🧠 Model Context Protocol (MCP) - Server-Client Implementation

This project is a simple Model Context Protocol (MCP) system that includes an MCP Server and a MCP Client, communicating via Server-Sent Events (SSE) using FastAPI. It demonstrates lightweight tool invocation using SSE over HTTP.

🏗️ Architecture Overview

+-------------+                SSE HTTP                 +-------------+
|             | <------------------------------------>  |             |
| MCP CLIENT  |                                         | MCP SERVER  |
| (FastAPI)   |  /upload_claim  ⇄  upload_claim         | (SSE Tools) |
| Port: 5000  |  /get_claim_details ⇄ get_claim_details | Port: 8000  |
+-------------+                                         +-------------+

📁 Project Structure

.
├── client/                     # MCP Client (FastAPI app)
│   └──main.py
│
├── server/                     # MCP Server with SSE tools
│   └──main.py
|
└── README.md
└── requirements.txt

🔧 MCP Server

• Port: 8000
• Framework: FastAPI
• Protocol: Server-Sent Events (SSE)
• Defined Tools:
  • upload_claim
  • get_claim_details

▶️ Running the MCP Server

cd server
pip install -r requirements.txt
python main.py

🚀 MCP Client

• Port: 5000
• Framework: FastAPI
• Endpoints:
  • POST /upload_claim → Calls upload_claim tool on the MCP Server
  • GET /get_claim_details → Calls get_claim_details tool on the MCP Server

▶️ Running the MCP Client

cd client
pip install -r requirements.txt
python main.py

🔄 Communication Flow

1. Client sends an SSE HTTP request to the MCP Server to invoke a tool.
2. Server processes the request and streams the response back via SSE.

📬 Sample Requests

POST /upload_claim

curl -X POST http://localhost:5000/upload_claim \
  -H "Content-Type: application/json" \
  -d '{
        "emp_id": "12345",
        "claim": "This is a dummy claim!"
      }'

POST /get_claim_details

curl -X POST http://localhost:5000/get_claim_details \
  -H "Content-Type: application/json" \
  -d '{
        "claim_id": "12345"
      }'

🧰 Requirements

Python 3.10+

requirements.txt`

"mcp[cli]"
fastapi
httpx

Install dependencies in each directory using:

pip install -r requirements.txt

⚠️ Notes

• This is a minimal prototype intended for development or educational use.
• Data is stored in-memory and will reset on server restart.
• SSE is used for simplicity and streaming compatibility.