Rivetport: API Compatibility by Contract

Field notes

Rivetport compares an existing OpenAPI contract with a replacement specification, then turns reviewed differences into explicit route, query, and field rules. Its example maps GET /v1/items/:id to GET /catalog/:product_id, including product_id→id and available→in_stock, and can run locally in the browser. The stated scope is deliberately narrow: read-only catalog and reference-data APIs, with bounded arrays and separate success/error responses; writes, joins, guessed pagination semantics, and private-network APIs are excluded.