Auto Free Banana

Generates images in Google Flow (labs.google/fx) through browser UI automation. Supports Nano Banana 2 and Nano Banana Pro with landscape/portrait aspect ratios. Use when the user requests Flow-based image generation.

Google Flow UI Client

Generate images in Google Flow through Chrome CDP + browser UI automation.

Important constraints:

• Project creation is UI-only
• Prompt submission is UI-only
• Do not use or describe any API-based project creation path
• Images are considered complete once the base images are visible in the browser

Script Directory

Resolve:

1. {baseDir} = directory containing this SKILL.md
2. Script path = {baseDir}/scripts/main.ts
3. ${BUN_X} = bun if installed, else npx -y bun

Consent Check (REQUIRED)

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

Consent file locations:

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

Flow:

1. Check if consent file exists with accepted: true and disclaimerVersion: "1.0"
2. If valid consent exists → print warning with acceptedAt date, proceed
3. 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
4. Consent file format: {"version":1,"accepted":true,"acceptedAt":"<ISO>","disclaimerVersion":"1.0"}

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Preferences (EXTEND.md)

Check EXTEND.md existence (priority order):

bash

test -f .baoyu-skills/auto-free-banana/EXTEND.md && echo "project"
test -f "${XDG_CONFIG_HOME:-$HOME/.config}/baoyu-skills/auto-free-banana/EXTEND.md" && echo "xdg"
test -f "$HOME/.baoyu-skills/auto-free-banana/EXTEND.md" && echo "user"

EXTEND.md Supports: Default model | Default aspect ratio | Custom data directory

Execution Envelope (REQUIRED)

Before any pre-flight check or main.ts invocation, decide one shell environment and reuse it for every command in the run.

• Use the same PATH
• Use the same proxy variables
• Use the same CDP / Chrome profile variables

If you set any of these once, keep them identical for all later commands in the turn:

• PATH
• FLOW_WEB_PROXY
• HTTPS_PROXY / HTTP_PROXY
• AGENT_BROWSER_CHROME_PROXY_SERVER
• FLOW_WEB_DEBUG_PORT / AGENT_BROWSER_CDP_PORT
• FLOW_WEB_COOKIE_PATH
• FLOW_WEB_CHROME_PROFILE_DIR
• AGENT_BROWSER_USER_DATA_DIR_WIN
• AGENT_BROWSER_CMD_EXE_WSL

Never run pre-flight checks in one environment and main.ts in another.

Preferred proxy setup:

bash

export FLOW_WEB_PROXY=http://host:port
export HTTPS_PROXY="$FLOW_WEB_PROXY"
export HTTP_PROXY="$FLOW_WEB_PROXY"
export AGENT_BROWSER_CHROME_PROXY_SERVER="$FLOW_WEB_PROXY"

Usage

Before running any generation command, complete the Pre-flight Checks below.

bash

# Default generation: creates a NEW Flow project through the UI
${BUN_X} {baseDir}/scripts/main.ts --prompt "A cute cat"

# Specify model + portrait + 2 images
${BUN_X} {baseDir}/scripts/main.ts --prompt "A sunset" --model NANO_BANANA_PRO --aspect 9:16 --count 2

# Reuse an EXISTING Flow project only when you already have the project id
${BUN_X} {baseDir}/scripts/main.ts --project-id <project-id> --prompt "A sunset"

# Authentication only
${BUN_X} {baseDir}/scripts/main.ts --login

# Batch mode: multiple prompts in one project (5s interval)
${BUN_X} {baseDir}/scripts/main.ts --prompt "A cute cat" --prompt "A sunset" --prompt "A mountain landscape"

Batch mode rules:

• Use one command with repeated --prompt
• The first prompt creates a new project through the UI unless --project-id is supplied
• Later prompts reuse that same project
• Do not run multiple separate main.ts commands for a multi-prompt batch

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Pre-flight Checks

Run these checks in order. Each step must pass before moving to the next.

Step 1: Runtime Prerequisites (BLOCKING)

Check the Bun runtime and Python:

bash

command -v bun >/dev/null && echo "BUN" || command -v npx >/dev/null && echo "NPX_BUN" || echo "MISSING"
command -v python3 >/dev/null && echo "OK" || echo "MISSING"

If any required command is missing, stop.

If running under WSL, also verify the Windows bridge and Chrome path assumptions:

bash

test -x /mnt/c/Windows/System32/cmd.exe && echo "OK" || echo "MISSING"
test -f "/mnt/c/Program Files/Google/Chrome/Application/chrome.exe" && echo "OK" || echo "MISSING"

If not running under WSL, ensure FLOW_WEB_CHROME_PATH is set before continuing.

Step 2: Browser Profile Check (AUTO-RESOLVE)

Check if the Chrome debug user data directory exists. Default WSL-visible path:

• /mnt/c/chrome-debug-openclaw
• env override: AGENT_BROWSER_USER_DATA_DIR_WIN

bash

test -d /mnt/c/chrome-debug-openclaw && echo "EXISTS" || echo "NEW"

• EXISTS → proceed
• NEW → proceed, but tell the user a fresh browser profile will be created

Step 3: Network Connectivity Check (WARN + WAIT)

Test Google reachability using the same environment you will use for main.ts:

bash

curl -sS --connect-timeout 5 -o /dev/null -w '%{http_code}' https://labs.google/fx/ 2>/dev/null || echo "FAIL"

• 200/301/302 → proceed
• FAIL / timeout → stop and fix proxy settings first

Do not continue into main.ts while shell networking and browser proxy settings disagree.

Step 4: Login State Check (WARN + GUIDE)

Check if cached credentials exist:

Linux default cookie file:

• ~/.local/share/baoyu-skills/flow-web/cookies.json

bash

test -f ~/.local/share/baoyu-skills/flow-web/cookies.json && echo "EXISTS" || echo "NONE"

• EXISTS → proceed
• NONE → run:

  bash

  ${BUN_X} {baseDir}/scripts/main.ts --login --verbose
  

  Then wait for the user to finish Google login in the browser.

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Generation Rules

The skill supports exactly two generation entry modes:

• New project: omit --project-id; the script creates a project through the Flow UI
• Existing project: provide --project-id

Do not invent any third path.

Explicitly forbidden:

• API-based project creation
• Describing API project creation as a fallback
• Mixing one failed path with a different project-creation mechanism mid-run

If automatic UI project creation fails:

1. Inspect the Flow listing page in the browser
2. Fix the UI state only
3. Retry the same UI path
4. If needed, manually click 新建项目 in the browser, capture the resulting project id from the URL, then rerun main.ts with --project-id <id>

The fallback is still UI-only.

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Task Completion (IMPORTANT)

main.ts only automates the UI. It fills the prompt, clicks Create, then exits immediately. Actual image generation continues asynchronously in the browser.

After main.ts exits with code 0:

1. The script has successfully submitted all prompts. Images are now generating in the browser.
2. You MUST verify generation completion by taking a browser screenshot (via CDP or screenshot tool) and visually checking whether images have appeared on the page.
3. If the screenshot shows images are still loading (spinner, progress indicator, blank placeholders), wait 10-15 seconds and take another screenshot.
4. Repeat until all images are visible, or until 2 minutes have passed (then report a timeout).
5. Once the base images are confirmed visible, stop and report completion.
6. Do NOT download, fetch, curl, or render any URLs. Images are visible in the browser.

Important completion rule:

• If the images are visible and Flow still shows optional HD-enhancement / download / post-processing toasts, treat the task as complete anyway.

If the script exits with a non-zero code, report the error and stop.

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Options

Option	Description
--prompt, -p	Prompt text (repeat for batch mode)
--model, -m	Model ID (see Models table)
--aspect, -a	Aspect ratio: 16:9 (default), 9:16
--count	Number of images: 1-4 (default: 2)
--project-id	Reuse existing project
--verbose	Enable debug logging
--login	Authenticate and save cookies, then exit
--cookie-path	Custom cookie file path
--profile-dir	Chrome profile directory

Models

Model	Description
NARWHAL	Nano Banana 2 (default, fast)
NANO_BANANA_PRO	Nano Banana Pro

Optional Verification Helper

If /home/admin1/.openclaw/workspace/scripts/agent-browser-cdp.sh exists, it is a convenient helper for screenshots and browser inspection after generation:

bash

bash /home/admin1/.openclaw/workspace/scripts/agent-browser-cdp.sh --full screenshot /tmp/flow.png
bash /home/admin1/.openclaw/workspace/scripts/agent-browser-cdp.sh snapshot -c

This helper is optional. Generation must not depend on agent-browser being installed.

Environment Variables

Variable	Description
FLOW_WEB_PROXY	Preferred proxy for shell/API requests
HTTPS_PROXY / HTTP_PROXY	Standard proxy env vars
FLOW_WEB_DATA_DIR	Data directory
FLOW_WEB_COOKIE_PATH	Cookie file path
FLOW_WEB_CHROME_PROFILE_DIR	Local Chrome user data dir when not on WSL
FLOW_WEB_CHROME_PATH	Chrome executable path for non-WSL environments
FLOW_WEB_DEBUG_PORT	Fixed Chrome debug port
FLOW_WEB_CHROME_EXE_WIN	Windows Chrome path override when running from WSL
FLOW_WEB_CHROME_USER_DATA_DIR_WIN	Windows Chrome user data dir override when running from WSL
FLOW_WEB_CHROME_EXTRA_ARGS	Extra Chrome args
AGENT_BROWSER_CHROME_PROXY_SERVER	Browser proxy used by host Chrome
AGENT_BROWSER_USER_DATA_DIR_WIN	Windows-side Chrome debug profile override
AGENT_BROWSER_CMD_EXE_WSL	WSL path to cmd.exe
BAOYU_CHROME_PROFILE_DIR	Shared Chrome profile override