simple-tool-server-fastapi/
│
├── main.py              # FastAPI application and API endpoints
├── model.py             # Pydantic request models
├── tools.py             # Core utility functions
├── requirements.txt     # Project dependencies
├── .gitignore           # Files excluded from Git
└── README.md            # Project documentation

Client
   ↓
FastAPI Endpoint
   ↓
Python Tool Function
   ↓
JSON Response

GET /add
   ↓
add_numbers()
   ↓
JSON response

AI Assistant
     ↓
MCP Client
     ↓
MCP Server
     ↓
Python Tools

git clone https://github.com/sejalpatole/simple-tool-server-fastapi.git

cd simple-tool-server-fastapi

python -m venv venv

venv\Scripts\activate

source venv/bin/activate

pip install -r requirements.txt

uvicorn main:app --reload

http://127.0.0.1:8000

http://127.0.0.1:8000/docs

http://127.0.0.1:8000/redoc

GET /

{
  "message": "Welcome to the Simple Tool Server",
  "available_endpoints": [
    "/add",
    "/time",
    "/wordcount"
  ]
}

GET /add

http://127.0.0.1:8000/add?a=10&b=20

{
  "operation": "Addition",
  "a": 10,
  "b": 20,
  "result": 30
}

GET /time

http://127.0.0.1:8000/time

{
  "current_time": "2026-08-20 21:00:00"
}

POST /wordcount

{
  "text": "FastAPI is easy to use"
}

{
  "text": "FastAPI is easy to use",
  "word_count": 5
}

add_numbers()
get_current_time()
word_count()

class WordCountRequest(BaseModel):
    text: str

http://127.0.0.1:8000/docs