Authentication for AI Applications

Authentication for AI applications involves verifying both human users and AI agents, issuing short-lived, scoped, and auditable credentials to each. Modern AI apps operate as dual-principal systems, requiring the identification of user, client, and agent identities for safe authorization. There are two core authentication patterns: user-delegated agents, which operate within a user's session with consent, and autonomous machine-to-machine (M2M) agents, which function independently. These patterns address the unique authentication needs of AI, which include managing non-human identities, handling dual-principal requests, and addressing architectural diversity. AI authentication diverges from traditional web authentication by accommodating multiple identities and handling increased token volumes and lifetimes. It requires robust security measures due to the high request volumes and autonomous decision-making capabilities of AI agents. These measures include token scoping across time, resource, and action, multi-tenant isolation, and structured error responses to prevent the agents from exceeding their intended permissions and to protect against potential vulnerabilities such as prompt injection and over-scoped tokens.