Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add sablier-labs/agent-skills --skill spec-from-screenshotgit clone --depth 1 https://github.com/sablier-labs/agent-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/sablier-labs/agent-skills/spec-from-screenshot)<a href="https://agentmods.dev/skills/sablier-labs/agent-skills/spec-from-screenshot"><img src="https://agentmods.dev/badge/skills/sablier-labs/agent-skills/spec-from-screenshot/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/sablier-labs/agent-skills/spec-from-screenshot"><img src="https://agentmods.dev/badge/skills/sablier-labs/agent-skills/spec-from-screenshot.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00053 | $0.01085 |
| Opus 5 | $0.00026 | $0.00543 |
| Sonnet 5 | $0.00011 | $0.00217 |
| Haiku 4.5 | $0.00005 | $0.00109 |
Grade A, and why
spec-from-screenshot scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 11d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 195 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Screenshot Analysis & Spec Generation
Analyze website screenshots and generate detailed implementation specifications. This skill guides creation of
comprehensive SPEC.md files that document design systems extracted from visual references.
When to Use
- User provides website screenshots or design mockups
- Request for implementation specifications from visual references
- Need to extract design systems (colors, typography, spacing) from images
- Creating detailed component inventories from UI screenshots
Workflow
Step 1: Validate Prerequisites
Ensure screenshots are available in the conversation. If no images are present, request them before proceeding.
Step 2: Perform Ultra-Detailed Analysis
Analyze all provided screenshots covering these aspects:
1. Layout Architecture
- Overall page structure (header, navigation, hero, main content, sidebars, footer)
- Grid system and column layouts
- Container widths and max-widths
- Section hierarchy and nesting
2. Typography System
- Font families (identify primary, secondary, monospace)
- Font sizes for each text level (h1-h6, body, small, etc.)
- Font weights used (light, regular, medium, semibold, bold)
- Line heights and letter spacing
- Text colors and contrast ratios
3. Color Palette
- Primary brand colors
- Secondary/accent colors
- Background colors (main, sections, cards)
- Text colors (headings, body, muted, links)
- Border colors
- State colors (success, error, warning, info)
- Color codes in hex/rgb (best approximation)
4. Spacing System
- Margins between major sections
- Padding within components
- Gap spacing in flex/grid layouts
- Consistent spacing scale (e.g., 4px, 8px, 16px, 24px, 32px)
- Vertical rhythm patterns
5. Component Inventory
- Buttons (styles, sizes, states)
- Input fields and forms
- Cards and containers
- Navigation elements
- Icons and their style
- Badges, tags, labels
- Modals, tooltips, dropdowns
- List items and data tables
6. Visual Design Details
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 11d ago First seen · 195 lines · 53 tokens per session scan A ab1d8a051393
spec-from-screenshot is a skill published in the GitHub repository sablier-labs/agent-skills (9 stars, last pushed 1mo ago), licensed MIT. It adds 53 tokens to every session and 1,085 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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