The Personal Agent Protocol, an open standard being developed by Sierra with Meta for how a person's AI agent deals with companies, is changing fast and says so. Its changelog lists draft 0.1 as published on 9 October 2026 and draft 0.2 on 24 October, and warns that each 0.x version may break the one before. A promise that newer minor versions will not break older ones "now starts at 1.0". Watch, and revisit at 1.0, when that promise begins.
What broke in 0.2
Three changes in 0.2 break things that worked in 0.1. The discovery file, poppy.json, now speaks for the host that serves it, after redirects, and domains are compared ignoring only case, so a leading "www." is no longer ignored. "An issuer represents exactly one Company": a provider that hosts several companies must give each its own issuer, so they do not share user identifiers or account