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Agent enters infinite loop in plan mode when attempting to write plan #12306
Description
Description
When using gpt-5.2-codex xhigh, the agent appears to enter an infinite loop when attempting to create the final plan file:
When interrupted and manually put into build mode to give write access, it complained about the lack of a write tool despite instructions, and used apply_patch instead:
After letting the agent write the plan file and putting it into plan mode again, the agent will successfully proceed with the plan by using the exit_plan tool.
Plugins
None
OpenCode version
1.1.51-11a93a1 (beta branch)
Steps to reproduce
- Put OpenCode in plan mode
- Ask the agent to plan a feature
- Watch it enter infinite loop
Screenshot and/or share link
Company-internal repo, so I can't share unfortunately. Screenshots are above.
Operating System
Gentoo Linux amd64
Terminal
Ghostty 1.2.3
Activity
github-actions commentedon Feb 5, 2026
This issue might be a duplicate of existing issues. Please check:
.opencode/plans/#11078: plan mode: unwilling to write to.opencode/plans/Feel free to ignore if none of these address your specific case.
sin-ack commentedon Feb 5, 2026
Seems like #10883 and #11078 are the same issue, closing in favor of them.