How Each Platform Models Agent Identity
The three vendors take structurally different approaches to representing an AI agent as an identity. Microsoft Entra Agent ID automatically provisions a directory identity in Microsoft Entra ID for agents built in Copilot Studio or Azure AI Foundry, placing agents alongside user and service principal objects. This lets Microsoft reuse existing Conditional Access policy, lifecycle tracking, and audit tooling for agents rather than building a parallel system.
Auth0 does not introduce a single agent identity object. Instead it composes agent support from separate services: a Token Vault for storing and exchanging third-party API tokens on an agent's behalf, an Async Authorization capability built on the CIBA standard for human-in-the-loop approval, and a Fine-Grained Authorization (FGA) service based on relationship-based access control.
Okta takes a third path, extending its existing Identity Governance capabilities, including lifecycle management and access certification, to cover service accounts, bots, and AI agents, while separately proposing Cross App Access (XAA), an OAuth-based protocol for letting agents obtain scoped access to SaaS applications without sharing credentials directly. The practical difference for architects is whether agent identity lives inside a directory they already operate, or is assembled from authorization services layered on top of existing infrastructure.
Core Technical Criteria
Credential Issuance, Rotation, and Scoping
Because Entra Agent ID treats an agent as a directory object, credential issuance and rotation follow the same mechanisms Entra already applies to service principals, and Conditional Access policies can be applied to agent sign-in and access decisions without new tooling.
Auth0's Token Vault addresses a narrower but distinct problem: storing and exchanging tokens an agent needs to call third-party APIs on a user's behalf, which is separate from authenticating the agent itself. Auth0's FGA service requires applications to explicitly model resource relationships before it can scope permissions, which is additional engineering work beyond enabling the identity platform.
Okta's Cross App Access depends on target SaaS applications implementing the protocol, so its practical coverage is limited to participating application ecosystems at any given time. Across all three platforms, credential rotation and scoping for individual tool or API calls typically still depend on the underlying secrets management or API gateway layer rather than being fully owned by the identity platform itself.
Recent Product Direction
Microsoft has positioned Entra Agent ID as the identity layer for agents created in Copilot Studio and Azure AI Foundry, emphasizing lifecycle tracking and reuse of governance policy already deployed for human and service identities.
Auth0 has published a dedicated product line, Auth0 for AI Agents, bundling Token Vault, Async Authorization, and FGA specifically for agent use cases rather than treating agents as an afterthought within existing customer identity products.
Okta has published Cross App Access as a protocol proposal for agent-to-application delegation while documenting how its existing Identity Governance capabilities extend to non-human identities including bots and agents. Exact general-availability dates for these capabilities could not be independently confirmed and should be verified against current vendor documentation, as this area is changing quickly.
Where Identity Ends and Runtime Governance Begins
Each platform solves a real part of the agent identity problem: establishing a verifiable identity, issuing and rotating credentials, and in Auth0's case, pausing for human approval at authorization time. None of the three, based on published materials, enforce authorization decisions at the point of individual tool or API invocation within an agent's execution loop, and none provide continuous logging of an agent's tool-call decisions or reasoning steps beyond standard authentication and authorization events.
Access certification and lifecycle review processes common to Entra and Okta apply to provisioning and deprovisioning, not to what an agent does with its permissions during a session. CIBA-based human approval addresses point-in-time authorization but is not equivalent to ongoing runtime policy enforcement across a multi-step agent task.
This is the layer where runtime governance, including tool approval workflows, session-level policy enforcement