GenMCP

MCP server building blocks for Elixir.

This library packs two main features:

• GenMCP itself - a low level behaviour to implement your own MCP server logic.
• GenMCP.Suite - a high level suite of components to build tools, resources and prompts with the default server implementation.

Installation

The usual tuple for mix.exs!

defp deps do
  [
    {:gen_mcp, "~> 1.0"},
  ]
end

Documentation

On hexdocs.pm.

Supported Features

• Streamable http transport
• Session initialization with distributed Erlang supprt
• Tool calling with support for concurrency execution (Task or custom processes)
• Tools listing (no pagination)
• Resources (with pagination)
• Prompts (with pagination)
• Session storage and restoration

Roadmap

• Session timeouts handled by custom code
• Server requests (elicitation, sampling and roots)
• Stdio transport and burrito wrapping tools
• Messages resumability
• Resources subscription