CSharpLspAdapter 1.0.1

CSharpLspAdapter

LSP adapter for csharp-ls that enables compatibility with Claude Code.

Why?

Claude Code's LSP client doesn't support several protocol methods that csharp-ls requires:

• workspace/configuration — server requests workspace settings
• client/registerCapability — dynamic capability registration
• window/workDoneProgress/create — progress reporting

Without this adapter, csharp-ls hangs waiting for responses that never come.

Architecture

Claude Code  ←→  csharp-ls-adapter  ←→  csharp-ls
                      ↓
               Intercepts and handles:
               - workspace/configuration
               - client/registerCapability
               - window/workDoneProgress/create

Installation

Prerequisites

• .NET SDK 8.0 or later
• csharp-ls language server

# Install csharp-ls
dotnet tool install --global csharp-ls

# Install the adapter
dotnet tool install --global CSharpLspAdapter

Configure Claude Code

Add to your ~/.claude/settings.json:

{
  "lspServers": {
    "csharp": {
      "command": "csharp-ls-adapter",
      "languages": ["csharp"]
    }
  }
}

Or with environment variables:

{
  "lspServers": {
    "csharp": {
      "command": "csharp-ls-adapter",
      "languages": ["csharp"],
      "env": {
        "LSP_SOLUTION_PATH": "/path/to/your/Solution.sln",
        "LSP_ADAPTER_DEBUG": "1"
      }
    }
  }
}

Configuration

Supported LSP Features

• Go to Definition
• Find References
• Hover Documentation
• Document Symbols
• Workspace Symbols
• Diagnostics
• Code Actions
• Signature Help
• Completion

Building from Source

git clone https://github.com/agasper/CSharpLspAdapter.git
cd CSharpLspAdapter
dotnet pack -c Release
dotnet tool install --global --add-source ./bin/Release CSharpLspAdapter

Related Issues

• Claude Code #16360 — Missing LSP protocol handlers

License

MIT