Everything the Agent Card spec does not say out loud.
Field-level guides to A2A discovery, written against the v1.0 specification and kept in step with it. Each one ends where it should: in a tool that checks your work.
A2A vs MCP: two protocols solving two different problems
Compare A2A vs MCP: what each protocol connects, where they overlap, and why production AI agent systems often use both for tools and agent collaboration.
How to create an agent.json file for A2A v1.0
Learn how to create an agent.json file for A2A v1.0, including required Agent Card fields, the well-known URL, response headers, and common mistakes.
Publishing an Agent Card from ADK, LangGraph, CrewAI or Semantic Kernel
Learn how to publish an A2A Agent Card from Google ADK, LangGraph, CrewAI, or Semantic Kernel by mapping framework concepts to standard discovery fields.
Agent Card validation errors explained, one by one
Diagnose every A2A v1.0 Agent Card validation error and warning, understand what triggers it, and apply the exact fix in validator check order.
What A2A v1.0 changed in the Agent Card
Learn how A2A v1.0 changes Agent Cards, from supportedInterfaces and required skill tags to removed fields, with practical v0.x migration examples.