codex - 💡(How to fix) Fix Codex Desktop regression: slash/local skill chip submission hangs, errors, and duplicates messages on Windows after GPT-5.5 update [1 comments, 2 participants]

What version of the Codex App are you using (From “About Codex” dialog)?

26.422.20832

What subscription do you have?

Plus

What platform is your computer?

Microsoft Windows NT 10.0.26200.0 x64

What issue are you seeing?

Summary

After the recent Codex Desktop update that introduced/updated GPT-5.5, messages containing slash commands or local skill chips became unreliable in Codex Desktop on Windows.

Before the update, slash/local skill commands like openspec-review submitted and started seamlessly. Now they often show Error submitting message, sit on Thinking for a long time, and sometimes duplicate the same user message bubble before eventually starting execution.

This appears to happen before the agent actually begins work, so it looks like a desktop app submission/context-packaging/retry regression rather than a model or repo-task issue.

Environment

• App: Codex Desktop
• OS: Windows
• Shell: PowerShell
• Workspace: large local repo with repo-local skills/plugins
• Model/update context: started after recent Codex Desktop upgrade that came with GPT-5.5
• Time zone: Africa/Lagos
• Approx observed date: April 24, 2026

What steps can reproduce the bug?

Repro Steps

1. Open Codex Desktop in a large local coding workspace.
2. Submit a message containing a local skill/slash command chip, for example: commit + openspec-review
3. Observe one or more of:
   • Error submitting message
   • long delay on Thinking
   • same submitted message appears multiple times
   • eventual execution starts after a delay
4. Plain text messages appear less affected; slash/local skill chips are the consistent trigger.

What is the expected behavior?

Expected Behavior

A message containing a slash/local skill chip should submit once, resolve the skill, and begin model execution promptly, as it did before the recent desktop update.

Actual Behavior

The UI sometimes reports Error submitting message, delays for a long time, duplicates the same submitted bubble, and then may eventually execute.

Why This Seems App-Side

• The failure text is Error submitting message, before useful agent work starts.
• The task eventually runs correctly once submission succeeds.
• The issue is correlated with slash/local skill chip submission.
• It began immediately after a Codex Desktop upgrade.
• The same workspace and workflow were previously seamless.

Additional information

Relevant Local Skill

Example skill used:

openspec-review

Path:

C:\Users\Didi\Documents\Projects\VigilAfrica\vigilafrica\.agents\skills\openspec-review\SKILL.md

Skill workflow reads:

• .agents/workflows/openspec-review.md
• openspec/proposals/chore-frontend-tests.md
• openspec/specs/chore-frontend-tests.md
• Task.md
• docs/standards/developers-react.md

The repo has many available skills/plugins, so this may be related to large skill/tool context packaging.

Attachments

• Screenshot showing:
  • Error submitting message
  • repeated commit + openspec-review bubbles
  • delayed Thinking / Working for 11s

Possible Regression Areas

• Local skill chip resolution
• Slash command submission path
• Large context/tool/skill manifest packaging
• Retry/deduplication after failed submission
• Windows Codex Desktop app message queue

<img width="1030" height="527" alt="Image" src="https://github.com/user-attachments/assets/ae528885-57ed-4b3d-82d6-c5e6f1fa063b" />