envmcp

Use environment variables in your Cursor MCP server definitions.

💡 Looking for more features? Consider mcpipe (npm) which includes envmcp’s functionality as well as debugging tools and other capabilities.

Quick Start

# Use default ~/.env.mcp file
npx envmcp your-mcp-server $DATABASE_URL

# Specify custom env file
npx envmcp --env-file .env your-mcp-server $API_KEY $DATABASE_URL

# Short flag version
npx envmcp -e /path/to/secrets.env your-mcp-server $MY_SECRET

Usage in MCP Clients

Prefix your server command with envmcp.

Before (secrets exposed in config):

{
  "my_database": {
    "command": "my-mcp-server",
    "args": ["postgresql://user:password@hostname/db"]
  }
}

After (secrets in ~/.env.mcp):

{
  "my_database": {
    "command": "npx",
    "args": ["envmcp", "my-mcp-server", "$DATABASE_URL"]
  }
}

How It Works

1. Looks for .env.mcp in current directory, then parent directories, finally ~/.env.mcp
2. If --env-file is specified, uses that file instead
3. Loads environment variables from the file
4. Replaces $VARIABLE_NAME references in your command arguments
5. Executes the command with substituted values

Installation

npm install -g envmcp

Options

• --env-file , -e : Specify custom environment file path

Environment File Format

DATABASE_URL=postgresql://user:password@localhost/db
API_KEY=your-secret-api-key
# This is a comment
QUOTED_VALUE="value with spaces"

See sample.env.mcp for more examples.

License

MIT