail,
+    }
+    setCommentDetailCache(commentDetailCacheRef.current)
+    setActiveComment(detail)
+  }, [appId, setActiveComment, setCommentDetailCache])
+
+  const loadComments = useCallback(async () => {
+    if (!appId || !isCollaborationEnabled) return
+
+    setCommentsLoading(true)
+    try {
+      const commentsData = await fetchWorkflowComments(appId)
+      setComments(commentsData)
+    }
+    catch (error) {
+      console.error('Failed to fetch comments:', error)
+    }
+    finally {
+      setCommentsLoading(false)
+    }
+  }, [appId, isCollaborationEnabled, setComments, setCommentsLoading])
+
+  // Setup collaboration
+  useEffect(() => {
+    if (!appId || !isCollaborationEnabled) return
+
+    const unsubscribe = collaborationManager.onCommentsUpdate(() => {
+      loadComments()
+      if (activeCommentIdRef.current)
+        refreshActiveComment(activeCommentIdRef.current)
+    })
+
+    return unsubscribe
+  }, [appId, isCollaborationEnabled, loadComments, refreshActiveComment])
+
+  useEffect(() => {
+    loadComments()
+  }, [loadComments])
+
+  const handleCommentSubmit = useCallback(async (content: string, mentionedUserIds: string[] = []) => {
+    if (!pendingComment) return
+
+    console.log('Submitting comment:', { appId, pendingComment, content, mentionedUserIds })
+
+    if (!appId) {
+      console.error('AppId is missing')
+      return
+    }
+
+    try {
+      // Convert screen position to flow position when submitting
+      const { screenToFlowPosition } = reactflow
+      const flowPosition = screenToFlowPosition({
+        x: pendingComment.pageX,
+        y: pendingComment.pageY,
+      })
+
+      const newComment = await createWorkflowComment(appId, {
+        position_x: flowPosition.x,
+        position_y: flowPosition.y,
+        content,
+        mentioned_user_ids: mentionedUserIds,
+      })
+
+      console.log('Comment created successfully:', newComment)
+
+      const createdAt = (newComment as any)?.created_at
+      const createdByAccount = {
+        id: userProfile?.id ?? '',
+        name: userProfile?.name ?? '',
+        email: userProfile?.email ?? '',
+        avatar_url: userProfile?.avatar_url || userProfile?.avatar || undefined,
+      }
+      const mentionedUsers = mentionedUserIds
+        .map(mentionedId => mentionableUsers.find(user => user.id === mentionedId))
+        .filter((user): user is NonNullable<typeof user> => Boolean(user))
+      const uniqueParticipantsMap = new Map<string, typeof createdByAccount>()
+      if (createdByAccount.id)
+        uniqueParticipantsMap.set(createdByAccount.id, createdByAccount)
+      for (const user of mentionedUsers) {
+        if (!uniqueParticipantsMap.has(user.id)) {
+          uniqueParticipantsMap.set(user.id, {
+            id: user.id,
+            name: user.name,
+            email: user.email,
+            avatar_url: user.avatar_url,
+          })
+        }
+      }
+      const participants = Array.from(uniqueParticipantsMap.values())
+
+      const composedComment: WorkflowCommentList = {
+        id: newComment.id,
+        position_x: flowPosition.x,
+        position_y: flowPosition.y,
+        content,
+        created_by: createdByAccount.id,
+        created_by_account: createdByAccount,
+        created_at: createdAt,
+        updated_at: createdAt,
+        resolved: false,
+        mention_count: mentionedUserIds.length,
+        reply_count: 0,
+        participants,
+      }
+
+      const composedDetail: WorkflowCommentDetail = {
+        id: newComment.id,
+        position_x: flowPosition.x,
+        position_y: flowPosition.y,
+        content,
+        created_by: createdByAccount.id,
+        created_by_account: createdByAccount,
+        created_at: createdAt,
+        updated_at: createdAt,
+        resolved: false,
+        replies: [],
+        mentions: mentionedUserIds.map(mentionedId => ({
+          mentioned_user_id: mentionedId,
+          mentioned_user_account: mentionableUsers.find(user => user.id === mentionedId) ?? null,
+          reply_id: null,
+        })),
+      }
+
+      setComments([...comments, composedComment])
+      commentDetailCacheRef.current = {
+        ...commentDetailCacheRef.current,
+        [newComment.id]: composedDetail,
+      }
+      setCommentDetailCache(commentDetailCacheRef.current)
+
+      collaborationManager.emitCommentsUpdate(appId)
+
+      setPendingComment(null)
+    }
+    catch (error) {
+      console.error('Failed to create comment:', error)
+      setPendingComment(null)
+    }
+  }, [appId, pendingComment, setPendingComment, reactflow, comments, setComments, userProfile, setCommentDetailCache, mentionableUsers])
+
+  const handleCommentCancel = useCallback(() => {
+    setPendingComment(null)
+  }, [setPendingComment])
+
+  useEffect(() => {
+    if (controlMode !== ControlMode.Comment)
+      setPendingComment(null)
+  }, [controlMode, setPendingComment])
+
+  const handleCommentIconClick = useCallback(async (comment: WorkflowCommentList) => {
+    setPendingComment(null)
+
+    activeCommentIdRef.current = comment.id
+    setActiveCommentId(comment.id)
+
+    const cachedDetail = commentDetailCacheRef.current[comment.id]
+    setActiveComment(cachedDetail || comment)
+
+    const hasSelectedNode = reactflow.getNodes().some(node => node.data?.selected)
+    const commentPanelWidth = controlMode === ControlMode.Comment ? 420 : 0
+    const fallbackPanelWidth = (hasSelectedNode ? nodePanelWidth : 0) + commentPanelWidth
+    const effectivePanelWidth = Math.max(rightPanelWidth ?? 0, fallbackPanelWidth)
+
+    const baseHorizontalOffsetPx = 220
+    const panelCompensationPx = effectivePanelWidth / 2
+    const desiredHorizontalOffsetPx = baseHorizontalOffsetPx + panelCompensationPx
+    const maxOffset = Math.max(0, (window.innerWidth / 2) - 60)
+    const horizontalOffsetPx = Math.min(desiredHorizontalOffsetPx, maxOffset)
+
+    reactflow.setCenter(
+      comment.position_x + horizontalOffsetPx,
+      comment.position_y,
+      { zoom: 1, duration: 600 },
+    )
+
+    if (!appId) return
+
+    setActiveCommentLoading(!cachedDetail)
+
+    try {
+      const detailResponse = await fetchWorkflowComment(appId, comment.id)
+      const detail = (detailResponse as any)?.data ?? detailResponse
+
+      commentDetailCacheRef.current = {
+        ...commentDetailCacheRef.current,
+        [comment.id]: detail,
+      }
+      setCommentDetailCache(commentDetailCacheRef.current)
+
+      if (activeCommentIdRef.current === comment.id)
+        setActiveComment(detail)
+    }
+    catch (e) {
+      console.warn('Failed to load workflow comment detail', e)
+    }
+    finally {
+      setActiveCommentLoading(false)
+    }
+  }, [
+    appId,
+    controlMode,
+    nodePanelWidth,
+    reactflow,
+    rightPanelWidth,
+    setActiveComment,
+    setActiveCommentId,
+    setActiveCommentLoading,
+    setCommentDetailCache,
+    setPendingComment,
+  ])
+
+  const handleCommentResolve = useCallback(async (commentId: string) => {
+    if (!appId) return
+
+    setActiveCommentLoading(true)
+    try {
+      await resolveWorkflowComment(appId, commentId)
+
+      collaborationManager.emitCommentsUpdate(appId)
+
+      await refreshActiveComment(commentId)
+      await loadComments()
+    }
+    catch (error) {
+      console.error('Failed to resolve comment:', error)
+    }
+    finally {
+      setActiveCommentLoading(false)
+    }
+  }, [appId, loadComments, refreshActiveComment, setActiveCommentLoading])
+
+  const handleCommentDelete = useCallback(async (commentId: string) => {
+    if (!appId) return
+
+    setActiveCommentLoading(true)
+    try {
+      await deleteWorkflowComment(appId, commentId)
+
+      collaborationManager.emitCommentsUpdate(appId)
+
+      const updatedCache = { ...commentDetailCacheRef.current }
+      delete updatedCache[commentId]
+      commentDetailCacheRef.current = updatedCache
+      setCommentDetailCache(updatedCache)
+
+      const currentComments = comments.filter(c => c.id !== commentId)
+      const commentIndex = comments.findIndex(c => c.id === commentId)
+      const fallbackTarget = commentIndex >= 0 ? comments[commentIndex + 1] ?? comments[commentIndex - 1] : undefined
+
+      await loadComments()
+
+      if (fallbackTarget) {
+        handleCommentIconClick(fallbackTarget)
+      }
+      else if (currentComments.length > 0) {
+        const nextComment = currentComments[0]
+        handleCommentIconClick(nextComment)
+      }
+      else {
+        setActiveComment(null)
+        setActiveCommentId(null)
+        activeCommentIdRef.current = null
+      }
+    }
+    catch (error) {
+      console.error('Failed to delete comment:', error)
+    }
+    finally {
+      setActiveCommentLoading(false)
+    }
+  }, [appId, comments, handleCommentIconClick, loadComments, setActiveComment, setActiveCommentId, setActiveCommentLoading, setCommentDetailCache])
+
+  const handleCommentPositionUpdate = useCallback(async (commentId: string, position: { x: number; y: number }) => {
+    if (!appId) return
+
+    const targetComment = comments.find(c => c.id === commentId)
+    if (!targetComment) return
+
+    const nextPosition = {
+      position_x: position.x,
+      position_y: position.y,
+    }
+
+    const previousComments = comments
+    const updatedComments = comments.map(c =>
+      c.id === commentId
+        ? { ...c, ...nextPosition }
+        : c,
+    )
+    setComments(updatedComments)
+
+    const cachedDetail = commentDetailCacheRef.current[commentId]
+    const updatedDetail = cachedDetail ? { ...cachedDetail, ...nextPosition } : null
+    if (updatedDetail) {
+      commentDetailCacheRef.current = {
+        ...commentDetailCacheRef.current,
+        [commentId]: updatedDetail,
+      }
+      setCommentDetailCache(commentDetailCacheRef.current)
+
+      if (activeCommentIdRef.current === commentId)
+        setActiveComment(updatedDetail)
+    }
+    else if (activeComment?.id === commentId) {
+      setActiveComment({ ...activeComment, ...nextPosition })
+    }
+
+    try {
+      await updateWorkflowComment(appId, commentId, {
+        content: targetComment.content,
+        position_x: nextPosition.position_x,
+        position_y: nextPosition.position_y,
+      })
+      collaborationManager.emitCommentsUpdate(appId)
+    }
+    catch (error) {
+      console.error('Failed to update comment position:', error)
+      setComments(previousComments)
+
+      if (cachedDetail) {
+        commentDetailCacheRef.current = {
+          ...commentDetailCacheRef.current,
+          [commentId]: cachedDetail,
+        }
+        setCommentDetailCache(commentDetailCacheRef.current)
+
+        if (activeCommentIdRef.current === commentId)
+          setActiveComment(cachedDetail)
+      }
+      else if (activeComment?.id === commentId) {
+        setActiveComment(activeComment)
+      }
+    }
+  }, [activeComment, appId, comments, setComments, setCommentDetailCache, setActiveComment])
+
+  const handleCommentReply = useCallback(async (commentId: string, content: string, mentionedUserIds: string[] = []) => {
+    if (!appId) return
+    const trimmed = content.trim()
+    if (!trimmed) return
+
+    setReplySubmitting(true)
+    try {
+      await createWorkflowCommentReply(appId, commentId, { content: trimmed, mentioned_user_ids: mentionedUserIds })
+
+      collaborationManager.emitCommentsUpdate(appId)
+
+      await refreshActiveComment(commentId)
+      await loadComments()
+    }
+    catch (error) {
+      console.error('Failed to create reply:', error)
+    }
+    finally {
+      setReplySubmitting(false)
+    }
+  }, [appId, loadComments, refreshActiveComment, setReplySubmitting])
+
+  const handleCommentReplyUpdate = useCallback(async (commentId: string, replyId: string, content: string, mentionedUserIds: string[] = []) => {
+    if (!appId) return
+    const trimmed = content.trim()
+    if (!trimmed) return
+
+    setReplyUpdating(true)
+    try {
+      await updateWorkflowCommentReply(appId, commentId, replyId, { content: trimmed, mentioned_user_ids: mentionedUserIds })
+
+      collaborationManager.emitCommentsUpdate(appId)
+
+      await refreshActiveComment(commentId)
+      await loadComments()
+    }
+    catch (error) {
+      console.error('Failed to update reply:', error)
+    }
+    finally {
+      setReplyUpdating(false)
+    }
+  }, [appId, loadComments, refreshActiveComment, setReplyUpdating])
+
+  const handleCommentReplyDelete = useCallback(async (commentId: string, replyId: string) => {
+    if (!appId) return
+
+    setActiveCommentLoading(true)
+    try {
+      await deleteWorkflowCommentReply(appId, commentId, replyId)
+
+      collaborationManager.emitCommentsUpdate(appId)
+
+      await refreshActiveComment(commentId)
+      await loadComments()
+    }
+    catch (error) {
+      console.error('Failed to delete reply:', error)
+    }
+    finally {
+      setActiveCommentLoading(false)
+    }
+  }, [appId, loadComments, refreshActiveComment, setActiveCommentLoading])
+
+  const handleCommentNavigate = useCallback((direction: 'prev' | 'next') => {
+    const currentId = activeCommentIdRef.current
+    if (!currentId) return
+    const idx = comments.findIndex(c => c.id === currentId)
+    if (idx === -1) return
+    const target = direction === 'prev' ? comments[idx - 1] : comments[idx + 1]
+    if (target)
+      handleCommentIconClick(target)
+  }, [comments, handleCommentIconClick])
+
+  const handleActiveCommentClose = useCallback(() => {
+    setActiveComment(null)
+    setActiveCommentLoading(false)
+    setActiveCommentId(null)
+    activeCommentIdRef.current = null
+  }, [setActiveComment, setActiveCommentId, setActiveCommentLoading])
+
+  const handleCreateComment = useCallback((mousePosition: {
+    pageX: number
+    pageY: number
+    elementX: number
+    elementY: number
+  }) => {
+    if (controlMode === ControlMode.Comment) {
+      console.log('Setting pending comment at screen position:', mousePosition)
+      setPendingComment(mousePosition)
+    }
+    else {
+      console.log('Control mode is not Comment:', controlMode)
+    }
+  }, [controlMode, setPendingComment])
+
+  return {
+    comments,
+    loading,
+    pendingComment,
+    activeComment,
+    activeCommentLoading,
+    replySubmitting,
+    replyUpdating,
+    handleCommentSubmit,
+    handleCommentCancel,
+    handleCommentIconClick,
+    handleActiveCommentClose,
+    handleCommentResolve,
+    handleCommentDelete,
+    handleCommentNavigate,
+    handleCommentReply,
+    handleCommentReplyUpdate,
+    handleCommentReplyDelete,
+    handleCommentPositionUpdate,
+    refreshActiveComment,
+    handleCreateComment,
+    loadComments,
+  }
+}

web/app/components/workflow/hooks/use-workflow-interactions.ts

@@ -1,7 +1,7 @@
 import {
   useCallback,
 } from 'react'
-import { useReactFlow, useStoreApi } from 'reactflow'
+import { useReactFlow } from 'reactflow'
 import { produce } from 'immer'
 import { useStore, useWorkflowStore } from '../store'
 import {
@@ -29,6 +29,9 @@ import { useNodesInteractionsWithoutSync } from './use-nodes-interactions-withou
 import { useNodesSyncDraft } from './use-nodes-sync-draft'
 import { WorkflowHistoryEvent, useWorkflowHistory } from './use-workflow-history'
 import { useEventEmitterContextContext } from '@/context/event-emitter'
+import { useCollaborativeWorkflow } from '@/app/components/workflow/hooks/use-collaborative-workflow'
+import { useStore as useAppStore } from '@/app/components/app/store'
+import { useGlobalPublicStore } from '@/context/global-public-context'
 
 export const useWorkflowInteractions = () => {
   const workflowStore = useWorkflowStore()
@@ -55,6 +58,9 @@ export const useWorkflowMoveMode = () => {
     getNodesReadOnly,
   } = useNodesReadOnly()
   const { handleSelectionCancel } = useSelectionInteractions()
+  const isCollaborationEnabled = useGlobalPublicStore(s => s.systemFeatures.enable_collaboration_mode)
+  const appDetail = useAppStore(state => state.appDetail)
+  const isCommentModeAvailable = isCollaborationEnabled && (appDetail?.mode === 'workflow' || appDetail?.mode === 'advanced-chat')
 
   const handleModePointer = useCallback(() => {
     if (getNodesReadOnly())
@@ -71,31 +77,40 @@ export const useWorkflowMoveMode = () => {
     handleSelectionCancel()
   }, [getNodesReadOnly, setControlMode, handleSelectionCancel])
 
+  const handleModeComment = useCallback(() => {
+    if (getNodesReadOnly() || !isCommentModeAvailable)
+      return
+
+    setControlMode(ControlMode.Comment)
+    handleSelectionCancel()
+  }, [getNodesReadOnly, setControlMode, handleSelectionCancel, isCommentModeAvailable])
+
   return {
     handleModePointer,
     handleModeHand,
+    handleModeComment,
+    isCommentModeAvailable,
   }
 }
 
 export const useWorkflowOrganize = () => {
   const workflowStore = useWorkflowStore()
-  const store = useStoreApi()
   const reactflow = useReactFlow()
   const { getNodesReadOnly } = useNodesReadOnly()
   const { saveStateToHistory } = useWorkflowHistory()
   const { handleSyncWorkflowDraft } = useNodesSyncDraft()
+  const collaborativeWorkflow = useCollaborativeWorkflow()
 
   const handleLayout = useCallback(async () => {
     if (getNodesReadOnly())
       return
     workflowStore.setState({ nodeAnimation: true })
     const {
-      getNodes,
+      nodes,
       edges,
       setNodes,
-    } = store.getState()
+    } = collaborativeWorkflow.getState()
     const { setViewport } = reactflow
-    const nodes = getNodes()
 
     const loopAndIterationNodes = nodes.filter(
       node => (node.data.type === BlockEnum.Loop || node.data.type === BlockEnum.Iteration)
@@ -232,7 +247,7 @@ export const useWorkflowOrganize = () => {
     setTimeout(() => {
       handleSyncWorkflowDraft()
     })
-  }, [getNodesReadOnly, store, reactflow, workflowStore, handleSyncWorkflowDraft, saveStateToHistory])
+  }, [getNodesReadOnly, collaborativeWorkflow, reactflow, workflowStore, handleSyncWorkflowDraft, saveStateToHistory])
 
   return {
     handleLayout,

web/app/components/workflow/hooks/use-workflow.ts

@@ -5,7 +5,6 @@ import { uniqBy } from 'lodash-es'
 import {
   getIncomers,
   getOutgoers,
-  useStoreApi,
 } from 'reactflow'
 import type {
   Connection,
@@ -37,6 +36,8 @@ import { findUsedVarNodes, getNodeOutputVars, updateNodeVars } from '../nodes/_b
 import { useAvailableBlocks } from './use-available-blocks'
 import { useStore as useAppStore } from '@/app/components/app/store'
 
+import { useCollaborativeWorkflow } from '@/app/components/workflow/hooks/use-collaborative-workflow'
+
 import { CUSTOM_ITERATION_START_NODE } from '@/app/components/workflow/nodes/iteration-start/constants'
 import { CUSTOM_LOOP_START_NODE } from '@/app/components/workflow/nodes/loop-start/constants'
 import { useNodesMetaData } from '.'
@@ -49,26 +50,18 @@ export const useIsChatMode = () => {
 }
 
 export const useWorkflow = () => {
-  const store = useStoreApi()
+  const collaborativeWorkflow = useCollaborativeWorkflow()
   const { getAvailableBlocks } = useAvailableBlocks()
   const { nodesMap } = useNodesMetaData()
 
   const getNodeById = useCallback((nodeId: string) => {
-    const {
-      getNodes,
-    } = store.getState()
-    const nodes = getNodes()
+    const { nodes } = collaborativeWorkflow.getState()
     const currentNode = nodes.find(node => node.id === nodeId)
     return currentNode
-  }, [store])
+  }, [collaborativeWorkflow])
 
   const getTreeLeafNodes = useCallback((nodeId: string) => {
-    const {
-      getNodes,
-      edges,
-    } = store.getState()
-    const nodes = getNodes()
-    // let startNode = getWorkflowEntryNode(nodes)
+    const { nodes, edges } = collaborativeWorkflow.getState()
     const currentNode = nodes.find(node => node.id === nodeId)
 
     let startNodes = nodes.filter(node => nodesMap?.[node.data.type as BlockEnum]?.metaData.isStart) || []
@@ -111,14 +104,11 @@ export const useWorkflow = () => {
     return uniqBy(list, 'id').filter((item: Node) => {
       return SUPPORT_OUTPUT_VARS_NODE.includes(item.data.type)
     })
-  }, [store, nodesMap])
+  }, [collaborativeWorkflow, nodesMap])
 
   const getBeforeNodesInSameBranch = useCallback((nodeId: string, newNodes?: Node[], newEdges?: Edge[]) => {
-    const {
-      getNodes,
-      edges,
-    } = store.getState()
-    const nodes = newNodes || getNodes()
+    const { nodes: oldNodes, edges } = collaborativeWorkflow.getState()
+    const nodes = newNodes || oldNodes
     const currentNode = nodes.find(node => node.id === nodeId)
 
     const list: Node[] = []
@@ -161,14 +151,11 @@ export const useWorkflow = () => {
     }
 
     return []
-  }, [store])
+  }, [collaborativeWorkflow])
 
   const getBeforeNodesInSameBranchIncludeParent = useCallback((nodeId: string, newNodes?: Node[], newEdges?: Edge[]) => {
     const nodes = getBeforeNodesInSameBranch(nodeId, newNodes, newEdges)
-    const {
-      getNodes,
-    } = store.getState()
-    const allNodes = getNodes()
+    const { nodes: allNodes } = collaborativeWorkflow.getState()
     const node = allNodes.find(n => n.id === nodeId)
     const parentNodeId = node?.parentId
     const parentNode = allNodes.find(n => n.id === parentNodeId)
@@ -176,14 +163,10 @@ export const useWorkflow = () => {
       nodes.push(parentNode)
 
     return nodes
-  }, [getBeforeNodesInSameBranch, store])
+  }, [getBeforeNodesInSameBranch, collaborativeWorkflow])
 
   const getAfterNodesInSameBranch = useCallback((nodeId: string) => {
-    const {
-      getNodes,
-      edges,
-    } = store.getState()
-    const nodes = getNodes()
+    const { nodes, edges } = collaborativeWorkflow.getState()
     const currentNode = nodes.find(node => node.id === nodeId)!
 
     if (!currentNode)
@@ -207,40 +190,29 @@ export const useWorkflow = () => {
     })
 
     return uniqBy(list, 'id')
-  }, [store])
+  }, [collaborativeWorkflow])
 
   const getBeforeNodeById = useCallback((nodeId: string) => {
-    const {
-      getNodes,
-      edges,
-    } = store.getState()
-    const nodes = getNodes()
+    const { nodes, edges } = collaborativeWorkflow.getState()
     const node = nodes.find(node => node.id === nodeId)!
 
     return getIncomers(node, nodes, edges)
-  }, [store])
+  }, [collaborativeWorkflow])
 
   const getIterationNodeChildren = useCallback((nodeId: string) => {
-    const {
-      getNodes,
-    } = store.getState()
-    const nodes = getNodes()
+    const { nodes } = collaborativeWorkflow.getState()
 
     return nodes.filter(node => node.parentId === nodeId)
-  }, [store])
+  }, [collaborativeWorkflow])
 
   const getLoopNodeChildren = useCallback((nodeId: string) => {
-    const {
-      getNodes,
-    } = store.getState()
-    const nodes = getNodes()
+    const { nodes } = collaborativeWorkflow.getState()
 
     return nodes.filter(node => node.parentId === nodeId)
-  }, [store])
+  }, [collaborativeWorkflow])
 
   const isFromStartNode = useCallback((nodeId: string) => {
-    const { getNodes } = store.getState()
-    const nodes = getNodes()
+    const { nodes } = collaborativeWorkflow.getState()
     const currentNode = nodes.find(node => node.id === nodeId)
 
     if (!currentNode)
@@ -263,11 +235,10 @@ export const useWorkflow = () => {
     }
 
     return checkPreviousNodes(currentNode)
-  }, [store, getBeforeNodeById])
+  }, [collaborativeWorkflow, getBeforeNodeById])
 
   const handleOutVarRenameChange = useCallback((nodeId: string, oldValeSelector: ValueSelector, newVarSelector: ValueSelector) => {
-    const { getNodes, setNodes } = store.getState()
-    const allNodes = getNodes()
+    const { nodes: allNodes, setNodes } = collaborativeWorkflow.getState()
     const affectedNodes = findUsedVarNodes(oldValeSelector, allNodes)
     if (affectedNodes.length > 0) {
       const newNodes = allNodes.map((node) => {
@@ -278,7 +249,7 @@ export const useWorkflow = () => {
       })
       setNodes(newNodes)
     }
-  }, [store])
+  }, [collaborativeWorkflow])
 
   const isVarUsedInNodes = useCallback((varSelector: ValueSelector) => {
     const nodeId = varSelector[0]
@@ -289,11 +260,11 @@ export const useWorkflow = () => {
 
   const removeUsedVarInNodes = useCallback((varSelector: ValueSelector) => {
     const nodeId = varSelector[0]
-    const { getNodes, setNodes } = store.getState()
+    const { nodes, setNodes } = collaborativeWorkflow.getState()
     const afterNodes = getAfterNodesInSameBranch(nodeId)
     const effectNodes = findUsedVarNodes(varSelector, afterNodes)
     if (effectNodes.length > 0) {
-      const newNodes = getNodes().map((node) => {
+      const newNodes = nodes.map((node) => {
         if (effectNodes.find(n => n.id === node.id))
           return updateNodeVars(node, varSelector, [])
 
@@ -301,7 +272,7 @@ export const useWorkflow = () => {
       })
       setNodes(newNodes)
     }
-  }, [getAfterNodesInSameBranch, store])
+  }, [getAfterNodesInSameBranch, collaborativeWorkflow])
 
   const isNodeVarsUsedInNodes = useCallback((node: Node, isChatMode: boolean) => {
     const outputVars = getNodeOutputVars(node, isChatMode)
@@ -312,11 +283,7 @@ export const useWorkflow = () => {
   }, [isVarUsedInNodes])
 
   const getRootNodesById = useCallback((nodeId: string) => {
-    const {
-      getNodes,
-      edges,
-    } = store.getState()
-    const nodes = getNodes()
+    const { nodes, edges } = collaborativeWorkflow.getState()
     const currentNode = nodes.find(node => node.id === nodeId)
 
     const rootNodes: Node[] = []
@@ -356,7 +323,7 @@ export const useWorkflow = () => {
       return uniqBy(rootNodes, 'id')
 
     return []
-  }, [store])
+  }, [collaborativeWorkflow])
 
   const getStartNodes = useCallback((nodes: Node[], currentNode?: Node) => {
     const { id, parentId } = currentNode || {}
@@ -382,11 +349,7 @@ export const useWorkflow = () => {
   }, [nodesMap, getRootNodesById])
 
   const isValidConnection = useCallback(({ source, sourceHandle: _sourceHandle, target }: Connection) => {
-    const {
-      edges,
-      getNodes,
-    } = store.getState()
-    const nodes = getNodes()
+    const { nodes, edges } = collaborativeWorkflow.getState()
     const sourceNode: Node = nodes.find(node => node.id === source)!
     const targetNode: Node = nodes.find(node => node.id === target)!
 
@@ -422,14 +385,13 @@ export const useWorkflow = () => {
     }
 
     return !hasCycle(targetNode)
-  }, [store, getAvailableBlocks])
+  }, [collaborativeWorkflow, getAvailableBlocks])
 
   const getNode = useCallback((nodeId?: string) => {
-    const { getNodes } = store.getState()
-    const nodes = getNodes()
+    const { nodes } = collaborativeWorkflow.getState()
 
     return nodes.find(node => node.id === nodeId) || getWorkflowEntryNode(nodes)
-  }, [store])
+  }, [collaborativeWorkflow])
 
   return {
     getNodeById,
@@ -489,13 +451,10 @@ export const useNodesReadOnly = () => {
 }
 
 export const useIsNodeInIteration = (iterationId: string) => {
-  const store = useStoreApi()
+  const collaborativeWorkflow = useCollaborativeWorkflow()
 
   const isNodeInIteration = useCallback((nodeId: string) => {
-    const {
-      getNodes,
-    } = store.getState()
-    const nodes = getNodes()
+    const { nodes } = collaborativeWorkflow.getState()
     const node = nodes.find(node => node.id === nodeId)
 
     if (!node)
@@ -505,20 +464,17 @@ export const useIsNodeInIteration = (iterationId: string) => {
       return true
 
     return false
-  }, [iterationId, store])
+  }, [iterationId, collaborativeWorkflow])
   return {
     isNodeInIteration,
   }
 }
 
 export const useIsNodeInLoop = (loopId: string) => {
-  const store = useStoreApi()
+  const collaborativeWorkflow = useCollaborativeWorkflow()
 
   const isNodeInLoop = useCallback((nodeId: string) => {
-    const {
-      getNodes,
-    } = store.getState()
-    const nodes = getNodes()
+    const { nodes } = collaborativeWorkflow.getState()
     const node = nodes.find(node => node.id === nodeId)
 
     if (!node)
@@ -528,7 +484,7 @@ export const useIsNodeInLoop = (loopId: string) => {
       return true
 
     return false
-  }, [loopId, store])
+  }, [loopId, collaborativeWorkflow])
   return {
     isNodeInLoop,
   }

web/app/components/workflow/index.tsx

@@ -2,6 +2,7 @@
 
 import type { FC } from 'react'
 import {
+  Fragment,
   memo,
   useCallback,
   useEffect,
@@ -9,6 +10,7 @@ import {
   useRef,
   useState,
 } from 'react'
+import { useTranslation } from 'react-i18next'
 import { setAutoFreeze } from 'immer'
 import {
   useEventListener,
@@ -66,11 +68,15 @@ import CustomEdge from './custom-edge'
 import CustomConnectionLine from './custom-connection-line'
 import HelpLine from './help-line'
 import CandidateNode from './candidate-node'
+import CommentManager from './comment-manager'
 import PanelContextmenu from './panel-contextmenu'
 import NodeContextmenu from './node-contextmenu'
 import SelectionContextmenu from './selection-contextmenu'
 import SyncingDataModal from './syncing-data-modal'
 import { setupScrollToNodeListener } from './utils/node-navigation'
+import { CommentCursor, CommentIcon, CommentInput, CommentThread } from './comment'
+import { useWorkflowComment } from './hooks/use-workflow-comment'
+import UserCursors from './collaboration/components/user-cursors'
 import {
   useStore,
   useWorkflowStore,
@@ -120,6 +126,9 @@ export type WorkflowProps = {
   viewport?: Viewport
   children?: React.ReactNode
   onWorkflowDataUpdate?: (v: any) => void
+  cursors?: Record<string, any>
+  myUserId?: string | null
+  onlineUsers?: any[]
 }
 export const Workflow: FC<WorkflowProps> = memo(({
   nodes: originalNodes,
@@ -127,10 +136,14 @@ export const Workflow: FC<WorkflowProps> = memo(({
   viewport,
   children,
   onWorkflowDataUpdate,
+  cursors,
+  myUserId,
+  onlineUsers,
 }) => {
   const workflowContainerRef = useRef<HTMLDivElement>(null)
   const workflowStore = useWorkflowStore()
   const reactflow = useReactFlow()
+  const [isMouseOverCanvas, setIsMouseOverCanvas] = useState(false)
   const [nodes, setNodes] = useNodesState(originalNodes)
   const [edges, setEdges] = useEdgesState(originalEdges)
   const controlMode = useStore(s => s.controlMode)
@@ -175,6 +188,29 @@ export const Workflow: FC<WorkflowProps> = memo(({
   const { workflowReadOnly } = useWorkflowReadOnly()
   const { nodesReadOnly } = useNodesReadOnly()
   const { eventEmitter } = useEventEmitterContextContext()
+  const {
+    comments,
+    pendingComment,
+    activeComment,
+    activeCommentLoading,
+    replySubmitting,
+    replyUpdating,
+    handleCommentSubmit,
+    handleCommentCancel,
+    handleCommentIconClick,
+    handleActiveCommentClose,
+    handleCommentResolve,
+    handleCommentDelete,
+    handleCommentNavigate,
+    handleCommentReply,
+    handleCommentReplyUpdate,
+    handleCommentReplyDelete,
+    handleCommentPositionUpdate,
+  } = useWorkflowComment()
+  const showUserComments = useStore(s => s.showUserComments)
+  const showUserCursors = useStore(s => s.showUserCursors)
+  const isCommentPreviewHovering = useStore(s => s.isCommentPreviewHovering)
+  const { t } = useTranslation()
 
   eventEmitter?.useSubscription((v: any) => {
     if (v.type === WORKFLOW_DATA_UPDATE) {
@@ -215,6 +251,33 @@ export const Workflow: FC<WorkflowProps> = memo(({
       setTimeout(() => handleRefreshWorkflowDraft(), 500)
   }, [syncWorkflowDraftWhenPageClose, handleRefreshWorkflowDraft])
 
+  // Optimized comment deletion using showConfirm
+  const handleCommentDeleteClick = useCallback((commentId: string) => {
+    if (!showConfirm) {
+      setShowConfirm({
+        title: t('workflow.comments.confirm.deleteThreadTitle'),
+        desc: t('workflow.comments.confirm.deleteThreadDesc'),
+        onConfirm: async () => {
+          await handleCommentDelete(commentId)
+          setShowConfirm(undefined)
+        },
+      })
+    }
+  }, [showConfirm, setShowConfirm, handleCommentDelete, t])
+
+  const handleCommentReplyDeleteClick = useCallback((commentId: string, replyId: string) => {
+    if (!showConfirm) {
+      setShowConfirm({
+        title: t('workflow.comments.confirm.deleteReplyTitle'),
+        desc: t('workflow.comments.confirm.deleteReplyDesc'),
+        onConfirm: async () => {
+          await handleCommentReplyDelete(commentId, replyId)
+          setShowConfirm(undefined)
+        },
+      })
+    }
+  }, [showConfirm, setShowConfirm, handleCommentReplyDelete, t])
+
   useEffect(() => {
     document.addEventListener('visibilitychange', handleSyncWorkflowDraftWhenPageClose)
 
@@ -245,6 +308,9 @@ export const Workflow: FC<WorkflowProps> = memo(({
           elementY: e.clientY - containerClientRect.top,
         },
       })
+      const target = e.target as HTMLElement
+      const onPane = !!target?.closest('.react-flow__pane')
+      setIsMouseOverCanvas(onPane)
     }
   })
 
@@ -345,7 +411,7 @@ export const Workflow: FC<WorkflowProps> = memo(({
     <div
       id='workflow-container'
       className={cn(
-        'relative h-full w-full min-w-[960px]',
+        'relative h-full w-full min-w-[960px] overflow-hidden',
         workflowReadOnly && 'workflow-panel-animation',
         nodeAnimation && 'workflow-node-animation',
       )}
@@ -353,8 +419,9 @@ export const Workflow: FC<WorkflowProps> = memo(({
     >
       <SyncingDataModal />
       <CandidateNode />
+      <CommentManager />
       <div
-        className='pointer-events-none absolute left-0 top-0 z-10 flex w-12 items-center justify-center p-1 pl-2'
+        className='pointer-events-none absolute left-0 top-0 z-[65] flex w-12 items-center justify-center p-1 pl-2'
         style={{ height: controlHeight }}
       >
         <Control />
@@ -364,23 +431,81 @@ export const Workflow: FC<WorkflowProps> = memo(({
       <NodeContextmenu />
       <SelectionContextmenu />
       <HelpLine />
-      {
-        !!showConfirm && (
-          <Confirm
-            isShow
-            onCancel={() => setShowConfirm(undefined)}
-            onConfirm={showConfirm.onConfirm}
-            title={showConfirm.title}
-            content={showConfirm.desc}
+      {!!showConfirm && (
+        <Confirm
+          isShow
+          onCancel={() => setShowConfirm(undefined)}
+          onConfirm={showConfirm.onConfirm}
+          title={showConfirm.title}
+          content={showConfirm.desc}
+        />
+      )}
+      {controlMode === ControlMode.Comment && isMouseOverCanvas && (
+        <CommentCursor />
+      )}
+      {pendingComment && (
+        <CommentInput
+          position={{
+            x: pendingComment.elementX,
+            y: pendingComment.elementY,
+          }}
+          onSubmit={handleCommentSubmit}
+          onCancel={handleCommentCancel}
+        />
+      )}
+      {comments.map((comment, index) => {
+        const isActive = activeComment?.id === comment.id
+
+        if (isActive && activeComment) {
+          const canGoPrev = index > 0
+          const canGoNext = index < comments.length - 1
+          return (
+            <Fragment key={comment.id}>
+              <CommentIcon
+                key={`${comment.id}-icon`}
+                comment={comment}
+                onClick={() => handleCommentIconClick(comment)}
+                isActive={true}
+                onPositionUpdate={position => handleCommentPositionUpdate(comment.id, position)}
+              />
+              <CommentThread
+                key={`${comment.id}-thread`}
+                comment={activeComment}
+                loading={activeCommentLoading}
+                replySubmitting={replySubmitting}
+                replyUpdating={replyUpdating}
+                onClose={handleActiveCommentClose}
+                onResolve={() => handleCommentResolve(comment.id)}
+                onDelete={() => handleCommentDeleteClick(comment.id)}
+                onPrev={canGoPrev ? () => handleCommentNavigate('prev') : undefined}
+                onNext={canGoNext ? () => handleCommentNavigate('next') : undefined}
+                onReply={(content, ids) => handleCommentReply(comment.id, content, ids ?? [])}
+                onReplyEdit={(replyId, content, ids) => handleCommentReplyUpdate(comment.id, replyId, content, ids ?? [])}
+                onReplyDelete={replyId => handleCommentReplyDeleteClick(comment.id, replyId)}
+                onReplyDeleteDirect={replyId => handleCommentReplyDelete(comment.id, replyId)}
+                canGoPrev={canGoPrev}
+                canGoNext={canGoNext}
+              />
+            </Fragment>
+          )
+        }
+
+        return (showUserComments || controlMode === ControlMode.Comment) ? (
+          <CommentIcon
+            key={comment.id}
+            comment={comment}
+            onClick={() => handleCommentIconClick(comment)}
+            onPositionUpdate={position => handleCommentPositionUpdate(comment.id, position)}
           />
-        )
-      }
+        ) : null
+      })}
       {children}
       <ReactFlow
         nodeTypes={nodeTypes}
         edgeTypes={edgeTypes}
         nodes={nodes}
         edges={edges}
+        className={controlMode === ControlMode.Comment ? 'comment-mode-flow' : ''}
         onNodeDragStart={handleNodeDragStart}
         onNodeDrag={handleNodeDrag}
         onNodeDragStop={handleNodeDragStop}
@@ -405,13 +530,13 @@ export const Workflow: FC<WorkflowProps> = memo(({
         defaultViewport={viewport}
         multiSelectionKeyCode={null}
         deleteKeyCode={null}
-        nodesDraggable={!nodesReadOnly}
+        nodesDraggable={!nodesReadOnly && controlMode !== ControlMode.Comment}
         nodesConnectable={!nodesReadOnly}
         nodesFocusable={!nodesReadOnly}
         edgesFocusable={!nodesReadOnly}
         panOnScroll={false}
         panOnDrag={controlMode === ControlMode.Hand}
-        zoomOnPinch={true}
+        zoomOnPinch={!isCommentPreviewHovering}
         zoomOnScroll={true}
         zoomOnDoubleClick={true}
         isValidConnection={isValidConnection}
@@ -426,6 +551,13 @@ export const Workflow: FC<WorkflowProps> = memo(({
           className="bg-workflow-canvas-workflow-bg"
           color='var(--color-workflow-canvas-workflow-dot-color)'
         />
+        {showUserCursors && cursors && (
+          <UserCursors
+            cursors={cursors}
+            myUserId={myUserId || null}
+            onlineUsers={onlineUsers || []}
+          />
+        )}
       </ReactFlow>
     </div>
   )
@@ -433,14 +565,25 @@ export const Workflow: FC<WorkflowProps> = memo(({
 
 type WorkflowWithInnerContextProps = WorkflowProps & {
   hooksStore?: Partial<HooksStoreShape>
+  cursors?: Record<string, any>
+  myUserId?: string | null
+  onlineUsers?: any[]
 }
 export const WorkflowWithInnerContext = memo(({
   hooksStore,
+  cursors,
+  myUserId,
+  onlineUsers,
   ...restProps
 }: WorkflowWithInnerContextProps) => {
   return (
     <HooksStoreContextProvider {...hooksStore}>
-      <Workflow {...restProps} />
+      <Workflow
+        {...restProps}
+        cursors={cursors}
+        myUserId={myUserId}
+        onlineUsers={onlineUsers}
+      />
     </HooksStoreContextProvider>
   )
 })

web/app/components/workflow/nodes/_base/components/error-handle/hooks.ts

@@ -30,8 +30,15 @@ export const useDefaultValue = (
     const index = default_value.findIndex(form => form.key === key)
 
     if (index > -1) {
-      const newDefaultValue = [...default_value]
-      newDefaultValue[index].value = value
+      const newDefaultValue = default_value.map((form) => {
+        if (form.key !== key)
+          return form
+        // clone the entry so we do not mutate the original reference (which would block CRDT diffs)
+        return {
+          ...form,
+          value,
+        }
+      })
       handleNodeDataUpdateWithSyncDraft({
         id,
         data: {