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flow-mcp

by alarconcesar
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Flow MCP 🎨

Python 3.11+ MCP License: MIT

MCP server for generating images via Google Flow — no daily quota limits.

Claude Code (or any MCP client) can generate images using Google Flow's batchGenerateImages API directly through a Playwright browser context with your saved authentication, bypassing the Flow Agent chat quota (~10 images/day).

Features

  • Text-to-Image — generate images from text prompts

  • Image-to-Image — use a reference image (pass reference_image)

  • No quota limits — calls the API directly, not through the chat

  • Persistent browser pool — reuses Chrome across generations (faster)

  • Auto-retry — refreshes auth token if it expires

  • Progress reporting — shows generation progress in Claude Code

  • No external CLI dependencies — includes its own auth/login

  • Cross-platform — Windows, macOS, Linux (incl. headless)

Related MCP server: Nano Banana MCP

Requirements

Dependency

Notes

Python 3.11+ (or uv)

Google Chrome or Playwright's Chromium

For authentication & generation

Xvfb (Linux headless only)

:99 display

Installation

Prerequisites

  • Python 3.11+

  • Google Chrome (for authentication)

  • Playwright browsers (for generation)

Install from PyPI (recommended)

pip install flow-mcp

# Or with uv:
# uv pip install flow-mcp

# Install Playwright browsers
playwright install chromium

# Authenticate with Google Flow
flow-mcp auth login

Or install from GitHub

git clone https://github.com/alarconcesar/flow-mcp.git
cd flow-mcp
uv pip install -e .
playwright install chromium
flow-mcp auth login

Usage with Claude Code

Add to your .claude/settings.json:

{
  "mcpServers": {
    "flow-image-server": {
      "command": "uv",
      "args": ["run", "flow-mcp"]
    }
  }
}

Restart Claude Code. The generate_image tool will be available.

Parameters

Parameter

Type

Default

Description

prompt

string

required

Text description of the image

model

enum

nano-pro

nano2, nano-pro, narwhal, gem_pix_2

count

integer

1

Number of images (1–4)

aspect

enum

9:16

9:16, 16:9, 1:1, 4:3, 3:4

reference_image

string

optional

Path to a local image for I2I

Examples

Text-to-Image:

Generate an image of a cyberpunk city at night, neon lights, 16:9

Image-to-Image:

Take this photo and make it cyberpunk style,
reference_image: /Users/me/photo.jpg

CLI commands

flow-mcp                    # Start MCP server (stdio mode)
flow-mcp auth login         # Authenticate with Google Flow
flow-mcp auth list          # List saved profiles
flow-mcp help               # Show help

Environment variables

Variable

Default

Description

GFLOW_PROFILE

auto-detected

Profile name

GFLOW_CLI_HOME

platform default

gflow-cli data directory

GFLOW_OUTPUT_DIR

temp directory

Where to save generated images

Troubleshooting

Auth expired

flow-mcp auth login

Content filter

Google Flow silently blocks certain prompts (returns None). Try rephrasing — avoid violence, NSFW, or trademarked content.

Linux headless

Xvfb :99 -screen 0 1280x720x24 &   # or let flow-mcp auto-start it
flow-mcp auth login --browser internal

Profile not found

flow-mcp auth list         # list profiles
flow-mcp auth login        # create a new profile

Project structure

flow-mcp/
├── src/
│   └── flow_mcp/
│       ├── __init__.py      # Package metadata & logging config
│       ├── __main__.py      # CLI entry point (auth, server)
│       ├── server.py        # FastMCP tool definition
│       ├── generator.py     # Core generation logic
│       ├── browser.py       # Playwright context & token capture
│       ├── browser_pool.py  # Persistent browser context pool
│       ├── auth.py          # Login, profile list commands
│       ├── profile.py       # Profile resolution
│       ├── recaptcha.py     # reCAPTCHA token minting
│       ├── chrome_helpers.py # Chrome detection
│       └── constants.py     # Shared constants
├── pyproject.toml
├── LICENSE (MIT)
└── README.md

License

MIT — see LICENSE.

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