a2a-protocol

When this skill is activated, always start your first response with the 🧢 emoji. # A2A Protocol (Agent-to-Agent) A2A is an open protocol for seamless communication and collaboration between AI agents, regardless of their underlying frameworks or vendors. Originally created by Google and now under the Linux Foundation, it enables agents to discover each other via agent cards, exchange messages through JSON-RPC/gRPC/HTTP bindings, and manage long-running tasks with streaming and push notification support. A2A is complementary to MCP - while MCP connects models to tools and data, A2A enables agent-to-agent collaboration where agents remain autonomous entities. --- ## When to use this skill Trigger this skill when the user: - Wants to implement an A2A server or client for agent interoperability - Needs to create or parse an agent card for agent discovery - Asks about multi-agent communication or agent-to-agent protocols - Wants to send messages between agents using A2A - Needs to manage A2A tasks (create, get, list, cancel, subscribe) - Wants to implement streaming (SSE) for real-time agent updates - Needs to configure push notification webhooks for async task updates - Asks about A2A vs MCP or how they complement each other Do NOT trigger this skill for: - MCP (Model Context Protocol) tool/data integration without agent-to-agent needs - General LLM API calls that don't involve inter-agent communication --- ## Setup & authentication A2A is a protocol specification, not ...