A delegated actor is a child identity that performs work on behalf of a parent session but does not automatically inherit the parent’s full authority. In agent systems, the child must be governed as a separate execution principal with its own consent state, scope and audit trail.
Expanded Definition
A delegated actor is not just a “subtask” or a background worker. In NHI and agentic systems, it is a child execution principal that acts under a parent session while keeping its own consent state, scope, and audit trail. That distinction matters because authority is intentionally split: the parent may initiate or authorize work, but the child should only receive the permissions needed for its assigned action. In practice, this aligns with the least-privilege logic described in the NIST Cybersecurity Framework 2.0, even though no single standard yet fully settles how delegated actors should be modelled across agent platforms.
Definitions vary across vendors when a delegated actor can call tools, create more children, or persist beyond the original session. NHI Management Group treats those as separate governance decisions, not default capabilities. The parent-child relationship should be explicit, time-bound, and revocable, especially when the child can touch secrets, data, or external systems. The most common misapplication is treating a delegated actor as a mere function call, which occurs when engineering teams inherit the parent’s full privileges into the child’s runtime context.
Examples and Use Cases
Implementing delegated actors rigorously often introduces coordination overhead, requiring organisations to weigh faster automation against tighter authorization boundaries and more detailed logging.
- An AI agent opens a delegated actor to draft a customer response, but the child can only read ticket data and cannot send messages without separate approval.
- A workflow engine spins up a delegated actor for invoice validation, with a short-lived token that expires when the task completes.
- A build pipeline creates a delegated actor to fetch deployment metadata, while Ultimate Guide to NHIs highlights how quickly non-human access becomes risky when rotation and visibility are weak.
- A support copilot uses a delegated actor to query internal systems, but the child must log every tool call independently for later review.
- In a federated setup, a delegated actor receives a narrowly scoped credential from the parent session, then exchanges it for a different token under NIST Cybersecurity Framework 2.0-aligned controls.
Why It Matters in NHI Security
Delegated actors matter because they prevent parent session authority from spreading invisibly across machine-to-machine interactions. Without clear separation, organisations create hidden privilege chains that are difficult to review, rotate, or revoke. That is a familiar pattern in NHI failures: Ultimate Guide to NHIs reports that 97% of NHIs carry excessive privileges, which shows how often scope creeps beyond what the workflow actually requires.
For security teams, the governance question is not whether the parent session is trusted, but whether each delegated actor has its own lifecycle, consent boundary, and evidence trail. This becomes especially important in agent systems where a child principal may interact with secrets, invoke tools, or chain into additional actions. If the child inherits too much authority, one compromised step can turn into a broader incident. Organisations typically encounter the operational necessity of delegated actor controls only after an audit gap, privilege escalation, or session replay exposes actions that could not be tied back to a distinct child identity.
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 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Agentic AI Top 10 | Agentic systems must constrain child agents to explicit scope and authority. | |
| OWASP Non-Human Identity Top 10 | NHI-01 | Delegated actors are NHI principals that require unique identity and lifecycle controls. |
| NIST CSF 2.0 | PR.AA-01 | Identity proofing and access authorization must be distinct for each execution principal. |
Treat each delegated actor as a separately governed agent with bounded tools, consent, and auditability.
