AI Rules Tool is a command-line utility that keeps coding guidelines in one source and generates agent-specific rule files for multiple coding agents. Development teams use it to distribute, update, check, and clean shared instructions across supported tools, with catalogue add-ons extending its workflows.
Borrowing it
Nothing to install: this file belongs to block/ai-rules. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/block/ai-rules/main/AGENTS.mdgit clone --depth 1 https://github.com/block/ai-rulesWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/instructions/block/ai-rules/agents-md)<a href="https://agentmods.dev/instructions/block/ai-rules/agents-md"><img src="https://agentmods.dev/badge/instructions/block/ai-rules/agents-md/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/instructions/block/ai-rules/agents-md"><img src="https://agentmods.dev/badge/instructions/block/ai-rules/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00017 | $0.00017 |
| Opus 5.5 | $0.00007 | $0.00007 |
| Sonnet 5.5 | $0.00003 | $0.00003 |
| Haiku 4.5 | $0.00002 | $0.00002 |
Grade A, and why
ai-rules AGENTS.md scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
Copies of this mod
1 near-identical copy found in the catalogue:
- ai-rules CLAUDE.md — 100% identical, 0 lines differ
What it actually says
ai-rules/.generated-ai-rules/ai-rules-generated-AGENTS.md
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 2mo ago First seen · 1 lines · 17 tokens per session scan A a1e66b52fcfe
ai-rules AGENTS.md is an instructions file published in the GitHub repository block/ai-rules (144 stars, last pushed 5mo ago), licensed Apache-2.0. It adds 17 tokens to every session, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
ai-rules AGENTS.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| ai-rules AGENTS.mdblock/ai-rules | Instructions file | 144 | 5mo ago | Apache-2.0 | A | 17 | Codex, OpenCode |
| awesome-ai-rules copilot-instructions.mdshumatsumonobu/awesome-ai-rules | Instructions file | 1 | 3mo ago | MIT | A | 236 | GitHub Copilot |
| awesome-ai-rules react.instructions.mdshumatsumonobu/awesome-ai-rules | Instructions file | 1 | 3mo ago | MIT | A | 209 | GitHub Copilot |
| awesome-ai-rules testing.instructions.mdshumatsumonobu/awesome-ai-rules | Instructions file | 1 | 3mo ago | MIT | A | 178 | GitHub Copilot |
| vscode buildNext.instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 9,719 | GitHub Copilot |
| next.js AGENTS.mdvercel/next.js | Instructions file | 143k | yesterday | MIT | A | 7,461 | Codex, OpenCode |
| langchain AGENTS.mdlangchain-ai/langchain | Instructions file | 149k | yesterday | MIT | A | 4,680 | Codex, OpenCode |