What
The guard that stops Claude overwriting an artifact with stale content now reports which situation it hit, including a new refusal when the model resends byte-identical content that was already rejected, and a separate one when a sibling agent read the live version earlier in the same turn.
Details
- The old helper that quietly auto-read and reseeded the version (reporting outcomes like a gate being off or a cap being exceeded) was removed.
- Refusals now come from either the local guard or a 409 from the server, and telemetry labels which of the two fired.
Evidence
stale_version_guard_seeded
Strings lifted out of the shipped bundle, so the claim above can be checked against them.