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Setting `models.tier.deep anthropic:claude-opus-4-8` silently disabled think and auto_think: the Anthropic recipe's chat allowlist stopped at Opus 4.7, the tier-resolved model never joined the extended set that assertTouchpoint's contract promises for config-chosen models, and the resulting probe failure was stamped NO_ANTHROPIC_API_KEY — sending the operator to debug env/keychain when the fix was the model id. Three fixes, one per layer: - recipes/anthropic.ts: add claude-fable-5, claude-opus-4-8, and claude-sonnet-5 to chat models; claude-sonnet-5 to expansion models. - gateway.ts reconfigureGatewayWithEngine: resolve all four tiers and register the results as extended models, honoring the documented contract for models.default / models.tier.* (model-resolver.ts docstring). A tier-only model now validates like a chat/expansion one. - think/index.ts: when the gateway client can't be built, re-probe and label honestly — MODEL_NOT_USABLE:<reason> for unknown_model / unknown_provider, NO_ANTHROPIC_API_KEY only for the actual missing-key case; the stub answer carries the probe detail and fix hint. Tests: recipe-list presence pins; a new gateway-tier-extended-models suite proving a fictional tier model validates post-reconfigure (and an unconfigured one still doesn't); think-pipeline coverage for the honest label (unknown_model beats missing-key even keyless); the existing non-explicit bogus-provider test updated from the old catch-all label to the honest one (no-throw contract unchanged). Verified live: a brain with tier.deep=claude-opus-4-8 had think degrade to gather-only with the misleading key warning; with this change the probe passes and synthesis runs. Co-authored-by: Paolo Belcastro <p3ob7o@users.noreply.github.com> Co-authored-by: Claude Fable 5 <noreply@anthropic.com>