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When an AI can enter your project or folder, the question is no longer only whether it gives a good answer. It can edit before it understands the rules, draw a conclusion from unchecked material, or say a job is finished halfway through.
These instructions give that kind of agent a clear way to work. The agent needs to understand the project and task before doing what needs doing. A small fix should not become a ceremony. But data, secrets, publication, and changes that affect each other need clear scope and impact before work begins, and a result you can check afterwards. Your tool’s permissions—and any real decision to publish or make an irreversible change—remain yours.
| Tool | Simplest installation point |
|---|---|
| Claude Code | Root CLAUDE.md |
| OpenAI Codex | Root AGENTS.md |
| Cursor | Root AGENTS.md |
| Antigravity | Always-on Workspace Rule |
Ordinary ChatGPT and Claude web chat are not supported here as reliable project agents.
Use the current official instructions for UI details: Claude Code, Codex, Cursor, and Antigravity.
The instruction matches effort to impact. A clear small fix can be completed and read back directly. Work involving data, secrets, public release, or several dependent changes gets the extra checks and confirmation it needs.
You do not need to understand how the rules were assembled. Paste the full instruction into your tool, then begin with one small, real task.