Delegated user access is permission the agent inherits to act on behalf of a person, usually within a defined user scope. Agent-owned NHI access is the identity the agent uses when it acts independently or reaches systems outside that delegated boundary. The two should not be collapsed into one governance rule because the accountability and scope are different.
How Delegated User Access Differs From Agent-Owned NHI Access
Delegated user access is only one branch of the broader authorization model: the agent is borrowing a person’s rights for a bounded task, so the control question is how tightly that borrowed scope is constrained and recorded. Human vs Non-Human Identity is useful here because it frames the boundary where user-centric delegation ends and machine-oriented identity begins.
Agent-owned NHI access is the agent’s own standing identity, which should be treated as a separate principal with its own lifecycle, permissions, and revocation path. That distinction matters because the same action can be acceptable when performed inside a person’s delegated scope, but high risk when performed under a persistent agent identity that can act independently across systems.
The practical dividing line is accountability. With delegated user access, you should be able to answer which user authorized the action, which scope was granted, and when that scope expires. With agent-owned NHI access, you should be able to answer who owns the identity, what systems it can reach, what secrets or trust material it uses, and how its access is reviewed or retired.
Why the Boundary Matters for Authorization, Ownership, and Offboarding
These models often fail when teams collapse them into one generic “agent access” policy. delegated access should inherit the user’s intent and usually carry tighter limits on duration, audience, and action scope, while agent-owned access should be governed like any other non-human principal, with explicit ownership and lifecycle controls. Agentic AI Identity Guide is a strong reference for the identity, delegation, registration, and retirement side of that split.
That is also why ownership and offboarding cannot be an afterthought. A delegated session can often be invalidated by ending the user grant, but an agent-owned identity may persist across workflows, environments, and retries unless it is separately inventoried and revoked. NHI Ownership and Accountability Guide and Top 10 NHI Issues both help practitioners keep ownership, overprivilege, and orphaned access from being merged into one vague control.
Scope also behaves differently. Delegated user access should be constrained to the user’s approved action space, while agent-owned NHI access should be designed with least privilege, clear boundaries, and explicit approval for any expansion. AI Agent Authorisation Guide is relevant because it maps the decision point where task-scoped delegation becomes excessive agency if it is allowed to drift into broad standing permissions.
Operational Signals That Tell You the Model Is Mixed Up
Misclassification usually shows up in three places: access review, incident response, and audit evidence. If reviewers cannot tell whether an action was performed under the user’s delegation or the agent’s own identity, then the governance model is too coarse to support accountability.
Another warning sign is when the same credential path is used for both delegated and autonomous activity. That makes it impossible to distinguish user intent from agent initiative, and it weakens revocation because you can no longer remove one without breaking the other. The cleaner pattern is to separate the identity used to impersonate or act on behalf of a user from the identity the agent uses when it operates independently.
For control design, that separation should be visible in logs, policy, and review workflows. If the access review asks only “does this agent need access?” it is already too blunt; the better question is whether the access is user-borrowed, independently owned, or transitional between the two states.
Risk and Threat Considerations
When delegated access and agent-owned identity are merged, organisations lose clarity on privilege, revocation, and incident attribution. That creates exposure because a compromised agent may appear to be acting with user authority, while a legitimate delegated action may be over-restricted if it is treated as autonomous machine access.
Failure mechanism: Scope creep, shared credentials, or token reuse blur the boundary between “acting for a user” and “acting as the agent,” so revocation, logging, and approval checks no longer map cleanly to the real principal.
Impact: Excess privilege can persist longer than intended, offboarding becomes unreliable, and investigators may be unable to prove whether a sensitive action was user-approved or independently executed by the agent.
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 |
|---|---|---|
| NIST SP 800-53 Rev 5 | IA-9 — Service Identification and Authentication | Agent-owned access and delegation both depend on non-user principals authenticating correctly. |
| AC-3 — Access Enforcement | The question is about enforcing different authorization boundaries for delegated and agent-owned access. | |
| IA-5 — Authenticator Management | Revocation and lifecycle differ when access is user-borrowed versus agent-owned. | |
| Recommendation — Use IA-9 to separate machine authentication from user-delegated access and enforce distinct credentials. Apply AC-3 to enforce different permissions for borrowed user scope and autonomous agent scope. Apply IA-5 to manage separate credential lifecycles and revoke each access path independently. | ||
| OWASP Non-Human Identity Top 10 | NHI-05 — Overprivileged NHI | Agent-owned access becomes risky when it is allowed to accumulate broader rights than its delegated task needs. |
| NHI-10 — Human Use of NHI | The boundary question centers on whether an agent is borrowing user authority or operating as its own identity. | |
| Recommendation — Limit agent-owned identities to the minimum privileges needed for their independent actions. Prevent users from collapsing delegated access and agent-owned identity into one shared governance model. | ||
| OWASP Agentic AI Top 10 | ASI03 — Identity & Privilege Abuse | The core distinction is how agent authority is granted, scoped, and abused across delegated and autonomous access. |
| ASI09 — Human-Agent Trust Exploitation | Delegated access relies on human trust that can be overextended into broader agent authority. | |
| Recommendation — Separate user-delegated privileges from autonomous agent privileges and review them independently. Constrain human approval so delegated access cannot silently expand into standing agent authority. | ||
Practitioner Guidance
What to verify: Before trusting the model, verify that delegated access and agent-owned access have different issuers, different expiry rules, and different review owners. If both paths use the same token class or the same operational workflow, the design is probably hiding a governance problem rather than solving one.
Decision rule: If the action must stay inside a person’s approved scope, treat it as delegated access with tight boundaries and short duration. If the agent needs to continue after the user session ends, crosses system boundaries, or performs repeatable autonomous work, give it a separate NHI lifecycle and review process.
Practitioner takeaway: The safest model is not “one access pattern for all agents,” but two clearly separated principals, one borrowed from the user and one owned by the agent, with different accountability and revocation paths.
Related resources from NHI Mgmt Group
- What is the difference between offboarding a user and revoking NHI access?
- What is the difference between proxying delegated access and giving an AI agent the user’s access token directly?
- What is the difference between ephemeral agent identities and traditional access reviews?
- What is the difference between human access assumptions and agent access assumptions?