AI Rules Builder

Create, preview and share AGENTS.md and Cursor rules for AI coding agents.

Every coding agent expects a different rules file. Pick the target tool, switch rule sets on or off, and export the correctly named file. It runs in your browser: no account, no database, no tracking.

20 editable rule sets in 7 categories, each switchable on its own
Drop in package.json or requirements.txt and get matching rule sets suggested, parsed in the browser
Output for AGENTS.md (Codex, Command Code, agy, deepseek-harness), .cursor/rules/*.mdc and legacy .cursorrules
Live preview with copy, download and a token estimate
Share links that carry the whole configuration, plus a read-only JSON API at /api/rules

Platform: Web
Live at: markdown-helper.vercel.app
Shipped: 21 Oct 2026

Open the app Source code

Runs in your browser. Nothing to install.

AI Rules Builder: rule switches on the left, live AGENTS.md preview on the right

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