MCP Language Server

](https://github.com/isaacphi/mcp-language-server/actions/workflows/go.yml) [ ](https://pkg.go.dev/github.com/isaacphi/mcp-language-server) [

This is an MCP server that runs and exposes a language server to LLMs. Not a language server for MCP, whatever that would be.

Demo

mcp-language-server helps MCP enabled clients navigate codebases more easily by giving them access semantic tools like get definition, references, rename, and diagnostics.

Setup

1. 1.Install Go: Follow instructions at
2. 2.Install or update this server: go install github.com/isaacphi/mcp-language-server@latest
3. 3.Install a language server: _follow one of the guides below_
4. 4.Configure your MCP client: _follow one of the guides below_

Go (gopls)

Install gopls: go install golang.org/x/tools/gopls@latest Configure your MCP client: This will be different but similar for each client. For Claude Desktop, add the following to ~/Library/Application\ Support/Claude/claude_desktop_config.json

{ "mcpServers": { "language-server": { "command": "mcp-language-server", "args": ["--workspace", "/Users/you/dev/yourproject/", "--lsp", "gopls"], "env": { "PATH": "/opt/homebrew/bin:/Users/you/go/bin", "GOPATH": "/users/you/go", "GOCACHE": "/users/you/Library/Caches/go-build", "GOMODCACHE": "/Users/you/go/pkg/mod" } } } }

Note: Not all clients will need these environment variables. For Claude Desktop you will need to update the environment variables above based on your machine and username:

PATH needs to contain the path to go and to gopls. Get this with echo $(which go):$(which gopls) GOPATH, GOCACHE, and GOMODCACHE may be different on your machine. These are the defaults.

Rust (rust-analyzer)

Install rust-analyzer: rustup component add rust-analyzer Configure your MCP client: This will be different but similar for each client. For Claude Desktop, add the following to ~/Library/Application\ Support/Claude/claude_desktop_config.json

{ "mcpServers": { "language-server": { "command": "mcp-language-server", "args": [ "--workspace", "/Users/you/dev/yourproject/", "--lsp", "rust-analyzer" ] } } }

Python (pyright)

Install pyright: npm install -g pyright Configure your MCP client: This will be different but similar for each client. For Claude Desktop, add the following to ~/Library/Application\ Support/Claude/claude_desktop_config.json