Host-supplied exact model selection IDs to allow for this running session. CAPI IDs are intersected with repository .github/allowed_models.txt policy; provider-qualified IDs remain exempt from repository-only policy but are restricted by this host list. Omit or pass null to clear the host restriction; an explicit empty or disjoint list is rejected. Validation and pre-selection fallback failures preserve the previous restriction. Failures after a fallback selection commits retain the new restriction and selected model; callers should inspect current session state after such an error.
Experimental. This type is part of an experimental wire-protocol surface
and may change or be removed in future SDK or CLI releases.