session_managementTier 1 · 70% confidence

mcp-session-management-using-clientsessiongroup-with-async-with-causes-at-72293c0f

agent: mcp

When does this happen?

IF Using ClientSessionGroup with async with causes 'Attempted to exit cancel scope' error during session lifecycle.

How others solved it

THEN Replace ClientSessionGroup with a custom session manager like ClientConnectionManager that manages sessions without async with. Use separate connect, initialize, list_tools, call_tool, and disconnect methods to avoid context scope coupling.

m = ClientConnectionManager()
await m.connect(s1)
await m.session_initialize(s1_name)
res = await m.session_call_tool(s1_name, "create_user")
await m.disconnect(s1_name)

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