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api-contract-first

Hard gate before implementing any API endpoint or service interface. Requires a written, reviewed contract (OpenAPI 3.x, protobuf, or GraphQL schema) before any implementation code is written. Prevents breaking changes, misaligned clients, and undocumented behaviour.

plugins/RBraga01/a-team/skills/api-contract-first/SKILL.md

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Nov 6, 2026
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Apache-2.0

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# API Contract First

## The Law

```
NO API IMPLEMENTATION WITHOUT A REVIEWED CONTRACT.
Writing endpoints before the contract is building to a spec that doesn't exist.
The contract IS the spec. Code that matches it is correct. Code that doesn't is wrong.
```

## When to Use

Use this skill before writing ANY of these:
- A new REST endpoint