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by Microsoft
by modelcontextprotocol
by robhunter
by hlydecker
opentabs-dev/opentabs
FreeNot checkedPlugin-based MCP server + Chrome extension that gives AI agents access to web applications through the user's authenticated browser session. 100+ plugins with a
About
Plugin-based MCP server + Chrome extension that gives AI agents access to web applications through the user's authenticated browser session. 100+ plugins with a plugin SDK for building new ones.
README
Your AI calls real web APIs through your browser session — no screenshots, no DOM scraping.
AI sending a Discord message and adding reactions — real API calls, not browser automation
How It Works
- Install the CLI and load the Chrome extension
- Connect — the extension bridges your browser to a local server
- Use — your AI calls web APIs through your authenticated session
No API keys. No OAuth setup. If you're logged in, your AI can use it.
Works with any MCP client. Don't want MCP? Use CLI mode instead.
Quick Start
Requires Node.js 22+ and Chrome.
npm install -g @opentabs-dev/cli
opentabs start
Load the extension from ~/.opentabs/extension in chrome://extensions/ (Developer mode → Load unpacked).
opentabs plugin install <plugin-name>
Full walkthrough: Quick Start guide
What You Get
100+ plugins, ~2,000 tools. Slack, Discord, GitHub, Jira, Notion, Figma, AWS, Stripe, and a lot more. One command to install, works immediately.
Built-in browser tools. Screenshots, clicking, typing, network capture — works on any tab, no plugin needed.
Build your own. Scaffold a plugin in one command, publish to npm, anyone can install it. Or point your AI at any website — it discovers the APIs and builds the plugin for you. Plugin Development guide
Install a plugin, use it immediately — no restart needed
Security
- Everything starts off. No tool executes until you explicitly enable it.
- Code review built in. Your AI reviews the plugin source before you enable it.
- Version-aware. Permissions reset when a plugin updates.
- Three permission levels. Off, Ask (confirmation dialog), or Auto — per-plugin or per-tool.
- Runs locally. No cloud. Full audit log. Anonymous telemetry (opt-out).
Contributing
git clone https://github.com/opentabs-dev/opentabs.git
cd opentabs && npm install && npm run build
npm run dev # tsc watch + MCP server + extension
npm run check # build + type-check + lint + knip + test
Development Setup guide · Discord
License
MIT — Not affiliated with or endorsed by any third-party service. Full disclaimer.
Docs · Quick Start · Plugin Development · SDK Reference · Browser Tools · CLI Reference
Built with Claude Code, OpenCode, Ralph, and RetroUI.
Install opentabs-dev/opentabs in Claude Desktop, Claude Code & Cursor
Run in your terminal:
claude mcp add opentabs-dev-opentabs -- npx FAQ
Is opentabs-dev/opentabs MCP free?
Yes, opentabs-dev/opentabs MCP is free — one-click install via Unyly at no cost.
Does opentabs-dev/opentabs need an API key?
No, opentabs-dev/opentabs runs without API keys or environment variables.
Is opentabs-dev/opentabs hosted or self-hosted?
Self-hosted: the server runs locally on your machine via the install command above.
How do I install opentabs-dev/opentabs in Claude Desktop, Claude Code or Cursor?
Open opentabs-dev/opentabs on unyly.org, pick your client tab (Claude Desktop, Claude Code, Cursor) and press Install — the config is generated automatically, no JSON editing.
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