Gemini Web Client Skill

Gemini Web Client

Text/image generation via Gemini Web API. Supports reference images and multi-turn conversations.

Script Directory

Important: All scripts are located in the scripts/ subdirectory of this skill.

Agent Execution Instructions:

Determine this SKILL.md file's directory path as SKILL_DIR
Script path = ${SKILL_DIR}/scripts/<script-name>.ts
Replace all ${SKILL_DIR} in this document with the actual path

Script Reference: | Script | Purpose | |--------|---------| | scripts/main.ts | CLI entry point for text/image generation | | scripts/gemini-webapi/* | TypeScript port of gemini_webapi (GeminiClient, types, utils) |

Consent Check (REQUIRED)

Before first use, verify user consent for reverse-engineered API usage.

Consent file locations:

macOS: ~/Library/Application Support/baoyu-skills/gemini-web/consent.json
Linux: ~/.local/share/baoyu-skills/gemini-web/consent.json
Windows: %APPDATA%\baoyu-skills\gemini-web\consent.json

Flow:

Check if consent file exists with accepted: true and disclaimerVersion: "1.0"
If valid consent exists → print warning with acceptedAt date, proceed
If no consent → show disclaimer, ask user via AskUserQuestion:
- "Yes, I accept" → create consent file with ISO timestamp, proceed
- "No, I decline" → output decline message, stop
Consent file format: {"version":1,"accepted":true,"acceptedAt":"<ISO>","disclaimerVersion":"1.0"}

Preferences (EXTEND.md)

Use Bash to check EXTEND.md existence (priority order):

# Check project-level first
test -f .baoyu-skills/baoyu-danger-gemini-web/EXTEND.md && echo "project"

# Then user-level (cross-platform: $HOME works on macOS/Linux/WSL)
test -f "$HOME/.baoyu-skills/baoyu-danger-gemini-web/EXTEND.md" && echo "user"

┌──────────────────────────────────────────────────────────┬───────────────────┐ │ Path │ Location │ ├──────────────────────────────────────────────────────────┼───────────────────┤ │ .baoyu-skills/baoyu-danger-gemini-web/EXTEND.md │ Project directory │ ├──────────────────────────────────────────────────────────┼───────────────────┤ │ $HOME/.baoyu-skills/baoyu-danger-gemini-web/EXTEND.md │ User home │ └──────────────────────────────────────────────────────────┴───────────────────┘

┌───────────┬───────────────────────────────────────────────────────────────────────────┐ │ Result │ Action │ ├───────────┼───────────────────────────────────────────────────────────────────────────┤ │ Found │ Read, parse, apply settings │ ├───────────┼───────────────────────────────────────────────────────────────────────────┤ │ Not found │ Use defaults │ └───────────┴───────────────────────────────────────────────────────────────────────────┘

EXTEND.md Supports: Default model | Proxy settings | Custom data directory

Usage

# Text generation
npx -y bun ${SKILL_DIR}/scripts/main.ts "Your prompt"
npx -y bun ${SKILL_DIR}/scripts/main.ts --prompt "Your prompt" --model gemini-2.5-pro

# Image generation
npx -y bun ${SKILL_DIR}/scripts/main.ts --prompt "A cute cat" --image cat.png
npx -y bun ${SKILL_DIR}/scripts/main.ts --promptfiles system.md content.md --image out.png

# Vision input (reference images)
npx -y bun ${SKILL_DIR}/scripts/main.ts --prompt "Describe this" --reference image.png
npx -y bun ${SKILL_DIR}/scripts/main.ts --prompt "Create variation" --reference a.png --image out.png

# Multi-turn conversation
npx -y bun ${SKILL_DIR}/scripts/main.ts "Remember: 42" --sessionId session-abc
npx -y bun ${SKILL_DIR}/scripts/main.ts "What number?" --sessionId session-abc

# JSON output
npx -y bun ${SKILL_DIR}/scripts/main.ts "Hello" --json

Options

| Option | Description | |--------|-------------| | --prompt, -p | Prompt text | | --promptfiles | Read prompt from files (concatenated) | | --model, -m | Model: gemini-3-pro (default), gemini-2.5-pro, gemini-2.5-flash | | --image [path] | Generate image (default: generated.png) | | --reference, --ref | Reference images for vision input | | --sessionId | Session ID for multi-turn conversation | | --list-sessions | List saved sessions | | --json | Output as JSON | | --login | Refresh cookies, then exit | | --cookie-path | Custom cookie file path | | --profile-dir | Chrome profile directory |

Models

| Model | Description | |-------|-------------| | gemini-3-pro | Default, latest | | gemini-2.5-pro | Previous pro | | gemini-2.5-flash | Fast, lightweight |

Authentication

First run opens browser for Google auth. Cookies cached automatically.

Supported browsers (auto-detected): Chrome, Chrome Canary/Beta, Chromium, Edge.

Force refresh: --login flag. Override browser: GEMINI_WEB_CHROME_PATH env var.

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 | | HTTP_PROXY, HTTPS_PROXY | Proxy for Google access (set inline with command) |

Sessions

Session files stored in data directory under sessions/<id>.json.

Contains: id, metadata (Gemini chat state), messages array, timestamps.

Extension Support

Custom configurations via EXTEND.md. See Preferences section for paths and supported options.

Agent Skills: Gemini Web Client

Install this agent skill to your local

Skill Files