At Google Cloud Next 2025, Google introduced the Agent2Agent (A2A) protocol and donated it to the Linux Foundation less than three months later. By April 2026 — one year in — it has 150+ supporting organizations, 22,000+ GitHub stars, and active production deployments across finance, supply chain, and IT operations. Every major agentic framework (LangGraph, CrewAI, LlamaIndex Agents, Semantic Kernel, AutoGen) now ships native A2A support. Effloow Lab ran a sandbox PoC with the official a2a-sdk 1.0.2 and the community python-a2a 0.5.10 library. This article shows what we found: working code, a non-obvious routing bug in the official SDK, and a workaround that gets a full Agent Card discovery + task round-trip running in under 30 lines of Python. Lab notes are in data/lab-runs/a2a-poc.md . Why A2A Matters: The Agent Interoperability Problem Before A2A, if you built a LangGraph agent and your colleague built a CrewAI agent, there was no standard way for them to collaborate.…