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How to limit the response language

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Posted on by WC-14010238-0 Microsoft Employee

The requirement is when user inputs Chinses, the Copilot Agent will response with Chinese. If user input non-Chinses, the agent will response with English.

The problem currently we have:
Sometimes, when user inputs Chinses, the agent response with English. And we found if user input 4 Chinese characters, the agent will response with English, but if user inputs 6 Chinese characters as the same requests with the 4 Chinese characters, the agent can response with Chinese correctly.

What's the problem here? What configurations should we set for the agent to let it follow the Language limitation?

What we have tried:
1. Add Language limitation prompts on Agent Instructions.
2. Add a custom topic with Prompts node to limit the language before AI model searching the Knowledge.
3. Add Language limitation prompts in Create generative answers node's Content moderation level text box.
None of them can let the agent response with correct language 100%.

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Autonomous agents

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chiaraalina 2,425 Super User 2026 Season 1 on at

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Hi

Did you also set up the Language in the Agent Settings? IF not please add it here, don't rely on instruction only:

In addition, you can create a topic that runs on every message to detect the user’s language and set the conversation language accordingly:

Create a topic with trigger: A message is received

Detect whether the incoming message is Chinese or not

Set System.User.Language to:

Locale.Chinese_Simplified if Chinese

Locale.English otherwise

This approach is much more consistent.

Detect the language of the user message.

If Chinese, output exactly zh-CN. Otherwise output exactly en-US.

Output only the code.

Message:

You could also do deterministic detection.

Let me know if it helped!

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S-Venkadesh 1,215 Super User 2026 Season 1 on at

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Hi @WC-14010238-0,

In addition to @chiaraalina suggestion, if the agent is not consistently responding in the desired language, then—along with the existing steps—add a Generative Answers node and include the instruction:
“Respond in System.User.Language.”
This helps enforce language consistency and improves the overall reliability of the responses.

✔️ If this answered your question, please click “Does this answer your question?” so it can help others in the community too.
🩵 If it helped, please give it a Like!

Best regards,

S. Venkadesh

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WC-14010238-0 Microsoft Employee on at

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@chiaraalina @S-Venkadesh Thanks for your quick response.

According to the steps that you suggested, I can reduce the repro rate for the language mis-matched issue to failed 3 times when tried 50 times. I think it should be the best result now. Because the official document mentioned that "Instructions requesting multilingual support might work, but they aren't guaranteed. The multilingual feature isn't tested or officially supported."

Referenced link: Instruction guidance for generative orchestration - Microsoft Copilot Studio | Microsoft Learn

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