MCP + A2A Thanks to Skills: The Complete Protocol Stack Your Multi-Agent System Needs

MCP gives your agent tools. A2A lets your agents talk to each other. Skills make both manageable. Here’s how the three layers work together. The Problem: Your Agents Can’t Collaborate You’ve built a trading agent. It analyzes stocks, monitors sentiment, and proposes trades. You’ve built a calendar agent. It schedules meetings, manages availability, and sends reminders. You’ve built an email assistant. It drafts replies, categorizes messages, and flags urgency. Three agents. Three separate systems. Zero collaboration.