feat(Gemini Node): Add support for Nano Banana Pro model

[RomanDavydchuk]

Summary

Add support for Nano Banana Pro model for image generation and image editing

• Image generation: updated the RLC to not filter out the new gemini-3-pro-image-preview model
• Image editing: added a RLC that shows the "Nano Banana" models

Related Linear tickets, Github issues, and Community forum posts

https://linear.app/n8n/issue/NODE-3995/add-support-for-nano-banana-pro-in-gemini-node

Review / Merge checklist

• PR title and summary are descriptive. (conventions)
• Docs updated or follow-up ticket created.
• Tests included.
• PR Labeled with release/backport (if the PR is an urgent fix that needs to be backported)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

📢 Thoughts on this report? Let us know!

[cubic-dev-ai]

3 issues found across 4 files

Prompt for AI agents (all 3 issues)

Understand the root cause of the following 3 issues and fix them.


<file name="packages/@n8n/nodes-langchain/nodes/vendors/GoogleGemini/actions/image/edit.operation.ts">

<violation number="1" location="packages/@n8n/nodes-langchain/nodes/vendors/GoogleGemini/actions/image/edit.operation.ts:147">
Fetching `modelId` without a fallback leaves existing workflows with an empty model string, turning the request into `/v1beta/:generateContent` and causing the node to fail. Preserve the prior default model when no selection has been made.</violation>

<violation number="2" location="packages/@n8n/nodes-langchain/nodes/vendors/GoogleGemini/actions/image/edit.operation.ts:147">
Rule violated: **Tests**

Community PR Guidelines §2 require node changes to include tests. The new image-edit path now depends on the user-selected `modelId`, but none of the Gemini image edit tests exercise or assert that parameter, leaving the added functionality untested. Please update the tests (e.g., edit.operation.test.ts) to cover retrieving `modelId` and passing it to the API.</violation>
</file>

<file name="packages/@n8n/nodes-langchain/nodes/vendors/GoogleGemini/methods/listSearch.ts">

<violation number="1" location="packages/@n8n/nodes-langchain/nodes/vendors/GoogleGemini/methods/listSearch.ts:87">
Filtering image edit models by the &quot;Nano Banana&quot; label fails because the filter is consumed before the labels are appended, so searching for &quot;Nano&quot; yields no results. Apply the filter after decorating the names so users can search by the visible label.</violation>
</file>

_{Reply to cubic to teach it or ask questions. Re-run a review with @cubic-dev-ai review this PR}

[currents-bot]

✅

E2E Tests: n8n tests passed after 7m 46.4s

🟢 588 · 🔴 0 · ⚪️ 12 · 🟣 4

View Run Details

Run Details

• Project: n8n

• Groups: 2

• Framework: Playwright

• Run Status: Passed

• Commit: 027ab28

• Spec files: 96

• Overall tests: 600

• Duration: 7m 46.4s

• Parallelization: 9

Groups

GroupId	Results	Spec Files Progress
ui	🟢 539 · 🔴 0 · ⚪️ 12 · 🟣 4	90 / 90
ui:isolated	🟢 49 · 🔴 0 · ⚪️ 0	6 / 6

---

This message was posted automatically by currents.dev | Integration Settings

[ShireenMissi]

Tested locally and it works as expected 🎉