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mutsu: Skill for Codex

.agents/skills/rakuast-implementation/SKILL.md

rakuast-implementation is a skill for Codex from tokuhirom/mutsu. It costs 33 tokens per session (882 once invoked), scanned A, original, Artistic-2.0.

A development workflow for implementing and investigating compatibility features in mutsu, a Raku-related project, using Rakudo as a reference implementation.

In plain words
What is it for?
Use it when working on RakuAST compatibility slices, bidirectional conversion, lowering, and regression tests.
Why use it?
It helps compare behavior with Rakudo, convert between representations, lower code, and catch regressions with focused tests.

Skill for Codex

Written for Codex: agents/openai.yaml present. Also seen: installed under .agents/ (shared by several agents).

This is tokuhirom/mutsu's own configuration. It tells Codex how to work on mutsu itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything mutsu configures →

not rated 30repo changed 1mo ago A scan 33 tokens Artistic-2.0
View source ↗ tokuhirom/mutsu tokuhirom.github.io
Reuse

Borrowing it

Nothing to install: this file belongs to tokuhirom/mutsu. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/tokuhirom/mutsu/main/.agents/skills/rakuast-implementation/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/tokuhirom/mutsu

Made for: Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for rakuast-implementation

README.md
[![agentmods](https://agentmods.dev/badge/skills/tokuhirom/mutsu/rakuast-implementation/github.svg)](https://agentmods.dev/skills/tokuhirom/mutsu/rakuast-implementation)
Your own site
<a href="https://agentmods.dev/skills/tokuhirom/mutsu/rakuast-implementation"><img src="https://agentmods.dev/badge/skills/tokuhirom/mutsu/rakuast-implementation/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for rakuast-implementation

Your own site · 80×15
<a href="https://agentmods.dev/skills/tokuhirom/mutsu/rakuast-implementation"><img src="https://agentmods.dev/badge/skills/tokuhirom/mutsu/rakuast-implementation.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 33 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 882 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin unknown No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00033 $0.00882
Opus 5.5 $0.00013 $0.00353
Sonnet 5.5 $0.00007 $0.00176
Haiku 4.5 $0.00003 $0.00088

Measured 1mo ago against content hash c9f03fdb4e09, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

rakuast-implementation scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.agents/skills/rakuast-implementation/SKILL.md · 83 lines

The source is not reproduced here

Licensed Artistic-2.0

The repository is licensed Artistic-2.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

Read it on GitHub

Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 1mo ago Changed · +1 lines c9f03fdb4e09
  2. 1mo ago Changed b82a9a7c1988
  3. 1mo ago Changed dbb5f0e08df9
  4. 2mo ago First seen · 82 lines · 33 tokens per session scan A fa837466a4d0

Subscribe to this mod's changes

rakuast-implementation is a skill published in the GitHub repository tokuhirom/mutsu (30 stars, last pushed today), licensed Artistic-2.0. It adds 33 tokens to every session and 882 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-04.

LanguagesTestingUnit testing
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