toon-formatter

AGGRESSIVELY use TOON v2.0 format for biggish regular data (≥5 items, ≥60% uniform). Auto-applies to tables, logs, events, transactions, analytics, API responses, database results. Supports 3 array types (inline, tabular, expanded), 3 delimiters (comma, tab, pipe), key folding for nested objects. Triggers on structured data, arrays, repeated patterns. Use TOON by default when tokens matter - RAG pipelines, tool calls, agents, benchmarks. Keywords "data", "array", "list", "table", "log", "transaction", "metric", "analytics", "API", "database", "query", "TOON".

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Install this agent skill to your Project

npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/development/toon-formatter-raintree-technology-claude-sta

SKILL.md

TOON v2.0 Formatter

AGGRESSIVELY apply TOON format to save 30-60% tokens on structured data.

When to Use

YES - Use automatically:

Arrays with ≥5 similar items
Tables, logs, events, transactions, analytics
API responses with ≥60% field uniformity
Database results, metrics, benchmarks

NO - Keep as JSON:

Small arrays (<5 items)
Deeply nested or non-uniform data
Narrative text, instructions

Quick Reference

Tabular (uniform objects):

[3]{id,name,role}:
  1,Alice,admin
  2,Bob,user
  3,Carol,user

Inline (primitives ≤10):

tags[4]: js,react,node,api

Delimiters: comma (default), tab [N\t], pipe [N|]

Key folding (nested objects):

server.host: localhost
server.port: 8080

Binary Encoder (20x faster)

bash

# Encode JSON to TOON
.claude/skills/toon-formatter/bin/toon encode data.json

# With options
.claude/skills/toon-formatter/bin/toon encode data.json --delimiter tab --key-folding

# Check if TOON recommended
.claude/skills/toon-formatter/bin/toon check data.json

# Decode TOON to JSON
.claude/skills/toon-formatter/bin/toon decode data.toon

Commands

/toon-encode <file> - JSON to TOON
/toon-decode <file> - TOON to JSON
/toon-validate <file> - Validate TOON
/analyze-tokens <file> - Compare savings
/convert-to-toon <file> - Full conversion workflow

Documentation

Complete Guide: docs/toon-guide.md
Build Instructions: docs/INSTALL.md
Source Code: src/toon.zig
Spec: https://github.com/toon-format/spec