Usually, no. A single OAuth client registration can serve many users when one hosted agent service requests authorization on their behalf. Each user still needs a separate authorization grant and appropriately isolated tokens. Separate registrations make sense when the identity provider, tenant ownership, deployment design, or security policy calls for them—not simply because the software uses AI.
What an OAuth client represents
An OAuth client is the application that requests authorization from an authorization server. Its client ID identifies that software to the provider; it is not a user account. A confidential client may also authenticate with credentials, but those credentials establish the application’s identity—not permission to access a particular user’s data. The user grant and resulting tokens govern that access. The IETF’s OAuth 2.0 Authorization Framework (RFC 6749) defines client types and authorization flows without imposing a general one-client-registration-per-user rule.
In a multi-user service, the same application registration can therefore be used when different users authorize the app separately, subject to the provider’s rules. The service must preserve the association between each user, their grant, and their tokens; a shared client registration is not permission to reuse one user’s tokens for another.
Choose based on where the agent runs
| Deployment | Typical direction | What to check |
|---|---|---|
| One hosted agent service for many users | A single confidential client registration is often a reasonable starting point, with separate user grants and token records. | Provider rules for multi-user authorization, consent, redirect URIs, revocation, token storage, and tenant isolation. |
| Native or desktop agent | Treat it as a public client. Do not rely on a shared secret embedded in the application. | Authorization Code with PKCE, use of an external user agent, permitted redirect URI, and provider guidance. See RFC 8252. |
| Separate customer-controlled installations or tenants | Separate registrations may help distinguish ownership, redirect configuration, credentials, and administrative control. | Whether the provider requires or supports per-tenant registrations, and how credentials and registrations will be maintained. This is an architectural choice, not a universal OAuth requirement. |
| Agent needs an identity of its own while acting for a user | Consider an explicit delegation design, such as OAuth token exchange, if the authorization server supports it. | Issuer trust, audience, allowed actor, scopes, expiration, and provider policy. Token exchange is not automatic permission to delegate. |
Keep client type and credentials straight
Confidential server-side clients
A hosted service can be a confidential client if it can protect its credentials. Keep client credentials on the server and use an appropriate client-authentication method. RFC 6749 says authorization servers must not issue client passwords or other client credentials for client authentication to native or user-agent-based applications.
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Installed apps cannot safely keep a shared secret private: users can inspect the application or its runtime. For native apps, RFC 8252 calls for an external user agent and PKCE. The current OAuth security best-practice document, RFC 9700, requires public clients using the authorization-code flow to use PKCE, and recommends it for confidential clients as well.
Isolate grants and constrain tokens
Security depends on what the agent does with each user’s authorization, not on how many client IDs it has. Store token records so the service can reliably identify the user and grant they belong to, and ensure every action is authorized in that user’s context. Follow the provider’s revocation and offboarding behavior rather than treating a token as a general service credential.
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- Request only the scopes needed for the feature, and restrict the token’s audience to the intended resource server when feasible, as recommended by RFC 9700.
- Protect refresh tokens. RFC 9700 calls for public-client refresh tokens to be sender-constrained or rotated; refresh tokens issued to confidential clients are usable only by the client to which they were issued.
- Keep user and tenant boundaries enforced in the application, including when jobs are queued, retried, or delegated to tools.
- Plan for consent withdrawal, token revocation, credential rotation, and user offboarding.
When agent identity must be explicit
Sometimes a downstream service needs to know both which user delegated authority and which agent is acting. OAuth token exchange can represent delegation where the authorization server supports and permits it. RFC 8693 distinguishes this from impersonation: “With delegation semantics, principal A still has its own identity separate from B, and it is explicitly understood that while B may have delegated some of its rights to A, any actions taken are being taken by A representing B.” The protocol does not itself establish trust or compel a provider to issue such a token; those details depend on the deployment.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Check the provider before choosing registrations
The standards describe the general client model, but they do not decide every provider’s registration policy. Before implementing, verify whether the chosen provider allows one registration to authorize multiple users, what redirect URIs it accepts, how consent and revocation work, whether refresh tokens are issued and protected, and whether token exchange is available. Use separate registrations if those rules or your ownership and isolation requirements make them necessary; otherwise, separate per-user grants and securely isolated token records are the key distinction.
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