From today, my vscode codex keep showing me this error…any help? @OpenAI_Support
I had ChatGPT transcibe the image with the error message to text so that the error messages could be indexed by search engines and AI.
Codex process errored: Codex app-server process exited unexpectedly (code=unknown, signal=SIGTRAP). Last CLI error:
2026-06-22T13:00:42.899847Z ERROR codex_core::util: Custom tool call output is missing for call_id: call_hFnQr97StX2UOgIRwf8ucvTo
2026-06-22T13:00:42.899904Z ERROR codex_core::util: Custom tool call output is missing for call_id: call_658f1F71suHacxs3RxTCtuUN
2026-06-22T13:00:42.899847Z ERROR codex_core::util: Custom tool call output is missing for call_id: call_hFnQr97StX2UOgIRwf8ucvTo
2026-06-22T13:00:42.899904Z ERROR codex_core::util: Custom tool call output is missing for call_id: call_658f1F71suHacxs3RxTCtuUN
Codex process errored: Codex app-server process exited unexpectedly (code=unknown,
signal=SIGTRAP). Last CLI error:
codex_memories_write::phase2: Phase 2 no changes
codex_memories_write::phase2: Phase 2 no changes
You are welcome to discuss Codex issues on the forum, however the official place to report and track them is the GitHub issue tracker for OpenAI Codex.
I searched ChatGPT for “Codex app-server process exited unexpectedly (code=unknown, signal=SIGTRAP).” and found
If that issue matches your problem, consider adding a 
reaction on the GitHub issue page itself, not just on the forum topic, as reactions on GitHub help the developers gauge impact and prioritize work.
If it is not the same issue, try searching the existing GitHub issues for a closer match. If you cannot find one, then open a new issue with as much detail as possible.
Thanks, Eric.
I think although the error msg seems to be a bit different but might be the same issue. Looked through some linked issues and seems that downgrading the Codex VS Code extension to version 26.609.30741 is the workaround at the moment.
hey, im experiencing the same problem, im a total newbie here. Was wondering how do i downgrade my vs code to that version?
Excellent question!
I even asked ChatGPT that question and while it gave a correct sequence of steps up to the point I could test at the moment, there are a few variations of steps to be aware. ChatGPT only gave the sequence via the Gear
Here are the steps
- Open VS Code.
- Go to Extensions:
Ctrl+Shift+X. - Search for Codex.
- Select Codex – OpenAI’s coding agent.
Use one of the two: Sequence A or Sequence B
Sequence A
- Click the Uninstall dropdown
- Click Install Specific Version… from the list of options
Sequence B
- Click the gear icon
- Click Install Specific Version… from the list of options
Note: At this point I can not test the sequence as I have a task running in another VS Code project that would halt because changing Codex requires a restart of the extension.
Continue here after doing Sequence A or Sequence B
- Pick the earlier version you want.
- Reload VS Code when prompted.
After that, disable auto-update or VS Code may update it again.
it worked!! thank you so much! Would love to get you a beer!
Honestly, letting me and others here know that something we suggested helped is more than enough. Glad it worked, and thanks for following up.
Stick around and help someone in the future if you can! 
Glad you got it sorted. We do have a great community here, though!