Designing Systems
Phase 1: Browse 4 catalog sites via fuse-browser, write CSS-precise observations (oklch values, font-size clamp, grid ratios, border-radius, shadows), declare reference site + 3 elements. Feed specs to Gemini context.
Install
$ agentstack add skill-fusengine-agents-1-designing-systems ✓ 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-fusengine-agents-1-designing-systems) 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
Phase 1: RESEARCH — Browse, observe, extract CSS specs
When
After Phase 0 identity templates are read. Before writing design-system.md.
Input (from Phase 0)
- Sector identified (creative/fintech/ecommerce/devtool/health)
- Typography pair chosen, OKLCH palette direction known
Steps
- Read inspiration catalog —
references/design-inspiration.md+references/design-inspiration-urls.md - Pick 4 URLs from catalog matching the project sector (MUST be from KNOWN_DOMAINS)
- Browse each site via fuse-browser (open one session, reuse for all 4):
browser_open→ sessionId (once)browser_navigate→ URLbrowser_scroll→to: "end"(loads lazy content)- Wait 5s →
browser_scrolldeltaY: -100000(back to top) → wait 2s browser_screenshotfullPage: true
- Write 5 CSS-precise observations per screenshot (NOT vague descriptions):
- (1) Colors: exact oklch() values for primary, accent, background, text
- (2) Typography: font-family name, font-size as clamp(min, preferred, max), font-weight
- (3) Layout: grid/flex structure with column ratios (60/40, 1fr/1fr), gap in px
- (4) Effects: border-radius in px, box-shadow values, backdrop-blur, opacity
- (5) Spacing: section padding in px, margin between elements, max-width
- Declare reference — "Site choisi: {URL}. Je reproduis: {el1}, {el2}, {el3}"
Pick 3 visually distinctive elements with their CSS specs.
Output
- 4 fullPage screenshots taken (state: screenshots_count >= 4)
- 20 CSS-precise observations (5 per site)
- 1 reference site declared with 3 elements to reproduce
- Ready to write design-system.md (Phase 2)
Next → Phase 2: UX COPY
2-ux-copy/SKILL.md — Define voice, tone, and microcopy patterns.
References
| File | Purpose | |------|---------| | references/design-inspiration.md | Browsing methodology and observation format | | references/design-inspiration-urls.md | Catalog of sector-matched inspiration URLs | | references/color-system.md | OKLCH palette generation | | references/typography.md | Font scale and pairings | | references/ui-hierarchy.md | Visual hierarchy patterns | | references/ui-spacing.md | Spacing systems |
Source & license
This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.
- Author: fusengine
- Source: fusengine/agents
- License: MIT
Install and usage instructions live in the source repository linked above.
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Versions
- v0.1.0 Imported from the upstream source.