poses</li> </ul> <h2 id=2-authentication>2. Authentication<a class=headerlink href=#2-authentication title="Permanent link">&para;</a></h2> <p>Authentication is the process of verifying the identity of an entity (in this case, an AI agent or web service). The UIM Protocol uses Policy Adherence Tokens (PATs) as the primary authentication mechanism.</p> <h3 id=21-policy-adherence-tokens-pats>2.1 Policy Adherence Tokens (PATs)<a class=headerlink href=#21-policy-adherence-tokens-pats title="Permanent link">&par