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Failed to invoke tool: Failed to invoke tool: Output variable result[0] must be a string #9811

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opened 2026-02-21 18:39:13 -05:00 by yindo · 0 comments
yindo commented 2026-02-21 18:39:13 -05:00
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Originally created by @rainvstar on GitHub (Mar 7, 2025).

Self Checks

  • 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 (我已阅读并同意 Language Policy).
  • [FOR CHINESE USERS] 请务必使用英文提交 Issue，否则会被关闭。谢谢！:）
  • Please do not modify this template :) and fill in all the required fields.

Dify version

1.0.0

Cloud or Self Hosted

Self Hosted (Docker)

Steps to reproduce

Image
I hava a workflow, the output is Array[Object]。I publish this workflow as a tool。
when I use this tool in another workflow ,it goes wrong.

Image
Failed to invoke tool: Failed to invoke tool: Output variable result[0] must be a string

I don't understand how to deliever the output。

✔️ Expected Behavior

No response

❌ Actual Behavior

No response

Originally created by @rainvstar on GitHub (Mar 7, 2025). ### Self Checks - [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 (我已阅读并同意 [Language Policy](https://github.com/langgenius/dify/issues/1542)). - [x] [FOR CHINESE USERS] 请务必使用英文提交 Issue，否则会被关闭。谢谢！:） - [x] Please do not modify this template :) and fill in all the required fields. ### Dify version 1.0.0 ### Cloud or Self Hosted Self Hosted (Docker) ### Steps to reproduce ![Image](https://github.com/user-attachments/assets/92935626-fc9b-4d1f-a9aa-c33130a37c54) I hava a workflow, the output is Array[Object]。I publish this workflow as a tool。 when I use this tool in another workflow ,it goes wrong. ![Image](https://github.com/user-attachments/assets/86b41fb8-dce0-44d7-bab5-2b0e13d7f1e4) Failed to invoke tool: Failed to invoke tool: Output variable `result[0]` must be a string I don't understand how to deliever the output。 ### ✔️ Expected Behavior _No response_ ### ❌ Actual Behavior _No response_
yindo added the 🐞 buggood first issue labels 2026-02-21 18:39:13 -05:00
yindo closed this issue 2026-02-21 18:39:13 -05:00
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Reference: langgenius/dify#9811
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