Crash on exiting aider

[avneeshs1]

Issue

I am consistently seeing aider crash when I /exit out of it. The easiest way for me to reproduce this is to start aider and then /exit immediately. I give the following error:

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───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
Cost estimates may be inaccurate when using streaming and caching.
Aider v0.88.14
Main model: gpt-5 with agent edit format, reasoning medium
Weak model: gpt-5-nano
Git repo: ../macro/.git/worktrees/macro-PMSAX-72.ds with 680 files
Repo-map: using 4096 tokens, files refresh
MCP servers configured: dagster-docs-mcp, local_tools
Multiline mode: Enabled. Enter inserts newline, Alt-Enter submits text
───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
Readonly: .continue/rules/01-project.md .continue/rules/02-mcp.md                                                                                                  
agent multi> /exit                                                                                                                                                 
───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
Readonly: .continue/rules/01-project.md .continue/rules/02-mcp.md                                                                                                  
agent multi>                                                                                                                                                       
ERROR:asyncio:an error occurred during closing of asynchronous generator <async_generator object stdio_client at 0xffff9857c190>
asyncgen: <async_generator object stdio_client at 0xffff9857c190>
  + Exception Group Traceback (most recent call last):
  |   File "/home/avneesh.saxena/.local/share/uv/tools/aider-ce/lib/python3.12/site-packages/anyio/_backends/_asyncio.py", line 781, in __aexit__
  |     raise BaseExceptionGroup(
  | BaseExceptionGroup: unhandled errors in a TaskGroup (1 sub-exception)
  +-+---------------- 1 ----------------
    | Traceback (most recent call last):
    |   File "/home/avneesh.saxena/.local/share/uv/tools/aider-ce/lib/python3.12/site-packages/mcp/client/stdio/__init__.py", line 189, in stdio_client
    |     yield read_stream, write_stream
    | GeneratorExit
    +------------------------------------

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/avneesh.saxena/.local/share/uv/tools/aider-ce/lib/python3.12/site-packages/mcp/client/stdio/__init__.py", line 183, in stdio_client
    anyio.create_task_group() as tg,
    ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/avneesh.saxena/.local/share/uv/tools/aider-ce/lib/python3.12/site-packages/anyio/_backends/_asyncio.py", line 787, in __aexit__
    if self.cancel_scope.__exit__(type(exc), exc, exc.__traceback__):
       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/avneesh.saxena/.local/share/uv/tools/aider-ce/lib/python3.12/site-packages/anyio/_backends/_asyncio.py", line 459, in __exit__
    raise RuntimeError(
RuntimeError: Attempted to exit cancel scope in a different task than it was entered in

Version and model info

Aider v0.88.14

[dwash96]

Yeah, it's not so much crashing as much as I don't know how the mcp python sdk is meant to be exited. It definitely still exits, it just ungracefully stops the mcp server coroutines in the running back ground