MCP client image rendering

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1

Hi!

I have a simple mcp tool in python (see MWE below) in which I try to get the image (similar to the one shown here.

The mcp client receives a dictionary style response and doesn’t render the image. On the other hand, if i call image-server.js, I do see the image rendered in the chat window

I was wondering if anyone can help on what i may be doing wrong here? Thank you in advance.

PS: I have tried to return a simple dictionary as well as to_image_content() as mentioned here, but i wasn’t successful.

from typing import Dict
from fastmcp import FastMCP 
from fastmcp.utilities.types import Image

mcp = FastMCP("Simple Server")


@mcp.tool()
def get_image(random_number: int) -> Dict:
    RED_CIRCLE_BASE64 = "/9j/4AAQSkZJRgABAgEASABIAAD/..."
    result = Image(data=bytes(RED_CIRCLE_BASE64, "utf-8"), format="jpeg").to_image_content()
    return {
        "content": [
            result
        ]
    }

if __name__ == "__main__":
    mcp.run()