Simple chatbot: consider removing cleanup lock from sequential lifecycle
维护者通常 1 天内回复
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调研方向
从 examples/clients/simple-chatbot/mcp_simple_chatbot/main.py 开始，沿着 issue 中描述的清理调用路径进行追踪。在移除锁之前，向维护者确认是否应支持演示流程之外的并发调用方。完成标准是：移除锁，同时保留现有的清理主体和错误处理；或者添加注释，说明预期的并发使用场景。
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描述
While studying the simple chatbot's context-management lifecycle, I found Server._cleanup_lock confusing because the example does not appear to invoke cleanup concurrently on the same Server.
Source: examples/clients/simple-chatbot/mcp_simple_chatbot/main.py.
The current call paths are sequential:
Server.initialize()awaitsself.cleanup()on initialization failure before re-raising.ChatSession.start()awaitscleanup_servers()in its initialization-error handler and again in itsfinallyblock.cleanup_servers()awaits each server's cleanup in reverse server order.
Repeated cleanup calls therefore do not overlap in the demonstrated flow. A single AsyncExitStack.aclose() already awaits the registered exits sequentially in reverse order, so the lock is not needed to make session teardown precede transport teardown.
Suggested simplification: remove the _cleanup_lock initialization and the async with self._cleanup_lock: wrapper, retaining the existing cleanup body and error handling. Alternatively, a brief comment explaining an intended concurrent-caller use case would clarify why the lock is retained.
This is an example-code clarity/simplification request based on source inspection, not an observed runtime bug or a claim that locks are unnecessary for concurrent cleanup generally. Removing it would remove serialization for callers that use this class concurrently outside the demonstrated flow; that tradeoff needs maintainer judgment. No runtime tests were performed for this report.
Reporting first per the contribution guide. AI assistance: prepared with OpenAI Codex after discussing the example and inspecting its cleanup call paths.
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