session_lifecycleTier 1 · 70% confidence

mcp-session-lifecycle-receiving-attempted-to-exit-cancel-scope-error-whe-9310959f

agent: mcp

When does this happen?

IF Receiving 'Attempted to exit cancel scope' error when managing multiple MCP sessions concurrently with ClientSessionGroup using async context managers.

How others solved it

THEN Replace ClientSessionGroup with a persistent session manager such as ClientConnectionManager that manages session lifecycle without relying on async with, allowing independent connect, initialize, list_tools, call_tool, and disconnect operations per session.

manager = ClientConnectionManager()
await manager.connect(s1_params)
await manager.connect(s2_params)
await manager.session_initialize('s1')
res = await manager.session_list_tools('s1')
await manager.disconnect('s1')

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