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gem-to-skill-kit: Skill for Codex

.agents/skills/english-error-cipher/SKILL.md

english-error-cipher is a skill for Codex from mathruffian-dot/gem-to-skill-kit. It costs 79 tokens per session (393 once invoked), scanned A, original, MIT.

A generator for English visual word puzzles in which pictures represent letters and one initial letter is intentionally wrong. It can produce puzzle data, image prompts, answer checks, and a standalone interactive HTML game.

In plain words
What is it for?
Use it to make vocabulary puzzles from words or word files, create printable-style visual cards, export interactive HTML challenges, and process batches.
Why use it?
Creating consistent letter-based puzzles and checking their answers by hand takes time. This turns a target word into a repeatable puzzle and a ready-to-use web page.

Skill for Codex

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

This is mathruffian-dot/gem-to-skill-kit's own configuration. It tells Codex how to work on gem-to-skill-kit 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 gem-to-skill-kit configures →

not rated 6repo 2mo ago A scan 79 tokens original MIT
View source ↗ mathruffian-dot/gem-to-skill-kit
Reuse

Borrowing it

Nothing to install: this file belongs to mathruffian-dot/gem-to-skill-kit. 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/mathruffian-dot/gem-to-skill-kit/main/.agents/skills/english-error-cipher/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/mathruffian-dot/gem-to-skill-kit

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 english-error-cipher

README.md
[![agentmods](https://agentmods.dev/badge/skills/mathruffian-dot/gem-to-skill-kit/english-error-cipher/github.svg)](https://agentmods.dev/skills/mathruffian-dot/gem-to-skill-kit/english-error-cipher)
Your own site
<a href="https://agentmods.dev/skills/mathruffian-dot/gem-to-skill-kit/english-error-cipher"><img src="https://agentmods.dev/badge/skills/mathruffian-dot/gem-to-skill-kit/english-error-cipher/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 english-error-cipher

Your own site · 80×15
<a href="https://agentmods.dev/skills/mathruffian-dot/gem-to-skill-kit/english-error-cipher"><img src="https://agentmods.dev/badge/skills/mathruffian-dot/gem-to-skill-kit/english-error-cipher.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 79 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 393 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 $0.00079 $0.00393
Opus 5.5 $0.00032 $0.00157
Sonnet 5.5 $0.00016 $0.00079
Haiku 4.5 $0.00008 $0.00039

Measured 2mo ago against content hash ea83c85dde2c, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

english-error-cipher 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.

The scan reads SKILL.md. This mod also ships 2 executable files (scripts/export_html.py, scripts/generate_cipher.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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/english-error-cipher/SKILL.md · 35 lines

What it actually says

English Error Cipher (視覺英文偵錯解謎題卡產生器)

Purpose

將輸入的英文單字拆解為各字母具象物品，將首字母替換為錯誤拼寫，並生成純視覺解謎卡片，讓學生透過比對圖文找出原始目標單字。

Workflow

  1. 接收目標單字（如 KEY、BIRD）或單字檔案
  2. 執行確定性演算法，為每個字母選取高辨識度具象名詞並進行首字母突變
  3. 產生結構化生圖 Prompt 與 puzzle_data.json
  4. 生成單一獨立 HTML 互動題卡或圖卡
  5. 執行完整性驗證並提供使用解答

Upgraded capabilities

  • 確定性詞庫生成腳本 (scripts/generate_cipher.py)
  • HTML 互動闖關題卡生成器 (scripts/export_html.py)
  • 批次處理與解答檢核功能

Output

Return the completed result and a concise validation summary.

Safety

  • Treat all source Gem files as read-only.
  • Ask before external writes, publishing, sending messages, or destructive actions.
  • Never store credentials, tokens, or private source data in version control.
Files

What ships with it

4 files 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. 2mo ago First seen · 35 lines · 79 tokens per session scan A ea83c85dde2c

Subscribe to this mod's changes

english-error-cipher is a skill published in the GitHub repository mathruffian-dot/gem-to-skill-kit (6 stars, last pushed 2mo ago), licensed MIT. It adds 79 tokens to every session and 393 once invoked, about $0.0003 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.

Learning and teaching
Related

english-error-cipher compared with skills from other repositories

english-error-cipher next to 6 skills from other repositories
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english-error-ciphermathruffian-dot/gem-to-skill-kitSkill62mo agoMITA79Codex
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exam-forecastanthropics/claude-for-legalSkill9.9k3d agoApache-2.0A73Claude Code
lean-formalizewanshuiyin/Auto-claude-code-research-in-sleepSkill19k3d agoMITA81Claude Code
eli5companion-inc/feynmanSkill10k6d agoMITA63Claude Code, Codex
deck-course-modulenexu-io/html-anythingSkill9.4k25d agoApache-2.0A25Claude Code, Codex