One-Line Prompt Restores NotebookLM Source Discipline After Gemini Rebrand, Tested Across 3 Versions
Updated
Updated · XDA Developers · Jul 19
One-Line Prompt Restores NotebookLM Source Discipline After Gemini Rebrand, Tested Across 3 Versions
1 articles · Updated · XDA Developers · Jul 19
Summary
A single appended sentence made NotebookLM answer only from provided documents, cite supporting sources, flag gaps, and stop offering web searches or extra tasks.
The workaround targets behavior the author says worsened around the Gemini Notebook rebrand, when the tool began suggesting web lookups, comparisons, and unsolicited outputs instead of stopping at source limits.
Three prompt tests shaped the final wording: one version halted out-of-scope answers, another produced a source-by-source audit, but only the combined line did both while blocking an unprompted lab-report template offer.
Two physics-lab tasks exposed the shift most clearly—asking about "XDA" triggered a web-search suggestion without the line, while a spherometer question showed NotebookLM could identify relevant PDFs and even flag 2 illegible files.