MCP YNAB Server

An MCP server implementation that provides access to YNAB (You Need A Budget) functionality through the Model Context Protocol.

Features

View account balances and transactions
Create new transactions
Access YNAB data through standardized MCP resources

Related MCP server: ABAP-ADT-API MCP-Server

Installation

uv pip install -e .

Configuration

The server requires a YNAB API key to function. You can obtain one from your YNAB Developer Settings.

The API key can be provided through:

Environment variable: YNAB_API_KEY=your_api_key
MCP secret management system
.env file in project root

Usage

Running the Server

# Development mode with hot reload and browser launch task dev # Production install for Claude Desktop, Goose, or any other MCP-supported environment task install

Available Resources

ynab://accounts - List all YNAB accounts
ynab://transactions/{account_id} - Get recent transactions for a specific account

Available Tools

create_transaction - Create a new transaction
get_account_balance - Get the current balance of an account

Example Usage

# Create a new transaction result = await create_transaction( account_id="your_account_id", amount=42.50, # in dollars payee_name="Coffee Shop", category_name="Dining Out", memo="Morning coffee" ) # Get account balance balance = await get_account_balance("your_account_id") # List accounts accounts = await ctx.read_resource("ynab://accounts") # Get recent transactions transactions = await ctx.read_resource(f"ynab://transactions/{account_id}")

Development

# Install dependencies (uses uv) task deps # Run all tests including integration tests (you will need a YNAB API key for this) task test:all # Generate coverage report task coverage # Format and lint code task fmt # Should add this to Taskfile

Project Tasks

This project uses a Taskfile for common operations. Key commands:

task dev # Start dev server with auto-reload task test # Run unit tests task coverage # Generate test coverage report task install # Install production build task deps # Synchronize dependencies

See Taskfile.yml for all available tasks.