Agent patches can raise line coverage while destroying invertibility. A merge bar that only asks “did pytest exit 0? ” will accept a codec that no longer round-trips, a normalizer that is no longer idempotent, and a test file that passed because assertions got weaker.
Source: [Dev.to](https://dev.to/datacpp_8185/green-coverage-broken-inverse-a-round-trip-gate-for-agent-patches-40hd)