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Not by showing that an AI agent had a credential. To make a credible case about what it was authorized to do, connect the person or organization that delegated authority to the agent, the grant’s precise limits, any required approval, and a record of the exact action and outcome. Check permission when the operation runs; access to a tool or token alone does not establish permission for every action it can perform.
What would it take to prove what an agent was authorized to do?
For each consequential operation, an organization needs to be able to reconstruct a chain of authority: who or what principal delegated authority, which agent acted, what the grant allowed, whether a person approved the specific operation when required, and what the agent actually did.
This is stronger than a log entry saying an API key or service account was used. A bearer token or static API key does not, by itself, identify the person or agent that used it or establish that a particular action was authorized. Shared credentials make that attribution problem worse. NIST’s February 2026 concept paper identifies agent identity, delegated authority, and verifiable records as open challenges rather than solved problems. NIST NCCoE’s concept paper
What should the authorization record connect?
There is no single standardized record format established by the cited guidance. As a practical evidence checklist, retain enough linked information to reconstruct the decision and execution for each consequential action:
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- Principal: the person or organization that delegated authority.
- Agent identity: the agent and workload identity that acted, rather than only a shared credential.
- Grant: the permitted actions, resources, conditions, and scope.
- Validity: when the grant began, expired, or was revoked.
- Decision: the policy version and authorization decision applied at execution time.
- Approval: whether a person approved the specific action when policy required it.
- Execution: the action, target, downstream identity or system, execution context, and outcome.
- Correlation: a link joining the delegation and authorization decision to the execution record.
NIST raises the need to bind agent identity to human identity and to make logs tamper-proof and verifiable. An operational audit trail can help investigate and demonstrate what happened, but an ordinary log is not automatically conclusive legal proof. NIST NCCoE’s concept paper NIST NCCoE’s project resource hub
How should an organization limit an agent’s authority?
Give each agent an attributable identity
A distinct identity for an agent or workload makes it easier to tell which actor invoked a downstream system. OAuth 2.0 and SPIFFE address parts of enterprise identity and authorization, but credentials alone do not settle the question of who authorized a particular agent action. NIST’s September 2026 commentary stresses binding agent identity to a human and scoping delegated rights. NIST: “Back to the Future: Why Agentic AI Needs a Strong Identity Foundation”
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Delegate only the permissions needed
Make the grant specific to the useful actions and resources, and preserve its conditions and validity period. Carry the user’s authorization scope into downstream systems rather than letting an agent’s broad standing access silently substitute for the user’s rights. OWASP’s 2025 Excessive Agency guidance recommends minimum necessary privileges and logging and monitoring extension activity. OWASP: LLM06:2025 Excessive Agency
Recheck permission at the point of action
An agent being allowed to call a tool does not mean it is allowed to perform every operation available through that tool. The execution component should check authorization for the exact action and target, including any required approval, when the operation is about to run. This catches changes in scope, policy, or grant status that a one-time access decision may miss. OWASP AI Agent Security Cheat Sheet
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When should a person approve an agent’s action?
Use explicit human approval for high-impact or irreversible operations. Present an action preview so the approver can see what will happen before it executes; a general permission to use a tool is not the same as approval for a consequential transaction. OWASP recommends approval gates, previews, audit trails, and authorization checks tied to the exact action. OWASP AI Agent Security Cheat Sheet
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Are there established standards that prove agent authorization end to end?
The available NIST material describes active work and possible building blocks, not a universally adopted end-to-end standard that proves every agent action was authorized. NIST’s February 2026 document is a project concept paper, not a final standard; it poses questions about proving authority for a specific action, delegation on behalf of a person, binding human and agent identities, and verifiable logs. NIST NCCoE’s concept paper
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NIST’s summary of comments discusses DPoP or mutual TLS with workload identities as possible building blocks. It also notes that agent-specific profiles still need to bind identity to workload, execution context, transaction, and delegation chain. These approaches should be understood as mechanisms under discussion, not proof that a complete standard is already in place. NIST NCCoE’s project resource hub
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