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Implementation hallucinated in plan mode #2077
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When using plan mode with Claude Sonnet 4 (on a fairly simple task), the agent made a plan and hallucinated an implementation without realizing that it's in plan mode. Later when I switched it to build mode, it claimed that the implementation was already complete even though it didn't edit any files.
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github-actions commentedon Aug 19, 2025
This issue might be a duplicate of existing issues. Please check:
sedto edit files inplanmode - describes similar behavior where agents try to use tools to edit/fix files during planning stageFeel free to ignore if none of these address your specific case.
rekram1-node commentedon Aug 19, 2025
Thx for issue nikhil, Do you think this is basically same issue as #1965?
I have seen this happen a few times too
nikhilmaddirala commentedon Aug 21, 2025
Upon closer inspection, yes it's the same issue. It edited the file using cat >> file << 'EOF'.
But this was Claude Sonnet 4, and this never happens with claude code, so I think the issue is with opencode prompts.
Feel free to merge the issues.
rekram1-node commentedon Aug 21, 2025
Will do thx!