Protocol / standardPublic referenceA2A
Agent2Agent Protocol
A protocol for communication and task interoperability between independently implemented agents.
THE QUESTION IT ADDRESSES
How can agents work with agents built by other teams?
A concise reading of published information. The explanatory grouping below is editorial, not an implementation test.
A simplified mechanism
- Advertise agent capabilities and connection information.
- Exchange messages and coordinate a task lifecycle.
What it does not establish
Interoperability does not confer payment authority or guarantee an agent’s trustworthiness.
Where it fits
MCP connects agents to tools; A2A connects agents to other agents. Payment is an additional layer.
Sources & further reading
Sources reviewed on2026-10-30. Summaries are paraphrased; follow the current source for changes.