- Profiles gain routing (OFF, HEURISTIC, CLASSIFIER) with simple, complex
and classifier models. The heuristic is a small documented rule set; the
classifier is one 4-token call on the question text only (ROUTE usage,
3 s timeout, heuristic on any failure, skipped for PHI on a
non-eligible provider).
- assistant_model.fallback_model_id chains (cycle-checked, max 4 hops)
across providers; retryable failures before any output fall back.
Candidates that are disabled, down, over a STOP budget or fail the PHI
rule are skipped; without a chain, LOCAL falls back only to LOCAL.
- Circuit breaker (provider health UP/DOWN, down_until) and a cached
health probe for stale LOCAL providers.
- A mid-turn provider switch rebuilds history from neutral parts and drops
adapter state (Anthropic thinking signatures).
- Turn route decision, source and fallback count; home shows health and
fallbacks.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
james.maes
