anth-hello-world

# Anthropic Hello World ## Overview Three minimal examples covering the Claude Messages API core surfaces: basic text completion, vision (image analysis), and streaming responses. ## Prerequisites - Completed `anth-install-auth` setup - Valid `ANTHROPIC_API_KEY` in environment - Python 3.8+ with `anthropic` package or Node.js 18+ with `@anthropic-ai/sdk` ## Instructions ### Example 1: Basic Text Message (Python) ```python import anthropic client = anthropic.Anthropic() message = client.messages.create( model="claude-sonnet-4-20250514", max_tokens=1024, messages=[ {"role": "user", "content": "Explain quantum computing in 3 sentences."} ] ) # Response structure print(message.content[0].text) # The actual text response print(f"ID: {message.id}") # msg_01XFDUDYJgAACzvnptvVoYEL print(f"Model: {message.model}") # claude-sonnet-4-20250514 print(f"Stop: {message.stop_reason}")# end_turn print(f"Usage: {message.usage.input_tokens}in / {message.usage.output_tokens}out") ``` ### Example 2: Vision — Analyze an Image (TypeScript) ```typescript import Anthropic from '@anthropic-ai/sdk'; import * as fs from 'fs'; const client = new Anthropic(); // From file (base64) const imageData = fs.readFileSync('chart.png').toString('base64'); const message = await client.messages.create({ model: 'claude-sonnet-4-20250514', max_tokens: 1024, messages: [{ role: 'user', content: [ { type: 'image', source: { ...