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Authorize a long-running AI agent throughout its lifecycle, not just when its job starts. Give the workload a distinct identity tied to the person or organization responsible for it, delegate only task-specific authority, check each consequential action at the tool or resource boundary, and reevaluate that authority as conditions change. This keeps decisions attributable and gives the system a way to narrow, expire, or revoke access while work is in progress.
What runtime authorization needs to establish
A running agent may act long after a person starts a task, call several tools, or delegate work to another agent. A single approval at launch cannot by itself establish whether each later action is still permitted. For every consequential request, the system should be able to answer four questions:
- Who is calling? Identify the agent or workload, separately from the user or service that initiated it.
- Whose authority is being used? Preserve the accountable user or organizational principal and the delegation that connects that principal to the agent.
- What is this call allowed to do? Check the requested action, resource, audience, and relevant constraints, rather than relying on a broad role alone.
- Is the permission still valid now? Account for expiration, revocation, policy changes, and security events that occurred after the task began.
NIST recommends treating agents as first-class entities with unique identifiers, credentials, and entitlements bound to the user or system operating them. It also warns that long-lived API keys and bearer tokens can be used by anyone who obtains them and may grant broad or insufficiently granular access. As NIST puts it, “Credential sharing is a bad idea in all contexts.” NIST Cybersecurity Insights
The Tool Desk
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Design the path from task creation through each protected action and eventual shutdown. Identity, credentials, policy decisions, and enforcement have different jobs; combining them into one vague “agent permission” makes it harder to determine what failed or what must be revoked.
#1 Best Overall
1. Establish agent and principal identity
Authenticate the workload that is making the call and identify the user or organization responsible for the task. Keep these identities distinct: a workload credential establishes which software is calling, while the principal and delegation record explain whose authority the workload is using and why. Bind the agent identity to its runtime context so that credentials cannot be treated as interchangeable across agents or tasks.
NIST identifies OAuth 2.0 and SPIFFE among relevant existing mechanisms; its guidance also discusses JWT and X.509 credentials. These are building blocks, not a complete agent authorization design. Choose mechanisms that let your services authenticate the workload and preserve its accountable principal. NIST guidance and the NIST NCCoE summary
2. Issue authority for the task, not the whole user account
Have an authorization service issue or exchange credentials for the task. Limit the resulting authority to the resources, actions, audience, and duration the task needs. Do not pass a user’s password or a broad, static credential to the agent. Scope should reflect what the agent may do, not merely which application it can reach.
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3. Decide and enforce at the action boundary
For each consequential tool call or resource operation, evaluate the authenticated workload, principal, delegation, requested action, target resource, and current context. Enforce the result where the action reaches the tool or resource—not only in the agent’s planning layer. The agent can propose an action, but the protected service must be able to reject it independently.
A useful separation is: workload identity proves which software is calling; a delegated credential carries some authority; a policy decision evaluates the request; and enforcement at the boundary allows or denies the operation. NIST’s NCCoE summary discusses external authorization interfaces such as AuthZen and policy engines including Cedar and OPA as options in this space. Those options do not remove the need to define resource-specific policies and apply them consistently. NIST NCCoE summary
4. Preserve authority when work is delegated again
If an agent delegates a subtask, pass only the authority that subtask requires and retain evidence connecting the child agent to its parent, the original principal, and the purpose and constraints of the delegation. A downstream agent should not receive an unrestricted copy of its parent’s credential merely because it needs to communicate with a tool.
The NCCoE summary describes emerging approaches such as token exchange, identity chaining, and transaction tokens. It also identifies an open challenge: retaining who delegated authority, to which agent, for what purpose and under which constraints, together with usable revocation and audit evidence. Protocols that help agents discover or communicate with tools do not, by themselves, establish permission to use them. NIST NCCoE summary
5. Reevaluate, expire, or stop
A long-running task should not treat its initial authorization as permanent. Reevaluate when relevant policy or security context changes, and set credentials to expire in line with the task rather than leaving them valid indefinitely. If authority is withdrawn, deny subsequent protected actions and stop or constrain the affected work.
Plan revocation around the credential and enforcement mechanisms you actually use: expiration alone does not provide immediate withdrawal, and a revocation signal is useful only if the relevant services receive it and act on it. NIST’s NCCoE summary identifies Shared Signals, CAEP, and RISC as specifications relevant to event sharing and continuous evaluation. NIST IR 8587, finalized September 15, 2026, gives implementation recommendations for federal agencies and cloud service providers on token protection, including verification, key management, lifecycle controls, and monitoring. It is token-security guidance, not an agent-specific authorization standard. NIST NCCoE summary and NIST IR 8587
6. Keep evidence of the decision and its changes
Record enough information to reconstruct who authorized an action and what the system decided. A useful event record includes the agent and principal identities, a credential or delegation reference, the action and resource, the decision, relevant policy context, and changes such as delegation, renewal, expiration, or revocation. Protect these records against unauthorized alteration and make them available to the teams responsible for investigation and operations.
NIST’s concept paper raises tamper-proof logging and non-repudiation as project questions; it does not establish one definitive interoperable solution. Choose and test an evidence design appropriate to your environment rather than assuming that a token format or policy engine alone provides a complete audit trail. NIST NCCoE concept paper
How to handle unpredictable tasks and high-impact actions
Some tasks are difficult to scope fully in advance. NIST’s concept paper frames this directly: “How do we establish ‘least privilege’ for an agent, especially when its required actions might not be fully predictable when deployed?” The practical response is not to grant open-ended access at task start. Begin with the narrowest useful authority, then make expansion an explicit policy decision based on the actual resource and action requested.
- Use separate permissions for reading, changing, and performing consequential operations where the system supports that distinction.
- Require a fresh decision when an action falls outside the task’s existing scope; do not let an earlier approval silently authorize new resources or purposes.
- For high-impact actions, add human approval when policy requires it, and bind the approval to the specific action and context rather than treating it as a general grant.
- When a request cannot be evaluated or its delegation chain cannot be established, fail closed for the protected action and provide a recoverable path, such as requesting approval or narrowing the task.
The IETF WIMSE interim slides include human-in-the-loop considerations, but they are working-group discussion material, not a normative specification. Decide which actions require approval in your own risk and policy model. IETF WIMSE interim slides
Where platform-specific flows fit
A vendor flow can show how identity and delegation mechanisms fit together, but it should not be mistaken for a universal standard. Microsoft documents an Entra Agent ID on-behalf-of flow in which a user’s token is exchanged for a resource token, subject to consent and audience/linkage requirements. In that configuration, Microsoft calls managed identities the preferred credential type and warns against using client secrets in production. These details apply to Microsoft’s documented implementation; validate them against its current documentation and your own deployment before adopting the flow. Microsoft Learn: Agent ID on-behalf-of OAuth flow
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Use the following questions in a design review or pilot. A system that can authenticate an agent but cannot explain its authority, enforce scope at the resource, or respond to changed conditions has only solved part of runtime authorization.
- Identity and attribution: Can logs distinguish the agent from the initiating user or organization, and connect both to the action?
- Scope: Are actions, resources, and audiences constrained, or does access rely on broad roles that exceed the task?
- Lifetime and revocation: When does authority expire, how are changes communicated, and what happens to work already underway?
- Delegation: Can the system reconstruct the parent-child chain, original principal, purpose, and constraints for each delegated call?
- Enforcement and context: Does the tool or resource check the actual request against current policy, rather than trusting the agent’s plan?
- Interoperability and maturity: Which parts use established mechanisms, and which depend on emerging specifications or platform-specific behavior?
- Evidence and operations: Can responders investigate a denied, allowed, or revoked action and verify that dependent services received relevant signals?
- Human approval: Which operations need a person to authorize a specific high-impact action, and how is that approval recorded?
Keep protocol roles distinct in this review. The NCCoE summary characterizes MCP and A2A as interoperability protocols, not complete identity or authorization standards; cross-domain workflows may need several protocols. Successful tool communication is not proof that an operation is authorized. NIST NCCoE summary
What is established—and what remains in development
OAuth, workload identity, token exchange, resource-level policy enforcement, and security-event signals provide practical building blocks for runtime controls. NIST’s February 2026 concept paper describes a proposed project and a public comment period running from February 5 through April 2, 2026; its questions about identity, authorization, audit, delegation, and prompt-injection mitigation should be read as project questions, not as completed recommendations. NIST NCCoE concept paper
Cross-agent delegation semantics, evidence across an entire chain, and some human-approval patterns are still evolving. NIST’s NCCoE summary and the IETF WIMSE slides discuss approaches and open issues; the slides are working-group material rather than a normative specification. Build around controls you can enforce and test today, and avoid assuming that emerging proposals already interoperate as a complete agent authorization system. NIST NCCoE summary and IETF WIMSE interim slides
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