A rule you trust because it feels right <p>When a team works fast on a new AI product, they often rely on <b>_vibe-based rule_s</b>: short, informal guidelines for a decision that come from intuition and hands-on experience rather than from systematic measurement. In the captured material on Every's AI email assistant Cora, this kind of rule is part of how a rough prototype grows into a system serving thousands of beta users — the team's sense of what works shapes behavior before formal benchmarks exist.</p> How to think about them <p>Explore a vibe-based rule as a working judgment, not a spec:</p><ul><li>It names a <b>preference or constraint</b> in plain language.</li><li>It's adopted because outputs <i>feel</i> right, not because a test proved it.</li><li>It's the kind of rule a builder keeps in their head while iterating with AI — and it may later harden into a measured, formal rule.</li></ul> <ul><li>A vibe-based rule is an informal, intuition-backed guideline for a decision.</li><li>It contrasts with rules validated by systematic evaluation.</li><li>In this channel's material, such rules are a natural byproduct of building AI products like Cora by feel, quickly.</li></ul>