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Monitoring can show what an AI agent did; it cannot, by itself, prove who the agent was acting for or whether that action was authorized. To make delegation verifiable, an organization needs to connect a distinct agent identity to a principal, constrain the agent’s authority, and preserve evidence that lets systems check that connection later. Logs are part of that design, not a substitute for it.
What monitoring can—and cannot—establish
Monitoring records activity: requests, tool calls, data changes, errors, and outcomes. Those records can help operators investigate incidents and understand an agent’s behavior. But a log entry saying that an agent called an API does not automatically establish that the entry is trustworthy, identify the agent cryptographically, show who delegated authority to it, or prove that the call fell within that authority.
These are separate questions:
- Identity: Which non-human workload or agent made the request?
- Principal: Which user, service, or system was the agent acting on behalf of?
- Authorization: What actions and resources was the agent permitted to use?
- Evidence: Can a verifier connect the action to the identity and delegation that were in force at the time?
NIST’s National Cybersecurity Center of Excellence (NCCoE) concept paper, Accelerating the Adoption of Software and AI Agent Identity and Authorization (February 2026), treats identity, authorization, delegation, logging, transparency, and data-flow provenance as related but distinct concerns. Its stated goals include linking user identities to agents for delegation accountability and linking automated actions to non-human identities for visibility. The paper describes a planned project and solicits feedback; it is not a completed certification or final standard.
Why a shared API key is not a delegation chain
A static API key or bearer token is generally usable by whoever possesses it. If several agents, services, or people share one credential, seeing that credential in a request does not tell an investigator which actor actually used it or on whose behalf. A credential may also grant more access than a particular task needs.
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NIST’s September 2026 article, Back to the Future: Why Agentic AI Needs a Strong Identity Foundation, warns that API keys can provide broad, unscoped access and do not establish granular authorization for an agent. It also cautions that adopting newer authorization mechanisms does not, by itself, produce least privilege: policy quality, scope, and credential lifecycle still matter.
| Approach | What it can establish | What it does not establish on its own |
|---|---|---|
| Activity monitoring and logs | Recorded events and outcomes, subject to the integrity and completeness of the logging system | That the recorded actor was authentic, that a principal delegated authority, or that the action was permitted |
| Shared static key or bearer token | Possession of a credential accepted by a service | Which agent or principal used it, whether the credential was stolen, or whether its access was appropriately narrow |
| Distinct workload identity plus authorization | A basis for identifying a workload and evaluating an access decision | A complete, independently verifiable chain from principal through delegation to each action, unless the system records and protects that evidence |
| Identity-linked delegation evidence and protected action records | A basis for checking who delegated what authority to which agent and whether an action corresponded to that grant | Correct policy, uncompromised keys, trustworthy issuance and verification, or proof that the agent’s result was beneficial |
What cryptographically verifiable delegation needs
At a minimum, a verifier needs evidence connecting the principal, agent, grant of authority, and action. Cryptography can help protect that evidence against alteration and impersonation, but only if identities and keys are managed correctly and the verifier checks the relevant policy and context. The NIST material identifies the goals and relevant building blocks; it does not prescribe a single delegation-chain format.
1. A distinct identity for the agent
The agent should have an identity separate from the human or system on whose behalf it acts. NIST describes unique identifiers, credentials, and entitlements bound to the identity of the user or system operating an agent. A service should be able to distinguish an agent workload from a shared user account or a generic application key.
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The delegation record needs to identify the principal and the agent, rather than relying on an operator to infer the relationship from timestamps or application logs. NIST’s NCCoE concept paper says: “Link specific user identities to AI agents or software systems to support effective delegation controls and maintain accountability for the actions of automated systems.”
3. Bounded authority
A grant should make clear which resources and actions are allowed, and for which audience or service it is intended. A delegation that merely says “act for this user” is too broad to explain whether a particular operation was permitted. Scope restrictions and audience limits reduce the consequences of a leaked credential and give verifiers something concrete to evaluate.
4. Protected, attributable action records
Records should connect an action and its outcome to the non-human identity and the authority under which it ran. NIST’s NCCoE paper calls for systems to “Link specific AI agent and software systems actions to the identity of the non-human entity and enable effective visibility into the actions taken, data generated, and outcomes of automated activities within a given system, platform, or network.” A record is useful for later verification only if the system also protects its integrity and retains the information needed to check the identity and grant.
5. Verification and lifecycle controls
Verification must do more than check that a token or signature exists. The relying service needs to validate the credential, issuer or signing key, intended audience, scope, and relevant validity or revocation state. Issuers need sound key management, and credentials need managed issuance, expiry, rotation, and revocation. NISTIR 8587, published September 15, 2026, addresses token and assertion protection and recommends attention to key management, token verification, and lifecycle controls. It is relevant security context, not an AI-agent delegation specification.
Where existing identity standards fit
There are useful building blocks, but no single named technology should be treated as a complete, universal agent-delegation solution.
- OAuth 2.0 and related extensions provide authorization mechanisms that can support scoped access and delegation patterns.
- OpenID Connect (OIDC) provides identity-related information alongside OAuth-based flows; it does not by itself define every detail of agent delegation.
- SPIFFE and SPIRE address workload identity: SPIFFE is a framework for cryptographic workload identities, while SPIRE is an implementation that provides workload attestation APIs.
- SCIM and NGAC are among the other standards or practices considered relevant in the NCCoE concept paper, but their presence in that list is not an endorsement of a complete agent identity architecture.
A practical system may combine workload identity, an authorization protocol, policy evaluation, and protected audit records. The exact choice depends on the environment and threat model. OAuth, OIDC, SPIFFE/SPIRE, or monitoring alone should not be described as proving an end-to-end delegation chain unless the implementation actually connects and verifies the necessary identities, grants, and actions.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to assess a proposed implementation
When reviewing a design, trace one consequential action backward from the target service to the authority that permitted it. Ask:
- Can the target distinguish this agent workload from other agents and from the user or service that invoked it?
- Can it identify the principal and the specific delegation that authorized the agent?
- Does the authorization limit actions, resources, and intended audience rather than granting broad standing access?
- Can a verifier detect an altered record or an invalid, expired, or revoked credential?
- Can an incident responder establish which identity and grant were in force when the action occurred?
- Are credentials issued, rotated, and revoked through a defined lifecycle rather than left as long-lived secrets?
A “yes” based only on a dashboard or a log label is not enough: look for the underlying identity, policy decision, credential checks, and integrity protections that make the answer verifiable. These checks assess the design; they are not evidence that a particular implementation has passed a security test.
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Human approval can add a control for high-impact actions, but it does not replace identity or scoped authorization. NIST’s September 2026 guidance also cautions that excessive prompts can produce consent fatigue and reflexive approval. Use approval where the risk justifies the interruption, and keep the agent’s granted access bounded whether or not a human is asked to confirm a specific action.
The agent identity landscape is still evolving
NIST’s AI Agent Standards Initiative, created February 17, 2026 and updated August 14, 2026, describes voluntary guideline work, industry-led standards, and research into agent authentication and identity infrastructure. The agent-specific ecosystem is therefore developing. Existing identity and authorization standards can support parts of a solution, but organizations still need to define how their own systems connect principal, workload, grant, and action—and how that evidence is verified.
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