Agents misinterpret LSP diagnostics as failed edits #9102

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1. github-actions

   assigned

   thdxr

   on Jan 17, 2026
2. github-actions commented on Jan 17, 2026

   

   github-actionsBot

   on Jan 17, 2026 – with GitHub Actions

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   This issue might be a duplicate of existing issues. Please check:

   • Sessions become unusable due to large LSP diagnostics (Lua + possibly others) #6310: Sessions become unusable due to large LSP diagnostics (Lua + possibly others) - Similar problem where LSP diagnostics are causing issues with tool operations
   • File edits not applied - shows diff output only without modifying files #3902: File edits not applied - shows diff output only without modifying files - Shows similar symptom where edit operations appear to fail but may actually succeed
   • write and edit tools return spurious 'cmd must not be empty' error despite successful operations #2255: write and edit tools return spurious 'cmd must not be empty' error despite successful operations - Related issue where operations succeed but errors are shown, causing agents to misinterpret results

   Feel free to ignore if none of these address your specific case.
3. pschiel commented on Jan 17, 2026

   

   pschiel

   on Jan 17, 2026

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   It sounds a bit like a bad model issue. Had zero problems with that. Tool calls show clearly successful, agent interprets the type errors correctly, also understands when it's not due to that edit. What model are you using?
4. Lyapsus commented on Jan 17, 2026

   

   Lyapsus

   on Jan 17, 2026

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   Don't have transcripts at hand but I'm pretty sure Gemini 3 Pro and Codex 5.2 both at max thinking levels showed such behavior.
   And even if this is a matter of weak model - why not help it? This case is a free lunch to me in this regard

   👍React with 👍2Reacted by Patrick Schiel and Aaron Kemp
5. github-actions commented on Mar 27, 2026

   

   github-actionsBot

   on Mar 27, 2026 – with GitHub Actions

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   To stay organized issues are automatically closed after 90 days of no activity. If the issue is still relevant please open a new one.
6. github-actions

   closed this as completedon Mar 27, 2026
7. SMARK2022

   added a commit that references this issue on Jul 9, 2026

   feat(lsp): 默认启用 LSP + 增量诊断 + VSCode Bridge LSP Backend + TUI 诊断渲染增强

   ...

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