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[GH-ISSUE #177] issue: The call to the mcpo tool in open-webui returns empty #80

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opened 2026-10-18 21:11:26 +00:00 by bsakaguchi · 4 comments
bsakaguchi commented 2026-10-18 21:11:26 +00:00
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Originally created by @Soein on GitHub (Jun 10, 2025).
Original GitHub issue: https://github.com/open-webui/mcpo/issues/177

Check Existing Issues

  • I have searched the existing issues and discussions.
  • I am using the latest version of Open WebUI.

Installation Method

Git Clone

Open WebUI Version

v.6.10

Ollama Version (if applicable)

No response

Operating System

Ubuntu

Browser (if applicable)

Chrome

Confirmation

  • I have read and followed all instructions in README.md.
  • I am using the latest version of both Open WebUI and Ollama.
  • I have included the browser console logs.
  • I have included the Docker container logs.
  • I have provided every relevant configuration, setting, and environment variable used in my setup.
  • I have clearly listed every relevant configuration, custom setting, environment variable, and command-line option that influences my setup (such as Docker Compose overrides, .env values, browser settings, authentication configurations, etc).
  • I have documented step-by-step reproduction instructions that are precise, sequential, and leave nothing to interpretation. My steps:
  • Start with the initial platform/version/OS and dependencies used,
  • Specify exact install/launch/configure commands,
  • List URLs visited, user input (incl. example values/emails/passwords if needed),
  • Describe all options and toggles enabled or changed,
  • Include any files or environmental changes,
  • Identify the expected and actual result at each stage,
  • Ensure any reasonably skilled user can follow and hit the same issue.

Expected Behavior

When configuring the local mcpo in open-webui, every time a new conversation is started and the model is asked to call the mcp tool, the tool is now being called but no results are returned. However, checking the logs of the mcp service backend shows that the tool call was completed and returned, yet when viewed in open-webui, the content of the tool call is displayed as empty.

Actual Behavior

When configuring the local mcpo in open-webui, every time a new conversation is started and the model is asked to call the mcp tool, the tool is now being called but no results are returned. However, checking the logs of the mcp service backend shows that the tool call was completed and returned, yet when viewed in open-webui, the content of the tool call is displayed as empty.

Steps to Reproduce

When configuring the local mcpo in open-webui, every time a new conversation is started and the model is asked to call the mcp tool, the tool is now being called but no results are returned. However, checking the logs of the mcp service backend shows that the tool call was completed and returned, yet when viewed in open-webui, the content of the tool call is displayed as empty.

Logs & Screenshots

Image

Additional Information

No response

Originally created by @Soein on GitHub (Jun 10, 2025). Original GitHub issue: https://github.com/open-webui/mcpo/issues/177 ### Check Existing Issues - [x] I have searched the existing issues and discussions. - [x] I am using the latest version of Open WebUI. ### Installation Method Git Clone ### Open WebUI Version v.6.10 ### Ollama Version (if applicable) _No response_ ### Operating System Ubuntu ### Browser (if applicable) Chrome ### Confirmation - [x] I have read and followed all instructions in `README.md`. - [x] I am using the latest version of **both** Open WebUI and Ollama. - [x] I have included the browser console logs. - [x] I have included the Docker container logs. - [x] I have **provided every relevant configuration, setting, and environment variable used in my setup.** - [x] I have clearly **listed every relevant configuration, custom setting, environment variable, and command-line option that influences my setup** (such as Docker Compose overrides, .env values, browser settings, authentication configurations, etc). - [x] I have documented **step-by-step reproduction instructions that are precise, sequential, and leave nothing to interpretation**. My steps: - Start with the initial platform/version/OS and dependencies used, - Specify exact install/launch/configure commands, - List URLs visited, user input (incl. example values/emails/passwords if needed), - Describe all options and toggles enabled or changed, - Include any files or environmental changes, - Identify the expected and actual result at each stage, - Ensure any reasonably skilled user can follow and hit the same issue. ### Expected Behavior When configuring the local mcpo in open-webui, every time a new conversation is started and the model is asked to call the mcp tool, the tool is now being called but no results are returned. However, checking the logs of the mcp service backend shows that the tool call was completed and returned, yet when viewed in open-webui, the content of the tool call is displayed as empty. ### Actual Behavior When configuring the local mcpo in open-webui, every time a new conversation is started and the model is asked to call the mcp tool, the tool is now being called but no results are returned. However, checking the logs of the mcp service backend shows that the tool call was completed and returned, yet when viewed in open-webui, the content of the tool call is displayed as empty. ### Steps to Reproduce When configuring the local mcpo in open-webui, every time a new conversation is started and the model is asked to call the mcp tool, the tool is now being called but no results are returned. However, checking the logs of the mcp service backend shows that the tool call was completed and returned, yet when viewed in open-webui, the content of the tool call is displayed as empty. ### Logs & Screenshots <img width="1185" alt="Image" src="https://github.com/user-attachments/assets/7184f5f4-df86-4edc-913a-e9dced6a2167" /> ### Additional Information _No response_
bsakaguchi commented 2026-10-18 21:11:27 +00:00
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@BitFolio commented on GitHub (Jun 16, 2025):

My config with docker worked for a week with "openapi.json" endpoint. Then, stopped working after latest openwebui update.
mcpo:
container_name: mcpo
image: ghcr.io/open-webui/mcpo:main
ports:
- "8000:8000"
environment:
- API_KEY=kxd
volumes:
- /data/Applications/openwebui/mcpo/config.json:/app/config.json
command: ["--port", "8000", "--api-key", "kxd", "--config", "/app/config.json"]
restart: unless-stopped

<!-- gh-comment-id:2974772000 --> @BitFolio commented on GitHub (Jun 16, 2025): My config with docker worked for a week with "openapi.json" endpoint. Then, stopped working after latest openwebui update. mcpo: container_name: mcpo image: ghcr.io/open-webui/mcpo:main ports: - "8000:8000" environment: - API_KEY=kxd volumes: - /data/Applications/openwebui/mcpo/config.json:/app/config.json command: ["--port", "8000", "--api-key", "kxd", "--config", "/app/config.json"] restart: unless-stopped
bsakaguchi commented 2026-10-18 21:11:27 +00:00
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@ParamThakkar123 commented on GitHub (Jun 16, 2025):

I faced the same issues with ollama models and anthropic claude

<!-- gh-comment-id:2976107466 --> @ParamThakkar123 commented on GitHub (Jun 16, 2025): I faced the same issues with ollama models and anthropic claude
bsakaguchi commented 2026-10-18 21:11:27 +00:00
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@anselor commented on GitHub (Sep 12, 2025):

I found that tools from SSE MCPs do not load correctly when loaded via the config.json but if you specify the the MCP server as a command line switch it loads correctly.

<!-- gh-comment-id:3286659722 --> @anselor commented on GitHub (Sep 12, 2025): I found that tools from SSE MCPs do not load correctly when loaded via the config.json but if you specify the the MCP server as a command line switch it loads correctly.
bsakaguchi commented 2026-10-18 21:11:27 +00:00
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@ChinthapalliNikhithaChandana commented on GitHub (Nov 14, 2025):

I found that tools from SSE MCPs do not load correctly when loaded via the config.json but if you specify the the MCP server as a command line switch it loads correctly.

Hello @anselor , I have the same issue loading tools in mcpo from grafana-mcp server. Can you give an example for the solution you had mentioned. That will be helpful. Thanks.

<!-- gh-comment-id:3533775217 --> @ChinthapalliNikhithaChandana commented on GitHub (Nov 14, 2025): > I found that tools from SSE MCPs do not load correctly when loaded via the config.json but if you specify the the MCP server as a command line switch it loads correctly. Hello @anselor , I have the same issue loading tools in mcpo from grafana-mcp server. Can you give an example for the solution you had mentioned. That will be helpful. Thanks.
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