A software actor that operates with permissions inherited from a human or system identity but makes its own execution choices during runtime. This concept is useful for agentic AI because it captures the security reality of autonomous action without treating the agent as a human user.
Expanded Definition
A delegated runtime principal sits between a static service account and a human user session. It is not the same as simply “a bot” or a background job. The distinguishing feature is that the actor inherits authority from an upstream identity, then uses that authority dynamically at runtime to decide which tools, APIs, or resources to invoke. In agentic AI environments, that distinction matters because an autonomous system may act within policy boundaries while still producing its own sequence of actions.
Definitions vary across vendors and implementation patterns, especially where an LLM, orchestration layer, and tool-using agent are all involved. NHI Management Group treats the concept as an identity-security pattern, not a product label. For governance, it is helpful to ask whether the runtime actor has bounded authority, whether its delegated scope can be audited, and whether the original grant remains traceable. The NIST Cybersecurity Framework 2.0 is useful here because it emphasizes managed access, accountability, and ongoing risk treatment across operational systems.
The most common misapplication is calling any automated process a delegated runtime principal, which occurs when teams ignore whether the actor actually inherits identity-bound permissions and makes independent runtime decisions.
Examples and Use Cases
Implementing delegated runtime principals rigorously often introduces tighter authorization design and more demanding audit requirements, requiring organisations to weigh autonomous execution against control over delegated scope.
- An AI coding assistant uses a developer’s approved repository permissions to open pull requests, but cannot expand its access beyond the delegated scope.
- A customer support agentic workflow retrieves tickets and drafts responses using a supervisor’s role, while preserving attribution to the initiating identity.
- An infrastructure automation agent rotates secrets and restarts services under a constrained delegated identity instead of a broad standing admin account.
- A fraud triage system queries case data and escalates suspicious activity using runtime authorization checks rather than a permanent service credential.
- An internal compliance assistant submits records to a third-party workflow system only after policy logic confirms that the delegated action remains within approved boundaries.
In practice, security teams often compare this model with agent identity patterns described in OWASP guidance for LLM applications and with broader identity governance concepts used in zero trust architectures. The important question is not whether the actor is “intelligent,” but whether each action can be tied back to an accountable grant.
Why It Matters for Security Teams
Delegated runtime principals matter because they change how security teams think about authentication, authorization, and accountability for autonomous software. If the delegated scope is too broad, an agent can move laterally, expose secrets, or perform high-impact actions far beyond the original intent. If the scope is too narrow or poorly modeled, legitimate automation breaks and teams bypass controls to restore throughput. The security challenge is therefore not to treat the agent as human, but to preserve identity traceability while enforcing least privilege, revocation, and session-bound control.
This is especially important for NHI governance, where non-human systems often need constrained access to APIs, pipelines, and operational tooling. A delegated runtime principal should have clear lifecycle rules, explicit owner assignment, and logs that show which upstream identity authorized the action. Where agentic systems are involved, runtime behavior also needs to be monitored for policy drift, unexpected tool use, and privilege escalation paths. The concept aligns with identity-centric control expectations in CISA zero trust guidance, where access is continuously evaluated rather than assumed. Organisations typically encounter this problem only after an agent overreaches during a production action, at which point delegated runtime principal handling 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 SP 800-63 and NIST Zero Trust (SP 800-207) set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST CSF 2.0 | PR.AA-01 | CSF 2.0 centres identity and access governance needed for delegated runtime authority. |
| NIST SP 800-63 | Digital identity guidance informs assurance and binding of actions to the initiating identity. | |
| OWASP Agentic AI Top 10 | OWASP agentic guidance addresses tool use and autonomy risks relevant to delegated principals. | |
| OWASP Non-Human Identity Top 10 | NHI guidance covers non-human identities that operate with delegated permissions at runtime. | |
| NIST Zero Trust (SP 800-207) | 3.1 | Zero Trust requires continuous authorization for dynamic, identity-bound runtime actions. |
Bind delegated actions to a known identity and apply suitable assurance for the session context.
