---
type: Glossary Term
title: "A2A Task"
description: "An A2A Task is the core stateful unit of work in the Agent2Agent (A2A) protocol."
resource: "https://agenticweb.wiki/terms/a2a-task/"
tags: ["glossary", "coordinate"]
status: stable
generated: { by: agenticweb-builder/1.0, at: 2026-10-23T00:00:00Z }
verified: { by: process:agenticweb-engine, at: 2026-10-23T00:00:00Z }
stale_after: 2026-11-22T00:00:00Z
sources:
  - id: ref-1
    resource: "https://a2a-protocol.org/latest/specification/"
    last_modified: 2026-09-05T00:00:00Z
---

# A2A Task

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.

# Knowledge Graph

* **Related standards**: [Agent2Agent Protocol](/okf/protocols/a2a.md)

[^ref-1]: https://a2a-protocol.org/latest/specification/ (https://a2a-protocol.org/latest/specification/)