diff --git a/api/services/async_workflow_service.py b/api/services/async_workflow_service.py
index 5221f8f391..3b20ec500a 100644
--- a/api/services/async_workflow_service.py
+++ b/api/services/async_workflow_service.py
@@ -20,7 +20,7 @@ from models.enums import CreatorUserRole
 from models.model import App, EndUser
 from models.workflow import Workflow, WorkflowTriggerLog, WorkflowTriggerStatus
 from repositories.sqlalchemy_workflow_trigger_log_repository import SQLAlchemyWorkflowTriggerLogRepository
-from services.errors.llm import InvokeRateLimitError
+from services.errors.app import InvokeDailyRateLimitError, WorkflowNotFoundError
 from services.workflow.entities import AsyncTriggerResponse, TriggerData, WorkflowTaskData
 from services.workflow.queue_dispatcher import QueueDispatcherManager, QueuePriority
 from services.workflow.rate_limiter import TenantDailyRateLimiter
@@ -69,8 +69,8 @@ class AsyncWorkflowService:
             Note: The actual workflow execution status must be checked separately via workflow_trigger_log_id
 
         Raises:
-            ValueError: If app or workflow not found
-            InvokeRateLimitError: If daily rate limit exceeded
+            WorkflowNotFoundError: If app or workflow not found
+            InvokeDailyRateLimitError: If daily rate limit exceeded
 
         Behavior:
             - Non-blocking: Returns immediately after queuing
@@ -86,7 +86,7 @@ class AsyncWorkflowService:
         # 1. Validate app exists
         app_model = session.scalar(select(App).where(App.id == trigger_data.app_id))
         if not app_model:
-            raise ValueError(f"App not found: {trigger_data.app_id}")
+            raise WorkflowNotFoundError(f"App not found: {trigger_data.app_id}")
 
         # 2. Get workflow
         workflow = cls._get_workflow(workflow_service, app_model, trigger_data.workflow_id)
@@ -138,7 +138,7 @@ class AsyncWorkflowService:
 
             reset_time = rate_limiter.get_quota_reset_time(trigger_data.tenant_id, tenant_owner_tz)
 
-            raise InvokeRateLimitError(
+            raise InvokeDailyRateLimitError(
                 f"Daily workflow execution limit reached. "
                 f"Limit resets at {reset_time.strftime('%Y-%m-%d %H:%M:%S %Z')}. "
                 f"Remaining quota: {remaining}"
@@ -305,17 +305,17 @@ class AsyncWorkflowService:
             Workflow instance
 
         Raises:
-            ValueError: If workflow not found
+            WorkflowNotFoundError: If workflow not found
         """
         if workflow_id:
             # Get specific published workflow
             workflow = workflow_service.get_published_workflow_by_id(app_model, workflow_id)
             if not workflow:
-                raise ValueError(f"Published workflow not found: {workflow_id}")
+                raise WorkflowNotFoundError(f"Published workflow not found: {workflow_id}")
         else:
             # Get default published workflow
             workflow = workflow_service.get_published_workflow(app_model)
             if not workflow:
-                raise ValueError(f"No published workflow found for app: {app_model.id}")
+                raise WorkflowNotFoundError(f"No published workflow found for app: {app_model.id}")
 
         return workflow
diff --git a/api/services/errors/app.py b/api/services/errors/app.py
index 390716a47f..7bb142eb8d 100644
--- a/api/services/errors/app.py
+++ b/api/services/errors/app.py
@@ -16,3 +16,8 @@ class WorkflowNotFoundError(Exception):
 
 class WorkflowIdFormatError(Exception):
     pass
+
+
+class InvokeDailyRateLimitError(Exception):
+    """Raised when daily rate limit is exceeded for workflow invocations."""
+    pass
diff --git a/api/tasks/async_workflow_tasks.py b/api/tasks/async_workflow_tasks.py
index 50824df078..6fc96f5155 100644
--- a/api/tasks/async_workflow_tasks.py
+++ b/api/tasks/async_workflow_tasks.py
@@ -21,6 +21,7 @@ from models.enums import CreatorUserRole
 from models.model import App, EndUser, Tenant
 from models.workflow import Workflow, WorkflowTriggerLog, WorkflowTriggerStatus
 from repositories.sqlalchemy_workflow_trigger_log_repository import SQLAlchemyWorkflowTriggerLogRepository
+from services.errors.app import WorkflowNotFoundError
 from services.workflow.entities import AsyncTriggerExecutionResult, AsyncTriggerStatus, TriggerData, WorkflowTaskData
 
 # Determine queue names based on edition
@@ -99,11 +100,11 @@ def _execute_workflow_common(task_data: WorkflowTaskData) -> AsyncTriggerExecuti
             app_model = session.scalar(select(App).where(App.id == trigger_log.app_id))
 
             if not app_model:
-                raise ValueError(f"App not found: {trigger_log.app_id}")
+                raise WorkflowNotFoundError(f"App not found: {trigger_log.app_id}")
 
             workflow = session.scalar(select(Workflow).where(Workflow.id == trigger_log.workflow_id))
             if not workflow:
-                raise ValueError(f"Workflow not found: {trigger_log.workflow_id}")
+                raise WorkflowNotFoundError(f"Workflow not found: {trigger_log.workflow_id}")
 
             user = _get_user(session, trigger_log)