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1111## How App Attest works
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13Each installation of your app uses Apple's [App Attest](https://developer.apple.com/documentation/devicecheck/establishing-your-app-s-integrity) service to prove that it is a genuine, unmodified build of the app you registered. Anthropic then issues the device a short-lived access token that bills usage to your workspace. The app ships no API key, and there is no proxy for you to operate.
13Each installation of your app uses Apple’s [App Attest](https://developer.apple.com/documentation/devicecheck/establishing-your-app-s-integrity) service to prove that it is a genuine, unmodified build of the app you registered. Anthropic then issues the device a short-lived access token that bills usage to your workspace. The app ships no API key, and there is no proxy for you to operate.
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1515App Attest authentication is available only when your app calls the Claude API directly. It is not available through Amazon Bedrock, Google Cloud, or Microsoft Foundry.
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17The first time your app uses Claude on a device, the app requests a challenge from Anthropic, attests the device with Apple's `DCAppAttestService`, and exchanges the verified attestation for an access token. The Claude for Foundation Models package runs this flow automatically and requests new tokens as they expire; there is no attestation code for you to write.
17The first time your app uses Claude on a device, the app requests a challenge from Anthropic, attests the device with Apple’s `DCAppAttestService`, and exchanges the verified attestation for an access token. The Claude for Foundation Models package runs this flow automatically and requests new tokens as they expire; there is no attestation code for you to write.
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1919Tokens are scoped to your workspace, expire after 1 hour, and authorize only [Messages API](https://platform.claude.com/docs/en/api/messages/create) calls. They carry no end-user identity: App Attest identifies your app, not the person using it, so handle any per-user logic in your app.
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29291. In Xcode, add the **App Attest** capability to your app target under **Signing & Capabilities**.
30302. In the Claude Console, go to the [App integrations](https://platform.claude.com/settings/workspaces/default/app-integrations) page (`platform.claude.com/settings/workspaces/default/app-integrations`). Each app integration belongs to one workspace. Select the workspace you want in the workspace picker in the sidebar.
31313. Click **Create app integration** and enter a name, your Apple Developer Team ID, and one or more bundle IDs (up to 32).
324. Copy the client ID (`clid_...`) from the integration's **Overview** tab and pass it to your app's Claude configuration.
324. Copy the client ID (`clid_...`) from the integration’s **Overview** tab and pass it to your app’s Claude configuration.
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3434## Revoke an app integration
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