How to Authenticate AI Agents in B2B SaaS: Delegated Auth, Scoped Tokens, and Audit Trails

The article examines common but risky authentication patterns for AI agents in B2B SaaS products—hardcoded API keys, shared service accounts, and trust-based architectures—explaining how each fails to provide proper user-level identity, tenant isolation, and auditability. It advocates for delegated authentication with scoped tokens and audit trails to ensure agents act with verifiable, per-user, per-tenant authorization when accessing external services like Notion.