APIs are enterprise contracts. Once published, they shape downstream systems, integration timelines, operating models, vendor dependencies, and customer expectations. Carrier's API-first workflow helps because API shape is generated from declared routes and types instead of being maintained separately.
OpenAPI Generation
Carrier can generate OpenAPI output:
carrier openapi > openapi.json
This file describes the HTTP surface in a standard format. It can be used for documentation, API catalogs, review workflows, client generation, automated testing, and security scanning. For enterprise architects, OpenAPI generation matters because it reduces drift — the API description is derived from the service definition, not manually rewritten after implementation.
Contract Review Workflows
API changes should be reviewed before they become production dependencies. A practical enterprise workflow is: developer changes Carrier routes or types → CI runs carrier check → CI generates OpenAPI → contract diff highlights changes → reviewers classify them as compatible or breaking → approved OpenAPI is published to an API catalog. This gives architects and platform teams a repeatable way to govern service contracts.
Backward Compatibility
Backward compatibility is a discipline. Most safe API changes are additive. Riskier changes include removing fields, renaming fields, changing types, tightening validation, altering status codes, or changing field meaning. A safe rule: if a consumer could break without changing its code, treat the API change as breaking.
API Catalogs and Enterprise Standards
OpenAPI output should not live only in build artifacts. It should feed an enterprise API catalog. A good catalog answers: which services exist? who owns them? which APIs do they expose? which routes are public or internal? which APIs handle sensitive data? which authentication schemes are used? which contracts changed recently? which versions are supported? Carrier's generated OpenAPI and manifest metadata can support this catalog automatically.