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Authentication for AI agents is a product decision because it determines not only which workload is calling a service, but also whose authority it is using and what that authority permits. A sound design distinguishes an agent’s identity from the user or organization it represents, limits delegated access to the intended resource and operation, and lets downstream services verify the authority behind a request.
Why agent authentication affects the product
A conventional login flow identifies a person. An AI agent may instead run as a workload, call several tools or services, and act under authority delegated by a person or organization. That makes identity part of how the product behaves: it affects what the agent can do, what a service can trust, and what the organization can later explain or revoke.
The IETF’s September 15, 2026 AI Identity Management System Internet-Draft proposes best practices for authentication and authorization of AI agent interactions. It describes applying workload identity and OAuth 2.0 to those interactions. The proposal is still an Internet-Draft, not a final RFC; it is a direction for design, not a settled agent-specific standard.
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What authentication proves—and what it does not
Identify the calling agent
Authentication answers which agent or workload is making a request. That identity should not be confused with the identity of the human or organization the agent represents. The August 2026 IETF internet architecture draft explicitly calls for separating those identities.
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Determine the authority for this request
Authorization answers whether the agent may access a particular resource and perform a particular operation, and under whose delegated authority. A credential that identifies an agent does not, by itself, establish that every action the agent might request is allowed.
For example, a product might authorize an agent to read one customer record on a user’s behalf without authorizing it to edit that record or read other customers’ data. The resource and operation limits are part of the decision, not details to infer from the agent’s identity.
Design decisions to make before choosing an implementation
The IETF drafts offer requirements and design directions rather than a finished product-selection rubric. Use the following questions to make the choices explicit:
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| Decision | Question for the product team | Design implication |
|---|---|---|
| Principal and agent | Is the agent acting independently, or on behalf of a user or organization? | Represent the agent and the principal separately so a service can tell whose identity is being authenticated and whose authority is being exercised. |
| Agent identity | How is the agent’s identity bound to the workload or key making the request? | Downstream services need a basis for recognizing the caller as the intended workload, rather than accepting an unsupported identity claim from another agent. |
| Permission scope | Which resources and operations does this request need? | Keep authorization evidence narrow and intended for the receiving audience. Do not treat a broad bearer credential as permission for unrelated actions. |
| Delegation | Can authority pass through multiple agents or tools? | Preserve enough verifiable delegation context for a recipient to determine effective authority, while disclosing only the information it needs. |
| Consent and audit | What evidence shows that delegation was permitted, and what must be recorded? | Decide how consent evidence and request history will be maintained so the authority behind an action can be reviewed. |
| Expiration and revocation | How can delegated authority end when it is no longer needed or permitted? | Plan for authority that is short-lived or revocable, rather than assuming a credential remains appropriate indefinitely. |
These are not interchangeable controls. A verifiable agent identity does not replace resource-level authorization; narrow scope does not by itself establish that a user delegated authority; and an audit record is not a substitute for being able to revoke access.
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Make effective authority verifiable across tools
A useful test is whether the service receiving a request can determine its effective authority without trusting claims that an intermediary agent cannot substantiate. This matters in multi-hop flows, where one agent invokes a tool or another agent before a request reaches the resource server.
The August 2026 architecture draft calls for verifiable delegation across multiple hops, privacy-aware disclosure, audience restriction, narrow scope, and authority that is revocable or short-lived. These are requirements in a draft, not evidence that every current product implements them. Product teams should decide which delegation information the recipient needs to verify the request, and avoid passing unrelated user or organizational data along with it.
What is established guidance and what is still evolving?
| Document | Status and date | Relevance |
|---|---|---|
| RFC 9700, Best Current Practice for OAuth 2.0 Security | Published in January 2025 | The published OAuth 2.0 security baseline identified in the cited materials. |
| AI Agent Authentication and Authorization, revision 03 | IETF Internet-Draft, published July 6, 2026 | Proposes using existing standards and identifying agent-specific gaps. |
| AI Agent Authorization Integration Framework, draft 00 | IETF Internet-Draft, published July 6, 2026 | Describes combining OAuth extensions for cross-domain identity, policy-based authorization, consent evidence, and multi-hop delegation. |
| Internet Architecture for AI Agents, revision 01 | IETF Internet-Draft, August 2026 | Sets out draft requirements for separating agent and principal identity, scoped evidence, verifiable delegation, and revocable or short-lived authority. |
| AI Identity Management System | IETF Internet-Draft, published September 15, 2026 | Proposes best practices applying workload identity and OAuth 2.0 to AI agent interactions. |
The distinction matters when making product commitments: RFC 9700 is published guidance, while the agent-specific documents above are work in progress and may change. The drafts identify problems and proposed directions; they do not establish that a single agent-authentication mechanism or complete implementation standard has been finalized.
How to turn the decision into a product requirement
- Map the actors. Record the workload making each call, the user or organization it may represent, and the resource server that decides whether to honor the request.
- Write permissions in resource-and-operation terms. Specify what the agent needs to access and what it may do there; do not leave the effective permission implied by a general-purpose credential.
- Trace delegated authority end to end. For every handoff between an agent, tool, and service, determine what the recipient can verify about the principal, the delegation, and the requested action.
- Set the evidence and lifecycle requirements. Define what consent and audit information must be retained, who can revoke authority, and when credentials or delegated permissions expire.
- Check the receiving service’s decision. Confirm that it can establish the caller’s identity and effective permission from verifiable evidence rather than accepting an intermediary’s unsupported assertion.
Identity and access management platforms that implement workload identity or OAuth authorization may be relevant when evaluating how to meet these requirements. The standards documents cited here do not evaluate vendors or establish a product recommendation.
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