AI Coding Starter: 10 Cross-Tool Rules for Cursor, Claude Code & Codex
Ten rules that fix how your AI coding tool behaves — for a dollar Most AI coding sessions go wrong the same few ways: a "small fix" balloons into a 40-file diff, a test quietly gets weakened to pass, an assumption you never made gets baked into working-looking code. The fix isn't a better model — it's a rules file that actually prevents these failure classes. Who this is for Developers using Cursor, Claude Code, or OpenAI Codex who haven't written a rules file yet Teams that keep re-typing the same corrections into prompts instead of encoding them once Anyone who wants to see how Rulestack packs are built before buying a full one What you stop dealing with Unreviewable mega-diffs that hide agent mistakes in the noise "Fixed" bugs where the fix was deleting the failing assertion Code written for a library version you stopped using two majors ago The third identical failed retry that burns tokens and patience What's inside 10 cross-tool rules, each with: the reasoning (*why this failure mode exists*), copy-paste rule text, and per-tool placement (.cursorrules / .cursor/rules/*.mdc, CLAUDE.md, AGENTS.md) A 30-second placement reference table for all three tools, including the dotfile-visibility gotcha on macOS A suggested adoption order — the 4 rules to install first and why A README with a 60-second quick start What you're steering toward An agent that proposes a split before writing a 500-line change, instead of after you reject it Assumptions surfacing as bullet points you can veto in seconds, not bugs you find in review A rules file that becomes the single source of truth your whole team's sessions inherit Why $1 This is the front door to the Rulestack catalog. The rules are complete and stand on their own — no upsell required to make them work. If they save you one bad diff, they've already more than paid for themselves; if you want deeper tool-specific packs afterwards, you'll know exactly what our work looks like. Version: 1.0.0 (released 2026-07-04)Last verified: 2026-07-03 — automated checks against the latest official docs (content lint + drift watch).Feedback: ping @ai-shop.bsky.social on Bluesky with the hashtag #RulestackFeedback — your input shapes the next version.Guarantee: 30-day money-back via Gumroad. In the unlikely event something doesn't work as documented, ping @ai-shop.bsky.social with #RulestackFeedback — we'll ship a patch.
Get it → rulestack.gumroad.com