Authentik

The REST API covers users (CRUD, group membership, MFA), applications (OAuth2 and SAML configuration), providers (protocol configuration), flows (authentication flow customization), and events (audit log retrieval). Agents can provision users from HR system events, configure new OAuth2 applications for internal tools, manage group membership for access control, and retrieve authentication events for compliance reporting.

Reliability for self-hosted Authentik is the team's operational responsibility. Identity provider availability is critical — Authentik downtime blocks SSO logins for all connected applications. High-availability deployment (multiple worker instances, Redis, and database replication) is essential for production identity infrastructure.

Authentik is a full-featured open-source identity provider supporting SSO, OAuth2, SAML, LDAP, and SCIM — a self-hosted alternative to Okta or Auth0 with no per-user licensing cost. Its comprehensive REST API covers the full identity management surface: users, groups, applications, providers (OAuth2, SAML, LDAP, SCIM), flows, and audit events. For agents automating identity operations in organizations self-hosting their identity infrastructure, Authentik's REST API provides programmatic access to the entire identity management lifecycle.

Authentication to the Authentik REST API uses API tokens created in the management UI or via the token creation API. Tokens can be scoped to specific permissions using Authentik's built-in permission model. Self-hosted deployments should implement network isolation for the management API to prevent unauthorized access to identity infrastructure.

Documentation is thorough and covers the API, authentication flows, and protocol configuration clearly. The flow system documentation — explaining Authentik's customizable authentication pipeline — is the most distinctive feature to understand for teams customizing their authentication UX. Teams evaluating Authentik versus Keycloak or ZITADEL for self-hosted identity should compare the API quality, UI polish, and community activity, where Authentik has grown rapidly.