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[GH-ISSUE #70] issue: tool list not usable with config.json file #32

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opened 2026-10-18 21:10:38 +00:00 by bsakaguchi · 2 comments

bsakaguchi commented

2026-10-18 21:10:38 +00:00

Owner

Originally created by @omersavas26 on GitHub (Apr 12, 2025).
Original GitHub issue: https://github.com/open-webui/mcpo/issues/70

Check Existing Issues

I have searched the existing issues and discussions.
I am using the latest version of mcpo.

mcpo Version

v0.0.10

Open WebUI Version (if applicable)

v0.6.2

Operating System

docker python:3.12-slim-bookworm

Browser (if applicable)

No response

Confirmation

I have read and followed all instructions in README.md.
I am using the latest version of both MCPO and Open WebUI.
I have included the browser console logs.
I have included the Docker container logs.
I have listed steps to reproduce the bug in detail.

Expected Behavior

When I start the mcpo service with config.json, I expect to be able to use all the tools in open webui.

Actual Behavior

Hello. I am trying to present more than one tool at the same time by starting the mcpo application with the config.json file. The service starts successfully.

Docker container logs:

uvx mcpo --host 0.0.0.0 --port 8000 --config /app/config/config.json
Starting MCP OpenAPI Proxy with config file: /app/config/config.json
INFO: Started server process [578]
INFO: Waiting for application startup.
INFO: Application startup complete.
INFO: Uvicorn running on http://0.0.0.0:8000 (Press CTRL+C to quit)
INFO: 10.0.0.2:12557 - "GET /openapi.json HTTP/1.1" 200 OK

And I confirm that the service is running via the browser. http://172.28.247.14:8000/openapi.json:

Then I enter the open webui settings interface and confirm that it is communicating successfully.

Then when I want to use the tool in a model, the tool details are not shown in the list. It only communicates with the mcpo server, but the tool list is not shown. Only the description in openapi.json is shown. This is not a tool list.

Actually I would like to see a tool list like the one below. This was taken from the official documentation site.(https://docs.openwebui.com/openapi-servers/open-webui)

Finally, I want to do one more test. I start mcpo with only one mcp service, not with config.json.

uvx mcpo --port 8000 -- uvx mcp-server-time --local-timezone=America/New_York

This time, as I expected, the path is filled in openapi.json

Then, when I enter the open webui interface, this serfer tool list comes as I expected.

Steps to Reproduce

start mcpo server on docker
connect from open webui to mcpo service
try use tool in a llm model

Logs & Screenshots

Docker container logs:

uvx mcpo --host 0.0.0.0 --port 8000 --config /app/config/config.json
Starting MCP OpenAPI Proxy with config file: /app/config/config.json
INFO: Started server process [578]
INFO: Waiting for application startup.
INFO: Application startup complete.
INFO: Uvicorn running on http://0.0.0.0:8000 (Press CTRL+C to quit)
INFO: 10.0.0.2:12557 - "GET /openapi.json HTTP/1.1" 200 OK

http://172.28.247.14:8000/openapi.json:

openwebui

This is not a tool list.

Additional Information

No response

Originally created by @omersavas26 on GitHub (Apr 12, 2025). Original GitHub issue: https://github.com/open-webui/mcpo/issues/70 ### Check Existing Issues - [x] I have searched the existing issues and discussions. - [x] I am using the latest version of mcpo. ### mcpo Version v0.0.10 ### Open WebUI Version (if applicable) v0.6.2 ### Operating System docker python:3.12-slim-bookworm ### Browser (if applicable) _No response_ ### Confirmation - [x] I have read and followed all instructions in `README.md`. - [x] I am using the latest version of **both** MCPO and Open WebUI. - [x] I have included the browser console logs. - [x] I have included the Docker container logs. - [x] I have listed steps to reproduce the bug in detail. ### Expected Behavior When I start the mcpo service with config.json, I expect to be able to use all the tools in open webui. ### Actual Behavior Hello. I am trying to present more than one tool at the same time by starting the mcpo application with the config.json file. The service starts successfully. Docker container logs: > uvx mcpo --host 0.0.0.0 --port 8000 --config /app/config/config.json Starting MCP OpenAPI Proxy with config file: /app/config/config.json INFO: Started server process [578] INFO: Waiting for application startup. INFO: Application startup complete. INFO: Uvicorn running on http://0.0.0.0:8000 (Press CTRL+C to quit) INFO: 10.0.0.2:12557 - "GET /openapi.json HTTP/1.1" 200 OK And I confirm that the service is running via the browser. http://172.28.247.14:8000/openapi.json: ![Image](https://github.com/user-attachments/assets/7379d201-a739-4715-ab81-219738675589) Then I enter the open webui settings interface and confirm that it is communicating successfully. ![Image](https://github.com/user-attachments/assets/3e8dc287-0b47-4431-9d1a-a41d5617b9a1) Then when I want to use the tool in a model, the tool details are not shown in the list. It only communicates with the mcpo server, but the tool list is not shown. Only the description in openapi.json is shown. This is not a tool list. ![Image](https://github.com/user-attachments/assets/2eab2890-53dc-400c-a57f-a7cf4adbbb52) Actually I would like to see a tool list like the one below. This was taken from the official documentation site.(https://docs.openwebui.com/openapi-servers/open-webui) ![Image](https://github.com/user-attachments/assets/eec9da72-ac85-4fbf-9ec1-c5a888f6fd27) Finally, I want to do one more test. I start mcpo with only one mcp service, not with config.json. > uvx mcpo --port 8000 -- uvx mcp-server-time --local-timezone=America/New_York This time, as I expected, the path is filled in openapi.json ![Image](https://github.com/user-attachments/assets/21e8c3ab-03f3-430a-8f15-abb84b21cbf6) Then, when I enter the open webui interface, this serfer tool list comes as I expected. ![Image](https://github.com/user-attachments/assets/3b93e0f7-df88-4b53-a70b-547f17d3c1ec) ### Steps to Reproduce 1. start mcpo server on docker 2. connect from open webui to mcpo service 3. try use tool in a llm model ### Logs & Screenshots Docker container logs: > uvx mcpo --host 0.0.0.0 --port 8000 --config /app/config/config.json Starting MCP OpenAPI Proxy with config file: /app/config/config.json INFO: Started server process [578] INFO: Waiting for application startup. INFO: Application startup complete. INFO: Uvicorn running on http://0.0.0.0:8000 (Press CTRL+C to quit) INFO: 10.0.0.2:12557 - "GET /openapi.json HTTP/1.1" 200 OK http://172.28.247.14:8000/openapi.json: ![Image](https://github.com/user-attachments/assets/7379d201-a739-4715-ab81-219738675589) openwebui ![Image](https://github.com/user-attachments/assets/3e8dc287-0b47-4431-9d1a-a41d5617b9a1) This is not a tool list. ![Image](https://github.com/user-attachments/assets/2eab2890-53dc-400c-a57f-a7cf4adbbb52) ### Additional Information _No response_

bsakaguchi

2026-10-18 21:10:38 +00:00

closed this issue
added the
bug
label

bsakaguchi commented

2026-10-18 21:10:39 +00:00

Author

Owner

@tjbck commented on GitHub (Apr 12, 2025):

Please check for existing previous issues and docs.

https://docs.openwebui.com/openapi-servers/open-webui/#-optional-using-a-config-file-with-mcpo

@tjbck commented on GitHub (Apr 12, 2025): Please check for existing previous issues and docs. https://docs.openwebui.com/openapi-servers/open-webui/#-optional-using-a-config-file-with-mcpo

bsakaguchi commented

2026-10-18 21:10:40 +00:00

Author

Owner

@omersavas26 commented on GitHub (Apr 12, 2025):

I'm sorry I never noticed. Thanks.

@omersavas26 commented on GitHub (Apr 12, 2025): I'm sorry I never noticed. Thanks.

bsakaguchi referenced this issue

2026-10-18 21:12:14 +00:00

[PR #32] [MERGED] 0.0.7 #148

bsakaguchi referenced this issue

2026-10-18 21:12:16 +00:00