Gemini Web Client

Supports:

• Text generation
• Image generation (download + save)
• Reference image upload (attach images for vision tasks)
• Multi-turn conversations within the same executor instance (keepSession)
• Experimental video generation (generateVideo) — Gemini may return an async placeholder; download might require Gemini web UI

Quick start

npx -y bun scripts/main.ts "Hello, Gemini"
npx -y bun scripts/main.ts --prompt "Explain quantum computing"
npx -y bun scripts/main.ts --prompt "A cute cat" --image cat.png
npx -y bun scripts/main.ts --promptfiles system.md content.md --image out.png

# Multi-turn conversation (agent generates unique sessionId)
npx -y bun scripts/main.ts "Remember this: 42" --sessionId my-unique-id-123
npx -y bun scripts/main.ts "What number?" --sessionId my-unique-id-123

Executor options (programmatic)

This skill is typically consumed via createGeminiWebExecutor(geminiOptions) (see scripts/executor.ts).

Key options in GeminiWebOptions:

• referenceImages?: string | string[] Upload local images as references (vision input).
• keepSession?: boolean Reuse Gemini chatMetadata to continue the same conversation across calls (required if you want reference images to persist across multiple messages).
• generateVideo?: string Generate a video and (best-effort) download to the given path. Gemini may return video_gen_chip (async); in that case you must open Gemini web UI to download the result.

Notes:

• generateVideo cannot be combined with generateImage / editImage.
• When keepSession=true and referenceImages is set, reference images are uploaded once per executor instance.

Commands

Text generation

# Simple prompt (positional)
npx -y bun scripts/main.ts "Your prompt here"

# Explicit prompt flag
npx -y bun scripts/main.ts --prompt "Your prompt here"
npx -y bun scripts/main.ts -p "Your prompt here"

# With model selection
npx -y bun scripts/main.ts -p "Hello" -m gemini-2.5-pro

# Pipe from stdin
echo "Summarize this" | npx -y bun scripts/main.ts

Image generation

# Generate image with default path (./generated.png)
npx -y bun scripts/main.ts --prompt "A sunset over mountains" --image

# Generate image with custom path
npx -y bun scripts/main.ts --prompt "A cute robot" --image robot.png

# Shorthand
npx -y bun scripts/main.ts "A dragon" --image=dragon.png

Output formats

# Plain text (default)
npx -y bun scripts/main.ts "Hello"

# JSON output
npx -y bun scripts/main.ts "Hello" --json

Options

Option	Description
--prompt <text>, -p	Prompt text
--promptfiles <files...>	Read prompt from files (concatenated in order)
--model <id>, -m	Model: gemini-3-pro (default), gemini-2.5-pro, gemini-2.5-flash
--image [path]	Generate image, save to path (default: generated.png)
--sessionId <id>	Session ID for multi-turn conversation (agent generates unique ID)
--list-sessions	List saved sessions (max 100, sorted by update time)
--json	Output as JSON
--login	Refresh cookies only, then exit
--cookie-path <path>	Custom cookie file path
--profile-dir <path>	Chrome profile directory
--help, -h	Show help

CLI note: scripts/main.ts supports text generation, image generation, and multi-turn conversations via --sessionId. Reference images and video generation are exposed via the executor API.

Models

• gemini-3-pro - Default, latest model
• gemini-2.5-pro - Previous generation pro
• gemini-2.5-flash - Fast, lightweight

Authentication

First run opens Chrome to authenticate with Google. Cookies are cached for subsequent runs.

# Force cookie refresh
npx -y bun scripts/main.ts --login

Environment variables

Variable	Description
GEMINI_WEB_DATA_DIR	Data directory
GEMINI_WEB_COOKIE_PATH	Cookie file path
GEMINI_WEB_CHROME_PROFILE_DIR	Chrome profile directory
GEMINI_WEB_CHROME_PATH	Chrome executable path

Examples

Generate text response

npx -y bun scripts/main.ts "What is the capital of France?"

Generate image

npx -y bun scripts/main.ts "A photorealistic image of a golden retriever puppy" --image puppy.png

Get JSON output for parsing

npx -y bun scripts/main.ts "Hello" --json | jq '.text'

Generate image from prompt files

# Concatenate system.md + content.md as prompt
npx -y bun scripts/main.ts --promptfiles system.md content.md --image output.png

Multi-turn conversation

# Start a session with unique ID (agent generates this)
npx -y bun scripts/main.ts "You are a helpful math tutor." --sessionId task-abc123

# Continue the conversation (remembers context)
npx -y bun scripts/main.ts "What is 2+2?" --sessionId task-abc123
npx -y bun scripts/main.ts "Now multiply that by 10" --sessionId task-abc123

# List recent sessions (max 100, sorted by update time)
npx -y bun scripts/main.ts --list-sessions

Session files are stored in ~/Library/Application Support/genimg-skills/gemini-web/sessions/<id>.json and contain:

• id: Session ID
• metadata: Gemini chat metadata for continuation
• messages: Array of {role, content, timestamp, error?}
• createdAt, updatedAt: Timestamps