Improve tooling docs

src/crewai/cli/templates/pipeline_router/tools/custom_tool.py

@@ -1,11 +1,17 @@
+from typing import Type
 from crewai_tools import BaseTool
+from pydantic import BaseModel, Field
 
+class MyCustomToolInput(BaseModel):
+    """Input schema for MyCustomTool."""
+    argument: str = Field(..., description="Description of the argument.")
 
 class MyCustomTool(BaseTool):
     name: str = "Name of my tool"
     description: str = (
         "Clear description for what this tool is useful for, you agent will need this information to use it."
     )
+    args_schema: Type[BaseModel] = MyCustomToolInput
 
     def _run(self, argument: str) -> str:
         # Implementation goes here