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# A2A (Agent2Agent Protocol)
- URL: https://www.adlingo.org/glossary/a2a/
- Published: 2025-01-15T12:18:00.000Z
- Updated: 2025-01-15T12:18:00.000Z
- Description: An open protocol that lets AI agents built by different vendors, on different frameworks, discover each other and communicate directly.
- Author: Travis Lusk
- Tags: Agentic Advertising, #glossary, #Import 2026-10-27 17:05

How agents talk to other agents. MCP connects an agent to tools. A2A connects an agent to another agent. When your buyer agent needs to negotiate with a seller agent from a different vendor, A2A is the phone line between them. No shared vendor required.