feat(a2a): optional delegation-link block for the A2A profile#80
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Add an optional `delegation` block to the Trust Record: `parent_record_hash` (digest of the parent hop's record) and `credential_id` (the delegation credential this hop acted under). A chain of records linked this way forms an offline-verifiable delegation DAG. This is the foundation of the A2A profile; A2A is now stable at v1.x, clearing the prior roadmap blocker. Backward-compatible (MINOR): the field is optional and existing records without it remain valid. Updates the Pydantic model (Delegation), both JSON schemas, the schema docs, CHANGELOG, and ROADMAP. Suite: 78 passed. Closes agentrust-io/ca2a#15 Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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What
Adds an optional
delegationblock to the TRACE Trust Record, the foundation of the A2A profile:parent_record_hash— digest of the parent hop's Trust Recordcredential_id— the delegation credential this hop acted underA chain of records linked this way forms an offline-verifiable delegation DAG. A2A is now stable at v1.x, which clears the roadmap blocker noted for the A2A profile.
Backward-compatible (MINOR)
The field is optional; existing records without
delegationremain valid (all three canonical examples still pass). Updates theDelegationPydantic model, both JSON schemas (authoritativesrc/.../trace-v0.1.jsonand rootschema/trace-claim.json), the schema docs, CHANGELOG (Unreleased), and ROADMAP.Suite: 78 passed (5 new delegation tests across model + JSON-schema validation).
Closes agentrust-io/ca2a#15
🤖 Generated with Claude Code