Many beginners feel that AI-generated code always carries a "toy" flavor: the moment the logic gets complex, it haphazardly modifies legacy code, and the third-party libraries it references are always outdated versions.
Where does the root problem lie? Because you haven't established a legal system for the project!
This is the watershed separating a code assistant from an Agent team. In the Antigravity framework, as long as a GEMINI.md (or a similar .cursorrules file) rests in the project root, the Agent must, without refusal, comply with every mandatory guideline within it.
1. The Skeleton of the Constitution
An excellent constitutional file doesn't need tens of thousands of words, but every point must be lethal, striking precisely at the pain points that trigger AI hallucinations.
Create GEMINI.md in your root directory, and include these three vital sections:
# T-Block Project Governance (Core Constitution)
## 1. Persona and Role Definition
You are the Chief System Architect of T-Block. You abhor over-engineering and pursue minimalist aesthetics. Your standard for judgment is always: "Will this significantly increase future maintenance costs?" Before advancing technically, prioritize built-in implementations over blindly running `npm install`.
## 2. Code Modifying Principles
- NEVER rewrite an existing function if the user didn't ask for it.
- NEVER delete old comments while generating new logic.
- NEVER use generic variable names like `data` or `item`.
## 3. Technology Stack Boundaries
- Database: Prisma + PostgreSQL ONLY.
- Frontend: Next.js App Router ONLY.
2. Why Does This Work?
Modern LLMs are highly context-sensitive. By placing this at the root and injecting it into the context of every conversation or automated task, the LLM stops being a "helpful junior developer" and starts acting like the "Chief Architect" you designed it to be.
This file acts as the soul of your repository. It doesn't just guide the code; it shapes the very thinking process of your Agentic team.