Glossary

Term	Meaning
User	The person for whom a personal agent acts.
Personal Agent	Software acting for one user when interacting with a company.
Company	An organization publishing PAP discovery and one or more interaction paths.
poppy.json	The discovery document at /.well-known/poppy.json.
User ID	A stable, opaque identifier for one user and one company issuer. It is not PII.
Session	One user's activity at one company through one personal agent.
Session Token	A short-lived, opaque credential for a session.
Account Token	A long-lived refresh credential representing approved account access.
DPoP proof	A per-request proof that the caller holds the key bound to a token.
Company Agent	The company's conversational agent advertised by discovery.
Operation	A durable, revisioned proposal for an action requiring confirmation.
PAP extension	An optional, wire-negotiated capability such as operations.
Reactor extension	A package of runtime plugins that can contribute SDK behavior.

The upstream specification is authoritative when terminology here and the draft specification differ.