How to turn an OpenAPI spec into an MCP server (2026 step-by-step)

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Every team evaluating Model Context Protocol (MCP) servers reaches the same question: do we hand-maintain a second description of our API for agents, or do we generate it from the contract we already have? If you keep an OpenAPI document, the second answer is the sane one. An OpenAPI spec is almost literally a tool catalog already — each operation has a name, inputs, outputs, and a transport. Converting it to MCP is a mapping problem, not a modeling problem. This walkthrough covers what the mapping actually is, where generic converters fail on real specs, and how to verify the result with a re

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