For a server-side AI agent acting as a service, prefer a verifiable identity supplied by its runtime platform and federate it to the identity provider that protects the target API, when both platforms support that trust path. Use OAuth client credentials when you cannot use a supported workload identity or when the application’s identity model calls for a registered confidential client. These are not necessarily competing choices: federation can exchange a platform identity for an OAuth access token. Neither mechanism, by itself, gives an agent authority to act as a particular user.
What each mechanism establishes
OAuth client credentials
OAuth 2.0 client credentials is a grant for a confidential client: a server-side application authenticates to an authorization server and requests an access token. RFC 6749, Section 4.4, describes it for a client acting on its own behalf or requesting access under authorization previously arranged with the authorization server. The token represents the client or service, not a human user whose consent is automatically carried through.
The client must authenticate by a method configured with the authorization server. Depending on that configuration, it may use a client secret, a certificate or private key, or another supported method. Having a client ID alone is not the same as having permission to call an API: the authorization server and resource still determine what the client may access.
Workload identity and federation
Workload identity is the identity of a running service, grounded in the platform or identity system that can verify which workload it is. A cloud runtime, Kubernetes service account, OIDC issuer, or SPIFFE/SPIRE setup may provide a credential that identifies that workload. Workload identity federation establishes trust between that identity source and a separate identity provider or resource domain. The workload presents its trusted credential; the receiving provider can validate it and issue a credential for its own APIs.
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Federation therefore changes how the workload proves its identity to the target identity provider; it does not abolish authorization. The exchanged token still has to be accepted by the intended resource, and the resulting principal still needs appropriate permissions.
How the approaches compare
| Decision point | OAuth client credentials | Workload identity or federation |
|---|---|---|
| What it establishes | A registered OAuth client authenticates to an authorization server and requests a token. | A running workload proves an identity from a platform or identity source; federation can exchange that credential for one accepted in another trust domain. |
| Typical credential | A client secret, certificate or private key, or another configured client-authentication method. | A platform-issued credential, such as a Kubernetes or SPIFFE JWT-SVID, validated through configured trust. |
| Good fit when | A confidential server application can be registered and its authentication credentials can be protected. | The runtime has a verifiable identity and the target identity provider supports the required federation path. |
| Main operational work | Protect and rotate credentials; configure client authentication and permissions. | Configure and maintain issuer trust, identity-claim constraints, exchange settings, and permissions. |
| Authority for a user | Does not, by itself, represent the current user’s delegated identity. | Does not, by itself, represent the current user’s delegated identity. |
| Relationship to OAuth | An OAuth grant for obtaining an access token. | May rely on OAuth token issuance after the provider validates or exchanges the workload credential. |
Choose according to the agent’s authority and runtime
If the agent calls as a service
Use a service identity with only the resource permissions needed for the agent’s task. If the runtime offers a supported identity and the target provider accepts it through federation, that route can avoid manually provisioned long-lived client secrets. Confirm the supported issuer and exchange path for the specific environment and resource: vendor support for a platform scenario does not mean every application or API supports every flow.
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If the agent must act for a user
Workload identity proves which service is running; it does not convey a person’s consent or authority. Client credentials likewise identify the client rather than the current user. Add a delegated authorization flow when the agent must exercise a user’s permissions. In Microsoft Entra’s architecture guidance, a delegated access token includes the current user’s identity; that is a distinct authorization model from workload authentication.
If no supported federation path exists
OAuth client credentials remain a practical option for a confidential server application when the target authorization server supports the required client-authentication method. RFC 9700, published in January 2025, recommends asymmetric client authentication where feasible, including mutual TLS or signed JWT assertions. This reduces reliance on a shared client secret, but still requires secure key handling and correct configuration.
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Check these points before choosing
- Define the authority. Decide whether the agent acts as itself or must act within a specific user’s permissions. Do not infer user authority from a service identity.
- Identify the runtime credential. Determine whether the hosting environment can provide a managed identity, Kubernetes service-account token, OIDC-issued credential, or SPIFFE/SPIRE credential, and how that credential is bound to this workload.
- Verify the receiving provider’s support. Check that the identity provider for the target API trusts the relevant issuer and supports the required exchange for this workload and resource. Microsoft documents federation scenarios including Kubernetes clusters (AKS, EKS, GKE, and on-premises), GitHub Actions, Azure compute using app identities, Google Cloud, and AWS. Google Cloud documents federation for external workloads authenticated by OIDC or SAML 2.0 providers, among other credential sources. These are provider-documented scenarios, not a guarantee of support for every integration.
- Constrain access. For federation, tightly restrict trusted issuers and the workload identity claims that qualify, then assign only the permissions the resource task requires. For client credentials, assign only the necessary client permissions and protect its credentials from source code, logs, and unauthorized access.
- Plan lifecycle and recovery. Test token renewal, issuer or signing-key rotation, audience mismatches, denied permissions, and what happens when a workload identity is removed or trust is revoked. Exact steps vary by provider; there is no single cross-provider procedure.
What federation removes—and what it does not
In a supported, correctly configured setup, federation can remove the need to store and rotate a manually managed client secret for that trust path. Microsoft’s SPIFFE/SPIRE tutorial, for example, describes a workload receiving a SPIFFE ID and JWT-SVID from SPIRE, establishing trust with Entra ID, then exchanging that credential for an Entra access token to access Azure resources without storing secrets or certificates. Its prerequisites and setup depend on the current SPIRE and Kubernetes instructions.
Federation still depends on correct issuer, subject or other identity-claim, audience, and permission configuration. Misconfigured trust can admit the wrong workload; overly broad resource permissions can give an correctly authenticated agent more access than its task requires. A platform-issued identity is not a substitute for reviewing who can deploy workloads or alter their identity bindings.
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What is settled for AI agents
The underlying distinction is established in OAuth standards and platform identity documentation; an AI agent is still a server-side workload for these purposes. The IETF document titled “AI Agent Authentication and Authorization,” version 03, was published on 6 July 2026 as an informational Internet-Draft and proposes applying existing WIMSE and OAuth specifications. It is a draft, not a final interoperable standard, and its version and status can change. Check implementation support in the current documentation for the platforms involved rather than assuming draft proposals are universally implemented.
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