// Follow protocols & specs
A2Av1.0.1
Agent2Agent (A2A) is an open protocol enabling communication and interoperability between opaque agentic applications.
Open source Maintained For agents
IN ONE PARAGRAPH
A2A is agent2Agent (A2A) is an open protocol enabling communication and interoperability between opaque agentic applications.
Good for: Developers who want their agent (Claude Code, Codex, Cursor…) to follow protocols & specs.
01How to start
- 1Read the official README for requirements and permissions.
- 2Install it as the official guide describes.
- 3Tell your agent the command exists (e.g. in AGENTS.md / CLAUDE.md) so it knows when to call it.
02Alternatives & comparison
Compare side by side → a2a-python Official Python SDK for the Agent2Agent (A2A) Protocol ★ 2.2k agents.md AGENTS.md — a simple, open format for guiding coding agents ★ 25k modelcontextprotocol Specification and documentation for the Model Context Protocol ★ 9.5k agent-client-protocol A protocol for connecting any editor to any agent ★ 4.4k llms-txt The /llms.txt file, helping language models use your website ★ 2.7k
03Related
- ›Hugging Face AI Agents Course · Hugging FaceMultilingual (incl. EN/ZH)
- ›huggingface/agents-course · Hugging FaceEnglish
- ›AI Agents for Beginners · MicrosoftMultilingual (incl. EN/ZH)
- ›Building effective agents · AnthropicEnglish
- ›OpenAI: A practical guide to building agents · OpenAIEnglish
- All tutorials →