registry = HookRegistry()
    runner = HookRunner(registry)
    
    # Execute hooks for an event
    results = await runner.execute(
        event=HookEvent.BEFORE_TOOL,
        input_data=BeforeToolInput(
            tool_name="write_file",
            tool_input={"path": "/tmp/test.txt"}
        )
    )
    
    # Check if any hook blocked
    if runner.is_blocked(results):
        print("Tool execution blocked by hook")