What models support this skill?

This skill is designed for models that support Anthropic's structured output mode, specifically Claude 3.5 Sonnet (4.5) and Claude 3 Opus (4.1).

Can I use this for tool calling validation?

No, this skill is specifically for JSON output mode. For tool parameter validation and agentic workflows, you should use the 'strict-tool-implementer' skill.

What are the limitations of the JSON schema features?

It does not currently support recursive schemas, specific min/max length constraints, or complex regex, as per the Anthropic JSON output limitations.

Does it support both Python and TypeScript?

Yes, it provides implementation patterns for both Pydantic in Python and Zod in TypeScript to ensure type safety across stacks.

How does it handle beta headers?

The skill automatically includes guidance on implementing the required 'structured-outputs-2025-11-13' beta header in your API requests.

JSON Outputs Implementer

Name: JSON Outputs Implementer
Author: cskiro

bycskiro

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API Development

Implements Anthropic's JSON outputs mode to guarantee schema-compliant data extraction and production-ready API responses.

JSON Outputs Implementer enables developers to leverage Anthropic's structured output mode, ensuring Claude's responses strictly adhere to predefined JSON schemas. It streamlines the process of extracting structured data from unstructured text or images, performing categorical classification, and generating production-ready API payloads using industry-standard libraries like Pydantic for Python and Zod for TypeScript. By providing patterns for schema design, validation, and error handling, this skill bridges the gap between raw LLM output and reliable, type-safe data integration.

Key Features

01Schema-first design using Pydantic (Python) and Zod (TypeScript) integration

02Support for Claude Sonnet 4.5 and Opus 4.1 structured output betas

03Optimized data extraction strategies for text and images

042 GitHub stars

05Production-ready validation and error handling patterns

06Comprehensive workflow for schema testing and production optimization

Use Cases

01Extracting structured business details from raw invoices or receipts

02Formatting complex AI-generated reports into valid JSON for frontend rendering

03Classifying support tickets into guaranteed categories for database storage

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add cskiro/claudex json-outputs-implementer

For use in Claude.ai and ChatGPT

Download Skill