Under the hoodTier: how much it should matter to you
2Useful: my rating, 1 to 5
3Signal: worth watching, 1 to 5
ArtifactsArea: what it touches
ImprovementsKind: in v2.1.242,
ImprovementsSection of the release
What
When an Artifact's HTML is handed to Claude to read, Claude Code now tracks which lines came back along with the file's size, modification time and hash, and marks the version as observed only if the entire file was returned and the bytes still match.
Details
Mismatches are recorded as file_changed, file_unreadable, superseded or seed_not_persisted.
Cases that cannot be checked either way fall back to a held, unverifiable state rather than counting as read.
Evidence
artifact_handover_read
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
