Claude SDK for Claude Platform on Google Cloud

This library provides convenient access to Claude Platform on Google Cloud — the first-party Claude API served through Google Cloud. It exposes the full Anthropic API surface and authenticates with a Google bearer token.

For the direct Claude API at api.anthropic.com, see @anthropic-ai/sdk. For the :rawPredict publisher-model API, see @anthropic-ai/vertex-sdk.

Installation

npm install @anthropic-ai/google-cloud-sdk

Usage

import { AnthropicGoogleCloud } from '@anthropic-ai/google-cloud-sdk';

const client = new AnthropicGoogleCloud({
  project: 'my-gcp-project', // or ANTHROPIC_GOOGLE_CLOUD_PROJECT
  workspaceId: 'wrkspc_...', // or ANTHROPIC_GOOGLE_CLOUD_WORKSPACE_ID
});

const message = await client.messages.create({
  model: 'claude-haiku-4-5',
  max_tokens: 1024,
  messages: [{ role: 'user', content: 'Hello, Claude!' }],
});

console.log(message.content);

See examples/ for runnable basic and streaming examples.

Configuration

| Option | Environment variable | Notes | | ------------- | ------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | project | ANTHROPIC_GOOGLE_CLOUD_PROJECT | GCP project id, used to derive the base URL. When neither is set (and no baseURL is given), it is resolved lazily from your Google credentials at or before the first request. | | location | ANTHROPIC_GOOGLE_CLOUD_LOCATION | GCP location. Optional — defaults to global. | | workspaceId | ANTHROPIC_GOOGLE_CLOUD_WORKSPACE_ID | Required unless skipAuth is set with an explicit baseURL. | | baseURL | ANTHROPIC_GOOGLE_CLOUD_BASE_URL | Overrides the base URL derived from project + location + workspaceId. | | skipAuth | — | Skips the bearer token, for gateways that authenticate upstream. A workspaceId is still needed unless baseURL is explicit. |

When the project is resolved lazily, await client.ready to fail fast on misconfiguration instead of waiting for the first request.

Authentication

Authentication uses a Google bearer token, resolved by precedence — an explicit bearerTokenProvider, then a google-auth-library googleAuth / authClient, then Application Default Credentials.

This client never uses the base SDK's Anthropic credential sources: ANTHROPIC_API_KEY, ANTHROPIC_AUTH_TOKEN, and profile config files are all ignored, and the only Authorization header it sends is the Google bearer token.

Application Default Credentials

Set up ADC (e.g. gcloud auth application-default login) and the client fetches and refreshes a bearer token for you, no auth options needed.

Custom Google credentials

Pass a GoogleAuth or AuthClient to override the default credential chain (for example to use impersonated credentials):

import { AnthropicGoogleCloud } from '@anthropic-ai/google-cloud-sdk';
import { GoogleAuth } from 'google-auth-library';

const client = new AnthropicGoogleCloud({
  project: 'my-gcp-project',
  workspaceId: 'wrkspc_...',
  googleAuth: new GoogleAuth({ scopes: 'https://www.googleapis.com/auth/cloud-platform' }),
});

Bearer token provider

If you already mint Google access tokens yourself, supply a bearerTokenProvider. It is invoked on every request and takes precedence over googleAuth / authClient and ADC:

const client = new AnthropicGoogleCloud({
  project: 'my-gcp-project',
  workspaceId: 'wrkspc_...',
  bearerTokenProvider: async () => myTokenSource.getAccessToken(),
});

Pre-authenticated proxy

If a gateway or proxy authenticates upstream on your behalf, set skipAuth to skip the bearer token (with an explicit baseURL, no workspaceId is needed):

const client = new AnthropicGoogleCloud({
  baseURL: 'https://my-proxy.example.com',
  skipAuth: true,
});