How To Get Environment Variables

[ilvalerione]

Hi, thank you for the great package,
I would understand how to get environment variables passed by an MCP client using Stdio transport. How the server makes them available in the elements class or methods declared as tools?

Do you have a code example on how to access env variables?

This should be a valid client configuration:

{
    "mcpServers": {
        "php-calculator": {
            "command": "php",
            "args": ["/absolute/path/to/your/mcp-server.php"], 
            "env": {"API_KEY": "xxxx"}
        }
    }
}

[ilvalerione]

I tried this code supposing the environment variable could be available in the global $_ENV array, but it does not work:

class WebServiceElements
{
    #[McpTool(name: 'get_api_key', description: 'Get the API key')]
    public function apiKey(): string
    {
        return $_ENV['API_KEY'];
    }
}

[ilvalerione]

At least, is there a way to pass arguments on client configuration?

Arguments can also be chained in the command structure like below:

{
    "mcpServers": {
        "php-calculator": {
            "command": "php",
            "args": [
                "/absolute/path/to/your/mcp-server.php",
               "API_KEY_HERE"
            ], 
        }
    }
}

But the question still the same: How to get these values on the server side inside tool functions?

[ilvalerione]

getenv('ENV_VAR') works