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/asgeirtj/system_prompts_leaks/storybooknpx skills add asgeirtj/system_prompts_leaks --skill storybookgit clone --depth 1 https://github.com/asgeirtj/system_prompts_leaksWhat 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 | $0.00000 | $0.16334 |
| Opus 5 | $0.00000 | $0.08167 |
| Sonnet 5 | $0.00000 | $0.03267 |
| Haiku 4.5 | $0.00000 | $0.01633 |
Grade A, and why
storybook 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 yesterday.
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:
- storybook — 100% identical, 310 lines differ
How it starts
The opening of the file, as written. The whole thing — 341 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Storybook source shape
Storybook is the fidelity oracle, not the runtime. The converter bundles the package's compiled dist/ into _ds_bundle.js - the same bundle the claude.ai/design agent builds with - and generates each preview by compiling the story source module itself (hooks, fixtures, local helpers - the whole closure comes along), with every component import resolved to that shipped bundle (lib/story-imports.mjs redirects package and relative component imports to window.<Global>). The repo's own storybook render is the ground truth those previews must match: a compare harness screenshots each story in the reference storybook and the matching preview render side by side, and you iterate until they match. Nothing from storybook-static is uploaded, and no story code is ever evaluated at build time - stories run only in the browser, against the real artifact.
Requires React 18+. Playwright + chromium are required for this shape (the compare loop is the verification), not optional.
First sync or re-sync? A re-sync is marked by a config whose projectId and pkg were both in place before this run started - most of this document then doesn't apply; go to §7, where one driver run routes the work and untouched components cost nothing. Everything else takes the full flow (§2 build -> §3 self-heal -> §4 match -> conventions header (base SKILL.md, before upload) -> §6 upload), where every component gets verified and graded once - that includes a partial config left by an aborted run, and a pin this run itself just recorded in the base skill's §1. (Only the old design-sync.config.json present? Move it first and commit: mkdir -p .design-sync && mv -n design-sync.config.json .design-sync/config.json, then apply the same test.)
2. Build, then run the converter
- Build the DS package and its workspace dependencies. The converter bundles
dist/intowindow.<Global>. Run<pm> run build; in a monorepo useturbo run build --filter=<pkg>orpnpm -F "<pkg>..." build(the trailing...is required - bare-F <pkg>skips dependencies and you'll seeCannot find module '@scope/tokens'). Ifpackage.jsonmodule/exports['.']points at TS source, find the actual built entry and pass it via--entry. Do this before step 2 - storybook often imports sibling packages from their builtdist/. - Build the reference storybook ONCE into
.design-sync/sb-reference/- NOT underds-bundle/(the converter wipes--outon every rebuild, and storybook builds take minutes; the reference must survive the fix loop):
What ships with it
3 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- yesterday First seen · 341 lines · 0 tokens per session scan A 25714b54d589
storybook is a skill published in the GitHub repository asgeirtj/system_prompts_leaks (63,837 stars, last pushed 2d ago), licensed CC0-1.0. It costs nothing until one of its globs matches a file; then it loads 16,334 tokens. 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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