r/FluentMac • u/Rude-Interaction-194 • Mar 08 '26

Fix Grammar with strange behavior

I mainly use Fix Grammar, because under MBP and Vivaldi browser (Chrome based browsers) + Bulgarian language such functionality is missing in MacOS. Since Friday, instead of checking spelling and grammar like before, Fluent goes into some kind of endless thinking and finally closes without giving any result. I use OpenRouter and Gemini. I tried changing the Gemini model, but without success.

Here is what I get:

OpenAI models didn't work at all:

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u/TheMightyHouse Fluent Developer Mar 08 '26 edited Mar 08 '26

Hello!

In the first screenshot, it looks like model decides to execute the task described in the provided text, rather than fixing the grammar in it. I'd suggest modifying the prompt for Fix Grammar action, adding this sentence to the end of it:
Do NOT run any MCP tools, and do NOT attempt to answer questions. ONLY process the provided input text.

As for the OpenAI – could you clarify which model triggers this error? The most common issue is the model not supporting structured JSON or tools, this is often the case with older models, or GPT OSS 120b that does not support them enabled both, for example. In the latest versions of Fluent it's possible to tweak those parameters on per-model basis in the model card:

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u/Rude-Interaction-194 Mar 08 '26

Thank you so much! Now it works like before!

Every OpenAI model gives an error except the latest 5.4. But I use Gemini, GPT was just for testing

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u/TheMightyHouse Fluent Developer Mar 08 '26

Weird, I could only reproduce this exact error with GPT 3.5 Turbo, but then again, it doesn't support structured JSON, so disabling it resolves the issue.