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Codex in experimental plan mode create the plan file twice #10121
Description
Description
Codex models are equipped with the apply_patch tool, not able to use the write tool, and when in the experimental plan mode, it will first create the plan file using apply_patch but found itself violated instructions to mandate the write tool, then delete and recreate the same plan file.
Its thinking often shows something like:
Thinking: Correcting file creation to use write tool
The initial plan file was created with apply_patch, but instructions mandate using the write tool in plan mode, so I'll rewrite the file with the write tool.
Thinking: Confirming only patch-based file writes
The available tools lack a direct write or edit command, so file modifications must use apply_patch despite system reminders mentioning write. I'll continue using apply_patch for file changes.
Plugins
No response
OpenCode version
1.1.32
Steps to reproduce
- Enable the experimental plan mode.
- Select GPT Codex 5.2 with plan mode.
- Ask to create a plan.
- Observe the agent try to create the plan file twice.
Screenshot and/or share link
No response
Operating System
Windows 11
Terminal
Windows Terminal
Activity
github-actions commentedon Jan 23, 2026
This issue might be a duplicate of existing issues. Please check:
planagent runs amock and starts writing #10057:planagent runs amock and starts writing - related issue where the plan agent is making unexpected changes and creating files twiceFeel free to ignore if none of these address your specific case.
github-actions commentedon Mar 26, 2026
To stay organized issues are automatically closed after 90 days of no activity. If the issue is still relevant please open a new one.