toon-format

Convert large JSON datasets into a compact TOON format for LLM prompts.

2|Updated Dec 18, 2025
One-click install
npx skills add https://github.com/mattjoyce/toon-format-skill --skill toon-format-mattjoyce
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: toon-format
Source: https://github.com/mattjoyce/toon-format-skill/tree/main
Command: npx skills add https://github.com/mattjoyce/toon-format-skill --skill toon-format-mattjoyce

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes scripts (resource) and references (resource) components.

What problem does it solve?

Manipulating large JSON datasets for LLM prompts can often be inefficient and error-prone. This Skill streamlines conversion to a compact, token-efficient format and ensures data integrity.

Core Features & Use Cases

  • JSON↔TOON Conversion: Seamlessly encode or decode structured data using the official CLI or scripts, optimizing token usage for Large Language Model prompts.
  • Validation & Guardrails: Enforce [N] row counts and {fields} headers, reducing model drift and ensuring data consistency.
  • Use Case: When preparing large tabular datasets for an LLM, convert verbose JSON arrays into a compressed TOON format that maintains schema clarity and reduces prompt token count.

Quick Start

Use the provided script to convert a JSON file into the TOON format, validating structure and minimizing tokens in your prompts.

Frequently Asked Questions about toon-format

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I convert large JSON datasets into a compact format for LLM prompts?

You can convert large JSON datasets into a compact, schema-aware TOON format to optimize token usage for LLM prompts. This conversion maintains data integrity while reducing the token count of verbose JSON arrays.

What's the best way to validate structured JSON data before using it in an LLM prompt?

Validating structured JSON data is done by enforcing row counts and field headers as guardrails. This schema-aware validation reduces model drift and ensures data consistency before integration into AI prompting workflows.

Can I automate JSON to TOON conversion within a CLI or scripting workflow?

Yes, you can automate JSON to TOON conversion using the provided scripts or the official CLI. This facilitates seamless integration into data pipelines and scripting workflows for automated validation and token optimization.

Why does using raw JSON for large tabular datasets cause token inefficiency in LLMs?

Using raw JSON for large tabular datasets causes token inefficiency due to verbose syntax and repeated keys. Converting to the TOON format compresses the data while maintaining schema clarity, significantly reducing prompt token count.

Does TOON format conversion support machine learning data pipeline tasks?

Yes, TOON format conversion supports structured data scenarios in machine learning and data pipeline tasks. It streamlines the encoding and decoding of structured data, ensuring data integrity and token efficiency for automation.

What are the limitations of using a compact format for JSON data conversion?

A limitation of using a compact TOON format is that it requires schema-aware decoding to reconstruct the original JSON structure. Users must enforce row counts and field headers to prevent model drift and maintain data consistency.