Pandoc MCP server Timeout

[inv-suryaraj]

What happened?

I'm experiencing an issue with the Pandoc MCP server when integrated with LibreChat, resulting in an "mcp_timeout" error message. However, when I use Pandoc via terminal commands, it functions correctly, leading me to believe the issue is specific to the LibreChat integration. Could you kindly explain the potential cause of this problem and suggest possible solutions? Thank you!

pandoc 3.1.3
Features: -server +lua
Scripting engine: Lua 5.4

The resulted errors are as follows:

1. Error processing tool: "convert-contents_mcp_pandoc" tool call failed: Not connected
2. Error processing tool: "convert-contents_mcp_pandoc" tool call failed: MCP error -32001: Request timed out

Version Information

6e663b2

Steps to Reproduce

1. Integrate pandoc with LibreChat
2. Trty to create an HTML file and convert it to PPTX
3. Error

What browsers are you seeing the problem on?

Chrome

Relevant log output

2025-05-20 14:08:55 info: Server listening at http://localhost:3080
401 error, refreshing token
2025-05-20 14:09:02 error: Failed to fetch models from Mistral API An error occurred while setting up the request: Invalid URL
401 error, refreshing token
2025-05-20 14:09:03 error: Failed to fetch models from Portkey API An error occurred while setting up the request: Invalid URL
[05/20/25 14:09:03] INFO     Processing request of type ListToolsRequest                                                                                                         server.py:534
2025-05-20 14:09:34 error: [addObjectToMeili] Error adding document to Meili fetch failed
2025-05-20 14:09:34 error: [addObjectToMeili] Error adding document to Meili fetch failed
field[contentBlockIndex] already exists in this message chunk and value has unsupported type.
field[contentBlockIndex] already exists in this message chunk and value has unsupported type.
2025-05-20 14:09:46 error: [addObjectToMeili] Error adding document to Meili fetch failed
2025-05-20 14:09:46 error: [addObjectToMeili] Error adding document to Meili fetch failed
2025-05-20 14:09:46 error: [addObjectToMeili] Error adding document to Meili fetch failed
2025-05-20 14:09:46 error: [addObjectToMeili] Error adding document to Meili fetch failed
2025-05-20 14:09:50 error: [addObjectToMeili] Error adding document to Meili fetch failed
2025-05-20 14:10:04 info: [api/server/controllers/agents/client.js #checkVisionRequest] not implemented
2025-05-20 14:10:04 error: [addObjectToMeili] Error adding document to Meili fetch failed
2025-05-20 14:10:04 error: [addObjectToMeili] Error adding document to Meili fetch failed
field[contentBlockIndex] already exists in this message chunk and value has unsupported type.
field[contentBlockIndex] already exists in this message chunk and value has unsupported type.
field[contentBlockIndex] already exists in this message chunk and value has unsupported type.
field[contentBlockIndex] already exists in this message chunk and value has unsupported type.
2025-05-20 14:10:23 info: [MCP][User: 682b0a1bbbd39fb4ac70a0b8][pandoc] Establishing new connection
DEBUG uv 0.7.3
DEBUG Found project root: `/home/suryarajps/Desktop/librechat/LibreChat/packages/mcp/servers/mcp-pandoc`
DEBUG No workspace root found, using project root
DEBUG Discovered project `mcp-pandoc` at: /home/suryarajps/Desktop/librechat/LibreChat/packages/mcp/servers/mcp-pandoc
DEBUG Acquired lock for `/home/suryarajps/Desktop/librechat/LibreChat/packages/mcp/servers/mcp-pandoc`
DEBUG Reading Python requests from version file at `/home/suryarajps/Desktop/librechat/LibreChat/packages/mcp/servers/mcp-pandoc/.python-version`
DEBUG Using Python request `3.13` from version file at `.python-version`
DEBUG Checking for Python environment at `.venv`
DEBUG The project environment's Python version satisfies the request: `Python 3.13`
DEBUG Released lock at `/tmp/uv-34812a5151a659fb.lock`
DEBUG Using request timeout of 30s
DEBUG Found static `pyproject.toml` for: mcp-pandoc @ file:///home/suryarajps/Desktop/librechat/LibreChat/packages/mcp/servers/mcp-pandoc
DEBUG No workspace root found, using project root
DEBUG Existing `uv.lock` satisfies workspace requirements
Resolved 34 packages in 1ms
DEBUG Using request timeout of 30s
DEBUG Computed cache info: Some(Timestamp(SystemTime { tv_sec: 1747658913, tv_nsec: 926373438 })), None, None, {}, {"src": Some(Timestamp(Timestamp(SystemTime { tv_sec: 1747202721, tv_nsec: 208467719 })))}
DEBUG Requirement already installed: mcp-pandoc==0.3.3 (from file:///home/suryarajps/Desktop/librechat/LibreChat/packages/mcp/servers/mcp-pandoc)
DEBUG Requirement already installed: beautifulsoup4==4.13.4
DEBUG Requirement already installed: mcp==1.8.1
DEBUG Requirement already installed: pandoc==2.4
DEBUG Requirement already installed: pypandoc==1.15
DEBUG Requirement already installed: python-pptx==1.0.2
DEBUG Requirement already installed: soupsieve==2.7
DEBUG Requirement already installed: typing-extensions==4.13.2
DEBUG Requirement already installed: anyio==4.9.0
DEBUG Requirement already installed: httpx==0.28.1
DEBUG Requirement already installed: httpx-sse==0.4.0
DEBUG Requirement already installed: pydantic==2.11.4
DEBUG Requirement already installed: pydantic-settings==2.9.1
DEBUG Requirement already installed: python-multipart==0.0.20
DEBUG Requirement already installed: sse-starlette==2.3.5
DEBUG Requirement already installed: starlette==0.46.2
DEBUG Requirement already installed: uvicorn==0.34.2
DEBUG Requirement already installed: plumbum==1.9.0
DEBUG Requirement already installed: ply==3.11
DEBUG Requirement already installed: lxml==5.4.0
DEBUG Requirement already installed: pillow==11.2.1
DEBUG Requirement already installed: xlsxwriter==3.2.3
DEBUG Requirement already installed: idna==3.10
DEBUG Requirement already installed: sniffio==1.3.1
DEBUG Requirement already installed: certifi==2025.4.26
DEBUG Requirement already installed: httpcore==1.0.9
DEBUG Requirement already installed: annotated-types==0.7.0
DEBUG Requirement already installed: pydantic-core==2.33.2
DEBUG Requirement already installed: typing-inspection==0.4.0
DEBUG Requirement already installed: python-dotenv==1.1.0
DEBUG Requirement already installed: click==8.2.0
DEBUG Requirement already installed: h11==0.16.0
Audited 32 packages in 0.32ms
DEBUG Using Python 3.13.3 interpreter at: /home/suryarajps/Desktop/librechat/LibreChat/packages/mcp/servers/mcp-pandoc/.venv/bin/python3
DEBUG Running `mcp-pandoc`
DEBUG Spawned child 36227 in process group 35874
2025-05-20 14:10:23 info: [MCP][User: 682b0a1bbbd39fb4ac70a0b8][pandoc] Connection successfully established
2025-05-20 14:11:23 error: [MCP][User: 682b0a1bbbd39fb4ac70a0b8][pandoc][convert-contents] Tool call failed MCP error -32001: Request timed out
2025-05-20 14:11:23 error: [MCP][User: 682b0a1bbbd39fb4ac70a0b8][pandoc] Error calling "convert-contents" MCP tool: MCP error -32001: Request timed out
2025-05-20 14:11:23 error: [api/server/controllers/agents/client.js #chatCompletion] Tool Error "convert-contents_mcp_pandoc" tool call failed: MCP error -32001: Request timed out
  + Exception Group Traceback (most recent call last):
  |   File "/home/suryarajps/Desktop/librechat/LibreChat/packages/mcp/servers/mcp-pandoc/.venv/bin/mcp-pandoc", line 10, in <module>
  |     sys.exit(main())
  |              ~~~~^^
  |   File "/home/suryarajps/Desktop/librechat/LibreChat/packages/mcp/servers/mcp-pandoc/src/mcp_pandoc/__init__.py", line 6, in main
  |     asyncio.run(server.main())
  |     ~~~~~~~~~~~^^^^^^^^^^^^^^^
  |   File "/home/suryarajps/.local/share/uv/python/cpython-3.13.3-linux-x86_64-gnu/lib/python3.13/asyncio/runners.py", line 195, in run
  |     return runner.run(main)
  |            ~~~~~~~~~~^^^^^^
  |   File "/home/suryarajps/.local/share/uv/python/cpython-3.13.3-linux-x86_64-gnu/lib/python3.13/asyncio/runners.py", line 118, in run
  |     return self._loop.run_until_complete(task)
  |            ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^
  |   File "/home/suryarajps/.local/share/uv/python/cpython-3.13.3-linux-x86_64-gnu/lib/python3.13/asyncio/base_events.py", line 719, in run_until_complete
  |     return future.result()
  |            ~~~~~~~~~~~~~^^
  |   File "/home/suryarajps/Desktop/librechat/LibreChat/packages/mcp/servers/mcp-pandoc/src/mcp_pandoc/server.py", line 264, in main
  |     async with mcp.server.stdio.stdio_server() as (read_stream, write_stream):
  |                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
  |   File "/home/suryarajps/.local/share/uv/python/cpython-3.13.3-linux-x86_64-gnu/lib/python3.13/contextlib.py", line 235, in __aexit__
  |     await self.gen.athrow(value)
  |   File "/home/suryarajps/Desktop/librechat/LibreChat/packages/mcp/servers/mcp-pandoc/.venv/lib/python3.13/site-packages/mcp/server/stdio.py", line 87, in stdio_server
  |     async with anyio.create_task_group() as tg:
  |                ~~~~~~~~~~~~~~~~~~~~~~~^^
  |   File "/home/suryarajps/Desktop/librechat/LibreChat/packages/mcp/servers/mcp-pandoc/.venv/lib/python3.13/site-packages/anyio/_backends/_asyncio.py", line 772, in __aexit__
  |     raise BaseExceptionGroup(
  |         "unhandled errors in a TaskGroup", self._exceptions
  |     ) from None
  | ExceptionGroup: unhandled errors in a TaskGroup (1 sub-exception)
  +-+---------------- 1 ----------------
    | Exception Group Traceback (most recent call last):
    |   File "/home/suryarajps/Desktop/librechat/LibreChat/packages/mcp/servers/mcp-pandoc/.venv/lib/python3.13/site-packages/mcp/server/stdio.py", line 90, in stdio_server
    |     yield read_stream, write_stream
    |   File "/home/suryarajps/Desktop/librechat/LibreChat/packages/mcp/servers/mcp-pandoc/src/mcp_pandoc/server.py", line 265, in main
    |     await server.run(
    |     ...<10 lines>...
    |     )
    |   File "/home/suryarajps/Desktop/librechat/LibreChat/packages/mcp/servers/mcp-pandoc/.venv/lib/python3.13/site-packages/mcp/server/lowlevel/server.py", line 489, in run
    |     async with AsyncExitStack() as stack:
    |                ~~~~~~~~~~~~~~^^
    |   File "/home/suryarajps/.local/share/uv/python/cpython-3.13.3-linux-x86_64-gnu/lib/python3.13/contextlib.py", line 768, in __aexit__
    |     raise exc
    |   File "/home/suryarajps/.local/share/uv/python/cpython-3.13.3-linux-x86_64-gnu/lib/python3.13/contextlib.py", line 751, in __aexit__
    |     cb_suppress = await cb(*exc_details)
    |                   ^^^^^^^^^^^^^^^^^^^^^^
    |   File "/home/suryarajps/Desktop/librechat/LibreChat/packages/mcp/servers/mcp-pandoc/.venv/lib/python3.13/site-packages/mcp/shared/session.py", line 209, in __aexit__
    |     return await self._task_group.__aexit__(exc_type, exc_val, exc_tb)
    |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |   File "/home/suryarajps/Desktop/librechat/LibreChat/packages/mcp/servers/mcp-pandoc/.venv/lib/python3.13/site-packages/anyio/_backends/_asyncio.py", line 772, in __aexit__
    |     raise BaseExceptionGroup(
    |         "unhandled errors in a TaskGroup", self._exceptions
    |     ) from None
    | ExceptionGroup: unhandled errors in a TaskGroup (1 sub-exception)
    +-+---------------- 1 ----------------
      | Traceback (most recent call last):
      |   File "/home/suryarajps/Desktop/librechat/LibreChat/packages/mcp/servers/mcp-pandoc/.venv/lib/python3.13/site-packages/mcp/server/session.py", line 146, in _receive_loop
      |     await super()._receive_loop()
      |   File "/home/suryarajps/Desktop/librechat/LibreChat/packages/mcp/servers/mcp-pandoc/.venv/lib/python3.13/site-packages/mcp/shared/session.py", line 331, in _receive_loop
      |     validated_request = self._receive_request_type.model_validate(
      |         message.message.root.model_dump(
      |             by_alias=True, mode="json", exclude_none=True
      |         )
      |     )
      |   File "/home/suryarajps/Desktop/librechat/LibreChat/packages/mcp/servers/mcp-pandoc/.venv/lib/python3.13/site-packages/pydantic/main.py", line 703, in model_validate
      |     return cls.__pydantic_validator__.validate_python(
      |            ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
      |         obj, strict=strict, from_attributes=from_attributes, context=context, by_alias=by_alias, by_name=by_name
      |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      |     )
      |     ^
      | pydantic_core._pydantic_core.ValidationError: 23 validation errors for ClientRequest
      | PingRequest.method
      |   Input should be 'ping' [type=literal_error, input_value='tools/call', input_type=str]
      |     For further information visit https://errors.pydantic.dev/2.11/v/literal_error
      | InitializeRequest.method
      |   Input should be 'initialize' [type=literal_error, input_value='tools/call', input_type=str]
      |     For further information visit https://errors.pydantic.dev/2.11/v/literal_error
      | InitializeRequest.params.protocolVersion
      |   Field required [type=missing, input_value={'name': 'convert-content...div>\n</body>\n</html>'}, input_type=dict]
      |     For further information visit https://errors.pydantic.dev/2.11/v/missing
      | InitializeRequest.params.capabilities
      |   Field required [type=missing, input_value={'name': 'convert-content...div>\n</body>\n</html>'}, input_type=dict]
      |     For further information visit https://errors.pydantic.dev/2.11/v/missing
      | InitializeRequest.params.clientInfo
      |   Field required [type=missing, input_value={'name': 'convert-content...div>\n</body>\n</html>'}, input_type=dict]
      |     For further information visit https://errors.pydantic.dev/2.11/v/missing
      | CompleteRequest.method
      |   Input should be 'completion/complete' [type=literal_error, input_value='tools/call', input_type=str]
      |     For further information visit https://errors.pydantic.dev/2.11/v/literal_error
      | CompleteRequest.params.ref
      |   Field required [type=missing, input_value={'name': 'convert-content...div>\n</body>\n</html>'}, input_type=dict]
      |     For further information visit https://errors.pydantic.dev/2.11/v/missing
      | CompleteRequest.params.argument
      |   Field required [type=missing, input_value={'name': 'convert-content...div>\n</body>\n</html>'}, input_type=dict]
      |     For further information visit https://errors.pydantic.dev/2.11/v/missing
      | SetLevelRequest.method
      |   Input should be 'logging/setLevel' [type=literal_error, input_value='tools/call', input_type=str]
      |     For further information visit https://errors.pydantic.dev/2.11/v/literal_error
      | SetLevelRequest.params.level
      |   Field required [type=missing, input_value={'name': 'convert-content...div>\n</body>\n</html>'}, input_type=dict]
      |     For further information visit https://errors.pydantic.dev/2.11/v/missing
      | GetPromptRequest.method
      |   Input should be 'prompts/get' [type=literal_error, input_value='tools/call', input_type=str]
      |     For further information visit https://errors.pydantic.dev/2.11/v/literal_error
      | GetPromptRequest.params.arguments
      |   Input should be a valid dictionary [type=dict_type, input_value='<!DOCTYPE html>\n<html>\.../div>\n</body>\n</html>', input_type=str]
      |     For further information visit https://errors.pydantic.dev/2.11/v/dict_type
      | ListPromptsRequest.method
      |   Input should be 'prompts/list' [type=literal_error, input_value='tools/call', input_type=str]
      |     For further information visit https://errors.pydantic.dev/2.11/v/literal_error
      | ListResourcesRequest.method
      |   Input should be 'resources/list' [type=literal_error, input_value='tools/call', input_type=str]
      |     For further information visit https://errors.pydantic.dev/2.11/v/literal_error
      | ListResourceTemplatesRequest.method
      |   Input should be 'resources/templates/list' [type=literal_error, input_value='tools/call', input_type=str]
      |     For further information visit https://errors.pydantic.dev/2.11/v/literal_error
      | ReadResourceRequest.method
      |   Input should be 'resources/read' [type=literal_error, input_value='tools/call', input_type=str]
      |     For further information visit https://errors.pydantic.dev/2.11/v/literal_error
      | ReadResourceRequest.params.uri
      |   Field required [type=missing, input_value={'name': 'convert-content...div>\n</body>\n</html>'}, input_type=dict]
      |     For further information visit https://errors.pydantic.dev/2.11/v/missing
      | SubscribeRequest.method
      |   Input should be 'resources/subscribe' [type=literal_error, input_value='tools/call', input_type=str]
      |     For further information visit https://errors.pydantic.dev/2.11/v/literal_error
      | SubscribeRequest.params.uri
      |   Field required [type=missing, input_value={'name': 'convert-content...div>\n</body>\n</html>'}, input_type=dict]
      |     For further information visit https://errors.pydantic.dev/2.11/v/missing
      | UnsubscribeRequest.method
      |   Input should be 'resources/unsubscribe' [type=literal_error, input_value='tools/call', input_type=str]
      |     For further information visit https://errors.pydantic.dev/2.11/v/literal_error
      | UnsubscribeRequest.params.uri
      |   Field required [type=missing, input_value={'name': 'convert-content...div>\n</body>\n</html>'}, input_type=dict]
      |     For further information visit https://errors.pydantic.dev/2.11/v/missing
      | CallToolRequest.params.arguments
      |   Input should be a valid dictionary [type=dict_type, input_value='<!DOCTYPE html>\n<html>\.../div>\n</body>\n</html>', input_type=str]
      |     For further information visit https://errors.pydantic.dev/2.11/v/dict_type
      | ListToolsRequest.method
      |   Input should be 'tools/list' [type=literal_error, input_value='tools/call', input_type=str]
      |     For further information visit https://errors.pydantic.dev/2.11/v/literal_error
      +------------------------------------
DEBUG Command exited with code: 1
field[contentBlockIndex] already exists in this message chunk and value has unsupported type.
field[contentBlockIndex] already exists in this message chunk and value has unsupported type.
2025-05-20 14:11:29 error: [MCP][User: 682b0a1bbbd39fb4ac70a0b8][pandoc][convert-contents] Tool call failed Not connected
2025-05-20 14:11:29 error: [MCP][User: 682b0a1bbbd39fb4ac70a0b8][pandoc] Error calling "convert-contents" MCP tool: Not connected
2025-05-20 14:11:29 error: [api/server/controllers/agents/client.js #chatCompletion] Tool Error "convert-contents_mcp_pandoc" tool call failed: Not connected
2025-05-20 14:11:40 error: [addObjectToMeili] Error adding document to Meili fetch failed
2025-05-20 14:11:40 error: [addObjectToMeili] Error adding document to Meili fetch failed
2025-05-20 14:11:40 error: [addObjectToMeili] Error adding document to Meili fetch failed

Screenshots

No response

Code of Conduct

• I agree to follow this project's Code of Conduct

[danny-avila]

Add an appropriate timeout to your config:

https://www.librechat.ai/docs/configuration/librechat_yaml/object_structure/mcp_servers#timeout

mcpServers:
  slow_mcp:
    type: sse
    url: http://0.0.0.0:3001/sse
    timeout: 300000  # Configure this timeout for long operations

more info: #6629 (comment)