MCP Demo Project
A demonstration server implementing the Model Context Protocol (MCP) with both STDIO and Server-Sent Events (SSE) support, featuring a word reversal tool that transforms input text by reversing characters.
Category
Tools
reverse_word
Reverses the characters in a given word
README
🌟 MCP Demo Project 🌟
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🔄 Word Reversal Server with Server-Sent Events Support 🔄
A comprehensive demonstration of Model Context Protocol (MCP) server with Server-Sent Events (SSE) support and a word reversal tool.
🎨 Visual Architecture
┌─────────────────────────────────────────────────────────────────┐
│ 🌟 MCP DEMO ECOSYSTEM 🌟 │
├─────────────────────────────────────────────────────────────────┤
│ │
│ 📡 STDIO Mode 🌐 SSE Mode │
│ ┌─────────────┐ ┌─────────────┐ │
│ │ Client │◄─────STDIO─────►│ Client │ │
│ │ 📱 │ │ 📱 │ │
│ └─────────────┘ └─────────────┘ │
│ │ │ │
│ ▼ ▼ │
│ ┌─────────────┐ ┌─────────────┐ │
│ │ MCP Server │ │ MCP Server │ │
│ │ 🖥️ │ │ 🖥️ │ │
│ └─────────────┘ └─────────────┘ │
│ │ │ │
│ ▼ ▼ │
│ ┌─────────────────────────────────────────────────────────┐ │
│ │ 🔄 Word Reversal Tool 🔄 │ │
│ │ "hello" ➜ "olleh" │ │
│ │ "world" ➜ "dlrow" │ │
│ │ "demo" ➜ "omed" │ │
│ └─────────────────────────────────────────────────────────┘ │
└─────────────────────────────────────────────────────────────────┘
🚀 Features Showcase
🎯 FEATURES MATRIX
┌────────────────┬─────────────┬─────────────┐
│ Feature │ STDIO Mode │ SSE Mode │
├────────────────┼─────────────┼─────────────┤
│ MCP Protocol │ ✅ │ ✅ │
│ Word Reversal │ ✅ │ ✅ │
│ Type Safety │ ✅ │ ✅ │
│ Error Handling │ ✅ │ ✅ │
│ Health Check │ ❌ │ ✅ │
│ HTTP Endpoint │ ❌ │ ✅ │
│ Real-time │ ⚡ │ 🌊 │
└────────────────┴─────────────┴─────────────┘
📦 Quick Start
🔧 INSTALLATION STEPS
┌─────────────────────────────────────────┐
│ 1️⃣ npm install │
│ 2️⃣ npm run build │
│ 3️⃣ npm run demo:stdio OR │
│ npm run demo:sse │
└─────────────────────────────────────────┘
🎯 Usage Options
🔌 Option 1: STDIO Mode (Traditional MCP)
┌─────────────────────────────────────────────────────────────┐
│ 🔌 STDIO WORKFLOW │
├─────────────────────────────────────────────────────────────┤
│ │
│ Terminal 1: 🖥️ Server Terminal 2: 📱 Client │
│ ┌─────────────────────┐ ┌─────────────────────┐ │
│ │ npm run start │ │ npm run client │ │
│ │ │ ◄───► │ │ │
│ │ Server running... │ │ Testing tools... │ │
│ └─────────────────────┘ └─────────────────────┘ │
│ │
│ OR use combined command: │
│ 🚀 npm run demo:stdio │
└─────────────────────────────────────────────────────────────┘
🌐 Option 2: SSE Mode (Server-Sent Events)
┌─────────────────────────────────────────────────────────────┐
│ 🌐 SSE WORKFLOW │
├─────────────────────────────────────────────────────────────┤
│ │
│ Terminal 1: 🌊 SSE Server Terminal 2: 📡 SSE Client │
│ ┌─────────────────────┐ ┌─────────────────────┐ │
│ │ npm run start:sse │ │ npm run client:sse │ │
│ │ │ HTTP │ │ │
│ │ Port 3000 active... │ ◄───► │ Connecting via SSE │ │
│ │ Health: ✅ │ │ Testing tools... │ │
│ └─────────────────────┘ └─────────────────────┘ │
│ │
│ OR use combined command: │
│ 🚀 npm run demo:sse │
└─────────────────────────────────────────────────────────────┘
🛠️ Development Arsenal
⚡ DEVELOPMENT COMMANDS
┌────────────────────────────────────────────────────────────┐
│ │
│ 🔥 Hot Reload: │
│ ├─ npm run dev # STDIO server with auto-restart │
│ └─ npm run dev:sse # SSE server with auto-restart │
│ │
│ 🔍 Quality Checks: │
│ ├─ npm run typecheck # TypeScript validation │
│ ├─ npm run lint # Code style checking │
│ └─ npm run test # Test suite execution │
│ │
│ 🚀 Production: │
│ ├─ npm run build # Compile to JavaScript │
│ └─ npm run start # Production server │
└────────────────────────────────────────────────────────────┘
📁 Project Architecture
📂 PROJECT STRUCTURE
├── 📁 src/
│ ├── 🖥️ server.ts # MCP STDIO Server
│ ├── 🌐 sse-server.ts # MCP SSE Server
│ ├── 📱 client.ts # STDIO Test Client
│ └── 📡 sse-client.ts # SSE Test Client
├── 📁 dist/ # Compiled JavaScript
├── 📄 package.json # Dependencies & Scripts
├── 📄 tsconfig.json # TypeScript Config
├── 📄 eslint.config.js # Code Quality Rules
└── 📖 README.md # This beautiful file!
🎨 COMPONENT RELATIONSHIPS
┌─────────────────────────────────────────────────────────┐
│ │
│ 📱 client.ts ◄─────STDIO─────► 🖥️ server.ts │
│ │
│ 📡 sse-client.ts ◄───HTTP/SSE───► 🌐 sse-server.ts │
│ │
│ Both connect to: 🔄 Word Reversal Logic │
└─────────────────────────────────────────────────────────┘
🔧 API Documentation
🛠️ Available Tools
🔄 reverse_word Tool
┌─────────────────────────────────────────────────────────────┐
│ 🔄 WORD REVERSAL API │
├─────────────────────────────────────────────────────────────┤
│ │
│ 📥 INPUT: │
│ { │
│ "name": "reverse_word", │
│ "arguments": { │
│ "word": "hello" │
│ } │
│ } │
│ │
│ 📤 OUTPUT: │
│ { │
│ "content": [ │
│ { │
│ "type": "text", │
│ "text": "Reversed word: \"olleh\"" │
│ } │
│ ] │
│ } │
└─────────────────────────────────────────────────────────────┘
🌐 SSE Server Endpoints
🔗 ENDPOINT MAP
┌─────────────────────────────────────────────────────┐
│ │
│ 🏥 GET /health │
│ └─ Returns server health status │
│ │
│ 📡 GET /sse │
│ └─ Server-Sent Events MCP endpoint │
│ │
│ Example: http://localhost:3000/health │
│ Response: {"status": "healthy", "server": "..."} │
└─────────────────────────────────────────────────────┘
🧪 Testing Showcase
🔬 COMPREHENSIVE TEST SUITE
┌─────────────────────────────────────────────────────────────┐
│ │
│ ✅ Connection Tests ✅ Tool Discovery │
│ ├─ STDIO transport ├─ List available tools │
│ └─ SSE transport └─ Validate tool schemas │
│ │
│ ✅ Tool Execution ✅ Error Handling │
│ ├─ Word reversal ├─ Invalid inputs │
│ └─ Multiple test cases └─ Connection failures │
│ │
│ 🎯 TEST CASES: │
│ ┌─────────────────────────────────────────────────────┐ │
│ │ "hello" ➜ "olleh" "server" ➜ "revres" │ │
│ │ "world" ➜ "dlrow" "demo" ➜ "omed" │ │
│ │ "mcp" ➜ "pcm" "sse" ➜ "ess" │ │
│ └─────────────────────────────────────────────────────┘ │
└─────────────────────────────────────────────────────────────┘
🏗️ System Architecture
🔌 STDIO Mode Flow
🔄 STDIO COMMUNICATION FLOW
┌─────────────────────────────────────────────────────────────┐
│ │
│ 📱 Client Process │
│ ┌─────────────────┐ │
│ │ 1. List Tools │ │
│ │ 2. Call Tool │ │
│ │ 3. Get Response │ │
│ └─────────────────┘ │
│ │ │
│ ▼ STDIO Pipes │
│ ┌─────────────────┐ │
│ │ 🖥️ MCP Server │ ◄─────┐ │
│ │ ├─ Parse JSON │ │ │
│ │ ├─ Route Tool │ │ │
│ │ └─ Send Result │ │ │
│ └─────────────────┘ │ │
│ │ │ │
│ ▼ │ │
│ ┌─────────────────┐ │ │
│ │ 🔄 Word Tool │ ──────┘ │
│ │ reverse("hi") │ │
│ │ returns "ih" │ │
│ └─────────────────┘ │
└─────────────────────────────────────────────────────────────┘
🌐 SSE Mode Flow
🌊 SERVER-SENT EVENTS FLOW
┌─────────────────────────────────────────────────────────────┐
│ │
│ 📡 SSE Client │
│ ┌─────────────────┐ │
│ │ 1. HTTP Connect │ │
│ │ 2. SSE Stream │ │
│ │ 3. JSON-RPC │ │
│ └─────────────────┘ │
│ │ │
│ ▼ HTTP/SSE │
│ ┌─────────────────┐ │
│ │ 🌐 HTTP Server │ │
│ │ ├─ Port 3000 │ │
│ │ ├─ /health │ ◄─────┐ │
│ │ └─ /sse │ │ │
│ └─────────────────┘ │ │
│ │ │ │
│ ▼ │ │
│ ┌─────────────────┐ │ │
│ │ 🔄 Word Tool │ ──────┘ │
│ │ reverse("mcp") │ │
│ │ returns "pcm" │ │
│ └─────────────────┘ │
└─────────────────────────────────────────────────────────────┘
🔒 Security & Quality
🛡️ SECURITY FEATURES
┌─────────────────────────────────────────────────────────────┐
│ │
│ ✅ Input Validation ✅ Type Safety │
│ ├─ Zod schema validation ├─ Full TypeScript coverage │
│ └─ Parameter sanitization └─ Compile-time checks │
│ │
│ ✅ Error Handling ✅ No Secrets │
│ ├─ Graceful failures ├─ Environment variables │
│ └─ Detailed error logs └─ Configuration files │
│ │
│ 🏆 QUALITY METRICS: │
│ ┌─────────────────────────────────────────────────────┐ │
│ │ 📏 All files < 500 lines │ │
│ │ 🔧 Modular architecture │ │
│ │ 📚 Comprehensive documentation │ │
│ │ 🧪 Test coverage for all features │ │
│ └─────────────────────────────────────────────────────┘ │
└─────────────────────────────────────────────────────────────┘
🚀 Command Reference
📋 COMPLETE SCRIPT REFERENCE
┌────────────────────┬─────────────────────────────────────────┐
│ Command │ Description │
├────────────────────┼─────────────────────────────────────────┤
│ npm run build │ 🔨 Compile TypeScript → JavaScript │
│ npm run start │ 🖥️ Start STDIO MCP server │
│ npm run start:sse │ 🌐 Start SSE MCP server (port 3000) │
│ npm run dev │ 🔥 STDIO server with hot reload │
│ npm run dev:sse │ 🌊 SSE server with hot reload │
│ npm run client │ 📱 Run STDIO test client │
│ npm run client:sse │ 📡 Run SSE test client │
│ npm run demo:stdio │ 🚀 Demo STDIO (server + client) │
│ npm run demo:sse │ 🌟 Demo SSE (server + client) │
│ npm run test │ 🧪 Run test suite │
│ npm run lint │ 🔍 Code quality check │
│ npm run typecheck │ ✅ TypeScript validation │
│ npm run test-demo │ 🎯 Complete demo test │
└────────────────────┴─────────────────────────────────────────┘
🎨 Demo in Action
🎬 LIVE DEMO EXAMPLE
┌─────────────────────────────────────────────────────────────┐
│ │
│ $ npm run demo:sse │
│ │
│ 🚀 Starting MCP SSE Client Tests │
│ │
│ 🏥 Server health: { status: "healthy" } │
│ ✅ Connected to MCP SSE server │
│ │
│ 📚 Available tools: │
│ - reverse_word: Reverses characters using SSE │
│ │
│ 🔄 Testing SSE word reversal with: "sse" │
│ ✨ Result: [SSE] Reversed word: "ess" (original: "sse") │
│ │
│ 🔄 Testing SSE word reversal with: "server" │
│ ✨ Result: [SSE] Reversed word: "revres" (orig: "server") │
│ │
│ ✅ All SSE tests completed! │
└─────────────────────────────────────────────────────────────┘
🌈 Technology Stack
🔧 TECH STACK RAINBOW
┌─────────────────────────────────────────────────────────────┐
│ │
│ 🟦 TypeScript ├─ Type safety & modern JS │
│ 🟩 Node.js ├─ Runtime environment │
│ 🟨 MCP SDK ├─ Model Context Protocol │
│ 🟪 Zod ├─ Schema validation │
│ 🟧 ESLint ├─ Code quality │
│ 🟥 npm ├─ Package management │
│ │
│ 📡 Transports: │
│ ├─ 🔌 STDIO # Standard input/output pipes │
│ └─ 🌐 SSE # Server-Sent Events over HTTP │
└─────────────────────────────────────────────────────────────┘
📝 License & Contributing
📄 MIT LICENSE
┌─────────────────────────────────────────────────────────────┐
│ │
│ 🎉 Feel free to use this demo as a foundation for your │
│ own MCP projects! │
│ │
│ 🤝 CONTRIBUTING: │
│ ├─ This is a demo showcasing MCP capabilities │
│ ├─ Extend it with additional tools and features │
│ ├─ Share your improvements with the community │
│ └─ Report issues and suggest enhancements │
│ │
│ 🌟 ENJOY BUILDING WITH MCP! 🌟 │
└─────────────────────────────────────────────────────────────┘
🎯 What's Next?
🚀 FUTURE ENHANCEMENTS
┌─────────────────────────────────────────────────────────────┐
│ │
│ 💡 Possible Extensions: │
│ ├─ 🔤 Text processing tools (uppercase, lowercase) │
│ ├─ 🧮 Math calculation tools │
│ ├─ 📅 Date/time utilities │
│ ├─ 🔐 Encoding/decoding tools │
│ ├─ 📊 Data validation tools │
│ └─ 🌍 Multi-language support │
│ │
│ 🎮 Try adding your own tools and see the magic happen! │
└─────────────────────────────────────────────────────────────┘
<div align="center">
🌟 Built with SPARC Methodology 🌟
Specification → Pseudocode → Architecture → Refinement → Completion
Happy coding! 🚀
</div>
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