Modern DSL for defining MCP server primitives next to their handlers.

Use this module with ExMCP.Server.Handler:

defmodule MyServer do
  use ExMCP.Server.Handler
  use ExMCP.Server.DSL

  tool "echo", "Echo back the input" do
    param :message, :string, required: true

    run fn %{message: message}, _state ->
      {:ok, %{text: message}}
    end
  end
end