MCP - Model Context Protocol
MCP Server using TypeScript and JavaScript made with official MCP docs handling US Weather data having context for two tools - showing weather forecast and weather alerts for US based location. Used Zod for data validation and architectured two folders - src and build , development (ts) and production (js) respectively.
AdiGo22
README
MCP - Model Context Protocol
About MCP
The Model Context Protocol (MCP) is an open standard that enables developers to build secure, two-way connections between their data sources and AI-powered tools. The architecture is straightforward: developers can either expose their data through MCP servers or build AI applications (MCP clients) that connect to these servers.
MCP follows a client-server architecture where a host application can connect to multiple servers.
Architecture
src/ → TypeScript source
build/ → Compiled JavaScript
```bash
weather/
├── src/ # TypeScript source
│ └── index.ts
├── build/ # Compiled JavaScript
│ └── index.js
├── tsconfig.json
└── package.json
src/ Directory (TypeScript Source)
Purpose:
- Contains development-time code written in TypeScript
- You implement MCP protocol handlers here (Resources, Tools, Prompts)
- Also contains logic, type definitions, SDKs, etc.
Key Files:
index.ts→ Entry point for your MCP server- MCP concepts:
resources/→ MCP Resource implementationstools/→ LLM-callable functionsprompts/→ Prompt templates / management
build/ Directory (Compiled JavaScript)
Purpose:
- Holds runtime code after TS compilation
- This is the folder Claude Desktop interacts with via:
node build/index.js
Traits:
- Compiled, production-ready JavaScript
- No TS needed after this stage
- Clean deployable output
⚙️ Data Flow Pipeline
graph LR
A[Developer Writes TS Code] --> B[src/index.ts]
B --> C[TypeScript Compiler tsc]
C --> D[build/index.js]
D --> E[Node.js Runtime]
E --> F[Claude Desktop IPC]
What Happens After index.js
Once your index.js is ready, it flows like this:
Claude Desktop ↔ stdio ↔ Server Transport ↔ McpServer ↔ Tools (1)
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