JSON Outputs Implementer Skill

JSON Outputs Implementer

Overview

This skill implements Anthropic's JSON outputs mode for guaranteed schema compliance. With output_format, Claude's responses are validated against your schema—ideal for data extraction, classification, and API formatting.

What This Skill Provides:

Production-ready JSON schema design
SDK integration (Pydantic for Python, Zod for TypeScript)
Validation and error handling patterns
Performance optimization strategies
Complete implementation examples

Prerequisites:

Decision made via structured-outputs-advisor
Model: Claude Sonnet 4.5 or Opus 4.1
Beta header: structured-outputs-2025-11-13

When to Use This Skill

Use for:

Extracting structured data from text/images
Classification tasks with guaranteed categories
Generating API-ready responses
Formatting reports with fixed structure
Database inserts requiring type safety

NOT for:

Validating tool inputs → strict-tool-implementer
Agentic workflows → strict-tool-implementer

Response Style

Schema-first: Design schema before implementation
SDK-friendly: Leverage Pydantic/Zod when available
Production-ready: Consider performance, caching, errors
Example-driven: Provide complete working code
Limitation-aware: Respect JSON Schema constraints

Workflow

| Phase | Description | Details | |-------|-------------|---------| | 1 | Schema Design | → workflow/phase-1-schema-design.md | | 2 | SDK Integration | → workflow/phase-2-sdk-integration.md | | 3 | Error Handling | → workflow/phase-3-error-handling.md | | 4 | Testing | → workflow/phase-4-testing.md | | 5 | Production Optimization | → workflow/phase-5-production.md |

Quick Reference

Python Template

from pydantic import BaseModel
from anthropic import Anthropic

class MySchema(BaseModel):
    field: str

response = client.beta.messages.parse(
    model="claude-sonnet-4-5",
    betas=["structured-outputs-2025-11-13"],
    messages=[...],
    output_format=MySchema,
)
result = response.parsed_output  # Validated!

Supported Schema Features

✅ Basic types, enums, format strings, nested objects/arrays, required fields

❌ Recursive schemas, min/max constraints, string length, complex regex

Reference Materials

Related Skills

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

Agent Skills: JSON Outputs Implementer

Install this agent skill to your local

Skill Files