Codex keeps forgetting to use Serena MCP after a while.
Resolved 💬 9 comments Opened Nov 2, 2025 by aseelye Closed Dec 25, 2025
💡 Likely answer: A maintainer (github-actions[bot], contributor)
responded on this thread — see the highlighted reply below.
What version of Codex is running?
codex-cli 0.53.0
What subscription do you have?
Pro
Which model were you using?
gpt-5-codex (reasoning high, summaries auto)
What platform is your computer?
Darwin 24.6.0 arm64 arm
What issue are you seeing?
Codex, after some time or in the middle of a long run, will forget to use Serena MCP for file functions. It's good about using Serena for searching for strings, but doing reads and especially writes, it'll fall back to direct manipulation. Interrupting it, and reminding it to use Serena will put it back on track.
What steps can reproduce the bug?
Uploaded thread: 019a452f-b1f5-7222-a4dc-554971280e0a
What is the expected behavior?
Not forgetting to use Serena.
Additional information
_No response_
9 Comments
Potential duplicates detected. Please review them and close your issue if it is a duplicate.
Powered by Codex Action
Another instance of this behavior with thread ID 019a452f-b1f5-7222-a4dc-554971280e0a
Another instance with thread ID 019a452f-b1f5-7222-a4dc-554971280e0a (updated)
Another instance with thread ID 019a459d-ddfb-7531-8183-145381fa9ad6
Another instance with thread ID 019a46ca-8e3b-7b43-ba56-358870e8b15f
Another instance with thread ID 019a47ba-803f-7561-838b-ebddc861bab4
Another instance with thread ID 019a4eec-abb2-7243-b811-9ca9ffdf2838
Another instance with thread ID 019a654d-0a9c-7141-a3d9-a862d98fa20f
I think this issue is stale and likely no longer relevant. Closing.