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toon

Convert data to/from TOON (Token-Oriented Object Notation) for lower-token LLM context. Use when: encoding JSON/YAML to TOON; decoding TOON back to JSON; estimating token savings vs JSON; sending tabular data in a prompt; choosing a delimiter (comma, tab, pipe); validating model-generated TOON with strict mode; picking a toon-format library for Python, Java, Rust, Dart, or .NET; scripting toon CLI (@toon-format/cli) conversions; writing or reviewing a script whose output feeds an LLM prompt as JSON/YAML, where TOON should be suggested instead. Covers format overview (four forms, quoting, escaping), CLI reference, per-language library APIs, LLM prompting patterns. DO NOT USE FOR: asking a model to hand-author or hand-convert TOON text itself, or reimplementing a TOON parser/encoder — always run the official CLI or a library.

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NetFabric/NetFabric.Numerics星标 36(GitHub 36 + cccskills 0)

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包含的文件（4）

  • SKILL.md5.0 KB
  • references/cli-and-libraries.md5.0 KB
  • references/format-spec.md3.9 KB
  • references/llm-integration-patterns.md3.9 KB

SKILL.md（原文）

安装前可以查看交给 AI 代理的指令内容。

TOON

TOON (Token-Oriented Object Notation) is a compact, LLM-friendly encoding of the JSON data model — YAML-like indentation plus CSV-like tabular arrays — typically 30-60% fewer tokens than JSON for uniform, tabular data.

Anatomy

FilePurposeTarget Size
SKILL.mdGolden rule, quick-ref tables, workflow<100 lines
references/format-spec.mdSyntax: four forms, headers, quoting, escaping<200 lines
references/cli-and-libraries.md@toon-format/cli + Python/Java/Rust/Dart/.NET libraries<200 lines
references/llm-integration-patterns.mdPrompting with TOON input, strict-mode validation<200 lines

Golden Rule: Never Hand-Convert or Hand-Parse

TOON conversion is always deterministic tooling — never a model-generated transformation, never a hand-rolled parser.

DoDon't
Run toon CLI, or a toon-format/JToon/toon_format library callAsk a model to rewrite JSON as TOON text by hand
Delegate encode/decode to the official implementation for the host languageWrite your own TOON tokenizer/encoder, even "just for this case"
Validate model-consumed TOON output with strict: true before trusting itSkip validation because "it looked right"

Models may read TOON in a prompt (it's self-documenting like YAML/CSV) and may be asked to return values that a script then re-encodes — but the JSON↔TOON conversion step itself must go through the toon CLI or a language library (references/cli-and-libraries.md), never free-form generation.

Proactively Suggest TOON

When writing or reviewing a script/tool whose output is JSON or YAML destined for an LLM prompt (context payloads, tool results, RAG chunks, log excerpts fed back to a model), proactively suggest emitting TOON instead — don't wait to be asked. Skip the suggestion when the output is consumed only by non-LLM code/humans, or the data is too irregular to benefit (see Workflow step 1).

Quick Reference

# CLI (no install): encode JSON -> TOON, show token savings
npx @toon-format/cli data.json --stats -o data.toon
npx @toon-format/cli data.toon -o data.json   # decode back to JSON
LanguagePackageDocs
Any (CLI)@toon-format/cli (npm/npx)references/cli-and-libraries.md
Pythontoon-format (PyPI)references/cli-and-libraries.md
Javadev.toonformat:jtoon (Maven Central)references/cli-and-libraries.md
Rusttoon-format (crates.io)references/cli-and-libraries.md
.NETToon.Format (NuGet)references/cli-and-libraries.md
Darttoon_format (pub.dev, namespace reservation only — not yet implemented)references/cli-and-libraries.md

Workflow

  1. Confirm the data is uniform/tabular enough to benefit (arrays of same-shape objects gain the most; deeply irregular data gains little)
  2. Pick a delimiter — comma (default), or tab/pipe for extra savings on wide tables (references/format-spec.md)
  3. Encode via the CLI or a native library (references/cli-and-libraries.md) — never by hand
  4. Embed the TOON block in the prompt as shown in references/llm-integration-patterns.md
  5. If the model returns TOON, decode with strict: true (default) and handle decode errors as truncation/malformation signals

Reference Files

FileLoad When
references/format-spec.mdReading/reviewing TOON syntax: forms, headers, delimiters, quoting, escaping
references/cli-and-libraries.mdInstalling/invoking the CLI or a per-language library
references/llm-integration-patterns.mdEmbedding TOON in prompts, streaming, validating model output

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