Status: AVAILABLE (contracts; decision runtime with S1 shadow-only). See status labels. A decision backend answers a typed question over typed candidates. The graph names the primitive, never the backend.

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Architecture contract

Produce a DecisionBackendProfileV1, a DecisionReadoutProfileV1 and a DecisionCalibrationManifestV1 co-versioned with the backend. The manifest is bound to the exact model, revision, runtime, question and candidate schema. Your backend returns a DecisionResultV1 over the given candidates; output outside the candidate set is a malformed decision and is rejected. Gate to leave shadow: calibration metrics. Agreement with another model is not a criterion. Validate against the schema in spec/Contracts/kernel/v1/schemas/ before anything else. Receivers fail closed, so a document that does not validate is rejected, not repaired.

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Current implementation

The runtime is on main and runs S1 shadow by default. A backend you add will run in shadow and record decisions without acting until a primitive passes the gate for that backend and is put in a canary (see Calibration).

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Availability

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Developer relevance

Report abstain when uncertain. A calibrated abstention is worth more than a confident guess.