Appointment Scheduler MCP Server

A Model Context Protocol (MCP) server that connects to a PostgreSQL database to manage appointment scheduling. Built with FastMCP, SQLAlchemy, and Alembic for database migrations.

🚀 Features

• Database Integration: PostgreSQL database with SQLAlchemy ORM

• MCP Protocol: Supports both stdio and HTTP transport modes

• Database Migrations: Alembic for schema management and migrations

• Appointment Management: Schedule appointments with validation

• Docker Support: Containerized deployment with Docker Compose

• Environment Configuration: Secure credential management with .env files

📋 Prerequisites

• Python 3.13+

• PostgreSQL database

• uv package manager (recommended) or pip

🛠️ Installation

Using uv (Recommended)

# Clone the repository
git clone https://github.com/Juan-Andres-Motta/backend-mcp.git
cd backend-mcp

# Install dependencies
uv sync

Using pip

# Clone the repository
git clone https://github.com/Juan-Andres-Motta/backend-mcp.git
cd backend-mcp

# Create virtual environment
python -m venv .venv
source .venv/bin/activate  # On Windows: .venv\Scripts\activate

# Install dependencies
pip install -r requirements.txt

⚙️ Configuration

Environment Variables

Create a .env file in the project root:

# Database Configuration
DB_HOST=localhost
DB_PORT=5432
DB_NAME=your_database_name
DB_USER=your_username
DB_PASSWORD=your_password

# Database URL (constructed from above)
DATABASE_URL=postgresql://${DB_USER}:${DB_PASSWORD}@${DB_HOST}:${DB_PORT}/${DB_NAME}

# MCP Server Configuration
MCP_TRANSPORT=stdio  # Options: stdio, http
MCP_HOST=0.0.0.0    # Only used for HTTP transport
MCP_PORT=8000       # Only used for HTTP transport

Database Setup

1. Using Docker Compose (Recommended):

   docker-compose up -d postgres

2. Manual PostgreSQL Setup:

   • Install PostgreSQL

   • Create a database

   • Update .env with your database credentials

Database Migrations

Run database migrations to create the appointments table:

# Using uv
uv run alembic upgrade head

# Using pip
alembic upgrade head

🚀 Running the Server

Development Mode (stdio)

# Using uv
uv run python main.py

# Using pip
python main.py

HTTP Mode

Set MCP_TRANSPORT=http in your .env file:

# Using uv
uv run python main.py

# Using pip
python main.py

The server will be available at http://localhost:8000

Docker Deployment

# Build and run with Docker Compose
docker-compose up --build

# Run only the MCP server (requires external PostgreSQL)
docker build -t appointment-mcp .
docker run --env-file .env appointment-mcp

📖 API Usage

MCP Tool: schedule_appointment

Schedules a new appointment in the database.

Parameters:

• name (string): Full name of the person scheduling the appointment

• identification_number (string): Identification number (ID card, passport, etc.)

• phone (string): Phone number

• date (string): Appointment date and time in ISO format (YYYY-MM-DDTHH:MM:SS)

Example:

{
  "name": "John Doe",
  "identification_number": "123456789",
  "phone": "+1234567890",
  "date": "2024-12-25T14:30:00"
}

Response:

{
  "result": "Success: Appointment scheduled for John Doe on 2024-12-25 14:30:00 (ID: 1)"
}

🏗️ Project Structure

backend-mcp/
├── main.py                 # Main MCP server application
├── pyproject.toml          # Project dependencies and configuration
├── uv.lock                 # uv lock file
├── alembic/                # Database migration files
│   ├── env.py
│   ├── script.py.mako
│   └── versions/
├── .env                    # Environment variables (create this)
├── .env.example           # Environment variables template
├── Dockerfile             # Docker container configuration
├── docker-compose.yml     # Docker Compose configuration
├── .dockerignore          # Docker ignore file
├── .gitignore             # Git ignore file
└── README.md              # This file

🔧 Development

Running Tests

# Install development dependencies
uv sync --dev

# Run tests
uv run pytest

Database Schema

The appointments table structure:

CREATE TABLE appointments (
    id SERIAL PRIMARY KEY,
    name VARCHAR(255) NOT NULL,
    identification_number VARCHAR(50) NOT NULL,
    phone VARCHAR(20) NOT NULL,
    date TIMESTAMP NOT NULL
);

Adding New Features

1. Define new MCP tools in main.py

2. Update database models if needed

3. Create Alembic migrations for schema changes

4. Update this README

🤝 Contributing

1. Fork the repository

2. Create a feature branch

3. Make your changes

4. Add tests if applicable

5. Submit a pull request

📄 License

This project is licensed under the MIT License - see the LICENSE file for details.

🆘 Troubleshooting

Common Issues

1. Database Connection Error

   • Check your .env file configuration

   • Ensure PostgreSQL is running

   • Verify database credentials

2. Migration Errors

   • Run alembic current to check migration status

   • Run alembic upgrade head to apply pending migrations

3. MCP Transport Issues

   • For stdio mode: Ensure the MCP client supports stdio transport

   • For HTTP mode: Check that the port is not in use

Getting Help

• Check the FastMCP documentation

• Review SQLAlchemy documentation

• Check Alembic documentation

📊 Version History

• v1.0.0: Initial release with basic appointment scheduling functionality

• Database integration with PostgreSQL

• Docker containerization

• MCP protocol support (stdio and HTTP)