a new chat offered fable. not displayed it — SELECTED it, sent it, and the
server honoured the choice it was given. the composer's fallback was
providerModels[0], the first entry in the catalogue, which is not a default but
an ordering accident. the file already carried a comment about the day fable was
added above opus and every resumed session came back claiming fable; the same
accident then quietly defeated the whole server-side default.
so the fallback prefers the platform's default and uses catalogue order only
when that model is not in the provider's list at all — which is every opencode
model, where there is no officer-wide default to prefer.
and a test, because a comment cannot hold a constant mirrored across two
packages. it asserts the client's copy equals the server's, and that the value
names a tier rather than the bare harness. both of the ways this default has
been defeated are now failures a test catches: a drifted mirror, and a stored
harness read as a choice.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Officer-Session: 656f5c85-e49a-4f1f-b9f3-042a04b4d043
