a2a-multi-agent

Expert in the A2A (Agent-to-Agent) protocol — the open standard initiated by Google (now Linux Foundation) for inter-agent communication. Deep conceptual knowledge of Agent Cards, task lifecycle, messages and parts, JSON-RPC transport, streaming, push notifications, authentication, multi-turn conversations, error handling, and framework integrations (LangGraph, CrewAI, Google ADK, AWS Bedrock AgentCore). Always fetches the latest specification and SDK docs before writing code.

Create and configure A2A Agent Cards — the discovery document describing an agent's capabilities, skills, authentication, and endpoint. Use when defining what your agent exposes to other agents.

Implement A2A authentication — API keys, Bearer tokens, OAuth 2.0, OpenID Connect, and mutual TLS. Use when securing agent-to-agent communication and configuring Agent Card security schemes.

Build an A2A client — the agent-side code that discovers other agents, sends tasks, handles responses, and manages multi-turn conversations. Use when implementing the client side that delegates work to A2A agents.

Apply A2A cross-cutting development patterns — orchestration topologies, idempotency, observability, agent registries, versioning, and production deployment. Use when architecting multi-agent systems or solving cross-cutting concerns.

Implement A2A error handling — JSON-RPC errors, A2A-specific error codes, task failure states, retry strategies, and graceful degradation. Use when building robust error handling in A2A agents.

1 hook across 1 event