MCP Server

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GustWeb includes a built-in MCP server that gives your LLM access to Gust's core features, including listing DAGs, triggering runs, exploring DAG definitions, and debugging executions.

To mount it in your Phoenix router:

import GustWeb.MCPRouter

scope "/mcp", MyAppWeb do
  pipe_through :api
  gust_mcp_server()
end

The prefix comes from your MyAppWeb router scope, so you can also mount it under a project-specific path to avoid clashes:

scope "/gust/mcp", MyAppWeb do
  pipe_through :api
  gust_mcp_server()
end

That would expose POST /gust/mcp/server. Keep auth and any app-specific policy outside the macro, at the router scope or pipeline level.

Connect to an MCP client

  • claude: claude mcp add --transport http gust-mcp http://localhost:4000/gust/mcp/server
  • codex: codex mcp add gust-mcp --url http://localhost:4000/gust/mcp/server

Skills

Install:

gh skill install marciok/gust elixir-dag-creator