# A2A Task

[6 · Coordinate](/category/coordinate/)

| A2A Task |
| --- |
| Category | [Coordinate](/category/coordinate/) |
| Also known as | Task lifecycle, A2A Artifact |
| Related | [Agent2Agent Protocol](/protocols/a2a/) |

[Coordinate](/category/coordinate/) An A2A Task is the core stateful unit of work in the Agent2Agent (A2A) protocol. When a client agent sends a message to a remote agent, the server tracks execution through a deterministic state machine (submitted, working, input-required, auth-required, completed, failed, canceled, rejected), streaming incremental status events and emitting immutable output Artifacts composed of typed content Part objects. Used by: a2a.

## Instances

Not applicable.

## See also

- [Agent2Agent Protocol](/protocols/a2a/)

## References

- [https://a2a-protocol.org/latest/specification/](https://a2a-protocol.org/latest/specification/) (2026-09-05) VERIFIED

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