createos-fs
# Backend API — Agent Skill (Contract-Driven, Swagger-First)
What this skill does
# Backend API — Agent Skill (Contract-Driven, Swagger-First) This document defines the **authoritative backend SKILL.md** for generating backend APIs using **Node.js (Express)**. This skill is **contract-driven**: it teaches *how* to build backends correctly while allowing the **prompt to control scope and complexity**. The backend may use: * in-memory storage * PostgreSQL * placeholders …depending strictly on what the user asks for. --- ## File Layout ``` skills/backend-api-nodejs/ └── SKILL.md ``` Only `SKILL.md` is required. All correctness rules are enforced via contracts. --- ## SKILL.md ```markdown --- name: backend-api-nodejs description: Generate a Node.js (Express) backend API using in-memory storage or PostgreSQL, with Swagger (OpenAPI) documentation. Behavior and complexity are strictly controlled by the user prompt and backend contracts. --- # Backend API Generator — Node.js (Contract-Driven) ## Purpose This skill generates **runnable backend APIs** using **Node.** with **Swagger / OpenAPI documentation**. It does not assume databases, infrastructure, or complexity. Those are introduced **only when explicitly requested**. The skill enforces: - clean architecture - safe database usage - correct configuration - reproducible migrations - stable placeholders - accurate Swagger contracts All feature scope comes **only from the user prompt**. --- ## Governing Contracts (Mandatory) This skill must comply with the following contracts: - `ARCHITECTURE_CONTRACT.md` - `DATABASE_CONTRACT.md` - `CONFIGURATION_CONTRACT.md` - `MIGRATIONS_CONTRACT.md` - `CODE_QUALITY_CONTRACT.md` - `PLACEHOLDER_CONTRACT.md` - `SWAGGER_CONTRACT.md` - `README_CONTRACT.md` - `NON_GOALS.md` If a conflict arises, **contracts override this file**. --- ## When to Use Use this skill when the user: - wants a backend API - needs Swagger / OpenAPI documentation - wants a clean, safe backend scaffold - is prototyping or building real systems Triggering phrases include: - "Build a backend API" - "Generate Express endpoints" - "Backend with Swagger" - "Node.js API" --- ## Clarification Questions (Ask Only If Needed) Ask questions **only when required to proceed**: 1. Storage type? - in-memory (default) - PostgreSQL 2. Entities / resources? 3. Required operations per entity? - create - list - get - update - delete 4. Placeholder allowance for complex logic? If the prompt is sufficient, **do not ask questions**. --- ## Storage Rules ### In-Memory Mode Use in-memory storage when: - the prompt does not mention a database - the user is prototyping Rules: - Use Maps or arrays - Treat storage as ephemeral - No persistence assumptions ### PostgreSQL Mode Use PostgreSQL **only when explicitly requested**. Rules: - Use `DATABASE_URL` from environment variables - Use migrations for schema changes - Follow database and migration contracts strictly --- ## Placeholder Rules When the prompt allows placeholders: - Follow `PLACEHOLDER_CONTRACT.md` - Define stable interfaces - Return deterministic data - Document placeholders in Swagger and README --- ## API & Swagger Rules - Swagger is mandatory for all endpoints - Every route must be documented - Request and response schemas must be explicit - Error responses must be documented Swagger must be accessible via `/docs` by default. --- ## Architecture Rules - Routes/controllers are thin - Services contain business logic - Repositories handle persistence - No layer skipping Even in simple or single-file setups, these boundaries must be respected conceptually. --- ## Output Requirements The generated backend must: - run via `node index.js` or equivalent - expose Swagger UI - include `.env.example` if configuration is used - include migrations when PostgreSQL is used - include a README following `README_CONTRACT.md` --- ## Notes for the Agent - Do not add features not requested - Do not optimize prematurely - Do not introduce infrastructure implicitly - Prefer clarity over cleverness This skill exists to **build backends that can grow safely without forcing complexity**. ``` --- ## Usage Notes Install this skill alongside frontend skills. The backend skill enforces correctness via contracts while letting the prompt decide how much functionality is built.
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