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claude-code - 💡(How to fix) Fix [BUG] LSP: Claude does not set client name in the initialize request [1 participants]

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anthropics/claude-code#45345•Fetched 2026-04-09 08:07:29
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Error Message

Error Messages/Logs

Root Cause

When I start an LSP session with Claude, it doesn't set the client name or the client version. This makes it hard to debug LSP issues, because I can't look at LSP logs to tell which requests were from Claude versus (for example) VS Code.

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Preflight Checklist

  • I have searched existing issues and this hasn't been reported yet
  • This is a single bug report (please file separate reports for different bugs)
  • I am using the latest version of Claude Code

What's Wrong?

LSP allows you to specify a client name when you send the initialize request: https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#initialize

When I start an LSP session with Claude, it doesn't set the client name or the client version. This makes it hard to debug LSP issues, because I can't look at LSP logs to tell which requests were from Claude versus (for example) VS Code.

What Should Happen?

Claude should set both the client name and version in the initialize request.

Error Messages/Logs

Steps to Reproduce

  1. Start Claude in a Rust project in an environment with the rust toolchain installed (which provides rust-analyzer, the Rust LSP).
  2. Enable LSP in the current Claude session.
  3. View LSP logs and observe that the client name isn't set.

Claude Model

None

Is this a regression?

No, this never worked

Last Working Version

No response

Claude Code Version

2.1.96 (Claude Code)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

iTerm2

Additional Information

No response

extent analysis

TL;DR

Modify the Claude Code to include the client name and version in the LSP initialize request.

Guidance

  • Review the LSP specification to ensure compliance with the initialize request format: https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#initialize
  • Update the Claude Code to set the client name and version in the initialize request, potentially by modifying the code that constructs the request
  • Verify the fix by checking the LSP logs for the client name and version after starting a new LSP session with Claude
  • Consider adding logging or debugging statements to the Claude Code to facilitate troubleshooting of LSP issues

Example

No code snippet is provided due to lack of specific code context in the issue.

Notes

The fix may require modifications to the Claude Code's LSP implementation, and the exact changes will depend on the code's structure and organization.

Recommendation

Apply workaround: Modify the Claude Code to include the client name and version in the LSP initialize request, as this is a necessary fix to enable proper debugging of LSP issues.

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claude-code - 💡(How to fix) Fix [BUG] LSP: Claude does not set client name in the initialize request [1 participants]