TOON File Format Anatomy: Schema-Once, Data-Many for LLM Pipelines 🎯📄

If you work with RAG pipelines, agent tools, or LLM APIs, you’ve probably noticed something frustrating: sometimes the biggest cost in a prompt is not the data itself — it’s the repeated JSON structure wrapped around it. That is exactly the problem TOON tries to solve. TOON (Token-Oriented Object Notation) is a compact, human-readable encoding of the JSON data model designed for LLM prompts. It keeps the same logical structure as JSON, but reduces token overhead by declaring structure once and s