Codex tool IPC decoding failure
Nobody has claimed this yet.
- Dominant language
- Rust
- Stars
- 125k
- Forks
- 19.4k
- PR merge metrics
- PR metrics pending
Description
What version of the Codex App are you using (From “About Codex” dialog)?
26.901.51231
What subscription do you have?
enterprise
What platform is your computer?
Linux 6.12.94+ x86_64 x86_64
What issue are you seeing?
Every tool invocation fails with:
failed to decode code-mode IPC frame: unknown field code_mode_host_duration_ns, expected one of cell_id, content_items, error_text
Reproduced using the simple command pwd. The issue persisted after downloading/reinstalling Codex Desktop. Please check for a client/tool-host protocol version mismatch.
What steps can reproduce the bug?
Feedback ID: 01a08304-c3d7-7903-90cc-bb651e268c2a
What is the expected behavior?
No response
Additional information
only happens with 5.6 models, reverting to 5.5 makes codex operational. also impacts CLI as well
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Reproduce the failure with the simple pwd command on Linux using a 5.6 model, then compare the client and tool-host IPC behavior with 5.5, which works. Use the reported decoding error and feedback ID 01a08304-c3d7-7903-90cc-bb651e268c2a to trace the version mismatch across Codex Desktop and CLI; done when tool invocations decode successfully on 5.6.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- rust
- Domain
- cli, desktop
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Active
- Clarity
- Needs clarification
- Newbie friendliness
- 35/100