AGNTCon + MCPCon Europe 2026

A2A Protocol v1.0 is the first stable, production-ready release of the open standard for agent-to-agent communication — marking the transition from a protocol you could experiment with to a foundation organisations can commit to with confidence.

This talk is delivered by two maintainers who helped shape the release. We cover what changed from v0.3 and why: the deliberate choice to prioritise maturity over reinvention, new enterprise capabilities — signed Agent Cards, multi-tenancy, modern OAuth flows, and a web-aligned architecture — and the breaking changes that were unavoidable on the path to a durable standard.

We also cover the SDK story: how official SDKs support v1.0 while maintaining backward compatibility with v0.3, and a per-interface versioning strategy that makes progressive migration practical rather than a forced cutover.

Finally, we look at extensibility: how extensions add capabilities while keeping a stable core, and how custom protocol bindings let implementations replace the default transport while preserving A2A semantics.

If you are building on A2A today or evaluating it, this talk gives you a clear picture of what changed, why, and how to migrate.