Offering an MCP tool from APIs.io: get_openapi. Ask for an API by its catalog ID (for example twilio:twilio-accounts-api) and it returns the URL of that API's primary OpenAPI reference, or the full spec body inline if you ask for it. Saves an agent from hunting through a provider's docs site for the machine-readable contract.
Condition: live, read-only. Only APIs that publish or have a catalogued OpenAPI will return one.
How you get it: add the remote MCP server https://apis.io/mcp to Claude, Cursor, VS Code or any MCP client. No key, no sign-up and no card for this tool; the free tier works anonymously. Setup notes: https://apis.io/developer/mcp-server