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Code Issues 775 Packages Projects Releases 10 Wiki Activity

GLM-4.5 and GLM-4.5-Flash Models Suddenly Unable to Call MCP Service Tools #18936

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opened 2026-02-21 19:53:43 -05:00 by yindo · 0 comments
yindo commented 2026-02-21 19:53:43 -05:00
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Originally created by @wzn1KhUGCtAj on GitHub (Oct 9, 2025).

Self Checks

  • I have read the Contributing Guide and Language Policy.
  • This is only for bug report, if you would like to ask a question, please head to Discussions.
  • I have searched for existing issues search for existing issues, including closed ones.
  • I confirm that I am using English to submit this report, otherwise it will be closed.
  • 【中文用户 & Non English User】请使用英语提交，否则会被关闭 ：）
  • Please do not modify this template :) and fill in all the required fields.

Dify version

1.8.1

Cloud or Self Hosted

Self Hosted (Docker)

Steps to reproduce

Before the end of October, models like GLM-4.5 and GLM-4.5-Flash in the Zhipu AI plugin could normally call my MCP service. However, for some reason, they are now unable to invoke tools for Q&A. I haven't made any changes to my setup, but the models consistently fail to call tools—each attempt simply ends the conversation without tool usage.
What could be causing this? Is it an issue with the Zhipu AI models themselves, or specifically with the Zhipu AI model plugin? Interestingly, other Zhipu AI models outside the 4.5 series can still call tools normally.

✔️ Expected Behavior

Has anyone encountered the same problem? Any help resolving this would be greatly appreciated.

❌ Actual Behavior

Before the end of October, models like GLM-4.5 and GLM-4.5-Flash in the Zhipu AI plugin could normally call my MCP service. However, for some reason, they are now unable to invoke tools for Q&A. I haven't made any changes to my setup, but the models consistently fail to call tools—each attempt simply ends the conversation without tool usage.
What could be causing this? Is it an issue with the Zhipu AI models themselves, or specifically with the Zhipu AI model plugin? Interestingly, other Zhipu AI models outside the 4.5 series can still call tools normally.

Originally created by @wzn1KhUGCtAj on GitHub (Oct 9, 2025). ### Self Checks - [x] I have read the [Contributing Guide](https://github.com/langgenius/dify/blob/main/CONTRIBUTING.md) and [Language Policy](https://github.com/langgenius/dify/issues/1542). - [x] This is only for bug report, if you would like to ask a question, please head to [Discussions](https://github.com/langgenius/dify/discussions/categories/general). - [x] I have searched for existing issues [search for existing issues](https://github.com/langgenius/dify/issues), including closed ones. - [x] I confirm that I am using English to submit this report, otherwise it will be closed. - [x] 【中文用户 & Non English User】请使用英语提交，否则会被关闭 ：） - [x] Please do not modify this template :) and fill in all the required fields. ### Dify version 1.8.1 ### Cloud or Self Hosted Self Hosted (Docker) ### Steps to reproduce Before the end of October, models like GLM-4.5 and GLM-4.5-Flash in the Zhipu AI plugin could normally call my MCP service. However, for some reason, they are now unable to invoke tools for Q&A. I haven't made any changes to my setup, but the models consistently fail to call tools—each attempt simply ends the conversation without tool usage. What could be causing this? Is it an issue with the Zhipu AI models themselves, or specifically with the Zhipu AI model plugin? Interestingly, other Zhipu AI models outside the 4.5 series can still call tools normally. ### ✔️ Expected Behavior Has anyone encountered the same problem? Any help resolving this would be greatly appreciated. ### ❌ Actual Behavior Before the end of October, models like GLM-4.5 and GLM-4.5-Flash in the Zhipu AI plugin could normally call my MCP service. However, for some reason, they are now unable to invoke tools for Q&A. I haven't made any changes to my setup, but the models consistently fail to call tools—each attempt simply ends the conversation without tool usage. What could be causing this? Is it an issue with the Zhipu AI models themselves, or specifically with the Zhipu AI model plugin? Interestingly, other Zhipu AI models outside the 4.5 series can still call tools normally.
yindo closed this issue 2026-02-21 19:53:43 -05:00
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Reference: langgenius/dify#18936
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