Mcp Language Server

Name: Mcp Language Server
Author: isaacphi

pyright · by isaacphi

mcp-language-server gives MCP enabled clients access semantic tools like get definition, references, rename, and diagnostics.

1.6k 933.6k/wk 6 tools GitHub npm

No known CVEs

BSD-3-Clause license

Maintained

Last commit 123d ago

Works with most clients

Transport: stdio, sse, http

6 tools · ~336 tok

Grade A · 0.2% of 200K ctx

Edit this pageView history

Developer Tools

Step 1

Install in your client

Config is the same across clients — only the file and path differ.

Supported in Claude Desktopstdio, sse, http · Node 18+

Paste into ~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "language-server": {
      "env": {
        "LOG_LEVEL": "DEBUG"
      },
      "args": [
        "--workspace",
        "/path/to/workspace",
        "--lsp",
        "language-server-executable"
      ],
      "command": "/full/path/to/your/clone/mcp-language-server/mcp-language-server"
    }
  }
}

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[![MCPpedia Score](https://mcppedia.org/api/badge/mcp-language-server)](https://mcppedia.org/s/mcp-language-server)

Read me

What Mcp Language Server does

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

Test This Server

Run this in your terminal to verify the server starts. Then let us know if it worked — your result helps other developers.

npx -y 'pyright' 2>&1 | head -1 && echo "✓ Server started successfully"

After testing, let us know if it worked:

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Why this score

Five weighted categories — click any category to see the underlying evidence.

Score breakdown

87/100across 5 weighted dimensions

How we score →

0255075100

−13

Security

Maintenance

Efficiency

Documentation

Compatibility

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Security

OSV.dev

No known CVEs.

Checked pyright against OSV.dev.

Inventory

Tools (6)

Click any tool to inspect its schema.

~336 tokens total

Community

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How easy was setup?Did it work reliably?How was the documentation?

Frequently Asked Questions

Is Mcp Language Server safe to use?: Mcp Language Server has no known CVEs as of the latest MCPpedia security scan. It does not require authentication, so any local process can connect — keep this in mind in shared environments. Licensed under BSD-3-Clause.
How do I install Mcp Language Server?: Mcp Language Server supports copy-paste install configs on its MCPpedia page for Claude Desktop, Cursor, and Claude Code. Scroll to the Quick Install section and select your client.
What can Mcp Language Server do?: Mcp Language Server provides 6 tools: definition, references, diagnostics, hover, rename_symbol and 1 more. See the full tools list on the server page for descriptions and parameters.
What AI clients work with Mcp Language Server?: Mcp Language Server is compatible with claude-desktop, cursor, claude-code. It uses stdio and sse and http transport.
Is Mcp Language Server actively maintained?: Mcp Language Server is less actively maintained — last commit was 123 days ago. It has 1,562 GitHub stars.

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Community

Discussion

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Has anyone used this with Cursor?How do you handle auth?Any alternatives?

{ "mcpServers": { "language-server": { "env": { "LOG_LEVEL": "DEBUG" }, "args": [ "--workspace", "/path/to/workspace", "--lsp", "language-server-executable" ], "command": "/full/path/to/your/clone/mcp-language-server/mcp-language-server" } } }

Setup

Install Go: Follow instructions at https://golang.org/doc/install

Install or update this server: go install github.com/isaacphi/mcp-language-server@latest

Install a language server: follow one of the guides below

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

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

Frequently Asked Questions

Is Mcp Language Server safe to use?

Mcp Language Server has no known CVEs as of the latest MCPpedia security scan. It does not require authentication, so any local process can connect — keep this in mind in shared environments. Licensed under BSD-3-Clause.

How do I install Mcp Language Server?

Mcp Language Server supports copy-paste install configs on its MCPpedia page for Claude Desktop, Cursor, and Claude Code. Scroll to the Quick Install section and select your client.

What can Mcp Language Server do?

Mcp Language Server provides 6 tools: definition, references, diagnostics, hover, rename_symbol and 1 more. See the full tools list on the server page for descriptions and parameters.

What AI clients work with Mcp Language Server?

Mcp Language Server is compatible with claude-desktop, cursor, claude-code. It uses stdio and sse and http transport.

Is Mcp Language Server actively maintained?

Mcp Language Server is less actively maintained — last commit was 123 days ago. It has 1,562 GitHub stars.

Setup

Install Go: Follow instructions at https://golang.org/doc/install

Install or update this server: go install github.com/isaacphi/mcp-language-server@latest

Install a language server: follow one of the guides below

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

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

Mcp Language Server

Install in your client

What Mcp Language Server does

Test This Server

Why this score

87/100across 5 weighted dimensions

Security

Tools (6)

Reviews

Frequently Asked Questions

Similar servers

Discussion

Mcp Language Server

Install in your client

What Mcp Language Server does

Test This Server

MCP Language Server

Demo

Setup

Why this score

87/100across 5 weighted dimensions

Security

Tools (6)

Reviews

Frequently Asked Questions

Similar servers

Discussion

MCP Language Server

Demo

Setup