CLI violates instructions by ignoring mandatory Microsoft cpp language server (LSP) usage
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Descripción
### Describe the bug
Copilot CLI used grep/glob/raw search even though:
LSP was available
LSP would clearly have been sufficient
The model did not check for LSP availability
The model acknowledged the rule but still violated it.
[lsp_diagnostic_log_2026-05-25_16-06-45.zip](https://github.com/user-attachments/files/28224349/lsp_diagnostic_log_2026-05-25_16-06-45.zip)
Note 1: I'm using the cpp language server (https://github.com/microsoft/cpp-language-server).
Note 2: I've tried with many models (GPT-5 mini, Claude Sonnet 4.6, Claude Opus 4.6), but the output was always the same
### Affected version
GitHub Copilot CLI 1.0.54.
### Steps to reproduce the behavior
[lsp_diagnostic_log_2026-05-25_16-06-45.txt](https://github.com/user-attachments/files/28224382/lsp_diagnostic_log_2026-05-25_16-06-45.txt)
### Expected behavior
Follow instructions from \.github\instructions.md
### Additional context
_No response_
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