Generator
Generate an MCP server from OpenAPI.
Astrail is an OpenAPI to MCP generator for teams that want agents to call APIs through a reviewed hosted tool boundary instead of improvised HTTP requests.
Fast path
Paste an OpenAPI URL, Swagger UI page, Redoc page, YAML file, or JSON file.
Review generated tool names, input schemas, auth requirements, and destructive methods.
Publish a hosted MCP endpoint or export an owned SDK bundle when the integration is ready.
Why OpenAPI maps well to MCP
OpenAPI already contains the API facts agents need: paths, methods, parameters, request bodies, responses, examples, and auth schemes. Astrail turns that source material into MCP tools with names and schemas an agent can inspect before calling.
For large APIs, Astrail can keep the active interface small through Code Mode: the agent searches docs, inspects the relevant operation, then executes a constrained SDK-shaped call through endpoint maps.
What makes the generated server production-minded
A generated MCP endpoint should not just compile. It needs auth handling, validation, runtime permissions, private/public separation, response bounds, trace ids, and logs.
Astrail exposes those runtime states so teams can see whether a call executed, needed credentials, failed validation, or was denied before reaching the upstream API.
FAQ
Can Astrail convert Swagger to MCP?
Yes. Swagger and OpenAPI specs are supported inputs, including direct JSON or YAML files and docs pages that expose Swagger UI or Redoc.
Should every OpenAPI operation become an MCP tool?
Usually no. Small APIs can expose direct tools, while larger APIs often work better with search_docs, focused execution, and a reviewed subset of callable actions.