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MCP Language Server

Go MCP server that launches an existing stdio language server and exposes semantic code-navigation tools such as definitions, references, hover, diagnostics, symbol rename, and file edits.

by isaacphi·added 2026-06-05·
Claude CodeClaude Desktop
HarnessClaude CodeClaude Desktop
Review first — review before installing

Open the source and read safety notes before installing.

Safety notes

  • The server can expose write-capable tools such as symbol rename and structured file edits in addition to read-only navigation tools.
  • It launches the configured language server process with the provided workspace and environment, so review PATH, arguments, environment variables, and workspace scope.
  • Language servers may execute project-specific discovery, indexing, build-script, or plugin behavior depending on the ecosystem and configuration.
  • Keep manual review on rename and edit operations in large workspaces because a language server can change many references across a project.
  • The README describes the project as beta software; expect behavior and compatibility to evolve.

Privacy notes

  • Tool results can expose source code, definitions, references, hover text, diagnostics, file paths, module names, package names, build configuration, and generated edits.
  • Language-server logs, MCP client transcripts, model prompts, and debug output can retain proprietary code structure and project metadata.
  • Environment variables passed to the language server may include paths, cache locations, tokens, private registry settings, or build-system credentials.
  • Avoid connecting private workspaces to shared MCP clients or model providers without approval from the project owner.

Prerequisites

  • Go installed for building the `mcp-language-server` binary.
  • A stdio language server installed for the target language, such as gopls, rust-analyzer, pyright, typescript-language-server, or clangd.
  • A workspace path the agent is allowed to inspect and, if enabled, edit.
  • Language-server environment variables, PATH entries, caches, module paths, and compile-command directories configured for the target project.
  • Team agreement on whether symbol rename and file-edit tools may be used automatically.

Schema details

Install type
cli
Troubleshooting
No
Source repository stats
Scope
Source repo
Collection metadata
Estimated setup
15 minutes
Difficulty
intermediate
Full copyable content
{
  "mcpServers": {
    "language-server": {
      "command": "mcp-language-server",
      "args": ["--workspace", "WORKSPACE_PATH", "--lsp", "gopls"]
    }
  }
}

About this resource

Content

MCP Language Server is a Go MCP server that launches an existing stdio language server and exposes semantic code tools to MCP clients. Instead of relying only on text search, Claude can ask for definitions, references, diagnostics, hover information, symbol rename, and structured file edits from the language server that already understands the workspace.

The README includes setup examples for gopls, rust-analyzer, pyright, typescript-language-server, clangd, and other stdio language servers. It is a useful fit for coding-agent workflows where semantic navigation can reduce guesswork and avoid reading broad file ranges just to find symbols.

Source Review

These sources were reviewed on 2026-06-05. Prefer the live repository, README, license, attribution file, Go module metadata, entrypoint, tool implementation, and Go package documentation for current install and tool behavior.

Features

  • Launch a configured stdio language server for a workspace.
  • Retrieve source-code definitions for symbols.
  • Find references and usages across a project.
  • Get diagnostics for a file.
  • Display hover documentation or type information.
  • Rename symbols across a project.
  • Apply multiple structured text edits to a file.
  • Pass arguments after -- through to the language server.
  • Configure language-server environment variables through the MCP client.

Installation

Install the binary with Go:

go install github.com/isaacphi/mcp-language-server@latest

Install the language server for your project, then configure an MCP client:

{
  "mcpServers": {
    "language-server": {
      "command": "mcp-language-server",
      "args": ["--workspace", "WORKSPACE_PATH", "--lsp", "gopls"]
    }
  }
}

For language servers that require additional arguments, pass them after --.

Use Cases

  • Ask Claude for the definition of a function, type, or constant.
  • Find all references before changing a symbol.
  • Inspect diagnostics for a file without opening an IDE.
  • Retrieve hover documentation and type hints for unfamiliar APIs.
  • Rename a symbol with language-server awareness.
  • Apply structured edits when search-and-replace would be too brittle.
  • Use semantic navigation in large workspaces where text search is noisy.

Safety and Privacy

MCP Language Server exposes semantic access to a code workspace. Treat it like connecting an agent to your IDE's language intelligence and refactoring tools. Keep write operations reviewed, especially rename and edit tools that can affect many files.

The server launches the language server you configure. Review the binary, arguments, environment variables, workspace path, caches, and language-specific plugins before use. Tool output can include proprietary source code, file paths, diagnostics, type names, dependencies, and generated edits.

Duplicate Check

No isaacphi/mcp-language-server entry, MCP Language Server entry, or matching source URL was found in content/mcp.

#code#language-server#lsp#developer-tools#refactoring

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