Limit that pattern to cases where the target service genuinely requires a user object, then document the boundary between the agent identity and the agent user. The agent user should not be treated as a normal employee account because it does not behave like one.
When should a user-shaped account exist at all?
Use a user-shaped identity only when the application genuinely relies on user semantics, such as an actual profile, consent, ownership, mailbox, workflow inbox, or per-user entitlements. If the service only needs an execution principal, a workload or service identity is cleaner. Treat the user-shaped account as a compatibility layer, not the default design.
A useful boundary check is whether removing the human-shaped attributes would break the app, or merely make a downstream integration more awkward. If the latter, keep the agent on a non-human identity and map only the required application-facing attributes. That avoids turning an automation principal into a pseudo-employee account.
When the app really does need a user object, define the minimum viable user profile: name, role, lifecycle owner, login method, and whether the account is visible to humans, machines, or both. If you cannot explain why each field exists, it is usually being added for convenience rather than necessity.
How should the agent identity and the agent user be separated?
The agent identity should be the authority that authenticates, is audited, and is revoked. The agent user should be the application-facing representation that satisfies the target system’s user-object requirement. Document which permissions belong to the underlying agent and which, if any, belong only to the user-shaped shell.
That separation matters because a user object often inherits assumptions that do not fit automation: joiner-mover-leaver handling, human access reviews, password resets, and helpdesk recovery. If those processes apply to the agent user without modification, teams can lose control of the actual automation principal while thinking they are managing a normal account.
Where possible, keep a one-to-one mapping between the agent and its user-shaped representation, and record the ownership, purpose, and expiration criteria in the account record. If multiple agents share one user object, you should treat that as an exception requiring explicit compensating controls and a clearly defined blast radius.
What operating model keeps this pattern safe?
Use the smallest possible user surface: no interactive use unless strictly required, no standing privileges beyond the app’s needs, and no reuse of the account for general administration. The more the account starts to look like a person’s account, the more the organisation inherits human-account failure modes without human-account benefits.
It also helps to align the pattern with lifecycle control and visibility. NHIMG’s IAM and IGA Basics is useful here because it frames the difference between authentication, authorization, provisioning, and access review in a way that makes the boundary explicit. For ongoing governance, Access Reviews and Certification Guide is a practical companion for deciding how often the account should be recertified and who owns that decision.
For organisations standardising machine and agent identity patterns, Agentic AI Identity Guide helps clarify registration, delegation, and retirement, while AI Agent Authorisation Guide reinforces the principle that the agent should receive task-scoped access rather than broad user-style permissions.
Risk and Threat Considerations
User-shaped accounts can become a control blind spot when they inherit human workflows but are actually run by software. That creates excessive privilege risk, poor ownership clarity, and a higher chance that the account persists after the agent, integration, or approval path should have been retired.
Failure mechanism: The organisation manages the visible user object instead of the underlying agent, so access review, offboarding, and credential rotation do not fully constrain the real automation path.
Impact: A compromised or stale agent-user account can be reused for unauthorised application access, privilege abuse, or persistence that is harder to spot than a normal human account issue.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
OWASP Non-Human Identity Top 10 and OWASP Agentic AI Top 10 address the attack and risk surface, while NIST SP 800-53 Rev 5 sets the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-01 — Improper Offboarding | User-shaped agent accounts need explicit retirement and revocation when the agent or integration ends. |
| NHI-05 — Overprivileged NHI | A user-shaped account can quietly accumulate more privilege than the agent truly needs. | |
| NHI-10 — Human Use of NHI | A user-shaped agent account can be mistaken for a normal employee account and used like one. | |
| Recommendation — Define a retirement rule for every agent-facing account and revoke it when the agent is decommissioned. Constrain the account to the minimum privileges the app requires and review any standing access. Prevent human reuse of the account and keep its access path dedicated to the agent workflow. | ||
| OWASP Agentic AI Top 10 | ASI03 — Identity & Privilege Abuse | The question is about separating agent authority from the user-shaped account the app sees. |
| Recommendation — Separate the agent's authority from the application-facing user object and bound both with distinct controls. | ||
| NIST SP 800-53 Rev 5 | IA-5 — Authenticator Management | User-shaped accounts for agents still need controlled credential issuance, rotation, and revocation. |
| AC-6 — Least Privilege | The pattern should be limited to the minimum access the target service truly requires. | |
| Recommendation — Manage credentials for the agent-facing account as lifecycle items and rotate or revoke them promptly. Grant only the access the service needs and remove any surplus permissions from the account. | ||
Practitioner Guidance
What to prioritise: Make the agent itself the owned security object, then treat the user-shaped account as an application compatibility artifact. The first question is not “can we create a user?” but “can we explain why the target service cannot consume a non-human principal instead?”
What to verify: Confirm that the account has a named owner, a documented business purpose, a defined expiry or review cadence, and a clear rule for which actions are performed by the agent versus the app-facing user object. If any of those are missing, the pattern is too close to an ordinary shared account.
Common mistake: Letting the user-shaped account participate in the same helpdesk, reset, and recertification processes as employee accounts without extra controls. That usually increases operational convenience while weakening attribution and lifecycle discipline.
Practitioner takeaway: Use user-shaped identities only as a constrained wrapper around an explicitly governed agent, and never let the wrapper obscure who actually holds the authority, the permissions, and the offboarding responsibility.
Related resources from NHI Mgmt Group
- How do organisations compare agent identity platforms with access governance needs?
- What is the difference between human identity governance and AI agent governance?
- When does AI agent access create more risk than it reduces?
- What is the difference between governing human access and governing AI agent access?