Commit Descriptions Become AI Coding’s Human Check

The commit body is more valuable as a comprehension test than as documentation generated after the fact.

• –AI agents can invent plausible rationale when project context is missing.
• –Writing the description forces review of behavior, intent, trade-offs, and unintended changes.
• –Temporary decisions and exit criteria are rarely recoverable from code alone.
• –Agents can summarize the diff, but humans should own the rationale and shipping decision.