Make Portfolio Blog Cover
Create, regenerate, or validate raster cover thumbnails for rubenmarcus.dev blog posts. Use when an article needs a cover, an existing thumbnail must be brought into the site's black-and-phosphor-green particle system, a cover motif must be added to scripts/gen-blog-covers.mjs, or blog image dimensions and visual consistency need QA.
Install
$ agentstack add skill-rubenmarcus-portfolio-make-portfolio-blog-cover ✓ scanned · ✓ verified, works with Claude Code, Cursor, and more.
Security review
✓ PassedNo issues found. Passed automated security review. · v0.1.0 How review works →
- ✓ Prompt-injection patterns
- ✓ Secret / credential exfiltration
- ✓ Dangerous shell & filesystem operations
- ✓ Untrusted network calls
- ✓ Known-malicious package signatures
What it can access
- ✓ Network access No
- ✓ Filesystem access No
- ✓ Shell / process execution No
- ✓ Environment & secrets No
- ✓ Dynamic code execution No
From automated source analysis of v0.1.0. “Used” means the capability is present in the source — more access means more to trust, not that it’s unsafe.
Verified badge
Passed review? Show it. Paste this badge into your README, it links to the public security report.
Links to your public security report.[](https://agentstack.voostack.com/security/report/skill-rubenmarcus-portfolio-make-portfolio-blog-cover) Reliability & compatibility
Declared compatibility
Compatibility is declared by the source manifest. End-to-end runtime verification is coming, see below.
We're building live execution health for every listing: tool-call success rate, median latency, uptime, and last-checked timestamps, measured, not self-reported. It isn't live yet, so we don't show numbers we can't stand behind.
How agent discovery & health will work →About
Make Portfolio Blog Cover
Turn an article's central idea into one readable particle motif that matches the existing portfolio thumbnails.
Workflow
- Read
references/visual-system.mdcompletely. - Inspect at least four recent covers in
public/art/blog/, including one visually related article. Do not infer the style from filenames alone. - Reduce the article to one motif that remains recognizable at card size. Avoid literal paragraphs, UI text, brand marks, and a collage of concepts.
- Add the slug and motif to
COVERSinscripts/gen-blog-covers.mjsso the art direction remains reproducible. - Use the available raster image-generation capability. For ImageGen, generate one distinct asset per article and use inspected covers only as style references.
- Save the selected final at
public/art/blog/.png. Never leave a project-referenced image only in a tool cache or temporary directory. - Inspect the saved file at original detail. Verify motif, palette, negative space, absence of text, and similarity to the thumbnail family.
- Verify a 1024x1024 PNG with RGB or RGBA color. Check that the corners are effectively black and that no unintended color family dominates.
- Confirm that both language versions reference the same
/art/blog/.pngpath.
Prompt construction
Start from the shared style below, then add one MOTIF: sentence from the article:
A dense luminous swarm of tiny phosphor-green (#00ff41) particles, sparks and hairline light trails on a pure black background, forming one central motif. Organic depth, soft phosphor bloom, subtle dot-matrix grain, cinematic contrast, square composition with generous black margins. Strictly no text, letters, logos, people, solid fills, frames, borders, or other colors. Dark analog occult-techno mood.Do not request title text inside the bitmap. The site renders article titles separately.
Completion gate
Finish only when the motif is registered, the PNG is saved in the project, visual inspection passes, technical checks pass, and both articles use the same cover path.
Source & license
This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.
- Author: rubenmarcus
- Source: rubenmarcus/portfolio
- License: MIT
- Homepage: https://www.rubenmarcus.dev
Install and usage instructions live in the source repository linked above.
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Versions
- v0.1.0 Imported from the upstream source.