image-fetcher（图像获取器）

Asset Fetcher

When to use

Use the Asset Fetcher when you need to acquire visual assets for content creation. It supports three acquisition modes: web image search, live website screenshots via Playwright, and organizing user-provided files. All assets are saved to the squad's reference or output folder with descriptive filenames and metadata.

Instructions

Capabilities

1. Web Image Search -- Use the native web_search tool to find images by keyword. Evaluate results and download the best match.
2. Live Screenshot -- Use Playwright MCP to navigate to a URL, set viewport dimensions, and capture a screenshot.
3. Asset Organization -- Save all acquired assets with descriptive filenames in the squad's reference/ or output/ folder.

Screenshot Modes

• viewport -- Capture only the visible viewport area (default)
• full_page -- Capture the entire scrollable page
• selector -- Capture a specific CSS selector element

Screenshot Workflow

When taking a screenshot:

1. Navigate to the URL with browser_navigate
2. Set viewport: browser_resize with width/height for target format

- Instagram post: 1080x1080 - Instagram carousel: 1080x1440 - Story/Reel: 1080x1920 - Generic: 1280x720

1. Wait for page load (browser_wait_for if needed)
2. Capture: browser_take_screenshot
3. Save to reference folder with descriptive filename

Asset Metadata

After acquiring each asset, document in your output:

• path: local file path
• width/height: image dimensions
• source_type: "web_search" | "screenshot" | "user_provided"
• original_url: source URL (if applicable)

Cache Policy

Before fetching an asset:

• Check if the reference folder already has a matching file
• Use deterministic filenames based on source (e.g., URL slug + viewport)
• Reuse existing assets to avoid redundant fetches

Safety

• Timeout: max 30s per screenshot, skip and warn if exceeded
• Maximum screenshot dimensions: 1920x1920px
• Block file:// protocol URLs
• Block localhost and private IP ranges (127.0.0.1, 10.x, 192.168.x)

Best Practices

• Prefer screenshots over web search for product/tool pages (images are often outdated)
• Save with descriptive names: gemini-benchmark-chart.png not image1.png
• Normalize URLs before caching (strip tracking params)
• Document all acquired assets with metadata for downstream tools

Available operations

• Web Image Search -- Find and download images by keyword from the web
• Live Screenshot -- Capture viewport, full-page, or element screenshots of any URL
• Asset Organization -- Save and catalog assets with descriptive filenames and metadata
• Cache Check -- Detect and reuse previously fetched assets to avoid redundant downloads