Auth0 for AI Agents secures agents acting on behalf of your users: token vault, fine-grained authorization, MCP auth. AgentID gives agents their own cross-app identity with owner accountability. They meet in the middle: AgentID plugs into Auth0 as an OIDC connection.
What is Auth0 for AI Agents?
Auth0 for AI Agents is Okta's product line for securing AI agents, aimed at teams who want to "ship more secure AI agents, faster". It has three pillars. Agent identity and authentication lets you "identify your AI agents, define who they represent, and establish how they're held accountable," anchoring autonomous actions to a verified user identity with audit trails. Token Vault manages the third-party credentials agents use, so "sensitive third-party keys never touch your code or logs," with automated rotation. Fine-Grained Authorization for RAG checks document permissions at retrieval time so an LLM only sees what the authenticated user may access.
The platform builds on OAuth 2.1 and OIDC, and for MCP servers provides "standards-based discovery and client registration, resource-scoped tokens, permission downscoping through token exchange". Auth for MCP is generally available; Agent as Principal is listed as coming soon. Pricing is "free to build," then priced on active agent identities.
The center of gravity is delegation. Auth0 for AI Agents assumes the human is your user, inside your Auth0 tenant, and secures the agent acting as that human against your app and the third-party services it reaches.
What is AgentID?
AgentID is a "Sign in with AgentID" button for agents, a standard OpenID Connect provider run by AgentMail. The agent authenticates as itself with its own signing credential, which never leaves the agent. The app receives an ES256-signed id_token with a stable subject and the agent's verified inbox address.
Accountability comes through registration: a registered client (one RFC 7591 call, authenticated with an AgentMail API key) can request the owner_email scope and read the owner's address from the userinfo endpoint after the code exchange. If the agent has not granted owner visibility, the sign-in fails with a 403 rather than returning a token missing the claim. AgentID is free for apps.
The nuance: two Auth0s
Auth0 is both a competitor and a distribution channel here, and the distinction is between SKUs. Auth0 for AI Agents, the product described above, competes with AgentID on the question of agent identity. Auth0 the identity platform is something AgentID plugs into: apps running Auth0 can add AgentID as an enterprise OpenID Connect connection and start accepting agent sign-ins through the dashboard they already use. If your login box is Auth0, adopting AgentID is configuration, not migration.
Side-by-side
| AgentID | Auth0 for AI Agents | |
|---|---|---|
| For | Apps accepting agent sign-ins from anywhere; agent developers | Teams building agents on top of their own Auth0-secured apps |
| Cross-app support | Yes, any OIDC-capable app; identity is portable across unrelated services | Scoped to your applications and the third-party APIs your agents call |
| Owner email support | Yes, owner_email scope via userinfo, 403 on missing grant | Agents are tied to your existing users; identity of outside agents' owners is not the model |
| Standards support | Standard OIDC: code flow + PKCE (S256), ES256, RFC 7591 | OAuth 2.1 and OIDC; token exchange, resource-scoped tokens for MCP |
| Pricing | Free for apps | Free to build, then priced on active agent identities |
| Time to integrate | Minutes on an existing OIDC stack; two config values | An Auth0 deployment plus SDK integration per framework |
| Who owns the identity root | AgentMail inbox controlled by the agent's owner | Your Auth0 tenant |
When to choose Auth0 for AI Agents
Choose it when you are building the agent and the human it serves is already your user. If your product ships an assistant that reads customers' calendars, calls their SaaS tools, and queries permission-sensitive documents, Auth0's pillars map directly onto your risks: vaulted third-party tokens, retrieval-time authorization, MCP auth that passed security review. Teams already on Auth0 get all of this inside the platform they know.
It stops at identity in one specific sense: the identities involved are your users and your agents. It has no opinion about an unknown agent showing up at your login page from someone else's infrastructure, and no email or communication layer attached to the identities it manages.
When to choose AgentID
Choose AgentID when agents arrive from outside. A SaaS product seeing automated signups, a marketplace wanting to cap accounts per human, an API wanting to welcome disclosed agents with real rate limits: these need the agent to carry its own verifiable identity and a pointer to its owner. That is what the button provides, with no relationship between the agent's infrastructure and yours.
AgentID identities also come with something an authorization platform does not provide: each agent's identity is anchored to a working AgentMail inbox, so the identity that signs in is also an address you can email. Identity extends into a communication channel rather than stopping at the credential.
If you run Auth0, this is not either-or. Add AgentID as an enterprise OIDC connection and keep Auth0 for AI Agents for the agents you build yourself.
Get started
If your app runs Auth0, add AgentID as an enterprise OpenID Connect connection from your dashboard. Otherwise, point any OIDC stack at issuer https://auth.agentid.com. Guides at auth.agentid.com/docs.
