Deploy Anthropic Integration

Overview

Claude integrations are stateless API wrappers — a serverless function receives a user request, streams from the Messages API, and returns the response. No database, no connection pool, no persistent state.

Vercel Edge Function (Recommended)

// app/api/chat/route.ts (Next.js App Router)
import Anthropic from '@claude-ai/sdk';

export const runtime = 'edge';

export async function POST(req: Request) {
  const client = new Anthropic();
  const { messages, system } = await req.json();

  const stream = await client.messages.create({
    model: 'claude-sonnet-4-20250514',
    max_tokens: 4096,
    system: system || 'You are a helpful assistant.',
    messages,
    stream: true,
  });

  // Convert Anthropic stream to ReadableStream for SSE
  const encoder = new TextEncoder();
  const readable = new ReadableStream({
    async start(controller) {
      for await (const event of stream) {
        if (event.type === 'content_block_delta' && event.delta.type === 'text_delta') {
          controller.enqueue(encoder.encode(`data: ${JSON.stringify(event.delta)}\n\n`));
        }
      }
      controller.enqueue(encoder.encode('data: [DONE]\n\n'));
      controller.close();
    },
  });

  return new Response(readable, {
    headers: {
      'Content-Type': 'text/event-stream',
      'Cache-Control': 'no-cache',
    },
  });
}

Instructions

Step 1: Deploy to Vercel

# Add secret
vercel env add ANTHROPIC_API_KEY

# Deploy
vercel --prod

Fly.io (Long-Running / WebSocket)

FROM node:20-slim
WORKDIR /app
COPY package*.json ./
RUN npm ci --only=production
COPY . .
EXPOSE 3000
CMD ["node", "server.js"]

fly launch --name my-claude-app
fly secrets set ANTHROPIC_API_KEY=sk-ant-api03-...
fly deploy

Google Cloud Run

gcloud run deploy claude-api \
  --source . \
  --region us-central1 \
  --allow-unauthenticated \
  --set-secrets=ANTHROPIC_API_KEY=claude-key:latest \
  --timeout=300 \
  --concurrency=80

Health Check

// api/health.ts
import Anthropic from '@claude-ai/sdk';

export async function GET() {
  try {
    const client = new Anthropic();
    const msg = await client.messages.create({
      model: 'claude-haiku-4-5-20251001',
      max_tokens: 5,
      messages: [{ role: 'user', content: 'ping' }],
    });
    return Response.json({ status: 'healthy', model: msg.model });
  } catch (err) {
    return Response.json({ status: 'unhealthy', error: err.message }, { status: 503 });
  }
}

Environment Variables

Variable	Required	Description
ANTHROPIC_API_KEY	Yes	API key from console.anthropic.com
ANTHROPIC_MODEL	No	Default model ID (override per request)
ANTHROPIC_MAX_TOKENS	No	Default max tokens

Output

• Application deployed to chosen platform with streaming support
• ANTHROPIC_API_KEY stored in platform secrets manager
• Health check endpoint returning Claude connectivity status
• Environment-specific configuration (model, max_tokens) in place

Error Handling

Issue	Cause	Solution
FUNCTION_INVOCATION_TIMEOUT	Claude response > function timeout	Set timeout to 300s. Use streaming.
Secret not found	Missing env var	Add via platform CLI
529 in production	API overloaded	SDK retries automatically. Add fallback model.
CORS errors	Missing headers	Add CORS headers to API route

Examples

See Vercel Edge Function (with SSE streaming), Fly.io Dockerfile, Cloud Run deploy script, and Health Check endpoint above.

Resources

• Anthropic API Docs
• Vercel AI SDK (optional higher-level wrapper)

Next Steps

See clade-observability for monitoring your Claude calls in production.

Prerequisites

• Completed clade-install-auth and clade-prod-checklist
• Production Anthropic API key (separate from dev key)
• Platform CLI installed: vercel, fly, or gcloud
• Application code tested locally