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FCE-3839: update Gemini model to 3.8 - #86

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FCE-3839
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FCE-3839: update Gemini model to 3.8#86
Tay0108 wants to merge 3 commits into
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FCE-3839

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@Tay0108

@Tay0108 Tay0108 commented Sep 17, 2026 •
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Migrate Deep Sea Stories from Gemini 2.5 to gemini-3.8-live and update incompatible session configuration.

Fixed buttons clipping on desktop:
Screenshot 2026-09-18 at 13 06 30

Screenshot 2026-09-18 at 13 14 22

Also added the announcement banner:

image

@vercel

vercel Bot commented Sep 17, 2026 •
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The latest updates on your projects. Learn more about Vercel for GitHub.

Project Deployment Actions Updated
moq-demo Ready Ready Preview Sep 18, 2026 11:16am UTC

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@linear

linear Bot commented Sep 17, 2026

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FCE-3839

@Tay0108
Tay0108 requested a review from czerwiukk September 17, 2026 15:45
@Tay0108 Tay0108 changed the title feat: update Gemini model to 3.8 FCE-3839: update Gemini model to 3.8 Sep 17, 2026
czerwiukk
czerwiukk reviewed Sep 18, 2026
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Comment thread deep-sea-stories/packages/backend/src/agent/gemini/session.ts
{
functionDeclarations: [
{
behavior: Behavior.BLOCKING,

@czerwiukk czerwiukk Sep 18, 2026

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question:
whats blocking behavior?
Imagewhen you try to duck duck go your way to an answer

@Tay0108 Tay0108 Sep 18, 2026 •
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When Gemini calls endGame, generation pauses until our backend returns the tool result. Gemini 3.8 defaults to non-blocking tool calls, so setting this explicitly preserves the previous behavior and prevents the agent from continuing while the game is closing.

from docs on migrating from 3.1:

Asynchronous function calling: Async execution (behavior: NON_BLOCKING) is now the default function calling mode. You can still use synchronous blocking mode for backwards compatibility by setting behavior: BLOCKING on your tool declarations. Function scheduling (SILENT, WHEN_IDLE, INTERRUPTED) is supported.

https://ai.google.dev/gemini-api/docs/models/gemini-3.8-live

@Tay0108
Tay0108 requested a review from czerwiukk September 18, 2026 11:03
@czerwiukk czerwiukk self-assigned this Sep 18, 2026
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