<p>Ruler solves the problem of maintaining AI assistant instructions across
multiple tools. Write rules once in <code>.ruler/</code> markdown files, then
generate tool-specific config files.</p>
<h2 id="how-it-works">How It Works</h2>
<ol>
<li>Author rules in <code>.ruler/*.md</code> files (markdown with frontmatter)</li>
<li>Run <code>ruler apply</code> to generate:
<ul>
<li><code>CLAUDE.md</code> for Claude Code</li>
<li><code>.cursorrules</code> for Cursor</li>
<li>Other tool-specific formats</li>
</ul>
</li>
<li>Rules are injected into the appropriate config file format</li>
</ol>
<h2 id="rule-structure">Rule Structure</h2>
<p>Rules are markdown files with scope metadata. They can target specific
directories, file types, or project areas.</p>
<h2 id="related-blog-posts">Related Blog Posts</h2>
<ul>
<li><a href="/ruler-cross-tool-ai-rules.html">Cross-Tool AI Rules with Ruler</a>:
setup and workflow</li>
</ul>


Cross-tool AI rule management. Maintains a single source of truth for AI assistant instructions, generating tool-specific config files for Claude Code, Cursor, and others.

Kyle Pericak

"It works in my environment"

Ruler

How It Works

Rule Structure