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image-understand

Analyze static images to extract descriptions, text, objects, and alt text.

2|Updated Mar 31, 2026
Search Tags:#ocr#image-analysis#object-detection#image-classification#z-ai-web-dev-sdk#alt-text
One-click install
npx skills add https://github.com/marktantongco/promptc-os --skill image-understand-marktantongco
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: image-understand
Source: https://github.com/marktantongco/promptc-os/tree/main/skills/image-understand
Command: npx skills add https://github.com/marktantongco/promptc-os --skill image-understand-marktantongco

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill requires z-ai-web-dev-sdk, and includes scripts (resource) components.

What problem does it solve?

This Skill eliminates manual visual analysis by letting developers and product teams automatically extract image descriptions, detect and count objects, perform OCR, classify images, and generate accessible alt text from static image files.

Core Features & Use Cases

  • Image description & scene understanding: Produce human-readable summaries of scene, setting, lighting, and mood.
  • OCR & text extraction: Pull text from receipts, business cards, forms, and documents while optionally preserving layout.
  • Object detection & counting: Identify, locate, and count objects or people with optional reasoning for complex cases.
  • Classification, tagging & quality assessment: Auto-tag images, produce structured JSON outputs, and rate technical quality for e-commerce or cataloging.
  • Accessibility: Generate concise alt text optimized for screen readers and web use.
  • Integration patterns: Works in backend services, CLI workflows, batch processors, and Next.js / Express endpoints for production use.

Quick Start

Analyze the image at https://example.com/photo.jpg and return a detailed scene description, a list of detected objects with counts, and a concise alt text suitable for screen readers.

Frequently Asked Questions about image-understand

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I extract text and generate alt text from images in a Node.js backend?▼

Object detection and image classification are performed by applying the z-ai-web-dev-sdk to static image files. The Skill identifies, locates, and counts objects or people, producing structured JSON outputs that can optionally include reasoning for complex cases.

Can I use z-ai-web-dev-sdk to analyze PNG, JPEG, and WebP images for batch processing?▼

Yes, the z-ai-web-dev-sdk supports an optional thinking mode for complex reasoning during image analysis. This mode is useful for generating detailed scene descriptions, understanding lighting and mood, and handling intricate object detection cases.

Does this image analysis approach work with Next.js and Express endpoints?▼

Streaming outputs from image analysis are formatted as JSON for downstream consumption. The Skill processes static images to extract descriptions, text, and objects, returning structured data that can be directly consumed by CLI workflows or backend services.

What's the best way to automate OCR and image tagging for e-commerce catalogs?▼

The primary limitation is that it processes only static image files, meaning animated GIFs are treated as static images. It operates backend-only with the z-ai-web-dev-sdk, so it requires server-side integration and cannot run purely in a browser environment.

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