MCP Server

devenv mcp launches a Model Context Protocol (MCP) server that exposes devenv functionality to AI assistants.

Usage

Stdio mode (default)

$ devenv mcp

The server communicates over stdin/stdout. This is the mode used when an AI tool spawns devenv as a subprocess.

HTTP mode

$ devenv mcp --http
$ devenv mcp --http 9090

Starts the MCP server as an HTTP service. The default port is 8080.

Available tools

The MCP server provides:

• search_packages — search for packages in the nixpkgs input.
• search_options — search for devenv configuration options.

Integration with Claude Code

See Claude Code integration for instructions on configuring Claude Code to use the devenv MCP server automatically.