Skill

toon-format

Provides syntax rules, quoting conventions, examples, and validation for writing, parsing, and generating TOON files including org-patterns.toon and JSON conversions.

developer-tools

npx claudepluginhub closedloop-ai/claude-plugins --plugin self-learning

Tool Access

This skill uses the workspace's default tool permissions.

Preview

TOON is a compact, human-readable encoding of the JSON data model optimized for LLM prompts. It achieves ~40% token reduction compared to JSON while maintaining lossless round-trip compatibility.

Supporting Assets

references/examples.md

SKILL.md

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Parent Repo Stars83

Parent Repo Forks4

Last CommitMar 5, 2026

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TOON Format (Token-Oriented Object Notation)

TOON is a compact, human-readable encoding of the JSON data model optimized for LLM prompts. It achieves ~40% token reduction compared to JSON while maintaining lossless round-trip compatibility.

Core Syntax Rules

Array Declaration

Arrays use bracketed headers with mandatory length count:

tags[3]: admin,ops,dev

Tabular Arrays (Uniform Object Arrays)

For arrays of objects with identical structure, use field headers in braces:

patterns[2]{id,category,summary}:
  P-001,pattern,"Use tokens for colors"
  P-002,mistake,"Check auth before routes"

Field names declared once in {...} after the count
Each row contains values in declared field order
Rows indented with 2 spaces (NEVER tabs)

Objects

Objects use indentation-based nesting (2 spaces per level):

user:
  id: 123
  name: Ada

Quoting Rules (Critical)

Strings MUST be quoted if they contain:

The active delimiter (comma by default)
Empty string, leading/trailing whitespace
Reserved literals (true, false, null)
Numeric-like patterns
Colons, quotes, backslashes, brackets, braces
Control characters or leading hyphens

Escape sequences: \\, \", \n, \r, \t

org-patterns.toon Format

Standard format for ClosedLoop organization learnings:

patterns[N]{id,category,summary,confidence,seen_count,success_rate,flags,applies_to,context,repo}:
  P-001,pattern,"Summary here",high,5,0.85,,implementation-subagent,UI|styling,*
  P-002,mistake,"Check auth before routes",medium,3,0.60,[REVIEW],*,auth|routes,astoria-frontend

Field notes:

summary - Always quoted (contains natural language with commas)
flags - [REVIEW], [STALE], [UNTESTED], [PRUNE], or empty
applies_to - Pipe-separated agent names or * for all
context - Pipe-separated tags
repo - Repository name (derived from git remote basename) or * for all repos

Validation Checklist

Count matches actual rows/items
Field count in rows matches declaration
Strings needing quotes are quoted
2-space indentation (no tabs)
No blank lines within array blocks

References

See references/examples.md for comprehensive examples
TOON Specification
Reference Implementation