NanoBanana2 is a UE5 Gemini image-generation plugin that includes API key verification, single-shot generation, SSE streaming generation (text/image chunk callbacks), batch queue processing (per-item progress and final completion), prompt rewriting (style modes, thinking level, fallback model), and automatic retry on transient failures. Requests support model selection (gemini-3.1-flash-image-preview, gemini-3-pro-image-preview, gemini-2.5-flash-image), resolution, aspect ratio, output directory, Google Search tool toggle, token counting, and cost estimation, plus multi-reference-image input via ReferenceImagePaths (with model-aware limit checks and legacy single-image compatibility).

Results include HTTP status, retry count, token/cost metadata, text response, saved image path, and automatic history persistence.

The Blueprint library includes history/prompt-library CRUD + search, path helpers, model/aspect validation helpers, and image splitting (rows/columns with custom ratios).

The editor panel provides CN/EN switching, API-key visibility/verification state UI, multi-reference import/history reuse/viewport capture/preview/tag removal, queue building with per-item deletion, ellipsis + tooltip text handling for history/prompt entries, zoom/pan + draggable split lines on preview canvas, split tile grid preview, and level-viewport overlay preview.

google NanoBanana2 apikey：
https://aistudio.google.com/welcome

NanoBanana2 AI Image Generation & Editing Workflow Plugin doc：
https://github.com/zxwzxw/NanoBanana2_ue5/wiki/NanoBanana2_User_Guide_en