rulesync AGENTS.md

A repository instruction file that tells AI coding assistants which coding style, testing, quality, security, and privacy rules to follow. It applies to tools such as Claude Code, Cursor, Copilot, Cline, and Windsurf.

In plain words
What is it for?
Use it to require TypeScript strict mode, preferred export styles, tests for business logic, explicit error cases, secret protection, and safe handling of external input.
Why use it?
It gives coding assistants one shared set of project rules, reducing inconsistent code, missing tests, unsafe input handling, and accidental exposure of secrets.

Instructions file for CodexOpenCode

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add instructions/juwonllee2024-dotcom/rulesync/agents-md
Clone the repo
git clone --depth 1 https://github.com/juwonllee2024-dotcom/rulesync

Made for: Codex, OpenCode.

Per session 175 This file is loaded in full into every session.
When invoked 175 The same file — it is already loaded in full.
Security scan B 2 findings. Scan, not verified.
Origin 83% copy Near-identical to another mod in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5 $0.00175 $0.00175
Opus 5 $0.00088 $0.00088
Sonnet 5 $0.00035 $0.00035
Haiku 4.5 $0.00017 $0.00017

Measured 2d ago against content hash dfc2171c1041, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade B, and why

rulesync AGENTS.md scanned grade B with 2 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 2d 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.

Asks for rootlowPrivilege escalation

A mod that escalates privileges can change anything on the machine, not only the project.

- Do not execute destructive shell commands (`rm -rf`, `chmod 777`).

Downgraded: this mod is about security review, or the phrase is quoted, so it is likely naming the pattern rather than instructing it.

Recursive force deletemediumDestructive command

rm -rf with a variable or a broad path is one typo away from removing the wrong tree.

- Do not execute destructive shell commands (`rm -rf`, `chmod 777`).

Downgraded: this mod is about security review, or the phrase is quoted, so it is likely naming the pattern rather than instructing it.

Origin

This is a copy

83% identical to rulesync copilot-instructions.md — 14 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

AGENTS.md · 20 lines

What it actually says

Repository AI Rules

Canonical repository instructions for AI coding assistants (Claude Code, Cursor, Copilot, Cline, Windsurf).

Code Style & Standards

  • Always use TypeScript strict mode with explicit return types.
  • Prefer named exports over default exports.
  • Use immutable state updates and modern ES2022+ syntax.

Testing & Quality

  • Write unit tests for all business logic using Vitest or Jest.
  • Maintain high test coverage and test edge cases and error paths explicitly.

Security & Privacy Guidelines

  • Never hardcode API keys, access tokens, or secrets in source code.
  • Always validate external input and check path resolution bounds.
  • Do not execute destructive shell commands (rm -rf, chmod 777).
Changes

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.

  1. 2d ago First seen · 20 lines · 175 tokens per session scan B dfc2171c1041

Subscribe to this mod's changes

rulesync AGENTS.md is an instructions file published in the GitHub repository juwonllee2024-dotcom/rulesync (3 stars, last pushed 11d ago), licensed MIT. It adds 175 tokens to every session, about $0.0009 per session on Opus 5. A static security scan graded it B with 2 findings (asks for root, recursive force delete). It is 83% identical to rulesync copilot-instructions.md, differing in 14 lines, and is treated as a copy.