/nano-banana-build

Thinking Process & Thought Signatures

Gemini 3 Pro Image Preview uses a default "Thinking" process to refine composition and logic before generation.

Accessing Thoughts

You can inspect the thoughts that led to the final image.

for part in response.parts:
    if part.thought:
        if part.text:
            print(f"Thought: {part.text}")
        elif part.inline_data:
            # Interim thought image
            image = part.as_image()
            image.show()

Thought Signatures

Crucial for Multi-turn: Thought signatures preserve reasoning context across turns.

• Automatic Handling: If using client.chats or appending the full response object to history, the SDK handles this automatically.
• Manual Handling: If manually constructing JSON payloads, you must pass back the thought_signature field exactly as received.

Structure

• The first non-thought text part has a signature.
• All inline image parts (except thought images) have signatures.
• Thought parts do not have signatures.

Failure to circulate thought signatures may cause the response to fail.