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 agentmods add skills/anthropics/knowledge-work-plugins/design-systemnpx skills add anthropics/knowledge-work-plugins --skill design-systemgit clone --depth 1 https://github.com/anthropics/knowledge-work-pluginsWhat 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 | $0.00052 | $0.01316 |
| Opus 5 | $0.00026 | $0.00658 |
| Sonnet 5 | $0.00010 | $0.00263 |
| Haiku 4.5 | $0.00005 | $0.00132 |
Grade A, and why
design-system 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 2d 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.
Copies of this mod
1 near-identical copy found in the catalogue:
- design-system — 100% identical, 0 lines differ
How it starts
The opening of the file, as written. The whole thing — 191 lines — stays where its author put it; the contents beside it link to each section on GitHub.
/design-system
If you see unfamiliar placeholders or need to check which tools are connected, see CONNECTORS.md.
Manage your design system — audit for consistency, document components, or design new patterns.
Usage
/design-system audit # Full system audit
/design-system document [component] # Document a component
/design-system extend [pattern] # Design a new component or pattern
Components of a Design System
Design Tokens
Atomic values that define the visual language:
- Colors (brand, semantic, neutral)
- Typography (scale, weights, line heights)
- Spacing (scale, component padding)
- Borders (radius, width)
- Shadows (elevation levels)
- Motion (durations, easings)
Components
Reusable UI elements with defined:
- Variants (primary, secondary, ghost)
- States (default, hover, active, disabled, loading, error)
- Sizes (sm, md, lg)
- Behavior (interactions, animations)
- Accessibility (ARIA, keyboard)
Patterns
Common UI solutions combining components:
- Forms (input groups, validation, submission)
- Navigation (sidebar, tabs, breadcrumbs)
- Data display (tables, cards, lists)
- Feedback (toasts, modals, inline messages)
Principles
- Consistency over creativity — The system exists so teams don't reinvent the wheel
- Flexibility within constraints — Components should be composable, not rigid
- Document everything — If it's not documented, it doesn't exist
- Version and migrate — Breaking changes need migration paths
Output — Audit
## Design System Audit
### Summary
**Components reviewed:** [X] | **Issues found:** [X] | **Score:** [X/100]
### Naming Consistency
| Issue | Components | Recommendation |
|-------|------------|----------------|
| [Inconsistent naming] | [List] | [Standard to adopt] |
### Token Coverage
| Category | Defined | Hardcoded Values Found |
|----------|---------|----------------------|
| Colors | [X] | [X] instances of hardcoded hex |
| Spacing | [X] | [X] instances of arbitrary values |
| Typography | [X] | [X] instances of custom fonts/sizes |
### Component Completeness
| Component | States | Variants | Docs | Score |
|-----------|--------|----------|------|-------|
| Button | ✅ | ✅ | ⚠️ | 8/10 |
| Input | ✅ | ⚠️ | ❌ | 5/10 |
### Priority Actions
1. [Most impactful improvement]
2. [Second priority]
3. [Third priority]
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.
- 2d ago First seen · 191 lines · 52 tokens per session scan A fb31bd0144c4
design-system is a skill published in the GitHub repository anthropics/knowledge-work-plugins (23,791 stars, last pushed yesterday), licensed Apache-2.0. It adds 52 tokens to every session and 1,316 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 2026-08-30.
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