dynamic resource not working in Claude desktop

[Nriver]

Describe the bug A clear and concise description of what the bug is.

To Reproduce use the demo server in quick start document

# server.py
from mcp.server.fastmcp import FastMCP

# Create an MCP server
mcp = FastMCP("Demo")

@mcp.resource("config://app")
def get_config() -> str:
    """Static configuration data"""
    return "App configuration here"

# dynamic resource
@mcp.resource("greeting://{name}")
def get_greeting(name: str) -> str:
    """Get a personalized greeting"""
    return f"Hello, {name}!"

Claude can not see the dynamic resource, only the static one works.

Expected behavior Use dynamic resource in Claude

Screenshots

Desktop (please complete the following information):

• OS: windows 10

[dsp-ant]

Yes, sadly Claude Desktop does currently not support dyanmic resources.

[Nriver]

Do you know which application can work with dynamic resources? I want to test it with my mcp server.

[btcsing]

Not work in MacOS, too, I try bunch of time.....

[serranoarevalo]

Maybe a note should be added in the "Notes" of the "Feature support matrix" for Claude Desktop, spent a bunch of time wondering what was wrong.

[WSJUSA]

Claude calls resources/list which is for static resources. But dynamic resources are called at resources/templates/list -- which it seems based on logs Claude does not call on.

This can be seen in the MCP Inspector > Resources tab at top

[raolak]

Can we prioritise this please.. need to experiment few things with resources.. currently blocked on this

[shlomi-schwartz]

I've spent more than a day trying to make it work. This is a major disappointment.

[jingcheng-chen]

I thought I did something wrong..

[spin]

+1, spent a bunch of time testing my MCP, only to discover it is not yet supported ...

[HoaX7]

+1. It isnt showing up in the inspector either

[qlmmlp]

I successfully made it work in the inspector, but unfortunately couldn't get it working in Claude Desktop. The same approach doesn't seem to function properly in the desktop app.

[raolak]

You might have got it working for static resources .. not dynamic resources .. without resources mcp tooling feels incomplete . Please do let me know if it’s working for you. I will give it a try .

On Sat, 19 Apr 2025 at 7:34 PM, Anton Sakharov @.***> wrote:

I successfully made it work in the inspector, but unfortunately couldn't get it working in Claude Desktop. The same approach doesn't seem to function properly in the desktop app.

— Reply to this email directly, view it on GitHub https://github.com/modelcontextprotocol/python-sdk/issues/263#issuecomment-2816720861, or unsubscribe https://github.com/notifications/unsubscribe-auth/AAGPZOJMOJP462PSO2547PD22JJYNAVCNFSM6AAAAABY2PLXM2VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDQMJWG4ZDAOBWGE . You are receiving this because you commented.Message ID: @.***> qlmmlp left a comment (modelcontextprotocol/python-sdk#263) https://github.com/modelcontextprotocol/python-sdk/issues/263#issuecomment-2816720861

I successfully made it work in the inspector, but unfortunately couldn't get it working in Claude Desktop. The same approach doesn't seem to function properly in the desktop app.

— Reply to this email directly, view it on GitHub https://github.com/modelcontextprotocol/python-sdk/issues/263#issuecomment-2816720861, or unsubscribe https://github.com/notifications/unsubscribe-auth/AAGPZOJMOJP462PSO2547PD22JJYNAVCNFSM6AAAAABY2PLXM2VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDQMJWG4ZDAOBWGE . You are receiving this because you commented.Message ID: @.***>

[HRS0986]

I am also having the same issue. Can you guys make it quick ?

[yonidavidson]

Me too, also the inspector doesn't support adding template params

[ruilacerda]

in puppeteer the snapshot is exposed to claude desktop as an image resource (correct?) ... so somehow they are doing it correctly there ?

[2noScript]

it doesn't work, tried many times

[ruilacerda]

yeah, meatime I read more on it and looks like resources aren't support in claude desktop in windows at least (although in the Feature support matrix it suposedly suports). But I found one of the thing I was looking into, the correct way to deliver image to the mcp client (I am sure it is also how they are doing in puppeteer) below in python for example a take_screenshot, adapted from example in github examples

@mcp.tool()
def read_screen():
    """
    Take a screenshot of the user's screen and return it as an image. Use
    this tool anytime the user wants you to look at something they're doing.
    """
    
    logger.info("Taking screenshot")
    
    try:
        
        buffer = io.BytesIO()
        
        # if the file exceeds ~1MB, it will be rejected by Claude
        screenshot = pyautogui.screenshot()
        screenshot.convert("RGB").save(buffer, format="JPEG", quality=60, optimize=True)
        buffer.seek(0)
        
        logger.info("Screenshot captured successfully")
        return Image(data=buffer.getvalue(), format="jpeg")
    
    except Exception as e:
        logger.error(f"Error taking screenshot: {str(e)}")
        raise Exception(f"Failed to take screenshot: {str(e)}")

[ofekfell]

yeah, meatime I read more on it and looks like resources aren't support in claude desktop in windows at least (although in the Feature support matrix it suposedly suports). But I found one of the thing I was looking into, the correct way to deliver image to the mcp client (I am sure it is also how they are doing in puppeteer) below in python for example a take_screenshot, adapted from example in github examples

@mcp.tool()
def read_screen():
    """
    Take a screenshot of the user's screen and return it as an image. Use
    this tool anytime the user wants you to look at something they're doing.
    """
    
    logger.info("Taking screenshot")
    
    try:
        
        buffer = io.BytesIO()
        
        # if the file exceeds ~1MB, it will be rejected by Claude
        screenshot = pyautogui.screenshot()
        screenshot.convert("RGB").save(buffer, format="JPEG", quality=60, optimize=True)
        buffer.seek(0)
        
        logger.info("Screenshot captured successfully")
        return Image(data=buffer.getvalue(), format="jpeg")
    
    except Exception as e:
        logger.error(f"Error taking screenshot: {str(e)}")
        raise Exception(f"Failed to take screenshot: {str(e)}")

@ruilacerda what is exactly the type/package of Image that your are using? tried to use ktinker/PIL but seems like Claude coulndt handle the object

[terrynguyen255]

Hi everyone,

If you can get Claude Desktop to work with static resources, could you please help me with this issue of MCP resources Any help would be appreciated.

Thank you so much

[shouhengyi]

Ping on this. Can we prioritize this? Without dynamic MCP resources, claude code is less useful.

[richardkmichael]

This is not a Python SDK issue. Unfortunately, there is no Claude Desktop repo for requests such as these. Any chance that's coming @felixrieseberg ?

Also: resources in Claude Desktop

• https://github.com/modelcontextprotocol/python-sdk/issues/92
• https://github.com/modelcontextprotocol/python-sdk/issues/1016

(The Claude Code repo has issues related to Resources, list-changed notifications, and Resource Templates.)

[pkillick-airiq]

Do you know which application can work with dynamic resources? I want to test it with my mcp server.

GitHub CoPilot in VS Code supports resource templates. Still not in Claude Desktop - just tried it.