LSP-MCP Bridge

lsp-mcp-rs

MCP server that bridges to any LSP. One binary, multiple language servers.

Build

cargo build --release

Binary: target/release/lsp-mcp-rs.exe

Configure

Create config.toml next to the binary:

[servers.lua]
command = "C:/path/to/lua-language-server.exe"
args = ["--stdio"]
extensions = [".lua"]

[servers.rust]
command = "rust-analyzer"
args = []
extensions = [".rs"]

[servers.python]
command = "pyright-langserver"
args = ["--stdio"]
extensions = [".py"]

Add to Claude Desktop config (claude_desktop_config.json):

{
  "mcpServers": {
    "lsp": {
      "command": "X:\\path\\to\\lsp-mcp-rs.exe",
      "args": []
    }
  }
}

Tools

All position arguments are 0-indexed.

How it works

1. MCP request comes in with a file path
2. File extension maps to configured LSP server
3. LSP spawns on first use, stays running
4. Request forwarded to LSP, response returned via MCP

License

MIT

Authors

DC, KALIC, Stryk9190