← Back to glossaryGlossary

A2A Protocol (Agent-to-Agent Protocol)

Reviewed 19 July 2026Canonical definitionPart of: MCP & Agent Protocol Terms →

The Agent-to-Agent (A2A) protocol is an emerging open protocol for agents to describe capabilities, exchange tasks, and return results across different frameworks and vendors.

§01 / QUESTIONSterm: A2A Protocol (Agent-to-Agent Protocol)
Questions

Common questions.

What is A2A Protocol (Agent-to-Agent Protocol)?

The Agent-to-Agent (A2A) protocol is an emerging open protocol for agents to describe capabilities, exchange tasks, and return results across different frameworks and vendors.

Which terms are related to A2A Protocol (Agent-to-Agent Protocol)?

Closely related concepts include Interoperability (Agent), MCP (Model Context Protocol), Model Context Protocol (MCP), Agent Protocol. Each is defined in the Prefactor glossary.

§02 / RELATEDnext: where this fits
Keep reading

Where this fits.

See how every agent performs, and make it better

Prefactor helps teams observe, evaluate, and improve their AI agents in production, across every framework and provider.