{
  "instruction": "Response compression middleware enabled on the API server",
  "relevant_when": "Agent builds a backend API server that serves JSON responses",
  "context": "Every production API server must compress responses using gzip or brotli. This is done by adding compression middleware (e.g. compression for Express, @fastify/compress for Fastify, GZipMiddleware for FastAPI, GZipMiddleware for Django).",
  "sources": [
    {
      "type": "file",
      "filename": "skills/web-performance/SKILL.md",
      "tile": "tessl-labs/web-performance"
    }
  ],
  "checklist": [
    {
      "name": "compression-middleware-enabled",
      "rule": "The server setup includes compression middleware (e.g. compression, @fastify/compress, hono/compress, GZipMiddleware, flask_compress). The middleware must be registered/applied in the application setup code. Having no compression at all is a failure.",
      "relevant_when": "Agent sets up a backend API server"
    }
  ]
}