A2A Agent Interoperability Review Checklist

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Fit check
[ ] Agents cross process, team, runtime, or vendor boundaries
[ ] Caller must discover remote capabilities
[ ] Task lifecycle can include progress, refusal, error, timeout, retry, and cancellation
[ ] Caller and callee have stable owners
[ ] Deterministic workflow or local tool call is insufficient

Agent card
[ ] Capabilities listed
[ ] Input schemas versioned
[ ] Output schemas versioned
[ ] Required scopes listed
[ ] Owner listed
[ ] Timeout policy listed
[ ] Lifecycle states listed
[ ] Backward compatibility policy listed

Message envelope
[ ] Trace ID required
[ ] Message ID required
[ ] Task ID required
[ ] Idempotency key required where needed
[ ] Source agent recorded
[ ] Target agent recorded
[ ] Tenant recorded
[ ] Audience recorded
[ ] Scopes recorded
[ ] Timeout recorded

Authorization and lifecycle
[ ] Caller is authenticated
[ ] Audience is verified
[ ] Scopes are verified
[ ] Tenant boundary is enforced
[ ] Duplicate messages are detected
[ ] Refusal is a valid outcome
[ ] Cancellation is a valid outcome
[ ] Timeout is a valid outcome
[ ] Delegation loops are detected
[ ] Capability-level kill switch exists

Evaluation
[ ] Fixture covers valid call
[ ] Fixture covers wrong audience
[ ] Fixture covers missing scope
[ ] Fixture covers schema mismatch
[ ] Fixture covers duplicate message
[ ] Fixture covers refusal
[ ] Fixture covers timeout and cancellation
[ ] Fixture covers delegation loop
[ ] Fixture covers backward-compatible schema evolution

Release decision
[ ] Green: ready for controlled use
[ ] Yellow: limited use; improve schemas, auth, lifecycle, or traces
[ ] Red: demo only

Required changes:

Reviewer notes: