Borrowing it
Nothing to install: this file belongs to the-sid-dani/second-brain-os. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/the-sid-dani/second-brain-os/main/.agents/skills/use-design/SKILL.mdgit clone --depth 1 https://github.com/the-sid-dani/second-brain-osWrote 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/the-sid-dani/second-brain-os/use-design)<a href="https://agentmods.dev/skills/the-sid-dani/second-brain-os/use-design"><img src="https://agentmods.dev/badge/skills/the-sid-dani/second-brain-os/use-design/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/the-sid-dani/second-brain-os/use-design"><img src="https://agentmods.dev/badge/skills/the-sid-dani/second-brain-os/use-design.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 | $0.00098 | $0.00555 |
| Opus 5.5 | $0.00039 | $0.00222 |
| Sonnet 5.5 | $0.00020 | $0.00111 |
| Haiku 4.5 | $0.00010 | $0.00056 |
Grade A, and why
use-design 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 1mo 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.
What it actually says
use-design — swap the active design system
The design-* skills read ./DESIGN.md at the workspace root for their tokens (palette, typography, layout rules). This skill swaps that file for a different brand from the design-system catalog.
Resolve <workspace.root> and <workspace.resources> from the Configuration section in root CLAUDE.md before using any path below.
Steps
-
Resolve the brand argument. The invocation is
/use-design <brand>(e.g./use-design stripe). If no brand is given, or the brand doesn't match a folder, list what's available and stop:ls <workspace.root>/<workspace.resources>/design-systems/Match case-insensitively and accept close variants (
linear→linear-app). If the match is ambiguous, show the candidates and ask. -
Verify the source exists at
<workspace.root>/<workspace.resources>/design-systems/<brand>/DESIGN.md. If the folder exists but has noDESIGN.md, say so — don't invent tokens. -
Preserve the current root
DESIGN.mdif it has been customized: before overwriting, check whether rootDESIGN.mddiffers from every catalog brand. If it matches a catalog brand, it's safe to overwrite (the catalog still has it). If it matches nothing, it's custom — copy it to<workspace.root>/<workspace.resources>/design-systems/custom-<YYYY-MM-DD>/DESIGN.mdfirst and tell the user. -
Copy the brand file to the workspace root:
cp <workspace.root>/<workspace.resources>/design-systems/<brand>/DESIGN.md ./DESIGN.md -
Confirm in one line: which brand is now active, and remind that all design-* skills pick it up on their next invocation.
Boundaries
- Never edit the catalog files under
design-systems/— they're the library; only rootDESIGN.mdchanges. - This skill swaps tokens only. It does not restyle existing artifacts — re-run the relevant design-* skill to regenerate them under the new brand.
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.
- 1mo ago First seen · 38 lines · 98 tokens per session scan A ea671fa8d57b
use-design is a skill published in the GitHub repository the-sid-dani/second-brain-os (3 stars, last pushed 7d ago), licensed MIT. It adds 98 tokens to every session and 555 once invoked, about $0.0004 per session on Opus 5.5. 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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