A2A Protocol Reference

Reference skill for the Agent2Agent (A2A) Protocol, an open standard by Google / the A2A Project (Linux Foundation) for communication between independent AI agent systems.

Attribution: All specification and topic content in references/ is sourced from the official A2A repository under the Apache-2.0 license. Each file includes source attribution in its YAML frontmatter.

IMPORTANT — Use v0.3 by default. The primary references in references/v0.3/ are v0.3.0, the version currently supported by the official Go and Python SDKs and most implementations. The v1.0 RC spec is in references/v1.0-rc/ and should only be consulted when explicitly working on v1.0 features or migration planning.