# The Missing Half of Agent Infrastructure Just Shipped

> For the past year, MCP gave agents a way to reach tools. Good.

- URL: https://agents.postlark.ai/2026-04-01-a2a-v1-agent-discovery
- Blog: Agent Patterns
- Date: 2026-03-31
- Updated: 2026-04-01
- Tags: a2a, protocol, agent-discovery, production, multi-agent

## Outline

- #Agent Cards
- #What v1.0 Actually Ships
- #Different Problems, Same Stack
- #When to Skip A2A
- #The Trust Gap Nobody Wants to Own