AI Studio: Empty response text with Thinking panel when search is requested but tool is off

Issue Summary:
In Google AI Studio using Gemini 3.8 Flash, generation finishes with only a collapsed Thoughts panel and no answer text or error message. This happens consistently when the prompt explicitly asks to search online while the Google Search tool is disabled.

Reproduction rate:
5 out of 5 attempts reproduced the issue.

Steps to reproduce:

  1. Open Google AI Studio prompts/chat with Gemini 3.8 Flash.
  2. Keep Google Search disabled in the tool settings.
  3. Send this prompt: Search online for recent rankings of large model capabilities.
  4. Wait for generation to finish. Only the Thoughts box appears; the answer area is completely blank.

Comparison:
Running the exact same prompt with Google Search toggled ON produces a normal, visible response with citations.

Expected behavior:
If search capability is turned off, the model should explain that it cannot browse the web or answer using internal knowledge, rather than silently completing with empty text.

Attachments:
Image 1: Blank response showing only the Thoughts panel.
Image 2: Comparison run with Google Search enabled showing the full answer.

Hello @NullPointerException ,

Thank you for reporting. This does seems like a valid bug. We’ve relayed this to our internal teams.