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mazelingo: Instructions file for Claude Code

CLAUDE.md

mazelingo CLAUDE.md is an instructions file for Claude Code from Yeq6X/mazelingo. It costs 863 tokens per session, scanned A, original, MIT.

Project instructions for Mazelingo, a Chrome extension that shows web-page text as a sentence-by-sentence mix of two languages for language learning.

In plain words
What is it for?
Building, testing, type-checking, packaging, and maintaining the Mazelingo Chrome extension.
Why use it?
They give a coding agent the project’s structure, build commands, testing approach, and development rules so it can make changes consistently.

Instructions file for Claude Code

Written for Claude Code: the file is CLAUDE.md.

This is Yeq6X/mazelingo's own configuration. It tells Claude Code how to work on mazelingo 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 mazelingo configures →

not rated 24repo +1 13d ago A scan 863 tokens original MIT
View source ↗ Yeq6X/mazelingo mazelingo-web.pages.dev
Reuse

Borrowing it

Nothing to install: this file belongs to Yeq6X/mazelingo. 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/Yeq6X/mazelingo/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/Yeq6X/mazelingo

Made for: Claude Code.

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 mazelingo CLAUDE.md

README.md
[![agentmods](https://agentmods.dev/badge/instructions/yeq6x/mazelingo/claude-md.svg)](https://agentmods.dev/instructions/yeq6x/mazelingo/claude-md)
Your own site
<a href="https://agentmods.dev/instructions/yeq6x/mazelingo/claude-md"><img src="https://agentmods.dev/badge/instructions/yeq6x/mazelingo/claude-md.svg" alt="Measured on agentmods" height="20"></a>
Per session 863 This file is loaded in full into every session.
When invoked 863 The same file — it is already loaded in full.
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 $0.00863 $0.00863
Opus 5 $0.00432 $0.00432
Sonnet 5 $0.00173 $0.00173
Haiku 4.5 $0.00086 $0.00086

Measured 8d ago against content hash 18bbc709714c, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

mazelingo CLAUDE.md 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 8d 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.

CLAUDE.md · 41 lines

What it actually says

Mazelingo

Sentence-level bilingual mix translator。Webページのテキストを文単位で外国語とミックス表示する語学学習向けChrome拡張(Manifest V3)。

Chrome Web Store: https://chromewebstore.google.com/detail/mazelingo/bhdngeocokoeblnnlhjibojcadefimpi

ビルド・開発

npm install        # 依存: wxt, typescript, vitest, playwright (devDependencies)
npm run dev        # wxt (HMR付き開発サーバー)
npm run build      # wxt build → .output/chrome-mv3/ 生成
npm run build:local # 同上 + 直下へミラー。chrome://extensions で直下を読み込んでいる既存項目の「再読み込み」で反映(拡張IDと chrome.storage を維持)
npm run zip        # wxt zip → mazelingo.zip (Chrome Web Store配布用)
npm run compile    # tsc --noEmit (型チェック)
npm test           # vitest (ユニット/純ロジック + jsdom DOMテスト)
npm run test:e2e   # playwright (ビルド済み拡張を実ブラウザでE2E)
  • UIフレームワーク不使用のTypeScript(strict)。ビルドはWXT(エントリをバンドルし.output/に出力)
  • test/ に LLM モデル動作検証スクリプト (test_llm.ts, test_models.js, test_deepl.js)。ライブAPI要のため CI 対象外。.env にAPIキーを置いて実行(.env.example 参照)。npm run test:llm -- <model> <api-key>は本体のutils/llm.ts経由で1回翻訳する

構造

  • wxt.config.ts — manifest とビルド設定
  • entrypoints/background.ts — service worker。翻訳バッチ・2層キャッシュ・長ユニット再分割
  • entrypoints/content/index.ts + style.css — ページ注入(リーフブロック検出・改行境界での断片化)・翻訳表示UI(トグル/ツールチップ)
  • entrypoints/sidepanel/ — サイドパネルUI(設定/出力タブ、最大規模ファイル)
  • utils/llm.ts — OpenAI / Anthropic / Gemini / GLM / DeepSeek / OpenRouter のリクエストビルダーと呼び分け (callLLMChain)
  • utils/config.ts — デフォルト設定とマージ処理
  • utils/translation.ts / utils/content-logic.ts / utils/dom-overlay.ts — 純粋ロジック(テスト対象の seam)
  • utils/messages.ts — 3 コンテキスト間の型付きメッセージプロトコル
  • public/vocab_data.json / public/situations.json — 学習コンテンツ (web_accessible_resources)
  • docs/ — privacy-policy.md(ストア申請用)・スクリーンショット

ルール

  • APIキーはユーザーが設定画面から入力し Chrome Storage に保存する設計。ソースにハードコードしない
  • .env はローカル検証用(gitignore済み)。内容を転記・コミットしない
  • 翻訳の文分割は「読みの単位」: 改行(文末記号のあとは決定的、それ以外はLLM判断)・句読点・長文は節で分割。プロンプトは utils/translation.ts の buildTranslationMessages を参照
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. 8d ago First seen · 41 lines · 863 tokens per session scan A 18bbc709714c

Subscribe to this mod's changes

mazelingo CLAUDE.md is an instructions file published in the GitHub repository Yeq6X/mazelingo (24 stars, last pushed 13d ago), licensed MIT. It adds 863 tokens to every session, about $0.0043 per session on Opus 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 2026-08-30.

LLMLearning and teachingLocalizationchrome-extensionenglishjapaneselanguage-learningtranslation
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