JSON Outputs Implementer

Specialized skill for implementing JSON outputs mode with guaranteed schema compliance.

Purpose

This skill handles end-to-end implementation of JSON outputs mode (output_format), ensuring Claude's responses strictly match your JSON schema. Covers schema design, SDK integration, testing, and production deployment.

Use Cases

Data Extraction: Pull structured info from text/images
Classification: Categorize content with guaranteed output format
API Formatting: Generate API-ready JSON responses
Report Generation: Create structured reports
Database Operations: Ensure type-safe inserts/updates

Prerequisites

Routed here by structured-outputs-advisor
Model: Claude Sonnet 4.5 or Opus 4.1
Beta header: structured-outputs-2025-11-13

Quick Start

Python with Pydantic:

from pydantic import BaseModel
from anthropic import Anthropic

class Contact(BaseModel):
    name: str
    email: str

client = Anthropic()
response = client.beta.messages.parse(
    model="claude-sonnet-4-5",
    betas=["structured-outputs-2025-11-13"],
    messages=[{"role": "user", "content": "Extract contact..."}],
    output_format=Contact,
)

contact = response.parsed_output  # Guaranteed valid

TypeScript with Zod:

import { z } from 'zod';

const ContactSchema = z.object({
  name: z.string(),
  email: z.string().email(),
});

const response = await client.beta.messages.parse({
  model: "claude-sonnet-4-5",
  betas: ["structured-outputs-2025-11-13"],
  output_format: betaZodOutputFormat(ContactSchema),
  messages: [...]
});

What You'll Learn

Schema Design - Respecting JSON Schema limitations
SDK Integration - Pydantic/Zod helpers
Error Handling - Refusals, token limits, validation
Production Optimization - Caching, monitoring, cost tracking
Testing - Comprehensive validation strategies

Examples

contact-extraction.py - Extract contact info
invoice-extraction.py - Complex nested schemas

structured-outputs-advisor - Choose the right mode
strict-tool-implementer - For tool validation

Reference Materials

Version

Current version: 0.1.0

See CHANGELOG.md for version history.

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