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api-guidelines/core-principles/api-first.md
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# API First
Everyone **MUST** follow the **API First** principle.
The API first principle is extension of contract-first principle. Therefore, an development of an API **MUST** always start with API design without any upfront coding activities.
**API description is the master of truth, not the API implementation.**
API implementation **MUST** always be compliant to respective API description which represent the [contract](./contract.md) between API and it's consumer.