{
  "id": 7902148,
  "title": "The system lives in your files, not your prompts",
  "url": "https://urgent.news/2026/09/16/the-system-lives-in-your-files-not-your-prompts",
  "topic": "ai",
  "section": "AI",
  "published": "2026-09-16T23:58:36.000Z",
  "source": {
    "name": "Dev.to",
    "slug": "dev-to",
    "url": "https://dev.to/derekwang85/the-system-lives-in-your-files-not-your-prompts-111k"
  },
  "original_language": "en",
  "account": "The system lives in files, not prompts, according to a senior engineer who witnessed the impact of this realization. The difference between a project that remains consistent and one that deviates is determined by the files that guide the model's output. These files form a pyramid of constraints, with five layers: strategy, architecture, contracts, gates, and implementation. Each layer builds upon the previous one, narrowing down the possibilities and providing a clear set of rules for the model to follow. The system's output is bounded by the files it reads before generating any content, making the constraints non-negotiable. By shifting from prompts to rules in files, teams can create a more robust and predictable AI system.",
  "summary": "AI Harness Engineering · Essay One · derek wang (derekwang85) Ask a senior engineer where \"the system\" lives and they'll point at the code, or the org chart. After shipping enough AI-governed projects, I'd point somewhere else: the system lives in the files that fence in what a model is allowed to generate. The longer I watch teams steer language models, the surer I am that the difference between…",
  "key_points": [
    "System resides in files, not prompts",
    "Five-layer pyramid of constraints guides output",
    "Constraints are non-negotiable rules for model"
  ],
  "editors_take": "Shifting from prompts to rules stored in files allows teams to create a more robust and predictable AI system by establishing a clear, non-negotiable set of constraints that guide the model's output.",
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}