---
term: "Agent2Agent protocol (A2A)"
category: "Agent protocols"
url: https://agenticopenfinance.com/glossary/agent2agent-protocol
source: AgenticOpenFinance glossary
---

# Agent2Agent protocol (A2A)

> An open protocol for independent agents to discover each other and exchange tasks, messages and results.

The Agent2Agent protocol is an open standard for communication and interoperability between independent AI agent systems that may be built on different frameworks by different vendors. Agents publish agent cards describing their skills, and clients send them messages that create tasks, which progress through a defined lifecycle and produce artifacts. Agents collaborate without sharing their internal plans or tool implementations, so trust has to come from identity, authentication and records rather than inspection.

Related terms: [Agent card](https://agenticopenfinance.com/glossary/agent-card.md), [A2A task](https://agenticopenfinance.com/glossary/a2a-task.md), [Multi-agent system](https://agenticopenfinance.com/glossary/multi-agent-system.md), [Agent Payments Protocol (AP2)](https://agenticopenfinance.com/glossary/agent-payments-protocol.md)