Under the hoodTier: how much it should matter to you
2Useful: my rating, 1 to 5
0Signal: worth watching, 1 to 5
SessionsArea: what it touches
ImprovementsKind: in v2.1.219,
ImprovementsSection of the release
What
Assistant messages flagged as API errors keep that flag across serialization, so a resumed or replayed session can distinguish them from real assistant output.
Details
Transcript serialization emits is_api_error_message: !0 for such messages.
The reverse conversion maps it back to isApiErrorMessage.
This joins the existing aborted and is_virtual flags.
Evidence
is_api_error_message
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
