feat(gemini): Gemini 3.5 Flash Support

[jeanbispo]

Related GitHub Issue

Closes: #330

Description

Add Gemini 3.5 Flash Support

Test Procedure

• Verified the model appears in the Gemini and Vertex provider model list
• Confirmed the application runs successfully after the change

Pre-Submission Checklist

• Issue Linked: This PR is linked to an approved GitHub Issue (see "Related GitHub Issue" above).
• Scope: My changes are focused on the linked issue (one major feature/fix per PR).
• Self-Review: I have performed a thorough self-review of my code.
• Contribution Guidelines: I have read and agree to the Contributor Guidelines.

Documentation Updates

• No documentation updates are required.

Additional Notes

This PR only adds a new model configuration entry.

Summary by CodeRabbit

• New Features
  • Gemini 3.5 Flash is now available platform-wide, offering image input support, prompt caching, and selectable reasoning-effort levels (default: medium).
  • Updated model provides larger context/token capacity and is available with new input/output pricing tiers.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 9881dedb-1893-4873-a4ba-43cd44e5ecef

📥 Commits

Reviewing files that changed from the base of the PR and between c857546 and f413957.

📒 Files selected for processing (2)

• packages/types/src/providers/gemini.ts
• packages/types/src/providers/vertex.ts

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📝 Walkthrough

Walkthrough

This pull request adds support for the gemini-3.5-flash model across both Gemini and Vertex AI provider type definitions. Each addition includes token limits, context window, capability flags for images and prompt caching, reasoning-effort settings, and pricing/cache read-write costs.

Changes

Gemini 3.5 Flash Model Support

Layer / File(s)	Summary
Model definition additions packages/types/src/providers/gemini.ts, packages/types/src/providers/vertex.ts	Adds gemini-3.5-flash entries to both geminiModels and vertexModels with matching token limits (max 8,000, context 32,000), capability support (images, prompt cache, reasoning effort with default "medium"), explicit supportsReasoningBudget: false, and pricing fields including cache read/write costs.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• Zoo-Code-Org/Zoo-Code#317: Adds "gemini-3.5-flash" handling behavior elsewhere (affects model registration/lookup logic).

Suggested reviewers

• taltas
• navedmerchant
• hannesrudolph
• JamesRobert20

Poem

🐰 A flash of model hops in light,
Tokens counted, pricing tight,
From Gemini to Vertex shore,
I cache and hop and code some more,
🎉🐇

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'feat(gemini): Gemini 3.5 Flash Support' clearly and concisely summarizes the primary change: adding support for the Gemini 3.5 Flash model.
Description check	✅ Passed	The description includes the required 'Related GitHub Issue' section (Closes: #330), a 'Description' section explaining the changes, 'Test Procedure' detailing verification steps, and a completed pre-submission checklist with most items checked.
Linked Issues check	✅ Passed	The PR successfully implements the requirement from issue #330 by adding 'gemini-3.5-flash' model entries to both Gemini and Vertex provider model lists with appropriate configuration.
Out of Scope Changes check	✅ Passed	All changes are in-scope: only adds new model definition entries to geminiModels and vertexModels constants with no unrelated modifications.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

Warning

There were issues while running some tools. Please review the errors and either fix the tool's configuration or disable the tool if it's a critical failure.

🔧 ESLint

If the error stems from missing dependencies, add them to the package.json file. For unrecoverable errors (e.g., due to private dependencies), disable the tool in the CodeRabbit configuration.

packages/types/src/providers/gemini.ts

ESLint skipped: missing config or dependency (missing-dependency). The ESLint configuration references a package that is not available in the sandbox.

packages/types/src/providers/vertex.ts

ESLint skipped: the ESLint configuration for this file references a package that is not available in the sandbox.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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