The Coding Agent Rules Pack: Drop-In Rules for Cursor, Claude Code, Codex (AGENTS.md) and GitHub Copilot

Your coding agent is quick. It is also happy to announce "done" without running the tests, rewrite a whole file to change one line, and install a package that doesn't exist. The Coding Agent Rules Pack gives it house rules: ready-to-drop-in instruction files that tell it to run your real commands and show the results before claiming done, keep diffs small, check that every package exists before installing it, keep secrets out of code and commits, follow your code style and git habits, and ask instead of guessing when something is hard to undo.

The files are organized by tool, in each tool's own format: .cursor/rules/*.mdc with proper frontmatter for Cursor, CLAUDE.md plus .claude/rules/ for Claude Code, AGENTS.md for OpenAI Codex and other AGENTS.md-aware agents, and .github/copilot-instructions.md for GitHub Copilot. Pick your stack, copy one folder, fill in a short project-context template, and you're set up. The 18-page PDF guide explains how each tool loads rules, how to install, customize, and combine them, the mistakes that make rules fail silently, and ends with a one-page cheat sheet. Every file path and format was checked against each tool's official docs in October 2026, and the guide lists the sources so you can re-check them when the tools change.

What's included

• Universal base rules: read before editing, ask when unsure, small diffs, dependency and package-hallucination checks, no secrets, code style, verify before "done", git hygiene, and a standard end-of-task summary
• 8 stack variants with real commands and stack-specific traps: TypeScript + Next.js, React + Vite, Node.js + Express API, Python + FastAPI, Python data and notebooks, Go service, Rust, React Native (Expo or bare)
• 6 task-mode add-ons: bugfix, refactor, tests-first, security review, docs, and always-on "don't touch" boundaries
• Fill-in Project Context template: commands, layout, conventions, environment, owners, gotchas
• Cursor set: .cursor/rules/*.mdc files with alwaysApply / description frontmatter, plus 8 stack rules
• Claude Code set: CLAUDE.md, .claude/rules/ files, and mode files to @-mention
• AGENTS.md set: ready-assembled AGENTS.md for each stack plus a generic one
• GitHub Copilot set: .github/copilot-instructions.md for each stack, a path-specific tests.instructions.md, and the task modes as .prompt.md files
• Tool-neutral source modules so you can maintain one set of rules for several tools
• 18-page PDF guide with install commands, customization, combining files, common mistakes, troubleshooting, a one-page cheat sheet, and the official doc sources checked
• 83 files in one ZIP, plain Markdown, edit anything

Written for Cursor, Claude Code, OpenAI Codex, and GitHub Copilot as documented in October 2026. AI coding tools change their file conventions over time; the guide shows how to check that each file is loaded.

License: personal and commercial use in your own projects (including client and employer projects you work on). No resale or redistribution of the files.

Instant download. Not affiliated with Cursor, Anthropic, OpenAI, or GitHub.