They should require a single evidentiary view that links the initiating identity, each delegated identity, and the final system action. Without that chain, each platform may look correct on its own while the overall transaction remains impossible to prove.
Why cross-system agent workflows need one evidence chain
When an agent workflow crosses multiple identity systems, the technical control question is no longer just “did each platform authenticate correctly?” It becomes whether you can show a continuous chain from the original initiator, through every delegated identity or token exchange, to the final action taken in the target system. Without that chain, auditability breaks even when each hop looks valid in isolation.
This is especially important in delegated and multi-hop flows, where an agent may act on behalf of a user, then use a separate credential or trust boundary in another platform. The security issue is not only access, but provenance: who started the transaction, who delegated authority, and which identity actually exercised the final privilege.
What the evidentiary view has to contain
A single evidentiary view should tie together the initiating identity, each intermediate delegated identity, the token or assertion used at each handoff, and the final system action. That view should be readable as one transaction story, not as disconnected logs from separate platforms. If any hop is missing, the organisation cannot confidently distinguish legitimate delegation from misuse, replay, or unauthorised privilege expansion.
For practitioners, this means treating identity transitions as first-class events rather than side effects. Cross-system workflows often involve different logging schemas, different notions of actor and subject, and different retention windows, so the evidentiary design has to normalise those differences into one traceable record. The Agentic AI Identity Guide is useful here because it frames delegation, registration, authentication, and retirement as a lifecycle rather than isolated access events.
How to govern delegated identity across platforms
The practical governance test is whether every system in the chain can answer the same three questions: who initiated, who was authorised to delegate, and what final action was performed. If one platform can only show local approval while another holds the execution record, the organisation still lacks end-to-end accountability. That is the point where evidence stitching, not just access control, becomes the control objective.
Cross-system evidence also needs to be resilient to identity reuse and shared tooling. Agent workflows frequently move through APIs, service principals, or other machine-mediated identities, so the record must distinguish the human sponsor, the agent or delegated identity, and the technical credential that actually touched the destination system. The Ultimate Guide to NHIs helps anchor that distinction between the identity entity and the secrets or tokens that enable it.
What good looks like in practice
Good practice is a transaction trail that survives platform boundaries. The trail should let you reconstruct the handoff sequence, prove whether the delegate acted within its authority, and identify the exact action that changed state in the target system. If the organisation cannot produce that reconstruction on demand, it has a governance gap even if its controls were technically enforced at every hop.
That reconstruction becomes much stronger when the evidence model includes lifecycle events such as provisioning, rotation, and offboarding for the identities involved. A workflow may be legitimate today and unsafe tomorrow if delegated identities outlive their purpose or if a credential is reused outside its intended scope. The NHI Lifecycle Management Guide is a natural reference point for the lifecycle discipline behind that kind of assurance.
Risk and Threat Considerations
Cross-system workflows create a visibility gap that attackers and auditors both exploit. A platform can appear compliant locally while the end-to-end transaction still hides overprivilege, credential replay, or an unauthorised handoff between identities.
Failure mechanism: Each identity system records only its own segment of the workflow, so the organisation cannot reliably prove delegation lineage, detect identity reuse, or separate legitimate on-behalf-of action from abuse of trust.
Impact: Incident response, forensics, and audit all degrade because the organisation cannot reconstruct who caused the final action, which credential enabled it, or whether the delegation path exceeded its authority.
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 | Cross-system agent delegation hinges on identity continuity and privilege use. |
| Recommendation — Bind each delegated action to the originating authority and restrict identity switching. | ||
| OWASP Non-Human Identity Top 10 | NHI-09 — NHI Reuse | Identity reuse across systems can obscure which actor performed the final action. |
| Recommendation — Prevent reused machine identities from spanning unrelated workflows without traceable lineage. | ||
| NIST SP 800-53 Rev 5 | AU-3 — Content of Audit Records | The question centers on proving a complete action chain across systems. |
| IA-5 — Authenticator Management | Delegated workflows depend on managing the credentials or tokens that enable each hop. | |
| AC-6 — Least Privilege | Each delegated identity should hold only the authority needed for its step. | |
| Recommendation — Record initiator, delegation steps, and final action in correlated audit events. Rotate, protect, and scope authenticators used in cross-system delegation. Limit each delegate to the minimum permissions needed for its workflow step. | ||
Practitioner Guidance
What to verify: Confirm that every workflow crossing identity boundaries produces a correlated record for initiator, delegate, credential or token exchange, and final action, all tied to one transaction identifier.
Common mistake: Treating platform-level logs as sufficient evidence when the real control requirement is end-to-end traceability across systems.
What good looks like: A reviewer can answer, from one evidence set, who started the workflow, how authority was delegated, and what the target system actually executed.
Practitioner takeaway: In multi-system agent flows, the real control is not just authentication at each hop, but provable continuity of authority from initiation to outcome.
Related resources from NHI Mgmt Group
- How can organisations reduce the blast radius of compromised agent identities?
- Where does cross-environment agent discovery fit in an IAM programme?
- How should organisations handle homegrown IAM systems that still power core identity workflows?
- How should organisations handle password reset workflows in identity systems with legacy access management dependencies?