CSS MCP
A demo of how to build an MCP server (without just vibe coding).
What is CSS MCP?
CSS MCP is a Model Context Protocol (MCP) server that allows AI assistants like Claude, Cursor, and VS Code to demo of how to build an mcp server (without just vibe coding).
A demo of how to build an MCP server (without just vibe coding).
This server falls under the Developer Tools category on MCPgee, the world's largest MCP server directory with 33,000+ servers.
Features
- A demo of how to build an MCP server (without just vibe codi
Use Cases
Maintainer
Works with
Installation
Manual Installation
npx cssConfiguration
Configuration Details
claude_desktop_config.json
Performance
Response Metrics
Resource Usage
How to Set Up and Use CSS MCP
The CSS MCP Server is a structured tutorial and reference tool that helps developers learn modern CSS through an AI-powered coaching workflow. It provides three tools: fetching the latest CSS news and updates via OpenRouter/Perplexity, reading a persistent user knowledge profile, and writing confirmed learnings back to that profile. This makes it a practical example of how to build a stateful MCP server while also being genuinely useful as a CSS learning companion.
Prerequisites
- Node.js 18+ and npm installed
- An OpenRouter API key from openrouter.ai (used to fetch live CSS updates)
- An MCP-compatible client such as Claude Desktop or Cursor
Clone the repository
Clone the CSS MCP server repository and navigate into the project directory.
git clone https://github.com/3mdistal/css-mcp-server.git
cd css-mcp-serverInstall dependencies
Install all npm dependencies for the server.
npm installBuild the TypeScript project
Compile the TypeScript source into JavaScript before running.
npm run buildObtain an OpenRouter API key
Sign up at openrouter.ai and generate an API key. This key is required by the get_latest_updates tool to fetch current CSS news and browser compatibility data.
Configure Claude Desktop
Add the CSS tutor server to your Claude Desktop config, supplying your OpenRouter key as an environment variable.
{
"mcpServers": {
"css-tutor": {
"command": "node",
"args": ["/path/to/css-mcp-server/dist/index.js"],
"env": {
"OPENROUTER_API_KEY": "your-openrouter-api-key"
}
}
}
}CSS MCP Examples
Client configuration
Claude Desktop configuration for the CSS MCP server. Replace the path and API key with your actual values.
{
"mcpServers": {
"css-tutor": {
"command": "node",
"args": ["/path/to/css-mcp-server/dist/index.js"],
"env": {
"OPENROUTER_API_KEY": "sk-or-v1-your-openrouter-api-key"
}
}
}
}Prompts to try
Prompts that use the three tools exposed by the CSS MCP server.
- "What are the latest CSS features or updates I should know about?"
- "What CSS concepts have I already learned according to my profile?"
- "I just learned about CSS container queries — please update my knowledge profile."
- "Teach me one new CSS concept I haven't seen yet based on recent updates."Troubleshooting CSS MCP
get_latest_updates fails with an authentication error
Verify that OPENROUTER_API_KEY is correctly set in your MCP client config and that the key is active on openrouter.ai. Ensure there is no trailing whitespace in the key value.
'Cannot find module' error when starting the server
Run 'npm run build' to compile the TypeScript source. The dist/ directory must exist before the server can start. If it still fails, delete node_modules and re-run 'npm install && npm run build'.
Knowledge profile is empty or not persisting between sessions
The write_to_memory tool stores the profile in the css_knowledge_memory MCP resource. Confirm your client supports persistent MCP resources. If the profile resets, check that the client is not clearing its resource store between restarts.
Frequently Asked Questions about CSS MCP
What is CSS MCP?
CSS MCP is a Model Context Protocol (MCP) server that demo of how to build an mcp server (without just vibe coding). It connects AI assistants to external tools and data sources through a standardized interface.
How do I install CSS MCP?
Follow the installation instructions on the CSS MCP GitHub repository. Clone the repo, install dependencies, and add the server config to your AI client.
Which AI clients work with CSS MCP?
CSS MCP works with all major MCP-compatible AI clients including Claude Desktop, Claude Code, Cursor, VS Code (GitHub Copilot), Windsurf, and Cline.
Is CSS MCP free to use?
Yes, CSS MCP is open source and available under the MIT license. You can use it freely in both personal and commercial projects.
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Quick Config Preview
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