diff --git a/api/core/tools/tool_manager.py b/api/core/tools/tool_manager.py
index 7f7787b92a..23a877b7e3 100644
--- a/api/core/tools/tool_manager.py
+++ b/api/core/tools/tool_manager.py
@@ -72,6 +72,11 @@ class ApiProviderControllerItem(TypedDict):
     controller: ApiToolProviderController
 
 
+class EmojiIconDict(TypedDict):
+    background: str
+    content: str
+
+
 class ToolManager:
     _builtin_provider_lock = Lock()
     _hardcoded_providers: dict[str, BuiltinToolProviderController] = {}
@@ -916,7 +921,7 @@ class ToolManager:
         )
 
     @classmethod
-    def generate_workflow_tool_icon_url(cls, tenant_id: str, provider_id: str) -> Mapping[str, str]:
+    def generate_workflow_tool_icon_url(cls, tenant_id: str, provider_id: str) -> EmojiIconDict:
         try:
             workflow_provider: WorkflowToolProvider | None = (
                 db.session.query(WorkflowToolProvider)
@@ -933,7 +938,7 @@ class ToolManager:
             return {"background": "#252525", "content": "\ud83d\ude01"}
 
     @classmethod
-    def generate_api_tool_icon_url(cls, tenant_id: str, provider_id: str) -> Mapping[str, str]:
+    def generate_api_tool_icon_url(cls, tenant_id: str, provider_id: str) -> EmojiIconDict:
         try:
             api_provider: ApiToolProvider | None = (
                 db.session.query(ApiToolProvider)
@@ -950,7 +955,7 @@ class ToolManager:
             return {"background": "#252525", "content": "\ud83d\ude01"}
 
     @classmethod
-    def generate_mcp_tool_icon_url(cls, tenant_id: str, provider_id: str) -> Mapping[str, str] | str:
+    def generate_mcp_tool_icon_url(cls, tenant_id: str, provider_id: str) -> EmojiIconDict | dict[str, str] | str:
         try:
             with Session(db.engine) as session:
                 mcp_service = MCPToolManageService(session=session)
@@ -970,7 +975,7 @@ class ToolManager:
         tenant_id: str,
         provider_type: ToolProviderType,
         provider_id: str,
-    ) -> str | Mapping[str, str]:
+    ) -> str | EmojiIconDict | dict[str, str]:
         """
         get the tool icon
 
diff --git a/api/core/tools/utils/dataset_retriever/dataset_multi_retriever_tool.py b/api/core/tools/utils/dataset_retriever/dataset_multi_retriever_tool.py
index 3dbbbe6563..c2b520fa99 100644
--- a/api/core/tools/utils/dataset_retriever/dataset_multi_retriever_tool.py
+++ b/api/core/tools/utils/dataset_retriever/dataset_multi_retriever_tool.py
@@ -1,5 +1,4 @@
 import threading
-from typing import Any
 
 from flask import Flask, current_app
 from pydantic import BaseModel, Field
@@ -13,11 +12,12 @@ from core.rag.models.document import Document as RagDocument
 from core.rag.rerank.rerank_model import RerankModelRunner
 from core.rag.retrieval.retrieval_methods import RetrievalMethod
 from core.tools.utils.dataset_retriever.dataset_retriever_base_tool import DatasetRetrieverBaseTool
+from core.tools.utils.dataset_retriever.dataset_retriever_tool import DefaultRetrievalModelDict
 from dify_graph.model_runtime.entities.model_entities import ModelType
 from extensions.ext_database import db
 from models.dataset import Dataset, Document, DocumentSegment
 
-default_retrieval_model: dict[str, Any] = {
+default_retrieval_model: DefaultRetrievalModelDict = {
     "search_method": RetrievalMethod.SEMANTIC_SEARCH,
     "reranking_enable": False,
     "reranking_model": {"reranking_provider_name": "", "reranking_model_name": ""},
diff --git a/api/core/tools/utils/dataset_retriever/dataset_retriever_tool.py b/api/core/tools/utils/dataset_retriever/dataset_retriever_tool.py
index 057ec41f65..2969fafe89 100644
--- a/api/core/tools/utils/dataset_retriever/dataset_retriever_tool.py
+++ b/api/core/tools/utils/dataset_retriever/dataset_retriever_tool.py
@@ -1,4 +1,4 @@
-from typing import Any, cast
+from typing import NotRequired, TypedDict, cast
 
 from pydantic import BaseModel, Field
 from sqlalchemy import select
@@ -16,7 +16,19 @@ from models.dataset import Dataset
 from models.dataset import Document as DatasetDocument
 from services.external_knowledge_service import ExternalDatasetService
 
-default_retrieval_model: dict[str, Any] = {
+
+class DefaultRetrievalModelDict(TypedDict):
+    search_method: RetrievalMethod
+    reranking_enable: bool
+    reranking_model: dict[str, str]
+    reranking_mode: NotRequired[str]
+    weights: NotRequired[dict[str, object] | None]
+    score_threshold: NotRequired[float]
+    top_k: int
+    score_threshold_enabled: bool
+
+
+default_retrieval_model: DefaultRetrievalModelDict = {
     "search_method": RetrievalMethod.SEMANTIC_SEARCH,
     "reranking_enable": False,
     "reranking_model": {"reranking_provider_name": "", "reranking_model_name": ""},
@@ -125,7 +137,7 @@ class DatasetRetrieverTool(DatasetRetrieverBaseTool):
             if metadata_condition and not document_ids_filter:
                 return ""
             # get retrieval model , if the model is not setting , using default
-            retrieval_model: dict[str, Any] = dataset.retrieval_model or default_retrieval_model
+            retrieval_model = dataset.retrieval_model or default_retrieval_model
             retrieval_resource_list: list[RetrievalSourceMetadata] = []
             if dataset.indexing_technique == "economy":
                 # use keyword table query
diff --git a/api/core/tools/utils/parser.py b/api/core/tools/utils/parser.py
index fc2b41d960..f7484b93fb 100644
--- a/api/core/tools/utils/parser.py
+++ b/api/core/tools/utils/parser.py
@@ -1,4 +1,5 @@
 import re
+from collections.abc import Mapping
 from json import dumps as json_dumps
 from json import loads as json_loads
 from json.decoder import JSONDecodeError
@@ -20,10 +21,18 @@ class InterfaceDict(TypedDict):
     operation: dict[str, Any]
 
 
+class OpenAPISpecDict(TypedDict):
+    openapi: str
+    info: dict[str, str]
+    servers: list[dict[str, Any]]
+    paths: dict[str, Any]
+    components: dict[str, Any]
+
+
 class ApiBasedToolSchemaParser:
     @staticmethod
     def parse_openapi_to_tool_bundle(
-        openapi: dict, extra_info: dict | None = None, warning: dict | None = None
+        openapi: Mapping[str, Any], extra_info: dict | None = None, warning: dict | None = None
     ) -> list[ApiToolBundle]:
         warning = warning if warning is not None else {}
         extra_info = extra_info if extra_info is not None else {}
@@ -277,7 +286,7 @@ class ApiBasedToolSchemaParser:
     @staticmethod
     def parse_swagger_to_openapi(
         swagger: dict, extra_info: dict | None = None, warning: dict | None = None
-    ) -> dict[str, Any]:
+    ) -> OpenAPISpecDict:
         warning = warning or {}
         """
         parse swagger to openapi
@@ -293,7 +302,7 @@ class ApiBasedToolSchemaParser:
         if len(servers) == 0:
             raise ToolApiSchemaError("No server found in the swagger yaml.")
 
-        converted_openapi: dict[str, Any] = {
+        converted_openapi: OpenAPISpecDict = {
             "openapi": "3.0.0",
             "info": {
                 "title": info.get("title", "Swagger"),