ADR-026 Adapter Metadata Contract (E0)¶

Intent¶

Ensure every adapter-emitted EvidenceEvent is traceable to: - adapter implementation identity (adapter_id) - adapter build/version (adapter_version)

This enables audit reproducibility and regression triage across protocol/version churn.

Required fields (v1)¶

• adapter_id: stable identifier, e.g. assay-adapter-acp
• adapter_version: semver string (crate version)
• protocol_name: e.g. acp
• protocol_version: spec version string or range carried by the adapter output

Placement¶

Metadata must be present in the adapter output envelope such that: - it is carried into EvidenceEvent payload or extensions - it is available even in lenient fallback events - it survives raw-payload preservation / lossiness reporting paths

Non-goals¶

• No behavior changes to mapping semantics
• No workflow changes
• No release-line publication changes