---
title: "Agent2Agent (A2A): Definition"
description: "An open protocol for AI agents to discover each other's capabilities, typically via an agent card, and exchange tasks and messages."
canonical: https://sudosapient.si/terms/a2a
updated: 2026-10-27
publisher: Sudo Sapient (https://sudosapient.com/)
---
# Agent2Agent (A2A)

**Agent2Agent (A2A):** An open protocol for AI agents to discover each other's capabilities, typically via an agent card, and exchange tasks and messages.

## Why it matters

A2A is relevant once several agents, often from different vendors, need to hand work to each other. It defines how an agent describes its skills in an agent card and how tasks are sent and tracked. Most companies do not need it for a first build, but publishing an agent card is a cheap way to be discoverable.

## Related terms

- [Model Context Protocol (MCP)](https://sudosapient.si/terms/mcp): An open protocol that standardises how AI applications connect to external tools and data sources through MCP servers exposing tools, resources and prompts.

## In practice

In a Sudo Sapient sprint, this is a building block of AI Product Development: agents, copilots and AI-native features shipped in 6–10 weeks. [Sudo Sapient's services](https://sudosapient.com/services/) describe the scope.