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row 155 (L1#3): a model's protocol override reaches the llm plane and is served, fail-closed (#51) - #841
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…nd is served, fail-closed (#51) Row-159 audit plane-llm L1#3: a model entry's `protocol` (#51, THE DESIGN §2 BEDROCK-INVOKE ruling; CHANGELOG "a model entry takes `protocol`") was dropped by the root's section builder and never read by the plane, so the plane wrote that model's requests in its provider's dialect and accepted an unknown override. The root now hands the member through (`kernel_sections`), and the plane resolves model override, else provider default, else the default dialect, refusing a dialect it does not serve naming the model. RED-able: exchange_shaping::a_models_protocol_overrides_its_providers_and_an_unknown_one_is_refused, root door_steps::a_models_protocol_override_is_handed_to_the_plane.
…lect (kind-isolation law0 busbar x vendor 92 -> 89) The root hands the model's override through as opaque data; its test now spells two neutral dialect words, so the root carries no vendor name (#841 gates: law0 busbar x vendor 92/89, law0-base 89/0).
This was referenced Oct 14, 2026
…not by section sign; merged origin/predev
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Row: /status 155. This fixes row-159 audit plane-llm L1#3 (HIGH, door path). It must be green before #824 leaves draft.
What. A model entry's
protocol(#51: model override, else the provider's default; the plane interprets it fail-closed. THE DESIGN §2 BEDROCK-INVOKE ruling; CHANGELOG "a model entry takesprotocol") was being lost in two places:root::door_steps::kernel_sectionsdropped it, so the plane never received it.Shaping::from_settingsnever read it, so every lane spoke its provider's dialect and an unknown override was accepted.Now the root passes the member through as
protocol(MODEL_PROTOCOL_KEYS[0]). The plane resolves the dialect as model override, else provider, else the default dialect. A dialect it does not serve is refused asmodel '<name>' uses unknown protocol '<p>'.Why. Spec l.2237 (#51): "model may override protocol+error_map; resolution = model-override-else-provider-default; plane interprets resolved dialect, unknown => fail-closed". 1.5.5 had no model-level protocol (additive in 1.6.0), so no 1.5.5 golden moves. A config that names no model protocol is byte-identical.
RED-able tests
busbar-plane-llm/tests/exchange_shaping.rs::a_models_protocol_overrides_its_providers_and_an_unknown_one_is_refusedcrates/busbar/src/root/tests/door_steps.rs::a_models_protocol_override_is_handed_to_the_planeLedger rows touched: none expected.
Not in scope: a per-model
error_mapoverride. The config grammar (busbar_contract::config::ModelCfg,deny_unknown_fields) does not accept one today.