Opuspad — AI skill for Claude Code
A local-first, WYSIWYG Markdown editor for Chrome.
How to install Opuspad
This entry records only its repository, not the path inside it, so there is no
exact command to give. Open luanjunyi/opuspad and copy the folder into
~/.claude/skills/, or the file into ~/.claude/agents/.
What Opuspad does
A local-first, WYSIWYG Markdown editor for Chrome. Seamlessly edit local files with a Notion-like experience, designed for human-AI collaboration on CLAUDE.md and READMEs.
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README
OpusPad: A local-first, WYSIWYG Markdown editor for Chrome, built for the AI era

Value Proposition
OpusPad transforms your Chrome browser into a robust local file editor with a Notion-like WYSIWYG experience. Seamlessly edit Markdown files (like CLAUDE.md, specs, or READMEs) stored on your local disk, without needing to open a full IDE or rely on cloud services.
**🌐 Website:** [editor.dull.business](https://editor.dull.business)
Why OpusPad?
- Local-First: Your files stay on your disk. No cloud storage, no unnecessary uploads.
- WYSIWYG & Source Mode: Enjoy a beautiful Notion-like editing experience, or switch to the raw Markdown source mode when needed.
- AI-Ready: Perfect for managing and editing AI-generated content and specifications, like CLAUDE.md files, directly where you work.
- Chrome Integrated: Leverages the native File System Access API for direct local file manipulation.
- Lightweight: No need for heavy IDEs just to edit a few Markdown files.
Installation
1. Chrome Web Store (Recommended)
Install OpusPad directly from the [Chrome Web Store](https://chromewebstore.google.com/detail/opuspad/ephlhjlnpnjjnjgdohdnbknadhklcoag).
2. Developer Setup (for local development)
- Clone the repository:
git clone https://github.com/luanjunyi/opuspad.git - Navigate to the directory:
cd opuspad - Install dependencies:
npm install - Build the extension:
npm run build(This will generate adist/directory) - Load into Chrome:
- Open Chrome and navigate to
chrome://extensions/. - Enable "Developer mode".
- Click "Load unpacked" and select the
dist/directory.
- Open Chrome and navigate to
Use Cases
- Editing
CLAUDE.mdfiles for AI agent instructions. - Managing local specification documents.
- Quickly updating
README.mdfiles. - Any task requiring local Markdown file editing within Chrome.
Privacy
OpusPad is truly local-fir
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