The original headline is: "The Most Dangerous Code in Your Repo Is the Behavior Nobody Can Prove"

Short summary

Production systems often contain critical behavior that no one can prove exists—whether through tests, docs, or design records. This undocumented behavior becomes especially risky when AI coding tools modify it without understanding why it matters. Teams need to treat evidence of behavior as a measurable system property, linking claims to actual tests and diffs so faster development doesn't sacrifice system understanding.

• •Undocumented behavior is invisible to code review but critical to system stability
• •AI coding agents amplify the risk by modifying code without context about why behavior exists
• •Solution: evidence-backed documentation—linking claims to tests, diffs, and design records

Generated with AI, which can make mistakes.