UAI-1 and A2A can meet around agent work, but they answer different questions. A2A-oriented material is about agents coordinating tasks. UAI-1 is about preserving a reviewable exchange record after a boundary is crossed.
| Criterion | UAI-1 | A2A |
|---|---|---|
| Primary question | How can an exchange be validated, traced, and preserved across a public or organizational boundary? | How can agents discover one another, coordinate tasks, and delegate work across participating systems? |
| Primary object | Message envelope, profile body, validation result, provenance, trust, and integrity evidence. | Agent identity, capability discovery, task coordination, and interaction flow as described by A2A source docs. |
| Evidence posture | Public message evidence, validation, provenance, integrity, and registry alignment are central. | Task coordination and agent capability exchange are central; consult A2A docs for protocol-specific fields. |
| Best fit | Cross-boundary handoffs, release records, implementation evidence, and durable project memory. | Agent-to-agent workflows where task status, delegation, and interaction between agents matter. |
| Use together when | An A2A task or interaction produces an artifact, decision, status update, or handoff that needs durable validation and source evidence. | |
Use-together pattern
- Coordinate live work through the agent protocol surface. Keep discovery, delegation, task updates, and interaction mechanics in the protocol that owns them.
- Preserve durable evidence through UAI-1. When a task result becomes a release record, audit artifact, cross-team handoff, or public support claim, validate and store the UAI-1 exchange evidence.
- Keep both records linked. A task coordination record can point to a UAI-1 conformance result; the UAI-1 record can cite the task or handoff context without claiming to be the live coordination protocol.
Decision rule
If the problem is mostly about coordinating agents during work, read the A2A source first. If the problem is mostly about preserving a reviewable exchange after work crosses a boundary, read UAIX first. If both are true, document the live coordination separately from the durable evidence record.
Support boundary
This page does not claim LlmWikis runs an A2A implementation, an A2A-to-UAI bridge, or a public UAI-1 runtime. It is a decision-support page for readers comparing layers. Implementation claims need source-backed code, tests, validator evidence, release notes, and current canonical documentation.