Which language servers are supported?
Tested with pyright (Python), tsserver (TypeScript), gopls (Go), and rust-analyzer (Rust), but it should be compatible with many more.
MCP Language Server
@MCP-Mirror
Basic information
About MCP Language Server
Mirror of
MCP Language Server config
No standard config provided
This server doesn't expose a parseable MCP config block in its README. See the repository for install instructions.
RepositoryMCP Language Server tools
6Retrieves the complete source code definition of any symbol (function, type, constant, etc.) from your codebase.
Locates all usages and references of a symbol throughout the codebase.
Provides diagnostic information for a specific file, including warnings and errors.
Retrieves code lens hints for additional context and actions on your code.
Runs a code lens action.
Allows making multiple text edits to a file programmatically.
Overview
What is MCP Language Server?
MCP Language Server is a Model Context Protocol server that runs a language server and provides tools for communicating with it, enabling LLMs to precisely understand types, relationships, and symbol references in large codebases.
How to use MCP Language Server?
Install Go and a language server (e.g., pyright, tsserver, gopls, rust-analyzer). Fetch the server with go install github.com/isaacphi/mcp-language-server@latest. Configure your MCP client (e.g., Claude Desktop) with a JSON entry specifying the go command, --workspace, --lsp, and any language server arguments after --.
Key features of MCP Language Server
- Retrieves complete source code definitions of any symbol.
- Locates all usages and references of a symbol.
- Provides diagnostic warnings and errors for files.
- Retrieves and executes code lens hints.
- Applies multiple text edits to files programmatically.
- Handles
workspace/applyEditrequests from the language server.
Use cases of MCP Language Server
- Letting an LLM navigate and edit a large codebase with accurate symbol understanding.
- Automating refactoring operations that require precise type and reference knowledge.
- Integrating language server capabilities (diagnostics, code lens) into MCP‑based workflows.
- Enabling LLMs to add imports, format code, or apply other LSP‑driven edits.
Frequently asked questions
What are the runtime dependencies?
Go must be installed. You also need to install a language server for your codebase (e.g., via npm, go install, or rustup).
Where does my data live?
All operations run locally on your machine; the server accesses files in your specified workspace directory and communicates with the local language server via stdio.
What are the current limitations?
The project is pre‑beta quality. Not all LSP features are implemented; missing items include hover info and code actions. Context/cancellation handling and configuration options are still being improved.
How does the server communicate with the client?
MCP Language Server uses the MCP protocol over stdio. It leverages `mcp-golang` for MCP communication and edited code from `gopls` for LSP protocol handling.
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