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rubiks-cube-solver: Skill for Claude Code

.agents/skills/cube-engine/SKILL.md

cube-engine is a skill for Claude Code, Codex from williamisnotdefined/rubiks-cube-solver. It costs 20 tokens per session (2,901 once invoked), scanned A, original, MIT.

A Rust engine for representing and validating a Rubik's Cube, including its state, moves, notation, and scrambles. Rust is a programming language designed for programs that need predictable and efficient execution.

In plain words
What is it for?
Use it when changing cube representation, move handling, move notation, scramble generation, or cube validation in the Rust engine.
Why use it?
It keeps the cube rules and state checks in a focused core so later solving algorithms can rely on valid, repeatable behavior.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: installed under .agents/ (shared by several agents).

This is williamisnotdefined/rubiks-cube-solver's own configuration. It tells Claude Code and Codex how to work on rubiks-cube-solver 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 rubiks-cube-solver configures →

not rated 5repo 4d ago A scan 20 tokens original MIT
View source ↗ williamisnotdefined/rubiks-cube-solver
Reuse

Borrowing it

Nothing to install: this file belongs to williamisnotdefined/rubiks-cube-solver. 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/williamisnotdefined/rubiks-cube-solver/main/.agents/skills/cube-engine/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/williamisnotdefined/rubiks-cube-solver

Made for: Claude Code, 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 cube-engine

README.md
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Your own site
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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 cube-engine

Your own site · 80×15
<a href="https://agentmods.dev/skills/williamisnotdefined/rubiks-cube-solver/cube-engine"><img src="https://agentmods.dev/badge/skills/williamisnotdefined/rubiks-cube-solver/cube-engine.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 20 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,901 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 original 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 $0.00020 $0.02901
Opus 5.5 $0.00008 $0.01160
Sonnet 5.5 $0.00004 $0.00580
Haiku 4.5 $0.00002 $0.00290

Measured 2mo ago against content hash 5ba9b2b1d7f9, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

cube-engine 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 2mo 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/cube-engine/SKILL.md · 274 lines

How it starts

The opening of the file, as written. The whole thing — 274 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Generated from ai/registry.json. Do not edit manually.

Canonical skill: ../../../ai/skills/cube-engine.md.

Referenced context:

  • ../../../ai/rules/cube-engine-rules.md
  • ../../../ai/rules/testing-rules.md
  • ../../../ai/architecture/project-architecture.md
  • ../../../ai/architecture/cube-engine.md
  • ../../../ai/glossary/cube-terms.md

This file is compiled from canonical AI knowledge files. Edit canonical files under ai, then run npm run ai:sync.

Compiled AI Skill: cube-engine

Canonical Skill: ai/skills/cube-engine.md

Cube Engine

Use this skill when adding or changing the Rust cube representation, moves, notation, scrambles, or cube validation.

Goal

Build the pure Rust engine first, using cubie representation and deterministic behavior that later search algorithms can trust.

Read First

  • ai/rules/cube-engine-rules.md
  • ai/rules/testing-rules.md
  • ai/architecture/project-architecture.md
  • ai/architecture/cube-engine.md
  • ai/glossary/cube-terms.md

Workflow

  • Keep work inside crates/cube-engine unless a current boundary requires otherwise.
  • Start with cubie state invariants before adding higher-level algorithms.
  • Keep notation parsing and state mutation separate.
  • Add tests for solved state, move/inverse behavior, and invalid notation as behavior appears.
  • Fail explicitly for bootstrap placeholders rather than silently producing incorrect cube states.

Expected Output

  • Primary state remains corner/edge permutation and orientation.
  • Move behavior is reversible and tested when implemented.
  • No JavaScript visualization dependency enters the Rust engine.

Verification

  • Run cargo test -p cube-engine when Rust is installed.
  • If Rust is unavailable, state the environment blocker clearly.

Referenced Context

Reference: ai/rules/cube-engine-rules.md

Cube Engine Rules

Rules for the Rust cube engine.

Always

  • Use cubie representation as the primary state model: corner permutation, corner orientation, edge permutation, and edge orientation.
  • Keep move application pure and deterministic.
  • Make every implemented move reversible and test the inverse path.
  • Validate state invariants before solver algorithms depend on them.
  • Keep notation parsing separate from state mutation.
  • Keep serialization explicit and stable once external consumers exist.
  • When adding puzzles beyond 3x3, keep each puzzle's state representation, move model, notation parser, validator, and solver strategy puzzle-specific.

Read the full file on GitHub · 274 lines

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. 2mo ago First seen · 274 lines · 20 tokens per session scan A 5ba9b2b1d7f9

Subscribe to this mod's changes

cube-engine is a skill published in the GitHub repository williamisnotdefined/rubiks-cube-solver (5 stars, last pushed 4d ago), licensed MIT. It adds 20 tokens to every session and 2,901 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 2026-08-31.

Game development
Related

cube-engine compared with skills from other repositories

cube-engine next to 6 skills from other repositories
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cube-enginewilliamisnotdefined/rubiks-cube-solverSkill54d agoMITA20Claude Code, Codex
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unity-addressablesBesty0728/Unity-SkillsSkill1.9kyesterdayMITA25Claude Code, Codex
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