Placeholder img

Skill MauricioPerera/agent-skills/examples/skills/placeholder-img

Returns a deterministic SVG image with given width, height, and optional background color. Useful for UI mockups, design prototypes, and dummy assets.From its SKILL.md

Install

npx -y skills add MauricioPerera/agent-skills --skill placeholder-img

Assembled from the repository path, not quoted from the project. Check it against their README if it does not work.

One thing to look at

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What its file declares

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The file declares its own license as MIT. That is the author’s claim about this one file, and it is not the same thing as the license GitHub reports for the repository, which is listed with the other numbers below.

SKILL.md

3.7 KB, 313 tokens by cl100k_base, as published. Nobody here has run it

Placeholder Image Generator

Generates SVG placeholder images suitable for UI mockups and design prototypes.

When to use this

Filling image slots in a wireframe or HTML mockup.
Generating consistent dummy images across a design system.
Demonstrating layout behavior without real images.
Any context where you need an image of a specific size but the actual content doesn't matter.

When NOT to use this

Production-facing images where users will see real content.
Image generation for content (use a real generator like DALL-E, SDXL, etc.).
Photography or detailed graphics — output is a flat-colored SVG with text showing the dimensions.

Output

Stdout: a complete SVG image. The text inside the image is auto-styled (light or dark) based on the background's luminance for readability.

Cache: responses are cached one year (Cache-Control: public, max-age=31536000, immutable) — the same URL always yields the same SVG. Safe to use in loops or batch generation.

Caveats

Maximum dimensions: 4000 × 4000 (per the regex constraint on dimensions).
Invalid hex colors silently fall back to cccccc (light gray).
No authentication, no rate limiting beyond Cloudflare defaults.
The --data-urlencode bg=... form puts the bg parameter on the query string after ? while still being a single shell argument — this is the correct way to combine GET request data with curl --get.

What ships with it

Read from the repository

Just SKILL.md. No reference files, no scripts.