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A2A vs MCP — what's the difference?

A2A agents publish an /.well-known/agent-card.json card (agent.json before v0.3) describing skills + endpoint. Talk via message/send (tasks/send on older agents).
MCP servers expose typed tools over JSON-RPC at a single HTTPS endpoint (commonly /mcp). Pick a tool, send args, get content back. A2A vs MCP explained →