claude-api

Files (23)

• plugin.json · .claude-plugin/
• README.md
• SKILL.md
• api-reference.md · references/
• prompt-caching-guide.md · references/
• rate-limits.md · references/
• tool-use-patterns.md · references/
• top-errors.md · references/
• vision-capabilities.md · references/
• check-versions.sh · scripts/
• basic-chat.ts · templates/
• cloudflare-worker.ts · templates/
• error-handling.ts · templates/
• extended-thinking.ts · templates/
• nextjs-api-route.ts · templates/
• nodejs-example.ts · templates/
• package.json · templates/
• prompt-caching.ts · templates/
• streaming-chat.ts · templates/
• tool-use-advanced.ts · templates/
• tool-use-basic.ts · templates/
• vision-image.ts · templates/
• wrangler.jsonc · templates/

SKILL.md (first lines)

# Claude API - Structured Outputs & Error Prevention Guide

**Package**: @anthropic-ai/sdk@0.70.1 (Nov 20, 2025)
**Breaking Changes**: Oct 2025 - Claude 3.5/3.7 models retired, Nov 2025 - Structured outputs beta
**Last Updated**: 2025-11-22

---

## What's New in v0.69.0+ (Nov 2025)

**Major Features:**

### 1. Structured Outputs (v0.69.0, Nov 14, 2025) - CRITICAL ⭐

**Guaranteed JSON schema conformance** - Claude's responses strictly follow your JSON schema with two modes:

**JSON Outputs (`output_format`)** - For data extraction and formatting:
```typescript
import Anthropic from '@anthropic-ai/sdk';

const anthropic = new Anthropic({
  apiKey: process.env.ANTHROPIC_API_KEY,
});

const message = await anthropic.messages.create({
  model: 'claude-sonnet-4-5-20250929',
  max_tokens: 1024,
  messages: [{ role: 'user', content: 'Extract contact info: John Doe, john@example.com, 555-1234' }],
  betas: ['structured-outputs-2025-11-13'],
  output_format: {
    type: 'json_schema',
    json_schema: {
      name: 'Contact',
      strict: true,
      schema: {
        type: 'object',
        properties: {
          name: { type: 'string' },
          email: { type: 'string' },
          phone: { type: 'string' }
        },
        required: ['name', 'email', 'phone'],
        additionalProperties: false
      }
    }
  }
});

// Guaranteed valid JSON matching schema
const contact = JSON.parse(message.content[0].text);
console.log(contact.name); // "John Doe"
```

**Strict Tool Use (`strict: true`)** - For validated function parameters:
```typescript
const message = await anthropic.messages.create({
  model: 'claude-sonnet-4-5-20250929',
  max_tokens: 1024,
  messages: [{ role: 'user', content: 'Get weather for San Francisco' }],
  betas: ['structured-outputs-2025-11-13'],
  tools: [{
    name: 'get_weather',
    description: 'Get current weather',
    input_schema: {
      type: 'object',
      properties: {
        location: { type: 'string' },
        unit: { type: 'string', enum: ['celsius', 'fahrenheit'] }
      },
      required: ['location'],
      additionalProperties: false
    },
    strict: true  // ← Guarantees schema compliance
  }]
});
```

**Requirements:**
- **Beta header**: `structured-outputs-2025-11-13` (via `betas` array)
- **Models**: Claude Sonnet 4.5, Claude Opus 4.1 only
- **SDK**: v0.69.0+ required

**Limitations:**
- ❌ No recursive schemas
- ❌ No numerical constraints (`minimum`, `maximum`)
- ❌ Limited regex support (no backreferences/lookahead)
- ❌ Incompatible with citations and message prefilling
- ⚠️ Grammar compilation adds latency on first request (cached 24hrs)

**When to Use:**
- Data extraction from unstructured text
- API response formatting
- Agentic workflows requiring validated tool inputs
- Eliminating JSON parse errors

### 2. Model Changes (Oct 2025) - BREAKING

**Retired (return errors):**
- ❌ Claude 3.5 Sonnet (all versions)
- ❌ Claude 3.7 Sonnet - DEPRECATED (Oct 28, 2025)

**Active Models (Nov 2025):**

| Model | ID | Context | Best For | Cost (per MTok) |
|-------|-----|---------|----------|-----------------|
| **Claude Sonnet 4.5** | claude-sonnet-4-5-20250929 | 200k | Balanced performance | $3/$15 (in/out) |
| **Claude Opus 4** | claude-opus-4-20250514 | 200k | Highest capability | $15/$75 |
| **Claude Haiku 4.5** | claude-3-5-haiku-20241022 | 200k | Near-frontier, fast | $1/$5 |

### 3. Context Management (Oct 28, 2025)

**Clear Thinking Blocks** - Automatic thinking block cleanup:
```typescript
const message = await anthropic.messages.create({
  model: 'claude-sonnet-4-5-20250929',
  max_tokens: 4096,
  messages: [{ role: 'user', content: 'Solve complex problem' }],
  betas: ['clear_thinking_20251015']
});

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