Chain of custody for delegated action is the record that preserves who authorised an agent’s purpose, what data it could touch, and how that approval carried through each hop. In agentic systems, this is what turns a sequence of tool calls into an accountable decision path rather than an opaque workflow.
Expanded Definition
chain of custody for delegated action is the evidence trail that shows who granted an agent authority, what scope was approved, and how that authority was preserved or changed across each downstream step. In NHI and agentic AI environments, it covers the original approval, any delegation chain, data boundaries, tool access, and the identity context attached to every execution hop.
This concept is broader than a simple audit log. A log may show that an agent called a tool, while a custody record shows why that call was allowed, which principal authorised it, whether the approval was time bound, and whether the agent remained within policy as it used credentials, tokens, or other secrets. That distinction matters when an autonomous workflow crosses systems, teams, or trust zones. The closest governance analogue is chain of custody in incident handling, but here the protected object is delegated authority rather than physical evidence. Definitions vary across vendors, and no single standard governs this yet, so organisations should treat it as a control pattern rather than a fixed product feature, aligned where possible to the NIST Cybersecurity Framework 2.0.
The most common misapplication is confusing a workflow transcript with custody evidence, which occurs when teams can see task steps but cannot prove which approval, scope, or credential lineage authorised them.
Examples and Use Cases
Implementing chain of custody for delegated action rigorously often introduces operational friction, requiring organisations to weigh automation speed against the overhead of preserving verifiable approval context.
- A procurement agent receives a 15-minute JIT delegation to query vendor pricing, and the custody record captures the approver, expiry time, and allowed data fields.
- An incident-response assistant is allowed to read only ticket metadata, with the record showing that a human analyst approved the scope before each tool invocation.
- An internal coding agent uses a scoped token to open pull requests, and the custody trail links that token to the service owner, environment, and policy condition that issued it.
- A customer-support agent summarizes account history after temporary elevation, with evidence showing the delegation was narrowed once the customer-identifying data was masked.
- After a compromised credential is investigated, analysts correlate delegation records with the exposed secret to determine whether the agent or an attacker first exercised the authority. See NHIMG research on the DeepSeek breach and the LLMjacking threat pattern.
For implementation patterns, teams often map custody data to control evidence requirements in the NIST Cybersecurity Framework 2.0 and preserve the decision trail alongside the agent’s execution record.
Why It Matters in NHI Security
When delegated action lacks a defensible custody trail, organisations cannot reliably prove whether an agent stayed inside its authority, whether a token was overused, or whether a human approver set the wrong scope. That gap becomes especially dangerous in environments where secrets, API keys, and service credentials are shared across automated workflows. NHIMG research shows that when AWS credentials are exposed publicly, attackers attempt access within an average of 17 minutes, which makes a weak delegation record a fast path from exposure to misuse. The point is not just detection; it is attribution of authority.
A proper custody trail supports incident response, compliance review, and post-incident reconstruction. It helps security teams answer questions about who approved access, when that approval expired, and whether downstream actions remained within policy. It also reduces disputes between application owners, platform teams, and governance functions when an agent’s action is challenged after the fact. The same discipline that protects secrets in the State of Secrets in AppSec becomes essential once delegated authority is executed by software rather than a person.
Organisations typically encounter the need for chain of custody only after an agent has accessed the wrong system or abused a compromised credential, at which point the custody record 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 Non-Human Identity Top 10 address the attack and risk surface, while NIST CSF 2.0 and NIST Zero Trust (SP 800-207) set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-02 | Delegated action custody depends on controlling secret exposure and scope drift across NHI workflows. |
| NIST CSF 2.0 | PR.AC-4 | Least-privilege access and authorization tracking underpin delegated action custody records. |
| NIST Zero Trust (SP 800-207) | Zero trust requires continuous verification of identity, context, and authority at every hop. |
Record approvals, scope, and expiry for each delegated action to support least-privilege reviews.
Related resources from NHI Mgmt Group
Deepen Your Knowledge
Reviewed and updated by the NHIMG editorial team on June 10, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
