Use WIF with Google Cloud

import os
import anthropic
import google.auth.transport.requests
import google.oauth2.id_token
from anthropic import WorkloadIdentityCredentials

AUDIENCE = "https://api.anthropic.com"


def fetch_google_identity_token() -> str:
    request = google.auth.transport.requests.Request()
    return google.oauth2.id_token.fetch_id_token(request, AUDIENCE)


client = anthropic.Anthropic(
    credentials=WorkloadIdentityCredentials(
        identity_token_provider=fetch_google_identity_token,
        federation_rule_id=os.environ["ANTHROPIC_FEDERATION_RULE_ID"],
        organization_id=os.environ["ANTHROPIC_ORGANIZATION_ID"],
        service_account_id=os.environ["ANTHROPIC_SERVICE_ACCOUNT_ID"],
        workspace_id=os.environ.get("ANTHROPIC_WORKSPACE_ID"),
    ),
)

message = client.messages.create(
    model="claude-sonnet-4-6",
    max_tokens=1024,
    messages=[{"role": "user", "content": "Hello from Cloud Run"}],
)
print(message.content[0].text)

import Anthropic from "@anthropic-ai/sdk";
import { oidcFederationProvider } from "@anthropic-ai/sdk/lib/credentials/oidc-federation";

const METADATA_URL =
  "http://metadata.google.internal/computeMetadata/v1/instance/service-accounts/default/identity?audience=https://api.anthropic.com&format=full";

async function fetchGoogleIdentityToken(): Promise<string> {
  const response = await fetch(METADATA_URL, {
    headers: { "Metadata-Flavor": "Google" }
  });
  return response.text();
}

const client = new Anthropic({
  credentials: oidcFederationProvider({
    identityTokenProvider: fetchGoogleIdentityToken,
    federationRuleId: process.env.ANTHROPIC_FEDERATION_RULE_ID!,
    organizationId: process.env.ANTHROPIC_ORGANIZATION_ID!,
    serviceAccountId: process.env.ANTHROPIC_SERVICE_ACCOUNT_ID,
    workspaceId: process.env.ANTHROPIC_WORKSPACE_ID,
    baseURL: "https://api.anthropic.com",
    fetch
  })
});

const message = await client.messages.create({
  model: "claude-sonnet-4-6",
  max_tokens: 1024,
  messages: [{ role: "user", content: "Hello from Cloud Run" }]
});
for (const block of message.content) {
  if (block.type === "text") {
    console.log(block.text);
  }
}

package main

import (
	"context"
	"fmt"
	"os"

	"cloud.google.com/go/auth/credentials/idtoken"
	"github.com/anthropics/anthropic-sdk-go"
	"github.com/anthropics/anthropic-sdk-go/option"
)

func main() {
	const audience = "https://api.anthropic.com"

	googleIDToken := func(ctx context.Context) (string, error) {
		creds, err := idtoken.NewCredentials(&idtoken.Options{Audience: audience})
		if err != nil {
			return "", err
		}
		tok, err := creds.Token(ctx)
		if err != nil {
			return "", err
		}
		return tok.Value, nil
	}

	client := anthropic.NewClient(
		option.WithFederationTokenProvider(googleIDToken, option.FederationOptions{
			FederationRuleID: os.Getenv("ANTHROPIC_FEDERATION_RULE_ID"),
			OrganizationID:   os.Getenv("ANTHROPIC_ORGANIZATION_ID"),
			ServiceAccountID: os.Getenv("ANTHROPIC_SERVICE_ACCOUNT_ID"),
			WorkspaceID:      os.Getenv("ANTHROPIC_WORKSPACE_ID"),
		}),
	)

	message, err := client.Messages.New(context.TODO(), anthropic.MessageNewParams{
		Model:     anthropic.ModelClaudeSonnet4_6,
		MaxTokens: 1024,
		Messages: []anthropic.MessageParam{
			anthropic.NewUserMessage(anthropic.NewTextBlock("Hello from Cloud Run")),
		},
	})
	if err != nil {
		panic(err)
	}
	fmt.Println(message.Content[0].Text)
}

import com.anthropic.client.AnthropicClient;
import com.anthropic.client.okhttp.AnthropicOkHttpClient;
import com.anthropic.credentials.IdentityTokenProvider;
import com.anthropic.models.messages.MessageCreateParams;
import com.anthropic.models.messages.Model;
import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;

void main() {
    HttpClient http = HttpClient.newHttpClient();
    HttpRequest metadataRequest = HttpRequest.newBuilder()
            .uri(URI.create("http://metadata.google.internal/computeMetadata/v1/instance/service-accounts/default/identity?audience=https://api.anthropic.com&format=full"))
            .header("Metadata-Flavor", "Google")
            .build();

    IdentityTokenProvider fetchGoogleIdentityToken = () -> {
        try {
            return http.send(metadataRequest, HttpResponse.BodyHandlers.ofString()).body();
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    };

    AnthropicClient client = AnthropicOkHttpClient.builder()
            .federationTokenProvider(
                    fetchGoogleIdentityToken,
                    System.getenv("ANTHROPIC_FEDERATION_RULE_ID"),
                    System.getenv("ANTHROPIC_ORGANIZATION_ID"),
                    System.getenv("ANTHROPIC_SERVICE_ACCOUNT_ID"))
            .build();

    var message = client.messages().create(MessageCreateParams.builder()
            .model(Model.CLAUDE_SONNET_4_6)
            .maxTokens(1024)
            .addUserMessage("Hello from Cloud Run")
            .build());

    IO.println(message.content());
}

using Anthropic.Models.Messages;
using Anthropic.Oidc;

var credentials = new WorkloadIdentityCredentials(new WorkloadIdentityOptions
{
    FederationRuleId = Environment.GetEnvironmentVariable("ANTHROPIC_FEDERATION_RULE_ID")!,
    OrganizationId = Environment.GetEnvironmentVariable("ANTHROPIC_ORGANIZATION_ID"),
    ServiceAccountId = Environment.GetEnvironmentVariable("ANTHROPIC_SERVICE_ACCOUNT_ID"),
    WorkspaceId = Environment.GetEnvironmentVariable("ANTHROPIC_WORKSPACE_ID"),
    IdentityTokenProvider = new MetadataTokenProvider(),
});
using var client = new AnthropicOidcClient(credentials);

var message = await client.Messages.Create(new()
{
    Model = Model.ClaudeSonnet4_6,
    MaxTokens = 1024,
    Messages = [new() { Role = Role.User, Content = "Hello from Cloud Run" }],
});
foreach (var block in message.Content)
{
    if (block.Value is TextBlock textBlock)
    {
        Console.WriteLine(textBlock.Text);
    }
}

class MetadataTokenProvider : IIdentityTokenProvider
{
    private const string METADATA_URL =
        "http://metadata.google.internal/computeMetadata/v1/instance/service-accounts/default/identity?audience=https://api.anthropic.com&format=full";

    private static readonly HttpClient httpClient = new()
    {
        DefaultRequestHeaders = { { "Metadata-Flavor", "Google" } },
    };

    public async Task<string> GetIdentityTokenAsync(CancellationToken ct = default)
    {
        return await httpClient.GetStringAsync(METADATA_URL, ct);
    }
}

# Write the Google-signed identity token to a file the CLI can read
ANTHROPIC_IDENTITY_TOKEN_FILE=$(mktemp)
curl -sS -H "Metadata-Flavor: Google" \
  "http://metadata.google.internal/computeMetadata/v1/instance/service-accounts/default/identity?audience=https://api.anthropic.com&format=full" \
  > "$ANTHROPIC_IDENTITY_TOKEN_FILE"
export ANTHROPIC_IDENTITY_TOKEN_FILE

# ANTHROPIC_FEDERATION_RULE_ID, ANTHROPIC_ORGANIZATION_ID, and
# ANTHROPIC_SERVICE_ACCOUNT_ID, and ANTHROPIC_WORKSPACE_ID are read from the environment.
ant messages create \
  --model claude-sonnet-4-6 \
  --max-tokens 1024 \
  --message '{role: user, content: "Hello from Cloud Run"}'

<?php
require 'vendor/autoload.php';

use Anthropic\Client;
use Anthropic\Credentials\WorkloadIdentityCredentials;

const METADATA_URL = 'http://metadata.google.internal/computeMetadata/v1/instance/service-accounts/default/identity?audience=https://api.anthropic.com&format=full';

$context = stream_context_create([
    'http' => ['header' => "Metadata-Flavor: Google\r\n"],
]);

$credentials = new WorkloadIdentityCredentials(
    identityTokenProvider: fn() => file_get_contents(METADATA_URL, false, $context),
    federationRuleId: getenv('ANTHROPIC_FEDERATION_RULE_ID'),
    organizationId: getenv('ANTHROPIC_ORGANIZATION_ID'),
    serviceAccountId: getenv('ANTHROPIC_SERVICE_ACCOUNT_ID'),
    workspaceId: getenv('ANTHROPIC_WORKSPACE_ID') ?: null,
);
$client = new Client(credentials: $credentials);

$message = $client->messages->create(
    model: 'claude-sonnet-4-6',
    maxTokens: 1024,
    messages: [['role' => 'user', 'content' => 'Hello from Cloud Run']],
);
echo $message->content[0]->text, PHP_EOL;

require "anthropic"
require "net/http"

METADATA_URL = "http://metadata.google.internal/computeMetadata/v1/instance/service-accounts/default/identity?audience=https://api.anthropic.com&format=full"

credentials = Anthropic::WorkloadIdentityCredentials.new(
  identity_token_provider: -> { Net::HTTP.get(URI(METADATA_URL), {"Metadata-Flavor" => "Google"}) },
  federation_rule_id: ENV.fetch("ANTHROPIC_FEDERATION_RULE_ID"),
  organization_id: ENV.fetch("ANTHROPIC_ORGANIZATION_ID"),
  service_account_id: ENV.fetch("ANTHROPIC_SERVICE_ACCOUNT_ID"),
  workspace_id: ENV["ANTHROPIC_WORKSPACE_ID"]
)
client = Anthropic::Client.new(credentials: credentials)

message = client.messages.create(
  model: "claude-sonnet-4-6",
  max_tokens: 1024,
  messages: [{role: "user", content: "Hello from Cloud Run"}]
)
puts message.content.first.text