api-contract

# API Contract ## Overview API Contract guides the creation of `api-contract.md` files that serve as the shared interface between backend and frontend agents during sprint execution. The contract defines request/response schemas, endpoint routes, TypeScript interfaces, and error formats so that implementation agents build to an agreed specification without direct coordination. ## Prerequisites - Sprint directory initialized at `.claude/sprint/[N]/` - `specs.md` with defined feature scope and endpoint requirements - Familiarity with RESTful API conventions (HTTP methods, status codes, JSON schemas) - TypeScript knowledge for interface definitions (recommended) ## Instructions 1. Create `api-contract.md` in the sprint directory (`.claude/sprint/[N]/api-contract.md`). Define each endpoint using the standard format: HTTP method, route path, description, request body, response body with status code, and error codes. See `${CLAUDE_SKILL_DIR}/references/writing-endpoints.md` for the full template. 2. Define TypeScript interfaces for all request and response types. Use explicit types instead of `any`, mark optional fields with `?`, and use `string | null` for nullable values. Reference `${CLAUDE_SKILL_DIR}/references/typescript-interfaces.md` for canonical type patterns. 3. For list endpoints, include pagination parameters and the `PaginatedResponse<T>` wrapper. Standardize on `page`, `limit`, `sort`, and `order` query parameters as documented in `${CLAUDE_SKILL_DIR}/references...