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mcp-language-server

isaacphi/mcp-language-server

Provides MCP enabled clients with semantic tools for code understanding and manipulation

GitHub

GraphCanon updated 3w · GitHub synced 3w

1.6k stars138 forksLast push 5mo Go BSD-3-Clause

Decision brief

The mcp-language-server offers MCP enabled clients access to functions such as get definition, references, rename, and diagnostics.

Good fit when

  • Use when working on projects that leverage the Model Context Protocol for enhanced code understanding and manipulation capabilities.
  • Select if your development environment supports or requires the Language Server Protocol, and you need features specific to MCP.

Avoid when

  • Avoid it if your workflow does not support or require the Model Context Protocol.
  • Do not use when working in environments that mandate using a language server not based on Go, since mcp-language-server is written in Go.

Observed Jul 16, 2026 · Source: enrich:decision_facts

mcp-language-server alternativesTrust report

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Maintenance and security

Full trust report
Maintenance
Slowing (147d since push)
As of 3w
Provenance
Not a fork · Personal account
As of 3w
Security (OSV)
No MCP manifest
As of 1mo

Public GitHub metadata and optional OSV scans. Signals, not a guarantee. Trust methodology.

Install

go get github.com/isaacphi/mcp-language-server
pkg.go.dev

Similar tools

Same-category neighbours. No typed graph edges are catalogued for this tool yet.

Evidence and technical details

Sourced facts, taxonomy, compatibility claims, README excerpt, and machine-readable endpoints.

Overview

The mcp-language-server is built in Go and supports functions such as get definition, references, rename, and diagnostics through the Model Context Protocol, adhering to the Language Server Protocol.

Capability facts

Languages
go

Source: github.language · Jul 27, 2026

Categories

Developer Tools

Compatibility

Sourced claims from the README excerpt - not unsourced marketing copy.

Node.js runtimeNode.js

Source: README excerpt (regex_v1, Jul 27, 2026)

<p><strong>Install pyright</strong>: <code>npm install -g pyright</code></p>
Source link
Python runtimePython

Source: README excerpt (regex_v1, Jul 27, 2026)

<summary>Python (pyright)</summary>
Source link
stdio transportstdio

Source: README excerpt (regex_v1, Jul 27, 2026)

"--stdio"
Source link

Tags

ailanguage-server-protocolmcpmodel-context-protocol

README

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. Install Go: Follow instructions at https://golang.org/doc/install
  2. Install or update this server: go install github.com/isaacphi/mcp-language-server@latest
  3. Install a language server: follow one of the guides below
  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

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

Install typescript-language-server: npm install -g typescript typescript-language-server

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",

For agents

This page has a .md twin and JSON over the API.

/tools/isaacphi-mcp-language-server.mdGET /api/graphcanon/tools/isaacphi-mcp-language-serverGET /api/graphcanon/graph?tool=isaacphi-mcp-language-server

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