Function multi_content 

pub fn multi_content(items: Vec<Value>) -> Value

Helper to create a multi-content response

Creates a response with multiple content items (text, images, resources):

{
  "content": [
    {"type": "text", "text": "..."},
    {"type": "image", "data": "...", "mimeType": "..."},
    {"type": "resource", "uri": "..."}
  ]
}

Example

fn handle_get_product(args: &Value) -> Result<Value, String> {
    Ok(multi_content(vec![
        serde_json::json!({"type": "text", "text": "Product info"}),
        serde_json::json!({
            "type": "image",
            "data": base64_image,
            "mimeType": "image/jpeg"
        })
    ]))
}