# Reported issues for nanobanana-mcp-server Pod holds 8 of 8 problems reported by people outside the maintainer team. Issues filed by the project's own owners, members and collaborators are excluded entirely — a maintainer's release checklist is not a warning to a prospective user. Back to [nanobanana-mcp-server](/mcp/nanobanana-mcp-server). ## Most discussed ### Vertex AI is not responding. Vertex AI was working recently, but it's not working now. Sends request, no error, no response, just waits. I use Claude in the code. Could you please check? [Read the thread](https://github.com/zhongweili/nanobanana-mcp-server/issues/31) · 2026-05-17 · closed · external user · 2 comments ### region auth i think you need to set the region to global in order for it to work on VERTEX AI - GCP_REGION=us-central1 should be global instead [Read the thread](https://github.com/zhongweili/nanobanana-mcp-server/issues/28) · 2026-04-20 · closed · external user · 1 comment ### Edit mode ignores model_tier and always uses gemini-2.5-flash-image ## Bug Report ### Summary When using `generate_image` in **edit mode**, the `model_tier` parameter is completely ignored. The edit always uses `gemini-2.5-flash-image` (legacy Flash) regardless of the requested tier (`pro`, `nb2`, etc.). ### Steps to Reproduce 1. Generate an image with `model_tier: "pro"` and `resolution: "2k"` — works correctly, uses `gemini-3-pro-image-preview` 2. Edit the generated image with `model_tier: "pro"`, `mode: "edit"` — the API logs show `gemini-2.5-flash-image` [Read the thread](https://github.com/zhongweili/nanobanana-mcp-server/issues/20) · 2026-03-17 · closed · external user · 1 comment ### Feature Request: Add option to return full-resolution images in MCP response instead of thumbnails ## Summary Currently, the server returns thumbnail previews in the MCP response while saving full-resolution images to disk. It would be valuable to have a configuration option to return full-resolution images directly in the MCP response. ## Use Case Many MCP clients display images inline within their chat interface. When only thumbnails are returned, users see low-quality previews and must manually navigate to the disk path to view the actual generated images. This breaks the workflow and r [Read the thread](https://github.com/zhongweili/nanobanana-mcp-server/issues/14) · 2026-01-17 · closed · external user · 2 comments ### "image_size" not supported in google-genai==1.41.0, require later version of google-genai dependency Thank you for your code! In pyproject.toml, one of the dependencies is `"google-genai>=1.41.0"`, but if you use "google-genai==1.41.0", you will get a validation error since "image_size" is not in ImageConfig: https://github.com/googleapis/python-genai/blob/v1.41.0/google/genai/types.py#L3844 (on another note, neither is "output_mime_type", but that is another issue per https://github.com/zhongweili/nanobanana-mcp-server/issues/11) I upgraded google-genai to the latest version 1.57.0 and it wo [Read the thread](https://github.com/zhongweili/nanobanana-mcp-server/issues/12) · 2026-01-14 · closed · outside contributor · 2 comments ### Error: Error calling tool 'generate_image': output_mime_type parameter is not supported in Gemini API. When attempting to use the generate_image tool through the MCP server, the process fails with a Gemini API error stating that the output_mime_type parameter is not supported. ``` Error: Error calling tool 'generate_image': output_mime_type parameter is not supported in Gemini API. ``` [Read the thread](https://github.com/zhongweili/nanobanana-mcp-server/issues/11) · 2026-01-11 · closed · external user · 2 comments ### Broken Link: MCP Registry When clicking on the following link, the 404 page is reached: Installation Option 1: From MCP Registry (Recommended) This server is available in the [Model Context Protocol Registry](https://registry.modelcontextprotocol.io/servers/io.github.zhongweili/nanobanana-mcp-server). Install it using your MCP client. "Endpoint not found. Did you mean '/v0/servers/io.github.zhongweili/nanobanana-mcp-server'? See /docs for the API documentation." [Read the thread](https://github.com/zhongweili/nanobanana-mcp-server/issues/2) · 2025-10-02 · closed · external user · 1 comment ### Aspect Ratio workaround This is A wonderful MCP! surprised it's the first of it's kind. Very likely it will get more popular soon. Regarding aspect ratios - Nano banana for some reason cannot generate images that are not 1:1 aspect ratio right now. I saw a trick online that using edit instead of create, we can provide a desired aspect black image, and then it generates on top of that. https://www.youtube.com/watch?v=1ttvmsGSR_Y It would be interesting to integrate it into the server, as a separate non- 1:1 aspect ra [Read the thread](https://github.com/zhongweili/nanobanana-mcp-server/issues/1) · 2025-09-24 · closed · external user · 1 comment ## Most recent The remaining reports are on [the project's issue tracker](https://github.com/zhongweili/nanobanana-mcp-server/issues).