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[GH-ISSUE #14726] issue: When the LLM calls mcp tools that return image data, the front UI can not display the image #56013

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opened 2026-05-05 18:30:11 -05:00 by GiteaMirror · 1 comment
GiteaMirror commented 2026-05-05 18:30:11 -05:00
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Originally created by @tangzhong1 on GitHub (Jun 6, 2025).
Original GitHub issue: https://github.com/open-webui/open-webui/issues/14726

Check Existing Issues

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

Installation Method

Pip Install

Open WebUI Version

latest

Ollama Version (if applicable)

No response

Operating System

macOS

Browser (if applicable)

No response

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

The front UI can not display the base64 image data return from mcp server. I have tried several different ways to solve this problem, but none of them work. Anyone can help? I would appreciate it!

Actual Behavior

...

Steps to Reproduce

...

Logs & Screenshots

Image

Additional Information

No response

Originally created by @tangzhong1 on GitHub (Jun 6, 2025). Original GitHub issue: https://github.com/open-webui/open-webui/issues/14726 ### Check Existing Issues - [x] I have searched the existing issues and discussions. - [x] I am using the latest version of Open WebUI. ### Installation Method Pip Install ### Open WebUI Version latest ### Ollama Version (if applicable) _No response_ ### Operating System macOS ### 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** 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 The front UI can not display the base64 image data return from mcp server. I have tried several different ways to solve this problem, but none of them work. Anyone can help? I would appreciate it! ### Actual Behavior ... ### Steps to Reproduce ... ### Logs & Screenshots <img width="891" alt="Image" src="https://github.com/user-attachments/assets/a8435d6c-5b52-438f-9dc2-3a127a397f40" /> ### Additional Information _No response_
GiteaMirror added the bug label 2026-05-05 18:30:11 -05:00
GiteaMirror commented 2026-05-05 18:30:14 -05:00
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@tjbck commented on GitHub (Jun 6, 2025):

Image should be returned as a raw string and not a markdown format

<!-- gh-comment-id:2948998607 --> @tjbck commented on GitHub (Jun 6, 2025): Image should be returned as a raw string and not a markdown format
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Reference: github-starred/open-webui#56013
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