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Use OAuth when an AI agent needs access to an app on a person’s behalf and that app supports OAuth. Use a provider-issued API key when the integration is intended to act as a service identity and the provider documents that key as the right credential. Neither choice is automatically safe: permissions, token or key storage, renewal, revocation, and the way an agent selects and invokes tools all matter.
OAuth is an authorization framework, not simply a login button. An API key is not one universal protocol with a standard set of permissions. The right choice depends on what identity the app should see, what access the provider allows you to grant, and where your integration can protect its credentials.
What is the difference between OAuth and an API key?
OAuth lets a client request access to a resource with the resource owner’s approval. In a typical delegated flow, the user approves access through an authorization server; the client receives an access token and presents it to a resource server. The app does not need to hand its password to the agent. OAuth therefore fits a common personal-assistant scenario: a person connects an account, and an integration performs permitted actions for that person.
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1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minuteAn API key is a credential that an API provider accepts. Its identity and capabilities are defined by that provider. A key might be associated with a project, application, account, or service, but there is no single API-key protocol or universal permission model established across providers. Some keys may have configurable restrictions; others may have a narrower or broader role. Check the specific provider’s documentation rather than inferring what a key can do from its name.
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Both mechanisms can grant access, and either credential can be misused if exposed or overprivileged. OAuth’s delegated approval model does not itself guarantee that the resulting token is narrow or securely handled. An API key is not inherently unsafe if the provider’s model and your service architecture make it appropriate, but a key that represents a shared service identity may not provide the user-by-user authorization an app connection needs.
OAuth vs. API keys at a glance
| Question | OAuth | API key |
|---|---|---|
| Whose identity may be represented? | Often the resource owner who approved delegated access; the exact behavior depends on the provider and flow. | Provider-specific: it may represent an app, project, account, or service identity. |
| How is access granted? | Through an authorization flow in which the resource owner approves access, followed by token issuance. | The provider issues a key and defines what it permits and how it is managed. |
| Can access be narrowed? | Check the available scopes, resource or audience restrictions, and token lifetime. | Check the provider’s key permissions and whether separate keys can be issued for each integration or agent. |
| What does the client store? | Usually access-token material and, where the design uses one, refresh-token material. Both require protection. | The API key, which must be protected as a secret. |
| How does it expire or get revoked? | Expiry, refresh behavior, rotation, revocation, and audit support depend on the provider and implementation. | Expiry, rotation, revocation, and audit support depend on the provider’s key lifecycle. |
| Best fit | Delegated access to an app on behalf of a person, when the provider supports a suitable OAuth flow. | A documented service-to-service integration acting under a service identity, when that matches the intended access. |
The table describes common architectural patterns, not a guarantee about any particular app. A provider’s current integration documentation is authoritative for its supported credential types, permissions, and lifecycle.
Which should your AI agent use?
Choose OAuth for a person’s connected account
OAuth is usually the natural starting point when someone connects their calendar, files, email, or another account and expects the agent to act within that person’s authorization. Approval can be tied to that person’s account rather than relying on a credential shared across the whole integration. Whether the provider offers suitable scopes or account-level controls is a separate question; verify those details before relying on them.
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Consider an API key for a service identity
A key can fit a backend integration that connects one service to another under a project or service identity. That pattern is different from connecting each end user’s personal account: actions may be attributed to the service identity, and the key’s permissions may apply more broadly than one user’s data. Confirm the provider’s actual identity and authorization model before choosing this pattern.
Use a key only if the API provider documents it for the operation you need. Check whether the key can be restricted, whether one key can be isolated per integration, how it is revoked, and what activity can be audited. If the provider supports only a broad key but your use case requires per-user consent or separation, that is an architectural mismatch—not a reason to assume the key has finer controls than the documentation describes.
Do not choose by convenience alone
A key may look simpler because it avoids an interactive authorization flow, while OAuth may involve consent, redirects, and token renewal. Simpler setup is not necessarily safer or more suitable. Ask which identity should appear to the app, whether users must approve access independently, and whether the provider’s supported model can enforce the desired boundaries. If the API does not support the credential model your use case requires, do not invent a substitute flow.
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How to connect an agent safely
Before configuring a credential, write down what the agent must do and which identity should perform those actions. Then follow the provider’s documented connection method and design the credential lifecycle around it.
- Identify the actor and data. Decide whether the agent acts for an individual user or as a backend service. List the app resources and actions it actually needs. This makes it easier to spot a mismatch between delegated user access and a shared service credential.
- Check the provider’s current integration documentation. Confirm that it supports OAuth, an API key, or another documented mechanism for the exact API and use case. Record the identity represented, the permissions available, and any limits or prerequisites. Do not infer key privileges, scopes, token renewal, or revocation from another app’s behavior.
- Reduce the authority granted. For OAuth, request only suitable scopes and check whether tokens can be restricted to the intended resource or audience. For an API key, use the provider’s documented restrictions and separate-key options when available. The IETF’s OAuth 2.0 Security Best Current Practice, RFC 9700 (January 2025; page metadata updated May 20, 2026), emphasizes reducing token authority and protecting refresh tokens.
- Choose a credential-safe architecture. Keep secrets out of model prompts, untrusted tool output, and logs. Store them in an appropriate secret store accessible only to the components that need them. A model should receive the result of an authorized operation, not the credential itself. These are implementation precautions against disclosure; they do not prescribe one specific agent secret-management product.
- Use the provider’s authorization flow as documented. For OAuth, follow the flow the provider supports, validate redirect behavior, use TLS, and implement the required client authentication. RFC 9700 recommends strict redirect URI matching and avoiding insecure patterns. Do not copy a flow from an unrelated integration or treat a successful login as proof that the whole authorization design is secure.
- Define renewal and shutdown procedures before launch. Find out how the provider handles expiry, refresh, rotation, revocation, and audit records. Decide who can renew or revoke access, how a disconnected account is handled, and what the agent should do when authorization fails. The provider-specific answers are not uniform across apps.
- Test boundaries as well as successful calls. Verify that a user can connect the intended account, that the integration can perform only the intended operations, and that an expired or revoked credential stops working as expected. Test that a failed authorization does not cause the agent to silently switch to another user’s connection or a shared credential.
Where browser-based agents fit
A browser application and a server-side agent do not have the same ability to protect credentials. Browser code is delivered to a user’s environment, so it is not a safe place for a confidential client secret. A backend may be able to protect credentials and make authorized requests on the browser application’s behalf.
The IETF’s August 2026 browser-app best current practice, RFC 10017, addresses this distinct security model. It states: “The main benefit of using a token-mediating backend is the backend’s ability to act as a confidential client. Therefore, the token-mediating backend MUST act as a confidential client. Furthermore, the token-mediating backend MUST use the OAuth 2.0 Authorization Code grant as described in Section 2.1.1 of [RFC9700] to initiate a request for an access token.” This is normative text from the IETF document. It means a token-mediating backend is not merely a place to copy browser-held secrets: it has a defined confidential-client role and must use the specified authorization-code approach.
If an agent’s interface runs in a browser, determine which component starts the authorization flow, which component stores and uses tokens, and how the backend binds a request to the right account. Do not place a client secret in browser code or assume that moving a token to a backend automatically addresses account mix-ups, excessive permissions, or unsafe logging.
Protect tokens, keys, and user context
Bearer tokens and secret handling
OAuth access tokens are often bearer credentials: whoever possesses a usable token may be able to use it. RFC 6750, the IETF bearer-token usage specification from October 2012, requires TLS for bearer-token requests and says clients must safeguard tokens. Read it alongside the newer, broader security guidance in RFC 9700. These requirements make transport protection and secret handling part of the integration design, not optional cleanup.
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Do not include tokens or API keys in model instructions, conversation history, tool results that the model can freely repeat, source code shipped to a browser, or diagnostic logs. Keep them in a protected component, pass them only to the API call that needs them, and limit which processes or operators can retrieve them. If a credential may have been exposed, follow the provider’s revocation or rotation process and investigate where it could have been copied; deleting a visible log entry alone does not revoke a credential.
Refresh, expiry, and authority
Access tokens and refresh tokens have different roles when a provider’s OAuth implementation uses both. An access token authorizes API requests; a refresh token may allow a client to obtain new access tokens. Protect refresh tokens especially carefully because their renewal capability can extend access. RFC 9700 emphasizes refresh-token protection and reducing token authority.
RFC 6750 includes a recommendation that certain bearer tokens have a lifetime of one hour or less. Treat that as a normative recommendation for the specified context, not a measured result or a universal expiry rule for every app. The actual lifetime and renewal behavior must be checked in the provider’s documentation. Shorter token life does not by itself solve exposure if a refresh credential or a newly issued token is also mishandled.
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An agent may connect several tools and accounts, then choose which connection to use for a request. That creates a context problem in addition to the usual credential-storage problem: the authorization flow must stay associated with the intended tool and user. The IETF’s 2025 interim OAuth security presentation discusses cross-tool account takeover and cross-user OAuth session-fixation patterns in systems connecting tools and integrations to AI agents.
The presentation proposes keeping the tool or context that starts an OAuth flow aligned with the one that completes it, and keeping the initiating user aligned with the completing user. Treat this as an active standards discussion, not an adopted RFC, a prevalence study, or proof that a particular product is currently vulnerable. For an agent integration, make the account and tool binding explicit: the account selected at connection time should be the account whose authorization is used for the resulting operation.
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- Giving the agent a person’s password. OAuth exists in part to avoid giving the client the resource owner’s password. Use the provider’s supported authorization flow instead of collecting or embedding a password.
- Treating OAuth as automatically least-privilege. A token can still grant more authority than the agent needs. Review scopes, resource restrictions, and lifetime rather than relying on the protocol name or consent screen.
- Treating every API key alike. Key permissions and lifecycle are provider-specific. Read the documentation for the exact API and account type; do not assume one provider’s key behavior applies elsewhere.
- Putting a confidential secret in browser code. Browser applications have a distinct security model. Use an appropriate backend architecture and follow the browser-app best current practice where applicable.
- Sharing one credential across unrelated users or agents without understanding its reach. A shared service credential can blur which user authorized an action and can increase the impact of a leak. Check whether the provider can issue separate credentials or support delegated access for the required boundaries.
- Logging credentials to debug a failed call. Logs can persist and be accessible to more systems or people than the credential store. Log non-secret error details instead, and rotate or revoke any credential that was exposed.
- Assuming expiry is the same as revocation. A token or key may expire on one schedule while provider-side revocation follows another. Confirm how access is ended and test the behavior rather than relying on an assumed lifecycle.
- Allowing the agent to choose an account implicitly. In multi-tool or multi-user systems, bind the flow and the eventual API request to the intended user and tool. Do not let a successful authorization in one context authorize an operation in another by accident.
A practical decision checklist
Use this checklist before connecting an AI agent to an app:
- Does the agent act for an individual, or as a service?
- Does the provider document OAuth or an API key for this specific integration?
- Can the granted access be restricted to the necessary actions and resources?
- Where will the credential be stored, and which components can access it?
- What happens when the credential expires, is rotated, or is revoked?
- Can you associate each operation with the correct user, account, and tool?
- Have you tested authorization failure, account switching, and credential shutdown?
If the answers point to delegated, user-approved access, use a supported OAuth flow and constrain its authority. If the provider documents a suitable service credential and the agent truly acts as that service, an API key may be appropriate. If neither credential model provides the identity, permissions, or lifecycle your use case requires, do not compensate by putting a broader secret into the agent; choose a different supported integration design.
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