Give an AI agent a task-bounded grant: identify the user or system authorizing the work and the agent separately, limit access to the required resources and actions, expire the grant by the task deadline, and provide a tested way to cancel it early. Record the grant and the agent’s actions. OAuth standards provide useful building blocks, but they do not prescribe one universal agent policy or a correct lifetime for every task.
What a safe delegation should specify
Treat delegation as an authorization lifecycle, not just a token setting. Before an agent acts, define who authorizes the work, which agent receives authority, what it may do, where it may do it, when its authority ends, and how cancellation will be enforced.
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- Delegator: the human or system authorizing the task.
- Agent: a separately identified principal that performs the work.
- Resource and audience: the API, service, tenant, account, or data set for which the grant is valid.
- Permitted operations and boundaries: actions such as read or update, plus enforceable limits on records, folders, amounts, recipients, or other arguments.
- Validity and cancellation: a start and expiry tied to the approved task, plus a mechanism to end access sooner.
- Accountability: a delegation identifier and records connecting authorization to the agent’s actions.
A useful test is whether an operator can answer, from the authorization record, who approved the work, which agent acted, what it was permitted to do, and whether the grant is still valid.
Keep the user and agent as separate identities
Do not give an agent a user’s password or treat the user’s broad personal session as a substitute for delegation. Give the agent its own identity and credentials, and preserve the authorizing user or system as a distinct identity in the authorization context and logs. This supports accountability without making the agent indistinguishable from the person whose authority it uses.
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OAuth 2.0 Token Exchange (RFC 8693) distinguishes delegation from impersonation. In its terminology, the subject token represents the party on whose behalf a token is requested, while the actor token represents the actor receiving delegated rights. Under delegation, the actor remains its own principal and acts for the subject; impersonation instead represents the actor as the subject. Token exchange does not guarantee that every authorization server will issue a token containing both identities. Check the provider’s behavior and confirm that downstream services can use the identity information they need.
NIST’s 2026 agent identity guidance similarly recommends unique agent identifiers, credentials, and entitlements associated with the user or system operating the agent. Its NCCoE concept paper describes areas for exploration, including agent identification and delegation accountability; it is exploratory work, not a finalized agent-specific delegation standard.
Define the permission envelope before issuing credentials
Write down the allowed work before creating or exchanging a credential. A broad role or static API key may grant more authority than a single task requires. Prefer a grant scoped to the intended resource and operations, and add object- or argument-level constraints when the service can enforce them.
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- Resource or audience: identify the intended API or service, and narrow further to a tenant, account, or data set where supported.
- Operations: name the required actions, such as reading specified records or updating a particular project. Avoid granting delete, send, or administrative powers unless the task needs them.
- Object and argument boundaries: restrict which records, folders, amounts, recipients, or other parameters the agent can affect.
- Human approval points: require confirmation or step-up authorization for sensitive actions that should not proceed autonomously.
- Further delegation: decide whether the agent may delegate work. If it can, require each child grant to stay within the parent grant’s authority and expiry.
RFC 8693 supports identifying a target resource or audience in a token-exchange request. OAuth Rich Authorization Requests (RAR, RFC 9396) provide a standardized way to express structured authorization details alongside OAuth scopes. These mechanisms can help express a narrow grant, but adopting them alone does not make policy least-privilege: the authorization server and resource must enforce the details that matter.
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Choose an expiry from the task, not a universal timer
Issue credentials just in time and set the expiry no later than the earlier of the task’s approved deadline and the organization’s maximum acceptable exposure window. End the grant sooner when the task completes. If work must continue past expiry, require a fresh authorization decision that checks the delegator, agent, requested scope, and task status rather than silently extending stale authority.
No cited standard establishes one correct number of minutes or hours for AI-agent delegation. Set and document a maximum based on task duration, risk, the resource’s validation capabilities, and the operational cost of asking for authorization again. NIST’s agent guidance favors dynamic, tightly scoped credentials and cautions against long-lived tokens; it does not prescribe a universal duration.
For long-running asynchronous work, use controlled renewal rather than an unbounded credential. A renewal must not broaden the original authority ceiling, and cancellation must reach queued work, callbacks, and downstream tools. The exact renewal design depends on the identity provider, agent runtime, and services involved.
Design revocation so it reaches the systems that enforce access
Give the delegator or an authorized operator a clear way to cancel the grant before it expires. Common cancellation triggers include withdrawn consent, task completion or cancellation, a compromised agent identity or credential, and the delegator losing the rights the agent relies on.
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1Fix the driver behind crashes, sound loss and screen glitches2Clear out junk files and repair common Windows errors3Scan for outdated or missing drivers - takes under a minuteRFC 7009 defines an OAuth token-revocation mechanism, but calling a revocation endpoint does not by itself prove that every resource server immediately stops accepting every already-issued or derived credential. Revocation works only as far as relevant services learn of it and reject access. Locally validated tokens may continue to be accepted until expiry unless the deployment adds a revocation-aware check or distribution mechanism.
- Identify every credential and access path: include access and refresh tokens, exchanged or derived tokens, child delegations, resource-side sessions, and queued work.
- Revoke through the supported control plane: use the authorization server’s revocation mechanism where available, and ensure gateways or resource servers apply the platform’s supported revocation checks.
- Stop work beyond token issuance: cancel queued tasks and callbacks and define what happens to operations already in progress.
- Measure residual access: test how long each relevant service may continue to accept access after cancellation, and document that behavior for operators.
Shorter credential lifetimes limit exposure when prompt revocation cannot be guaranteed. Online validation or revocation-event distribution can improve response where the platform supports it. Do not promise “instant” revocation unless the actual configuration and tests establish that result.
Make the grant and its use auditable
Keep enough information to reconstruct both the authorization decision and what followed. NIST’s NCCoE concept paper calls for linking actions to non-human identities and improving visibility into actions and outcomes.
- Record the delegator and the distinct agent identity.
- Store the delegation identifier, resource or audience, authorized operations, applicable boundaries, and any approval decision.
- Record when the grant begins and expires, whether it was renewed, and how it ended or was revoked.
- Associate actions with the agent and delegation, including relevant outcomes and generated data.
- Preserve links in the audit trail across token exchanges and any permitted sub-agent delegations.
Protect these records as security logs: restrict access, retain them according to organizational policy, and ensure incident responders can correlate identity, authorization, and resource-side events.
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Compare the design choices that affect risk and operations
| Decision | Narrower-control approach | Trade-off or implementation check |
|---|---|---|
| Scope expression | Structured, resource- and operation-specific authorization details, such as RAR where supported | Coarse scopes can be easier to deploy but may not express the boundaries a task needs. Confirm that services enforce structured details. |
| Identity model | Keep the agent actor distinct from the human or system subject | Impersonation can obscure which principal actually performed an action. Verify how the provider represents both identities in issued credentials and logs. |
| Token validation | Use online introspection or another revocation-aware enforcement design where appropriate | Locally validated tokens can avoid an online check but may leave residual access until expiry. Actual behavior depends on the platform. |
| Lifetime and renewal | Use one task-bounded credential for short work, or controlled short-interval renewal for long-running work | Tighter bounds limit exposure but can interrupt legitimate workflows. Renewal must not expand the original grant. |
| Revocation coverage | Cover access and refresh tokens, derived credentials, child grants, queued tasks, and resource-side sessions | Revoking only one token may leave other paths active. Establish which components receive and enforce cancellation. |
These are comparison axes, not guarantees that a particular protocol or vendor configuration provides every capability. OAuth Security Best Current Practice (RFC 9700) is relevant to secure OAuth deployments, but it does not set a universal AI-agent delegation lifetime. NIST IR 8587, finalized in September 2026, provides general token and assertion implementation recommendations covering areas such as key management, verification, lifecycle controls, configurability, interoperability, and monitoring; it should not be mistaken for an agent-specific policy.
Validate the behavior in the actual deployment
Standards define useful mechanisms and principles, but exact expiry controls, refresh behavior, revocation propagation, and treatment of in-flight work depend on the identity provider, runtime, gateways, and resource servers in use. Before relying on a delegation design, test it with the actual configuration.
Quick Recap
- Confirm that the issued authorization preserves both delegator and agent identities where required.
- Attempt an operation outside the grant’s resource, action, or object boundaries and confirm it is rejected.
- Check that expiry is enforced by each relevant resource, including after renewal or token exchange.
- Revoke a grant and verify the behavior of existing, refreshed, and derived credentials, queued work, and active operations.
- Confirm that logs connect the original authorization to agent actions and any downstream delegation.
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