Gemini 2.5 Flash Image MCP

A Model Context Protocol (MCP) server for conversational image generation and editing with Google's Gemini 2.5 Flash Image Preview. Designed to be easy to install and use from Claude Code and other MCP clients.

Key Features

Text-to-Image: Generate images from detailed prompts
Image Editing: Edit images with natural language instructions
Multi-Image Composition / Style Transfer: Combine images or transfer styles
File Save Option: Return base64 image and optionally save to file
Provider-Agnostic MCP: Works in any MCP-enabled client

Requirements

Node.js 18 or newer
An MCP client (Claude Code, Cursor, VS Code, Windsurf, etc.)
Google Gemini API Key: set GEMINI_API_KEY

Get a Gemini API key

Follow these steps to obtain an API key from Google AI Studio:

Open Google AI Studio and sign in: https://aistudio.google.com/apikey
Click “Create API key” (or “Manage keys” if you already have one)
Copy the generated key
Set it as an environment variable on your machine when running this server

Examples:

# macOS / Linux (bash/zsh)
export GEMINI_API_KEY="YOUR_API_KEY"

# Windows PowerShell
$env:GEMINI_API_KEY="YOUR_API_KEY"

Getting Started

First, install the MCP server with your client. The following examples center on Claude Code usage.

Standard config works in most tools:

{
  "mcpServers": {
    "gemini-2-5-flash-mcp": {
      "command": "npx",
      "args": ["@taiyokimura/gemini-2-5-flash-mcp@latest"]
    }
  }
}

Quick usage (Claude Code)

# npx（非対話フラグ付き） + APIキー同時指定（Claudeの -e 指定）
claude mcp add gemini-2-5-flash-mcp -s user -e GEMINI_API_KEY="YOUR_API_KEY" -- npx -y @taiyokimura/gemini-2-5-flash-mcp@latest

# グローバルインストール + APIキー同時指定（Claudeの -e 指定）
npm i -g @taiyokimura/gemini-2-5-flash-mcp \
  && claude mcp add gemini-2-5-flash-mcp -s user -e GEMINI_API_KEY="YOUR_API_KEY" -- gemini-2-5-flash-mcp

# HTTP モードで登録（SSE既定）例（対応クライアントのみ）
# ※ HTTP モードはこのプロセス自体がHTTPサーバとして常駐します
claude mcp add gemini-2-5-flash-mcp -s user \
  -e GEMINI_API_KEY="YOUR_API_KEY" \
  -e MCP_TRANSPORT="http" \
  -e MCP_HTTP_PORT="7801" \
  -e MCP_HTTP_PATH="/mcp" \
  -- npx -y @taiyokimura/gemini-2-5-flash-mcp@latest

Streamable HTTP mode（実験的）

STDIO の代わりに Streamable HTTP を使うこともできます。MCP クライアントが Streamable HTTP に対応している場合のみ利用してください。

サーバーを HTTP モードで起動

export MCP_TRANSPORT=http
export GEMINI_API_KEY=YOUR_API_KEY
# 任意（既定: 7801, /mcp, SSE）
export MCP_HTTP_PORT=7801
export MCP_HTTP_PATH=/mcp
export MCP_HTTP_ENABLE_JSON=false

npm run build
node ./build/index.js
# => HTTP transport listening on http://localhost:7801/mcp

クライアント側設定（例: Streamable HTTP対応クライアント）

Type: HTTP (Streamable)
URL: http://localhost:7801/mcp

注:

SSE ストリーミングが既定。JSONレスポンスで使いたい場合は MCP_HTTP_ENABLE_JSON=true。
セッションはサーバー側で生成（stateful）。完全 stateless にしたい場合はコード側で sessionIdGenerator: undefined に変更可能です。

Use the Claude Code CLI to add the MCP server:

claude mcp add gemini-2-5-flash-mcp -s user -- npx @taiyokimura/gemini-2-5-flash-mcp@latest

Remove if needed:

claude mcp remove gemini-2-5-flash-mcp

Follow the MCP install guide and use the standard config above.

Guide: https://modelcontextprotocol.io/quickstart/user

Go to Cursor Settings → MCP → Add new MCP Server.

Use the following:

Name: gemini-2-5-flash-mcp
Type: command
Command: npx
Args: @taiyokimura/gemini-2-5-flash-mcp@latest
Auto start: on (optional)

Add via CLI:

code --add-mcp '{"name":"gemini-2-5-flash-mcp","command":"npx","args":["@taiyokimura/gemini-2-5-flash-mcp@latest"]}'

Or use the standard config in settings.

Add MCP Server with:

Command: npx
Args: ["@taiyokimura/gemini-2-5-flash-mcp@latest"]

Advanced settings → Extensions → Add custom extension:

Type: STDIO
Command: npx
Args: @taiyokimura/gemini-2-5-flash-mcp@latest
Enabled: true

Example ~/.config/opencode/opencode.json:

{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "gemini-2-5-flash-mcp": {
      "type": "local",
      "command": [
        "npx",
        "@taiyokimura/gemini-2-5-flash-mcp@latest"
      ],
      "enabled": true
    }
  }
}

Open Qodo Gen → Connect more tools → + Add new MCP → Paste the standard config above → Save.

Follow Windsurf MCP documentation and use the standard config above.

Docs: https://docs.windsurf.com/windsurf/cascade/mcp

Environment Variables

GEMINI_API_KEY (required)
GEMINI_IMAGE_ENDPOINT (optional) default: https://generativelanguage.googleapis.com/v1beta/models/gemini-2.5-flash-image-preview:generateContent
MCP_NAME (optional, default: gemini-2-5-flash-mcp)

Available Tools

1. generate_image

Generate an image from a text prompt.

Parameters:

prompt (required): Detailed description to generate
saveToFilePath (optional): Path to save the image

Example input:

{
  "prompt": "Create a picture of a nano banana dish in a fancy restaurant with a Gemini theme",
  "saveToFilePath": "./gemini-native-image.png"
}

2. edit_image

Edit an image using a prompt.

Parameters:

prompt (required): Edit instruction
image (required): { dataBase64?: string, path?: string, mimeType?: string }
saveToFilePath (optional)

Example input:

{
  "prompt": "Add a small, knitted wizard hat to the cat",
  "image": { "path": "./cat.jpeg", "mimeType": "image/jpeg" },
  "saveToFilePath": "./gemini-edited-image.png"
}

3. compose_images

Combine elements from multiple images.

Parameters:

prompt (required)
images (required): Array of image inputs (2-3 recommended)
saveToFilePath (optional)

4. style_transfer

Transfer the style of one image to another.

Parameters:

prompt (optional)
baseImage (required)
styleImage (required)
saveToFilePath (optional)

Development

Run locally:

npm install
npm run build
npx .

Name Consistency & Troubleshooting

Always use CANONICAL_ID (gemini-2-5-flash-mcp) for identifiers and keys.
Use CANONICAL_DISPLAY (Gemini 2.5 Flash MCP) only for UI labels.
Do not mix different names across clients.

Consistency Matrix:

npm package name → gemini-2-5-flash-mcp
Binary name → gemini-2-5-flash-mcp
MCP server name (SDK metadata) → gemini-2-5-flash-mcp
Env default MCP_NAME → gemini-2-5-flash-mcp
Client registry key → gemini-2-5-flash-mcp
UI label → Gemini 2.5 Flash MCP

Conflict Cleanup:

Remove any old entries like "GeminiFlash" and re-add with gemini-2-5-flash-mcp.
Ensure global registries only use gemini-2-5-flash-mcp for keys.
Cursor: configure in the UI only. This project does not include .cursor/mcp.json.

References

MCP SDK: https://modelcontextprotocol.io/docs/sdks
Architecture: https://modelcontextprotocol.io/docs/learn/architecture
Server concepts: https://modelcontextprotocol.io/docs/learn/server-concepts
Server spec (2025-06-18): https://modelcontextprotocol.io/specification/2025-06-18/server/index
Gemini image generation: https://ai.google.dev/gemini-api/docs/image-generation

This server cannot be installed

security - not tested

license - not found

quality - not tested

How are these scores calculated?

hybrid server

The server is able to function both locally and remotely, depending on the configuration or use case.

Enables conversational image generation and editing with Google's Gemini 2.5 Flash Image Preview. Supports text-to-image generation, natural language image editing, multi-image composition, and style transfer with optional file saving.

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