Auto-Map REST APIs into MCP Tools
lazycodewiz · reddit · 2026-07-10
The author shares a method to automatically generate MCP tools from a REST API with an OpenAPI 3.1 spec. At startup, it reads the OpenAPI file, generates a tool for each operation, builds the input schema from parameters and request bodies, resolves $ref, and handles circular references. During invocation, it maps the parameters back to HTTP requests. The post also covers implementation challenges like tool bloat, description handling, and processing oneOf/anyOf.
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