Glossary · Agents and protocols
A2A
Agent-to-Agent, a protocol for one agent to discover another's capabilities through an agent card and delegate tasks to it over HTTP.
What A2A means
Agent-to-Agent, a protocol for one agent to discover another's capabilities through an agent card and delegate tasks to it over HTTP. It standardises the handshake between agents, not what they may do; an agent card is a claim about capability that a caller still has to test.
What A2A can and cannot support
| It can support | It cannot support |
|---|---|
| Agent-to-Agent, a protocol for one agent to discover another's capabilities through an agent card and delegate tasks to it over HTTP. | It standardises the handshake between agents, not what they may do; an agent card is a claim about capability that a caller still has to test. |
Terms this definition uses
Definitions that name A2A
Related terms in Agents and protocols
How autonomous agents plan, remember, call tools and talk to each other, including MCP and A2A, and where each step can go wrong.
AI agent · Agent loop · Planner · Executor · Agent memory · Working memory · Long-term memory · Episodic memory · Semantic memory · Agent orchestration · Multi-agent system · Agent handoff · Delegation · Tool result · Tool schema · Tool description · Tool selection · Tool permission · Human-in-the-loop · Human-on-the-loop · Approval gate · Agent sandbox · Agent identity · Agent authorization · Agent discovery · Capability negotiation · MCP server · MCP client · MCP host · MCP resource · MCP prompt · MCP tool · MCP transport · JSON-RPC · A2A protocol · A2A client · A2A server · Agent skill · Agent task · Agent artifact · WebMCP
Questions about A2A
What is A2A?
Agent-to-Agent, a protocol for one agent to discover another's capabilities through an agent card and delegate tasks to it over HTTP.
What does A2A not show or guarantee?
It standardises the handshake between agents, not what they may do; an agent card is a claim about capability that a caller still has to test.
Which area of the glossary does A2A belong to?
Agents and protocols: How autonomous agents plan, remember, call tools and talk to each other, including MCP and A2A, and where each step can go wrong.
← WebMCP
See it in the full glossary · 668 terms across 19 areas.