A2A Protocol Implementation Guide
How to implement the Agent-to-Agent (A2A) protocol. Covers agent cards, task routing, streaming, and security considerations.
Overview
The Agent-to-Agent (A2A) protocol enables AI agents to discover and communicate with each other through standardized interfaces. This guide covers implementing A2A from scratch: serving agent cards at /.well-known/agent.json, handling task submissions via /a2a/tasks/send, implementing streaming responses with sendSubscribe, and securing agent-to-agent communication. Includes examples in TypeScript, Python, and Go.
Features
- -Agent card specification and hosting
- -Task submission and response handling
- -Streaming with Server-Sent Events
- -Authentication between agents
- -Registry discovery integration
Security Considerations
A2A agents accept tasks from other agents -- this is a significant trust boundary. Always validate the calling agent's identity, sanitize task inputs, and never execute code received through A2A messages. Agent impersonation attacks are possible if agent cards are not cryptographically signed.
Scan for vulnerabilities: npx hackmyagent secure
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