feat: add TypedDict for tool arguments

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

src/crewai/tools/tool_calling.py

@@ -1,13 +1,22 @@
-from typing import Any, Dict, Optional
+from typing import Any, Dict, Optional, TypedDict
 
 from pydantic import BaseModel, Field
 from pydantic import BaseModel as PydanticBaseModel
 from pydantic import Field as PydanticField
 
 
+class ToolArguments(TypedDict, total=False):
+    """Arguments that can be passed to a tool.
+    
+    Set total=False to make all fields optional, which maintains backward
+    compatibility with existing tools that may not use all arguments.
+    """
+    question: str
+
+
 class ToolCalling(BaseModel):
     tool_name: str = Field(..., description="The name of the tool to be called.")
-    arguments: Optional[Dict[str, Any]] = Field(
+    arguments: Optional[ToolArguments] = Field(
         ..., description="A dictionary of arguments to be passed to the tool."
     )
 
@@ -16,6 +25,6 @@ class InstructorToolCalling(PydanticBaseModel):
     tool_name: str = PydanticField(
         ..., description="The name of the tool to be called."
     )
-    arguments: Optional[Dict[str, Any]] = PydanticField(
+    arguments: Optional[ToolArguments] = PydanticField(
         ..., description="A dictionary of arguments to be passed to the tool."
     )