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devenv

MCP Server

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

Usage

Section titled “Usage”

Stdio mode (default)

Section titled “Stdio mode (default)”
Terminal window
$ devenv mcp

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

HTTP mode

Section titled “HTTP mode”
Terminal window
$ devenv mcp --http
$ devenv mcp --http 9090

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

Available tools

Section titled “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

Section titled “Integration with Claude Code”

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