Hi, Romain. I have a question related to this. I don't mean to hijack this thread, but I didn't see a way to directly message you :).
I'm also creating a "tutor agent". It's job is to be a helpful guide to students rather than an answer giver. The knowledge source for the agent is a digital social studies textbook which it accesses directly (meaning I uploaded the file instead of using Sharepoint).
Here is my issue. I want the Agent to only use the content of the social studies textbook, so I turned off "use general knowledge." When doing that, the agent claims “no information was found that could help answer this” even when that information is present in the textbook.
The Power Platform Community suggested I try a smaller sized file for the Agent's knowledge source since the textbook was 1000 pages. So, I exported a 25 page section of the textbook (specifically about the American Civil War), and asked a question related to that content. The agent again replied, "no information was found that could help answer this," even though that information did exist.
If I turn on "use general knowledge" the agent is able to respond as expected.
I wondered if perhaps the agent was not accessing the knowledge source and relying on general knowledge, but in both circumstances (when general knowledge is "off" or "on") the agent does access the file.
One other curious thing to note: The agent is designed to ask the student questions about their assignment, and to find out what the student already knows about the topic by asking questions. When "use general knowledge" is on, the agent performs those tasks. When "use general knowledge" is off, the agent does not do those tasks.
Thanks for any insight you may have!