Square MCP server for AI agents

The Square MCP Server provides access to Square API functionality through a Model Context Protocol (MCP) implementation. This server allows you to interact with Square's payment and commerce features programmatically.

Installation

To set up the Square MCP Server, follow these steps:

Install dependencies using UV package manager:

uv sync

Configure the required environment variables:

# Required
export SQUARE_ACCESS_TOKEN=your_access_token_here

# Optional - defaults to 'sandbox' if not set
export SQUARE_ENVIRONMENT=sandbox  # or 'production' for production environment

Install and run the server:

uv pip install .
square-mcp

Environment Variables

The server requires configuration through environment variables:

Variable	Required	Default	Description
`SQUARE_ACCESS_TOKEN`	Yes	-	Your Square API access token
`SQUARE_ENVIRONMENT`	No	`sandbox`	Square API environment (`sandbox` or `production`)

Running in Development Mode

If you need to run the server in development mode:

source .venv/bin/activate
mcp dev src/square_mcp/server.py

Using the Latest Version

Please note that for the latest officially supported version, you should use the server from https://github.com/square/square-mcp-server.

How to add this MCP server to Cursor

There are two ways to add an MCP server to Cursor. The most common way is to add the server globally in the ~/.cursor/mcp.json file so that it is available in all of your projects.

If you only need the server in a single project, you can add it to the project instead by creating or adding it to the .cursor/mcp.json file.

Adding an MCP server to Cursor globally

To add a global MCP server go to Cursor Settings > MCP and click "Add new global MCP server".

When you click that button the ~/.cursor/mcp.json file will be opened and you can add your server like this:

{
    "mcpServers": {
        "cursor-rules-mcp": {
            "command": "npx",
            "args": [
                "-y",
                "cursor-rules-mcp"
            ]
        }
    }
}

Adding an MCP server to a project

To add an MCP server to a project you can create a new .cursor/mcp.json file or add it to the existing one. This will look exactly the same as the global MCP server example above.

How to use the MCP server

Once the server is installed, you might need to head back to Settings > MCP and click the refresh button.

The Cursor agent will then be able to see the available tools the added MCP server has available and will call them when it needs to.

You can also explictly ask the agent to use the tool by mentioning the tool name and describing what the function does.