mcp server fails to load

[1of13]

After adding the following to config, the server fails to load. I have no trouble loading any other mcp servers. Is there another step that I'm missing?

{
"mcpServers": {
"mcp-pandoc": {
"command": "uvx",
"args": ["mcp-pandoc"]
}
}
}

[adityak74]

@1of13 make sure the mcpServers is only the root key. Also for reference can you post the complete config that you have in your claude_desktop_config.json.

{
  "mcpServers": {
    {...other_servers}
    "mcp-pandoc": {
      "command": "uvx",
      "args": ["mcp-pandoc"]
    }
  }
}

[1of13]

like i stated earlier, i have no problems with the other mcp servers installed, this is the only one that does not work out of 15--so, it is not the config file.

[andyvntsys]

like i stated earlier, i have no problems with the other mcp servers installed, this is the only one that does not work out of 15--so, it is not the config file.

same here

[vivekVells]

Looking into this now. @andyvntsys @1of13

[vivekVells]

I couldn't replicate the issue. Let me revert the recent changes for now.

[vivekVells]

I've reverted the docx and pdf support changes. After further testing in an isolated environment (to rule out local dependencies like weasyprint), I'll reimplement this feature.

Thank you @andyvntsys @1of13 for reporting the issue - I've been unable to replicate it on my machine, possibly due to my local weasyprint installation. You should be good now. Let us know if you still face any issues.

I will keep this thread updated on the progress.

[vivekVells]

Finally, got some time today to look into this. And, with some exciting news.

We have recently merged a feature that supports converting other file formats as well. Right now, mcp-pandoc supports 'html', 'markdown', 'pdf', 'docx', 'rst', 'latex', 'epub', 'txt'. -> https://github.com/vivekVells/mcp-pandoc?tab=readme-ov-file#supported-formats

@andyvntsys @1of13 I have verified it locally in my machine & it works as expected. Please let me know if you are good.

Verified

Screenshots

[vivekVells]

For PDF, ensure to install textlive package. Refer https://github.com/vivekVells/mcp-pandoc?tab=readme-ov-file#%EF%B8%8F-important-notes

[vivekVells]

I will keep this issue open for a while & close if no further issues reported.

[BindingOx]

What worked for me on windows:

There are two main approaches we can try:

1. Quick Fix (Temporary):
   Before running your script, open Command Prompt and run:

setx PYTHONIOENCODING "utf-8"

AND/OR

2. Permanent System-Wide Fix (recommended):
3. Press Windows + I to open Settings
4. Go to "Time & Language"
5. Click "Language & Region" on the left sidebar
6. Click "Administrative language settings" on the right
7. Click "Change system locale" button
8. Check the box that says "Use Unicode UTF-8 for worldwide language support"
9. Click OK and restart your computer

[Lindharin]

I'm trying to load the mcp_pandoc server in the Windows client for Claude and it is failing. Other mcp servers are loading correctly, so I'm doing something wrong here. I've tried it two ways:

1. Using the manual published option. My config file is:

{
  "mcpServers": {
    "filesystem": {
      "command": "npx",
      "args": [
        "-y",
        "@modelcontextprotocol/server-filesystem",
        "C:\\Users\\jim\\Desktop",
        "C:\\Users\\jim\\Downloads"
      ]
    },

    "fetch": {
      "command": "python",
      "args": [
        "-m",
        "mcp_server_fetch"
      ],
      "env": {
        "DEBUG": "*"
      }
    },

    "obsidian-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "obsidian-mcp",
        "C:\\ObsidianVault\\Scratchpad"
      ]
    },

    "mcp-pandoc": {
      "command": "uvx",
      "args": ["mcp-pandoc"]
    }
  }
}

and the error I get in mcp-server-mcp-pandoc.log is:
Traceback (most recent call last): File "<frozen runpy>", line 198, in _run_module_as_main File "<frozen runpy>", line 88, in _run_code File "C:\Python313\Scripts\uvx.exe\__main__.py", line 4, in <module> from uvx.cli import app File "C:\Python313\Lib\site-packages\uvx\cli.py", line 24, in <module> from ._python import _get_package_version, _pip, _python_in_venv, _uv File "C:\Python313\Lib\site-packages\uvx\_python.py", line 7, in <module> from plumbum.cmd import grep # type: ignore ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ImportError: cannot import name 'grep' from 'plumbum.cmd' (C:\Python313\Lib\site-packages\plumbum\cmd.py)
2. Next I tried using the Smithery option. I ran:
npx -y @smithery/cli install mcp-pandoc --client claude
It says it successfuly installed, and updated the config file to have:
"mcp-pandoc": { "command": "npx", "args": [ "-y", "@smithery/cli", "run", "mcp-pandoc", "--config", "\"{}\"" ] }
Now the mcp-server-mcp-pandoc.log is:
'C:\Program' is not recognized as an internal or external command, operable program or batch file.
I'm not sure if my error is related to this open issue or not. Is there anything I should try next?
Thanks!

[connor4312]

The tools schema uses oneOf at the top level, which neither Claude models nor 4o support. That may be part of the reason folks are having trouble.

[vivekVells]

Interesting. Thanks for suggestion @connor4312 . I have to spend some time and will look into this sometime soon. In the meantime, if you're able and interested in contributing a fix, please feel free! 🙌

[vivekVells]

woah! this is a super old issue. and, I lost track of this. apologies.