A2A protocol

A protocol for a client agent to discover and exchange task-related messages with a remote agent. It complements tool protocols but does not make autonomous delegation trustworthy.

Terms this definition uses

Delegation

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 client · A2A server · Agent skill · Agent task · Agent artifact

← JSON-RPC · A2A client →

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