fix: Resolve remaining type-checker and lint issues

- Fix ToolUsage constructor to only accept executable tools
- Remove unused imports from langgraph adapter
- Filter tools correctly for mixed type handling

Co-Authored-By: João <joao@crewai.com>

src/crewai/agents/agent_adapters/langgraph/langgraph_adapter.py

@@ -1,4 +1,4 @@
-from typing import Any, AsyncIterable, Dict, List, Optional, Union
+from typing import Any, Dict, List, Optional, Union
 
 from pydantic import Field, PrivateAttr
 
@@ -22,7 +22,6 @@ from crewai.utilities.events.agent_events import (
 )
 
 try:
-    from langchain_core.messages import ToolMessage
     from langgraph.checkpoint.memory import MemorySaver
     from langgraph.prebuilt import create_react_agent
 
@@ -198,7 +197,7 @@ class LangGraphAgentAdapter(BaseAgentAdapter):
             )
             raise
 
-    def create_agent_executor(self, tools: Optional[List[BaseTool]] = None) -> None:
+    def create_agent_executor(self, tools: Optional[List[Union[BaseTool, dict]]] = None) -> None:
         """Configure the LangGraph agent for execution."""
         self.configure_tools(tools)
 
@@ -206,7 +205,8 @@ class LangGraphAgentAdapter(BaseAgentAdapter):
         """Configure tools for the LangGraph agent."""
         if tools:
             base_tools = [tool for tool in tools if isinstance(tool, BaseTool)]
-            all_tools = list(self.tools or []) + list(base_tools or [])
+            existing_base_tools = [tool for tool in (self.tools or []) if isinstance(tool, BaseTool)]
+            all_tools = existing_base_tools + base_tools
             if all_tools:
                 self._tool_adapter.configure_tools(all_tools)
             available_tools = self._tool_adapter.tools()

src/crewai/utilities/tool_utils.py

@@ -53,10 +53,11 @@ def execute_tool_and_check_finality(
                         except Exception as e:
                             raise ValueError(f"Failed to set fingerprint: {e}")
 
-        # Create tool usage instance
+        # Create tool usage instance - filter to only executable tools for ToolUsage
+        executable_tools_for_usage = [tool for tool in tools if hasattr(tool, 'name') and hasattr(tool, 'result_as_answer')]
         tool_usage = ToolUsage(
             tools_handler=tools_handler,
-            tools=tools,
+            tools=executable_tools_for_usage,
             function_calling_llm=function_calling_llm,
             task=task,
             agent=agent,