by ref-tools
Explore MCP-UI Widgets, a React UI library offering timers, stopwatches, and unit converters for dynamic, customizable R
Provides interactive HTML widgets for common tasks like timers, stopwatches, unit conversions, and fact displays that can be embedded in chat interfaces.
MCP-UI Widgets is a community-built MCP server published by ref-tools that provides AI assistants with tools and capabilities via the Model Context Protocol. Explore MCP-UI Widgets, a React UI library offering timers, stopwatches, and unit converters for dynamic, customizable R It is categorized under productivity. This server exposes 4 tools that AI clients can invoke during conversations and coding sessions.
You can install MCP-UI Widgets in your AI client of choice. Use the install panel on this page to get one-click setup for Cursor, Claude Desktop, VS Code, and other MCP-compatible clients. This server runs locally on your machine via the stdio transport. This server supports remote connections over HTTP, so no local installation is required.
Unlicense
MCP-UI Widgets is released under the Unlicense license. This is a permissive open-source license, meaning you can freely use, modify, and distribute the software.
Add new capabilities to Claude beyond text generation
Example
Access external data sources, execute code, interact with tools and services
Transform Claude from chatbot to action-taking agent
Provide Claude with access to relevant context and data
Example
Load project documentation, access knowledge bases, query databases
Get more accurate, context-aware responses
Automate multi-step workflows combining AI and external tools
Example
Research → Summarize → Create document → Send notification
Complete complex tasks end-to-end without manual steps
Share your MCP server with the developer community
Useful MCP listing: MCP-UI Widgets is the kind of server we cite when onboarding engineers to host + tool permissions.
MCP-UI Widgets is a well-scoped MCP server in the explainx.ai directory — install snippets and categories matched our Claude Code setup.
Strong directory entry: MCP-UI Widgets surfaces stars and publisher context so we could sanity-check maintenance before adopting.
I recommend MCP-UI Widgets for teams standardizing on MCP; the explainx.ai page compares cleanly with sibling servers.
I recommend MCP-UI Widgets for teams standardizing on MCP; the explainx.ai page compares cleanly with sibling servers.
Strong directory entry: MCP-UI Widgets surfaces stars and publisher context so we could sanity-check maintenance before adopting.
According to our notes, MCP-UI Widgets benefits from clear Model Context Protocol framing — fewer ambiguous “AI plugin” claims.
We wired MCP-UI Widgets into a staging workspace; the listing’s GitHub and npm pointers saved time versus hunting across READMEs.
According to our notes, MCP-UI Widgets benefits from clear Model Context Protocol framing — fewer ambiguous “AI plugin” claims.
MCP-UI Widgets reduced integration guesswork — categories and install configs on the listing matched the upstream repo.
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Add simple widgets to you LLM chat for common situations like timers, conversions and more.
Demo video: https://youtu.be/4gfom42vHkc
MCP-UI opens the door to breaking the text wall from chat UIs we've been using the last few years. The full extent of what's possible is
This project shows the floor of what's possible by providing a few simple widgets for common situations.
If you've ever google "convert X to Y" or "2 minute timer" and see the custom UI results, this should feel very familiar.
Timer - Editable timer with a chime.Stopwatch - Timer that just counts up.Conversion - Convert between set of units for which the LLM can write a formula.Display Fact - When the answer is simple, just show it in an easy to read card.MCP-UI is new and as of August 2025 is only supported by a few clients.
Try widget-mcp in the Smithery playground. (TODO: pending Smithery deploy)
Extensions and Add custom extensionWidgets and command npx widget-mcpChat and prompting 2 minute timer
Here's a few examples of widgets that could be fun to add.
I'm sure you have some cool ideas!
Adding new widgets should be very easy! All these widgets are HTML pages that can have variables injected (eg. values provided by the LLM). To add new widgets, add an template file to the html directory and a new tool to index.ts.
You can probably just prompt "Add a widget html and tool to do <somethingawesome>. Look at index.ts and timer.html for examples of how".
# Install dependencies
npm install
# Iterate on the html with hot-reloads
npm run dev:html
# Launch the MCP server with Smithery's web inspector
npm run dev:mcp
Prerequisites
Time Estimate
15-60 minutes depending on server complexity
Steps
Troubleshooting
✓ Do
✗ Don't
💡 Pro Tips
Architecture
Model Context Protocol standardizes how AI hosts (Claude, Cursor) communicate with external tools and data sources through server implementations.
Protocols
Compatibility
✓ Use when
Use when you need Claude to access external data, execute actions, or integrate with tools. Best for extending AI capabilities beyond conversation.
✗ Avoid when
Avoid when native integrations exist (use official APIs directly), for real-time critical systems, or when security/compliance requires zero external dependencies.