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Secure the account you’ll use to authorize the agent
Use a unique password if the service still relies on passwords, and enable multifactor authentication (MFA). If the provider supports them, a passkey or FIDO-compatible hardware security key offers phishing-resistant sign-in. Also review recent account activity and active sessions; a new sign-in factor does not necessarily end sessions that already exist.
After a suspected compromise, change an exposed password, end active sessions, revoke affected API keys, and inspect usage. Exact controls vary by provider. For example, OpenAI says enabling MFA does not itself log out existing sessions, and logging out all sessions may take up to 30 minutes to complete on other ChatGPT sessions. See OpenAI’s account-security guidance.
Consider recovery before enabling stronger sign-in
OpenAI’s Advanced Account Security is a product-specific option, not a universal agent setting. OpenAI describes passkey or physical-key sign-in, disabled password login and email/SMS recovery for enrolled users, shorter sessions, and session alerts and management. The tighter recovery model has a trade-off: OpenAI says Support cannot help recover accounts enrolled in the feature. Availability is limited to eligible users, so check eligibility and make sure you can reliably access your recovery method before enabling it. Details are in OpenAI’s Advanced Account Security announcement.
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- 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.
- WORKS WITH 1000+ ACCOUNTS: Compatible with Google, Microsoft, and Apple. A single Security Key C NFC secures 100 of your favorite accounts, including email, password managers, and more.
- 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.
Limit what the agent can access and do
Grant only the data, resources, and actions required for the task. If the agent only needs to find information, choose read-only access rather than permissions to send, edit, delete, purchase, or administer. Avoid broad mailbox, file, payment, or administrative access granted merely for convenience.
Assess the combined effective permissions, not just each permission in isolation. An agent’s roles, connected tools, and downstream services can add up to wider access than any one grant suggests. Where the controls allow, deny unreviewed integrations and cross-tenant access by default. Microsoft’s guidance describes defining agent identity, scope, tool access, and auditability before expanding autonomy: Least privilege for AI agents with Microsoft Entra Agent ID.
Rank #2
- POWERFUL SECURITY KEY: The YubiKey 5C NFC is the most versatile physical passkey, protecting your digital life from phishing attacks. It ensures only you can access your accounts
- WORKS WITH 1000+ ACCOUNTS: Compatible with popular accounts like Google, Microsoft, and Apple. A single YubiKey 5C NFC secures 100+ of your favorite accounts, including email, password managers, and more
- FAST & CONVENIENT LOGIN: Plug in your YubiKey 5C NFC via USB and tap it, or tap it against your phone (NFC), to authenticate. No batteries, no internet connection, and no extra fees required
- MOST SECURE PASSKEY: Supports FIDO2/WebAuthn, FIDO U2F, Yubico OTP, OATH-TOTP/HOTP, Smart card (PIV), and OpenPGP. That means it’s versatile, working almost anywhere you need it
- PRIMARY & SPARE KEYS: Just like having a spare house key, we recommend buying two YubiKeys - one for daily use and one as a spare. That way you’ll never get locked out of your accounts
For workplace agents, assign an accountable identity
Give each organizational agent a distinct identity with a named owner and a documented purpose, environment, data access, and dependencies. Microsoft distinguishes autonomous agents from interactive agents and recommends choosing OAuth flows appropriate to the scenario, granting only necessary application permissions, and periodically auditing consent to catch permission creep. Because agents cannot complete interactive MFA controls, administrators should not assume user-targeted MFA policies apply to agent identities unchanged; use agent-specific access policies.
Require approval for consequential actions
When the platform provides the option, require confirmation before an agent sends email, makes a purchase, deletes data, or changes account or security settings. In ChatGPT workspace app controls, “Always ask” requests approval before the agent reads app information or makes changes. “Allow read actions” permits reads without asking but prompts before changes. Broader action settings allow more autonomy and therefore carry more risk. These controls are separate from the provider’s OAuth consent: changing an app’s action setting does not itself revoke the provider’s permission grant. Check both layers. See OpenAI’s workspace app-control guidance.
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Rank #3
- POWERFUL SECURITY KEY: The YubiKey 5 NFC is the most versatile physical passkey, protecting your digital life from phishing attacks. It ensures only you can access your accounts
- WORKS WITH 1000+ ACCOUNTS: Compatible with popular accounts like Google, Microsoft, and Apple. A single YubiKey 5 NFC secures 100+ of your favorite accounts, including email, password managers, and more
- FAST & CONVENIENT LOGIN: Plug in your YubiKey 5 NFC via USB and tap it, or tap it against your phone (NFC), to authenticate. No batteries, no internet connection, and no extra fees required
- MOST SECURE PASSKEY: Supports FIDO2/WebAuthn, FIDO U2F, Yubico OTP, OATH-TOTP/HOTP, Smart card (PIV), and OpenPGP. That means it’s versatile, working almost anywhere you need it
- PRIMARY & SPARE KEYS: Just like having a spare house key, we recommend buying two YubiKeys - one for daily use and one as a spare. That way you’ll never get locked out of your accounts
Keep instructions narrow and inspect the action
Give the agent a defined task and boundaries instead of open-ended authority such as “review my emails and take whatever action is needed.” Third-party content in an agent’s context can contain malicious instructions intended to redirect its behavior. OpenAI calls this prompt injection and advises reviewing details before confirming consequential actions. Approval controls can reduce risk, but they do not guarantee every attempted injection will be blocked. Read OpenAI’s explanation of prompt injections.
Protect credentials and prepare to revoke access
Do not put API keys in prompts or ship them in client-side code. For development, OpenAI recommends environment variables; for GitHub Actions, it recommends GitHub secrets. Use separate keys for different features, teams, or projects, rotate them periodically, and monitor API usage and spending. Store credentials using the platform’s supported secret-storage mechanism and restrict which runtime components can retrieve them. OpenAI’s API key safety guidance covers these practices.
Rank #4
- 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.
Before authorizing a connection, locate the provider’s page for connected apps or OAuth grants and confirm how to disconnect or revoke consent. In an organization, the response plan may also need to disable the agent identity, rotate credentials, invalidate tokens, and remove stale permissions. A disconnect button inside an agent interface may not remove the provider’s existing consent. Microsoft recommends testing revocation paths so administrators know what the controls actually disable.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Make agent actions visible
For organizational deployments, logs should let an investigator connect an action to the identity and access that enabled it. Capture the agent identity, effective scope, tool and action, affected resource, correlation ID, and any user on whose behalf it acted, where applicable. Review downstream authorization and application-permission logs as well as the agent’s own records. Recheck access when workflows, tools, data, or environments change: a chat transcript alone may not show the underlying actions needed to investigate misuse.
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- POWERFUL SECURITY KEY: The YubiKey 5 is a versatile physical passkey that protects your digital life from phishing attacks. It ensures only you can access your accounts.
- WORKS WITH 1000+ ACCOUNTS: Compatible with popular accounts like Google, Microsoft, and Apple. A single YubiKey 5 secures 100+ of your favorite accounts, including email, password managers, and more.
- FAST & CONVENIENT LOGIN: Plug in your YubiKey 5 via USB and tap it to authenticate. No batteries, no internet connection, and no extra fees required.
- MOST SECURE PASSKEY: Supports FIDO2/WebAuthn, FIDO U2F, Yubico OTP, OATH-TOTP/HOTP, Smart card (PIV), and OpenPGP. That means it’s versatile, working almost anywhere you need it.
- BUILT TO LAST: Made from tough, waterproof, and crush-resistant materials. Manufactured in Sweden and programmed in the USA with the highest security standards.
Compare connection settings before you approve
Use these questions to compare an agent or connection method rather than relying on a single “secure” label:
- Sign-in and recovery: Does the account support passkeys or hardware security keys, and can you recover access if a device is lost?
- Permission scope: Can you choose read-only access or narrowly limit write, delete, and other actions?
- Action approvals: Can you require confirmation for each high-impact action?
- Separate permission layers: Can you inspect both provider OAuth consent and the agent’s own action controls?
- Credential lifecycle: Where are credentials stored, how long do they last, and how can you rotate them?
- Visibility and revocation: Do logs show underlying tool actions, and can you disable the agent and revoke connected access promptly?
A FIDO security key is an optional way to strengthen sign-in when the account provider and your devices support it; it does not replace least-privilege permissions, action approvals, or a revocation plan. OpenAI’s announcement names YubiKey C Nano and YubiKey C NFC in a bundle, while noting that other FIDO-compliant keys or software passkeys may also be used. Yubico describes its Security Key Series as hardware-based FIDO authentication.
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