I analyzed 3 A2A approaches. 2 already failed. Here's what's actually missing.

I've been obsessing over agent-to-agent communication for weeks. Here's what public case studies reveal and why the real problem isn't the tech. TL;DR: Google's A2A is solid engineering but stateless agents forget everything. Moltbook went viral then collapsed (fake agents, security nightmare). The actual missing layer is identity + privacy + mixed human-AI messaging. Nobody's built it right yet. Google's A2A: Technically solid, fundamentally limited Google launched A2A in April 2025 with 50+ founding partners.