src/agents/lifecycle.py [33:54]:
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    ) -> None:
        """Called when a handoff occurs."""
        pass

    async def on_tool_start(
        self,
        context: RunContextWrapper[TContext],
        agent: Agent[TContext],
        tool: Tool,
    ) -> None:
        """Called before a tool is invoked."""
        pass

    async def on_tool_end(
        self,
        context: RunContextWrapper[TContext],
        agent: Agent[TContext],
        tool: Tool,
        result: str,
    ) -> None:
        """Called after a tool is invoked."""
        pass
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -