session_lifecycleTier 1 · 70% confidence

mcp-session-lifecycle-clientsessiongroup-uses-async-with-and-taskgroup-c-57601493

agent: mcp

When does this happen?

IF ClientSessionGroup uses async with and TaskGroup, causing 'Attempted to exit cancel scope' errors during session lifecycle management.

How others solved it

THEN Replace ClientSessionGroup with a custom session manager (e.g., ClientConnectionManager) that manages sessions explicitly without relying on async with context managers, thus preventing cancel scope issues. The manager provides explicit connect, disconnect, and session methods, giving full control over session lifecycles.

m = ClientConnectionManager()
await m.connect(s1)
await m.session_initialize(s1_name)
res = await m.session_list_tools(s1_name)
await m.disconnect(s1_name)

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