They should start from the authority the agent actually needs, then decide whether it should operate under its own identity, a delegated human identity, or a tightly controlled intersection of the two. If the answer is unclear, the agent is not ready for production. Identity design must be part of the architecture, not a post-build admin task.
How should teams decide what identity an agent should use?
The decision starts with authority, not convenience. Teams should decide what the agent is allowed to do, who or what should be accountable for those actions, and where delegation is acceptable. That makes identity design part of architecture: choose the narrowest workable identity model, define boundaries for escalation, and require a clear fallback when the agent cannot safely act.
How to choose between native, delegated, and hybrid agent identity
An agent should not inherit a human identity by default just because that is the fastest implementation path. A native agent identity works best when the system needs its own lifecycle, logging, and revocation path. A delegated human identity is only appropriate when the action truly depends on a person’s authority and the resulting access stays tightly bounded and auditable.
A hybrid model, where the agent operates under its own identity but can assume limited delegated authority for specific tasks, is usually the safest compromise when the agent needs both autonomy and traceable human accountability. The key test is whether the delegation is explicit, bounded, and reversible. If the access model cannot answer that cleanly, the design is still too vague for production.
What makes an agent identity design safe enough to operate
Safe agent identity design depends on separating the agent’s standing authority from any exceptional authority it may borrow. That means the default identity should be constrained to the smallest useful scope, with short-lived elevation only when a task requires it. It also means the team must know how the agent authenticates, how its credentials are issued and revoked, and how its actions are traced back to a specific identity state.
Identity choice also affects failure mode. If the agent uses a human identity, a mistake can look like legitimate human activity and be harder to contain. If it uses a native identity, the control problem shifts to lifecycle management, policy enforcement, and proving that the agent never accumulated more privilege than intended. In both cases, ownership, review, and revocation need to be explicit, not implied.
Risk and Threat Considerations
Agent identity becomes risky when organisations treat delegation as a shortcut instead of a control design. Overbroad identity choice can turn a routine automation into a high-impact access path, especially if the agent can reach production systems, sensitive data, or administrative functions.
Failure mechanism: The agent receives an identity that is either too human, too broad, or too persistent, which makes misuse, abuse, or accidental overreach harder to detect and harder to revoke cleanly.
Impact: A compromised or misbehaving agent can act with legitimate-looking authority, expand blast radius, and create ambiguous audit trails that slow incident response and weaken accountability.
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 SP 800-53 Rev 5 sets the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Agentic AI Top 10 | ASI03 — Identity & Privilege Abuse | Agent identity choice directly governs delegated authority and privilege boundaries. |
| Recommendation — Limit each agent to the minimum identity and privilege needed for its tasks. | ||
| OWASP Non-Human Identity Top 10 | NHI-05 — Overprivileged NHI | Agent identities can become overprivileged if teams reuse human or broad service access. |
| Recommendation — Scope agent permissions narrowly and remove excess standing access. | ||
| NIST SP 800-53 Rev 5 | IA-9 — Identification and Authentication (Non-Organizational Users) | Agents operating as non-human actors need explicit authentication and controlled trust boundaries. |
| IA-5 — Authenticator Management | Agent identities depend on issuance, rotation, and revocation of their credentials and tokens. | |
| Recommendation — Authenticate the agent with a distinct identity and constrain how it is trusted. Manage agent credentials with short lifetimes and fast revocation. | ||
Practitioner Guidance
What to verify: Confirm that every agent has a named owner, a defined purpose, and a documented decision on whether it uses its own identity, delegated authority, or both. The identity choice should map to a specific business action, not to a platform default or a temporary implementation convenience.
Decision rule: If the agent needs broad or ongoing access, prefer a native identity with tightly scoped permissions. If it only needs occasional human authority, use explicit delegation with short duration and clear revocation. If you cannot describe the revocation path, the identity model is not ready.
What practitioners underestimate: The hardest part is not issuing credentials, it is proving that the agent’s authority stays aligned with intent after deployment, ownership changes, and workflow expansion.
Practitioner takeaway: The safest identity is the one that makes the agent’s authority obvious, bounded, and recoverable when something goes wrong.
Related resources from NHI Mgmt Group
- How should security teams use IAST and RASP in NHI governance?
- How can SOC teams use identity context to improve response to agent activity?
- How should security teams decide whether an AI agent gets human or non-human identity?
- How do IAM and platform teams decide whether an agent should use GraphQL at all?