contract-first

Contract-First Collaboration Coordinate frontend/backend or service-to-service work through one authoritative, machine-checkable contract. Consumers state what they need, providers implement that shape, and both sides verify against the same artifact before integration. This skill governs how teams change a boundary. It complements api-design , which governs what a good API looks like, and ai-regression-testing , which guards fixed bugs from returning. When to Activate Frontend and backend work will proceed in parallel. Two or more services exchange API payloads, events, or commands. Field names, nullability, enums, or error shapes regularly drift. One consumer needs several calls because the provider exposed storage models instead of a task-oriented response. A provider change can break consumers maintained by another person or agent. Mock responses and production responses no longer have the same shape. Show more Installs 496 Repository affaan-m/ecc GitHub Stars 240.3K First Seen Jul 26, 2026 Security Audits Gen Agent Trust Hub Pass Socket Pass Snyk Pass