Anubis MCP: Build MCP Tools in Elixir

Today I discovered Anubis MCP, an excellent Elixir SDK for building Model Context Protocol (MCP) servers and clients.

What Makes It Special

Unlike most MCP implementations in Python/TypeScript, Anubis brings Elixir's concurrency model and fault tolerance to MCP. The API is incredibly clean:

defmodule MyApp.MCPServer do
  use Anubis.Server,
    name: "My Server",
    capabilities: [:tools]

  def handle_tool("echo", %{text: text}, frame) do
    {:reply, text, frame}
  end
end

Key Features

• Full client and server implementations
• Multiple transports: HTTP, SSE, streamable HTTP
• Schema validation with input_schema
• Phoenix and Plug integration
• Great docs and examples

The library cleverly uses Elixir's GenServer pattern for lifecycle management and supervision for fault tolerance. Perfect for building production-ready MCP tools!

Check out the documentation for more examples.