Agent Rules Builder

Agent Rules Builder is a free web tool that generates structured configuration files for AI coding assistants, helping developers teach their AI tools to write code that matches their project's conventions, stack, and style. It draws from 10,000+ community-contributed rules distilled from real open-source repositories, organized by language, framework, and category. Users can select their stack, customize rules, and export to any supported agent format — no sign-up required. The tool supports all major AI coding assistants including Cursor, Claude Code, GitHub Copilot, Windsurf, Cline, OpenAI Codex, and Gemini CLI.

• Multi-Agent Export — Generate rules once and export to .cursorrules, CLAUDE.md, .github/copilot-instructions.md, .windsurfrules, and more from a single builder.
• 10,000+ Community Rules — Rules are distilled from thousands of real-world GitHub repositories, curated and condensed at three verbosity tiers: concise, balanced, and detailed.
• 40+ Languages & Frameworks — Supports TypeScript, Python, Rust, Go, Swift, Java, C#, Ruby, and more, with framework-specific rules for React, Next.js, FastAPI, Django, Rails, and hundreds of others.
• Pre-Built Templates — Browse 50+ ready-to-use rule sets for popular stacks like Next.js + TypeScript, Python + FastAPI, Vue + Nuxt, and Rust + Axum.
• Rule Analyzer — Analyze existing rules files to identify gaps, redundancies, and improvement opportunities.
• Share & Fork — Save rule sets, share them via public link, and fork others' configurations as a starting point.
• No Sign-Up Required — Completely free with no usage limits, no premium tiers, and no account needed to generate and export rules.
• Guides & Best Practices — 16 in-depth guides covering setup, security, team workflows, monorepos, and advanced AI coding techniques.