Delegated user identity is the human identity or approval context carried into an agent-driven workflow when an AI agent acts on behalf of a user. It helps organisations distinguish the agent’s execution context from the originating user’s authority, which is essential for authorization, auditing, and accountability.
Expanded Definition
Delegated user identity is the approval and attribution context that an AI agent carries when it performs actions on behalf of a human user. It is not the same as the agent’s own technical identity, and it should be treated as a separate authorization layer within agentic workflows. In practice, this means the system must preserve who initiated the request, what scope was granted, when consent was given, and whether the agent is operating under time-bound or task-bound delegation. Definitions vary across vendors, but the security requirement is consistent: the original user’s authority must remain traceable even when execution is automated. That distinction matters for NIST Cybersecurity Framework 2.0 alignment, especially where governance, access control, and auditability intersect. In NHI programs, delegated user identity often appears alongside agent sessions, scoped tokens, and policy-enforced approvals, which is why it should be designed as an identity control rather than a logging convenience.
The most common misapplication is treating the agent’s service account as proof of user approval, which occurs when systems fail to bind the user’s delegation to the specific action and resource scope.
Examples and Use Cases
Implementing delegated user identity rigorously often introduces workflow friction, because stronger approval binding can add prompts, policy checks, and audit dependencies that slow automated execution in exchange for better accountability and containment.
- A finance agent submits an invoice approval request using the employee’s delegation, while the platform records the approver, task scope, and expiry window for later review.
- A developer agent opens a pull request on behalf of a user, but the system records which repository paths were authorized and whether the user explicitly approved code changes before merge.
- A support agent accesses ticketing and CRM tools under a delegated context, limiting the session to one customer case and preventing broader account enumeration.
- An enterprise defines a task-specific consent model where the agent can read calendar data, but cannot send messages unless the user grants a second approval step.
- NHIMG’s research on Ultimate Guide to NHIs shows how quickly unmanaged identities create security drift, and that lesson extends to delegated contexts when approvals are not tied to a measurable control boundary.
For implementation patterns, teams often compare this concept with identity federation and consent models described in SPIFFE, especially when the agent must present both its own workload identity and the user’s delegated authority. The same distinction is visible in breach analysis such as 52 NHI Breaches Analysis, where weak identity separation makes attribution and containment much harder.
Why It Matters in NHI Security
Delegated user identity is central to preventing authority confusion in agentic systems. If the delegation chain is unclear, security teams cannot tell whether an action was permitted by a person, inferred by an agent, or inherited from a broad token. That ambiguity undermines least privilege, incident investigation, and post-incident accountability. It also creates audit gaps when a delegated action must later be explained to legal, compliance, or customer stakeholders. NHIMG research shows that 90% of IT leaders say properly managing NHIs is essential for a successful zero-trust implementation, which is directly relevant here because delegated identity only works when the user context is verifiable, scoped, and revocable. Practitioners should also read this through the lens of CISA Zero Trust Maturity Model, where continuous verification is more important than static trust. Organisations typically encounter delegated identity failures only after a disputed transaction, unexpected data access, or an unauthorized agent action, at which point the concept becomes operationally unavoidable to address.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
OWASP Agentic AI Top 10 and OWASP Non-Human Identity Top 10 address the attack and risk surface, while NIST CSF 2.0, NIST Zero Trust (SP 800-207) and NIST SP 800-63 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Agentic AI Top 10 | Covers agent authorization boundaries and delegated action risks in autonomous workflows. | |
| OWASP Non-Human Identity Top 10 | NHI-01 | Identity separation and attribution are core to controlling non-human execution context. |
| NIST CSF 2.0 | PR.AC-1 | Identity proofing and access governance support trustworthy delegated access decisions. |
| NIST Zero Trust (SP 800-207) | SA-2 | Zero Trust treats each request as untrusted until identity and policy are checked. |
| NIST SP 800-63 | AAL2 | Authenticator assurance informs how strongly delegated user approval should be bound. |
Bind every agent action to explicit user consent, scope, and traceable delegation.
Related resources from NHI Mgmt Group
- What is the difference between authenticating a user and governing a cloud identity?
- Why do delegated integrations increase non-human identity risk?
- What is the difference between delegated user access and machine authority for AI agents?
- When should organisations prioritise workload identity controls over more user-focused IAM work?
Deepen Your Knowledge
Reviewed and updated by the NHIMG editorial team on August 26, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
