Serve the Belay MCP server over stdio against a Postgres database:
mix belay.mcp --url postgres://user:pass@host:5432/my_appThe URL may also come from the BELAY_URL environment variable. Add it to
an MCP client config to let AI assistants inspect queues, jobs, steps, and
events. Mutation tools are read-only by default; pass --authorizer MyGuard
for policy-gated writes or --allow-mutations to opt in explicitly.