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read llm model failed: request failed: [tongyi] Error: PluginInvokeError: {"args":{"description":"[models] Error: 'description'"},"error_type":"InvokeError #438
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Originally created by @wangpanfeng158 on GitHub (Jul 10, 2025).
Self Checks
Dify version
1.5.1
Cloud or Self Hosted
Self Hosted (Docker)
Steps to reproduce
When I was using chatflow, I configured an agent node and used the qwen max latest model. The error message was: Run failed: Failed to transform agent message: PluginInvokeError: {"args":{},"error_type":"Exception","message":"read llm model failed: request failed: [tongyi] Error: PluginInvokeError: {"args":{"description":"[models] Error: 'description'"},"error_type":"InvokeError","message":"[models] Error: 'description'"}"}
Here is a screenshot
✔️ Expected Behavior
No response
❌ Actual Behavior
No response
@dosubot[bot] commented on GitHub (Jul 10, 2025):
Hi @wangpanfeng158! I'm Dosu and I’m helping the dify team.
This error is caused by the Tongyi (Qwen) plugin or model integration missing a required description field in its schema or manifest. Dify now expects this field for LLM plugins, and its absence leads to the PluginInvokeError you’re seeing. This is a known issue, especially with recent Dify versions and certain Tongyi plugin releases. Users have reported that some plugin versions (like 0.0.7 or 0.0.18) work, while others (such as 0.0.25) break compatibility with Qwen models in agent nodes or workflows. Upgrading or downgrading the Tongyi plugin, or reinstalling it from the Dify Marketplace, has resolved the issue for some users. Also, make sure the plugin was initialized with full network access so it could install all dependencies during setup. More details and user experiences are documented here, here, and here.
If you’re using MCP or structured output features, be aware that the official Tongyi plugin may not be fully compatible, as it tries to access the description field in each property and fails if it’s missing. The Qwen model from the Tongyi provider works in some configurations, but plugin version and Dify version compatibility are key factors source.
Try rolling back to a known working Tongyi plugin version (such as 0.0.18), or reinstall the plugin from the Marketplace. If you built or installed the plugin in an environment with network restrictions, ensure it can access the internet and reinitialize it. If you have custom model schemas or plugin manifests, make sure they include a description field for each model property.
Let me know if you need a sample schema or more details on plugin configuration.
To reply, just mention @dosu.
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@wangpanfeng158 commented on GitHub (Jul 10, 2025):
Thank you very much. I chose Dify's official agent strategy in the agent and solved this problem