VCN #36: Crosstalk — Build Your Own A2A Endpoint

Two agents in the room discover each other. A2A, live, no middleman. A2A v1.0.0 shipped under Linux Foundation governance in March 2026. JSON-RPC 2.0 over HTTPS. SendMessage, SendStreamingMessage, GetTask, ListTasks, CancelTask. Agent cards at /.well-known/agent-card.json declare identity, capabilities, skills, security schemes. 150+ supporting organizations as of April 2026 — Atlassian, Box, Cohere, MongoDB, PayPal, Salesforce, SAP, ServiceNow, Workday. And almost nobody at a meetup has actually shipped one. VCN #36: Crosstalk changes that in one night. The premise: every builder in the room runs a tiny A2A server with one skill. A mini registry — also built live — scrapes every agent card in the room. Then we let agents find each other. One calls another. Logs print. Receipts visible.…