Before buying an identity platform for AI agents, check that it gives each agent a distinct, accountable identity; issues credentials it can verify, rotate and revoke; enforces narrowly scoped permissions outside the agent’s control; preserves delegation and audit context; and can demonstrate how those controls limit damage when an agent is manipulated. Evaluate those capabilities with your own workflows—not just a feature list.
Start with the identity model: who or what is the agent?
An agent needs an identity of its own, separate from the person or service operating it. That identity should connect to a responsible owner or system and to the agent’s permitted entitlements. It should also be possible to inventory agent identities and retire them when deployments or runtime instances are decommissioned.
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NIST Cybersecurity Insights made this distinction explicit in its August 27, 2026 post, “Back to the Future”: agents should be treated as “first-class entities” with unique identifiers, credentials and entitlements bound to the identity of the user or system operating them. A shared human login or service credential obscures which agent acted and can allow one agent to impersonate another.
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#1 Best Overall
- POWERFUL SECURITY KEY: The Security Key C NFC is the essential physical passkey for protecting your digital life from phishing attacks. It ensures only you can access your accounts.
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- FAST & CONVENIENT LOGIN: Plug in your Security Key C NFC via USB-C and tap it, or tap it against your phone (NFC) to authenticate. No batteries, no internet connection, and no extra fees required.
- TRUSTED PASSKEY TECHNOLOGY: Uses the latest passkey standards (FIDO2/WebAuthn & FIDO U2F) but does not support One-Time Passwords. For complex needs, check out the YubiKey 5 Series.
- BUILT TO LAST: Made from tough, waterproof, and crush-resistant materials. Manufactured in Sweden and programmed in the USA with the highest security standards.
How are credentials issued, protected and revoked?
Ask for a walkthrough of the complete credential lifecycle: issuance, storage, verification, renewal or rotation, expiry and revocation. Confirm that secrets are not placed in source files, configuration, prompts or logs, and find out what happens to active access when an agent or its owner is disabled.
Do not treat a long-lived bearer token or static API key as proof of an agent’s identity. NIST’s agent-identity guidance warns that possession of such a credential does not, by itself, establish identity; a stolen, broadly scoped secret can also expose more access than intended. Ask how the platform binds credentials to identities and verifies them, and request a live demonstration of revocation and its effect on access.
For federated or multi-system deployments, OWASP’s AI Security Verification Standard (AISVS) 1.0, control 5.1.2, says to verify that agents authenticate with short-lived, minimally scoped, cryptographically signed tokens. Treat that as a concrete verification criterion, not a substitute for asking how the product handles your own credential stores and integrations.
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Authentication answers which identity is presenting a credential; authorization determines which actions that identity may take. Evaluate them separately. A successfully authenticated agent should still receive only the tools, APIs, data and operations needed for its task.
Rank #2
- POWERFUL SECURITY KEY: The Security Key NFC is the essential physical passkey for protecting your digital life from phishing attacks. It ensures only you can access your accounts.
- WORKS WITH 1000+ ACCOUNTS: Compatible with Google, Microsoft, and Apple. A single Security Key NFC secures 100 of your favorite accounts, including email, password managers, and more.
- FAST & CONVENIENT LOGIN: Plug in your Security Key NFC via USB-A and tap it, or tap it against your phone (NFC) to authenticate. No batteries, no internet connection, and no extra fees required.
- TRUSTED PASSKEY TECHNOLOGY: Uses the latest passkey standards (FIDO2/WebAuthn & FIDO U2F) but does not support One-Time Passwords. For complex needs, check out the YubiKey 5 Series.
- BUILT TO LAST: Made from tough, waterproof, and crush-resistant materials. Manufactured in Sweden and programmed in the USA with the highest security standards.
Ask the vendor to demonstrate:
- Default-deny behavior and explicit allow-lists for tools, APIs, resources and actions.
- Permissions that can be narrowed by task context or risk, rather than a broad grant that applies to every agent activity.
- Policy decisions enforced independently of the agent’s model output and execution environment. Ask where the authorization policy decision point runs and whether the agent can alter or bypass it.
- Step-up authentication for high-risk operations and just-in-time privileged access where elevated rights are necessary.
- Enforcement of authorization context across AI retrieval pipelines, so a model cannot use retrieved content as a route around the user’s or agent’s access limits.
These controls reflect implementation checks in OWASP AISVS 1.0, including default-deny access, isolated policy decision points and context enforcement in retrieval workflows. Request a demonstration that shows a denied action as well as an allowed one.
Does delegation preserve who authorized an action?
Many agents act for a user or service rather than solely on their own authority. The platform should retain the relationship between the agent, the party that authorized it, the grant’s limits and the action taken. A log that identifies only the human account or only the agent is not enough to reconstruct that chain.
Ask the vendor to show how a delegated grant is created, narrowed, recorded and withdrawn. Test whether revoking one delegation removes that authority without disabling unrelated agent identities or grants. NIST’s February 5, 2026 concept paper identifies delegation and “on behalf of” scenarios as open design questions for agent identity, so do not assume that a product’s ordinary user login flow provides adequate delegation records.
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Can you investigate and attribute an agent’s actions?
Request an example audit trail for a real workflow. It should let an investigator determine which agent acted, under whose authority, on whose behalf, against which resource, and what action was taken. Ask how records are protected, retained and made available for review of consequential actions or disputes.
Rank #3
NISTIR 8587, published September 15, 2026, gives guidance on token and assertion protection for federal agencies and cloud service providers, including controls involving identity providers, authorization servers, key management, token verification and lifecycle management for single sign-on, federation and API access. Its intended audience is specific: use it as a useful security reference, not as a claim that every recommendation is a universal procurement requirement.
What happens when an agent is prompt-injected?
Identity controls cannot guarantee that a model will behave safely. They can, however, restrict what the agent can do when malicious instructions arrive through a user prompt, retrieved material or a connected tool.
In a vendor demonstration, introduce a prompt-injection attempt that asks the agent to use an unauthorized tool or access an out-of-scope resource. Check whether an independently enforced policy blocks the request, whether the agent can change its own permissions, and whether the attempt leaves an actionable audit record. NIST’s concept paper treats prompt-injection prevention and impact mitigation as areas of active work; evaluate the boundary the platform can enforce rather than accepting a promise that the model will never be manipulated.
How mature are the standards and integrations?
Ask what works in the product now, what interoperates with your current identity and access-management environment, and what remains planned or dependent on emerging standards. NIST’s August 27, 2026 post names SPIFFE and OAuth 2.0 as mechanisms that can address many enterprise agent identity and authorization use cases. It describes WIMSE and the Identity Assertion JWT Authorization Grant as emerging standards work—not as proof that a particular vendor has implemented them.
Rank #4
- Ultra-Compact FIDO2 Security Key - Plug-and-stay or carry on a keychain. This USB-A hardware security key offers portable, always-on protection for desktop and mobile use. (Item Size: 0.75 X 0.74 IN x 0.25 IN)
- USB-A Hardware Key for All Devices - Works with USB-A ports on PC, Mac, Android, and other laptop/notebook device. Enables secure, cross-platform login with FIDO2.0 passkey support.
- FIDO Certified Security Key - Meets FIDO and FIDO2 standards. Works with Google, Microsoft, GitHub, Dropbox, and more. Please check service compatibility before purchase.
- Passwordless Login with Passkey - Supports passkey login via WebAuthn and CTAP2. Enjoy password-free sign-ins where supported. Not all websites or services currently support passkeys.
- Advanced Multi-Factor Authentication - Offers 200 FIDO2 passkey slots and 50 OATH-TOTP slots. Strong, flexible 2FA/MFA support across various apps and authentication platforms.
NIST published its software and AI agent identity concept paper on February 5, 2026. Its public-comment period ran through April 2, 2026, and the project page described feedback and resource release as rolling. The paper raises questions across identification, authentication, authorization, delegation, auditing, non-repudiation and prompt injection; it is a sign of an evolving field, not a finalized procurement checklist.
Keep human authentication requirements distinct from agent identity requirements. NIST SP 800-63B-4, published in July 2025, covers authentication of subjects using government information systems and supersedes the 2020 edition. It may inform how an organization authenticates people, but its stated scope is not a complete framework for identifying and authorizing AI agents.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Compare vendors with evidence, not feature names
Use the same scenarios and evidence requests for each shortlisted platform. A vendor’s documentation, demonstration and contractual commitments should establish the following; a “yes” in a feature matrix is not enough without showing how the capability works in your environment.
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|---|---|---|
| Identity granularity and ownership | Whether deployed agents and relevant runtime instances can be distinguished and tied to a responsible owner, user or system. | Show identity creation, inventory, ownership changes and retirement for a representative deployment. |
| Credential lifecycle | How credentials are issued, verified, expired, rotated and revoked, and how the product avoids exposed or overly broad secrets. | Demonstrate token or credential revocation and document storage, expiry and rotation behavior. |
| Action-level authorization | Whether rights can be limited to specific tools, APIs, data and actions, with independent enforcement and default-deny controls. | Run an allowed and a denied operation, then show where policy was evaluated and recorded. |
| Delegation and attribution | Whether records preserve the authorizing party, the agent, the grant’s scope and the resulting action. | Trace an “on behalf of” action and revoke its grant without affecting unrelated access. |
| Audit and investigation | Whether records support review of the agent, authority, principal, resource and action involved. | Provide a representative audit trail and explain its protection, retention and investigation workflow. |
| Integration fit | How the platform works with your OAuth, workload identity and IAM environment, including the protocols it supports in practice. | Demonstrate the integration in a representative architecture and identify dependencies or limitations. |
| Implementation maturity | Which capabilities are available and interoperable now, versus planned or dependent on draft or emerging work. | Ask for product documentation and a clear separation of implemented features from roadmap claims. |
This scorecard is a way to test fit, not a vendor ranking. NIST’s concept paper, NISTIR 8587 and OWASP AISVS provide design questions and verification criteria; they do not establish the feature set, availability, pricing, contractual terms or comparative performance of individual products.
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