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Give each tool only the permissions its task requires, and bind its access token to the service meant to receive it. Scopes express service-specific access rights; they do not, by themselves, identify the token’s destination or guarantee that a request is authorized. Each receiving server must check the token’s intended audience and whether the requested operation on the target resource is permitted.
Start with the boundary: permission is not destination
OAuth scope names are not a universal vocabulary for AI tools. Each authorization server and API defines which scope values it accepts and what those values permit. A label such as tool:read may be useful as an internal example, but it is not a standard OAuth scope and should not be treated as one. Use the target service’s documented permissions, and document their meaning in your own integration.
Keep four concepts distinct:
| Concept | What it indicates | What it does not establish by itself |
|---|---|---|
| Scope | Access rights requested for a service or resource, using that service’s scope vocabulary. | That a token is intended for a particular server, or that a particular object-level operation is allowed. |
| Resource | The resource identifier—often a URI—for which the client requests a token. | That the resource server has correctly authorized every requested operation. |
| Audience | The intended recipient or resource server for a token. | That the token has the permissions needed for every request made to that recipient. |
| Token exchange | A way to request a new token based on an existing subject token and, optionally, an actor token, with requested target and permissions. | Automatic privilege reduction; the authorization server must still apply its policy. |
RFC 8693 describes scope as access rights in the context of target services and defines token-exchange parameters for target and requested scope. See RFC 8693. Resource and audience mechanisms vary by deployment, so verify which one the provider supports.
Design permissions from the tool’s actual actions
Do not start by inventing one broad scope for “the agent.” Start with what each tool can do, what data it can touch, and what consequences a call can have. This inventory is a design method, not a prescribed OAuth naming scheme.
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- List each operation. Record the tool action, affected resource, whether it reads, writes, or deletes data, and whether it creates an external side effect.
- Record the access boundary. Note the user or tenant whose data is involved, and whether the operation is limited to particular objects or records.
- Map actions to provider permissions. Request only the documented permissions that support the task. Prefer a read-only or narrower permission when that is sufficient; keep write, delete, administrative, or broad offline access separate when the provider offers that separation.
- Check the real enforcement point. Confirm that the API checks the relevant permission for the operation. A scope string in a token is not proof that the API enforces the intended distinction.
For example, an agent that searches a calendar and an agent that creates or deletes events have different authority needs. Request the provider’s actual read permission for search if that is enough; do not assume a made-up “calendar read” label exists, or that a broad calendar scope is read-only. The provider’s documentation and server behavior determine what the scope means.
Bind each token to its intended tool or service
Request a token for the specific resource server that will receive it, using the resource or audience mechanism supported by the authorization server. The receiving server should reject a token that was not issued for it. A separate server will normally need its own resource-bound token rather than a shared credential intended to work everywhere.
This destination boundary matters when an agent can call multiple APIs. If one request names multiple resources, RFC 8693 explains that the requested rights apply across the targets as a Cartesian product: the requested scopes are combined with all named target services. A multi-target request can therefore grant a broader combination of access than its list of scope names may suggest. Avoid including unrelated services merely to simplify token handling. See RFC 8693, section 2.1.1.
The IETF’s OAuth security guidance says token privileges should be restricted to the minimum required for the use case and tokens should be restricted to a specific resource server—or a small set when a single server is not feasible. The resource server must reject a token that was not intended for the requested action on the requested resource. See RFC 9700, sections 2.3 and 4.10.2.
Use a new credential at each trust boundary
Consider an agent runtime that calls a tool gateway, which then calls an upstream API. The runtime’s token is for the gateway; it is not automatically valid for the upstream service. The gateway should obtain a separate credential issued for the upstream API under the authorization server’s policy, rather than forwarding the incoming tool token.
For deployments using the Model Context Protocol, its authorization security considerations say an MCP server must use a separately issued upstream token when calling an upstream API and must reject tokens that were not issued for that server. The guidance is in the MCP authorization security considerations; check that the version matches the one adopted by your deployment.
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Where supported, OAuth token exchange can express the subject, actor, target resource or audience, and requested scope for the new token. Exchange is a mechanism, not a guarantee that the new token is narrower: the authorization server’s policy must limit what the gateway can obtain. If exchange is unavailable, use the provider’s supported authorization flow for the upstream API rather than reusing a token with the wrong audience.
Make the resource server enforce the full decision
The model’s prompt, the tool name, and a scope label are not security boundaries. The server receiving a request needs to validate the token and authorize the actual operation and object. OAuth security guidance says a server must reject a token not intended for the action on the resource; RFC 9700 also recommends minimizing token privileges. See RFC 9700.
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As applicable to the token format and deployment, verify the issuer, signature or introspection result, expiration, audience or resource, and permission for the requested operation. Pair scope checks with object- or tenant-level authorization wherever the service’s access model requires it. A scope may establish a category of access without proving that the user or agent can reach a particular record.
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Keep delegated user access distinct from service or agent identity. Decide whose authority the tool call represents, and ensure the resource server applies the corresponding user, tenant, and object checks. OAuth scope design cannot establish that a tool’s business logic correctly enforces those boundaries.
Reduce the impact of leaked or misused tokens
- Minimize privileges and destinations. Avoid broad scope sets and multi-resource grants that are not necessary for the task.
- Limit token lifetime. Use short-lived access tokens and provider-supported renewal and revocation practices appropriate to the architecture.
- Protect credentials. Keep tokens out of prompts, logs, and tool outputs.
- Consider sender constraint. DPoP or mutual TLS can bind tokens to a client key or certificate where both the provider and deployment support it. These mechanisms add deployment requirements; confirm provider support and operational fit before relying on them. RFC 9700 discusses sender-constrained tokens and related security considerations at sections 2.2 and 4.10.
- Handle refresh tokens deliberately. RFC 9700 requires public-client refresh tokens to use sender constraint or rotation. Follow the provider’s documented requirements for the client type and flow you use.
Test that the boundaries fail closed
Validate authorization with negative cases, not only successful calls. These are suggested checks derived from the cited enforcement requirements, not reported test results:
- A read-only token cannot write or delete.
- A token intended for Tool A is rejected by Tool B.
- A token for one tenant cannot access another tenant’s objects.
- A gateway’s incoming agent token is not accepted by an upstream API unless that API specifically issued or accepts it for that audience.
- A request for an unauthorized operation or object is rejected even when the caller has a valid token for the service.
Record the expected denial behavior and verify it against the actual API or gateway. A provider may offer only coarse scopes, may not support audience or resource selection, or may implement permissions differently from the granularity your tool design needs. Confirm those capabilities in provider documentation rather than assuming every deployment supports per-action scopes or token exchange.
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Compare multi-tool designs before choosing one
When deciding whether to share credentials or request separate tokens, compare designs against the boundaries that affect risk and operations:
- Permission granularity and enforcement: Can the provider separate read, write, delete, and administrative actions, and does the API enforce them?
- Destination boundary: Is each token limited to the intended tool or resource server?
- Identity model: Does the request act for a user, a service, or an agent identity, and are tenant and object checks preserved?
- Side effects: Can the design keep state-changing actions apart from read-only tasks?
- Lifecycle: What are the token lifetime, renewal, and revocation options?
- Sender constraint: Do the client and server support an appropriate mechanism, and can it be operated safely?
- Delegation and audit: Can the authorization server issue an appropriately constrained upstream token, and can calls be attributed and audited?
- Provider support: Are resource/audience targeting, token exchange, and fine-grained permissions actually available?
These are design criteria, not vendor rankings or a benchmark. If a provider cannot enforce the distinctions your use case requires, narrower naming conventions in the agent do not make the resulting access narrower.
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