Borrowing it
Nothing to install: this file belongs to heidihelena/vahtian. 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/heidihelena/vahtian/main/.claude/skills/run-vahtian/SKILL.mdgit clone --depth 1 https://github.com/heidihelena/vahtianWrote 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/heidihelena/vahtian/run-vahtian)<a href="https://agentmods.dev/skills/heidihelena/vahtian/run-vahtian"><img src="https://agentmods.dev/badge/skills/heidihelena/vahtian/run-vahtian/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/heidihelena/vahtian/run-vahtian"><img src="https://agentmods.dev/badge/skills/heidihelena/vahtian/run-vahtian.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 | $0.00130 | $0.01702 |
| Opus 5 | $0.00065 | $0.00851 |
| Sonnet 5 | $0.00026 | $0.00340 |
| Haiku 4.5 | $0.00013 | $0.00170 |
Grade B, and why
run-vahtian scanned grade B with 1 finding 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 12d 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.
Enumerates other installed skillsmediumAgent snooping
Other skills' SKILL.md files reveal prompts, capabilities and secrets that should be invisible to peers.
- `Cannot find Playwright` → run `cd .claude/skills/run-vahtian && npm install How it starts
The opening of the file, as written. The whole thing — 127 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Run Vahtian
Vahtian's site is plain static HTML — one index.html per product, deployed
via Cloudflare (wrangler.jsonc: assets.directory = "."). There is no build
step, no framework, no bundler, no trackers. You don't "start" it so much as
serve the directory.
The agent path is the driver: .claude/skills/run-vahtian/driver.mjs. It starts
a tiny static server that resolves clean URLs the way Cloudflare does
(/studyvahti → /studyvahti/index.html, unknown → 404.html), then drives it
with Playwright's bundled headless Chromium and writes desktop + mobile
screenshots. Use it whenever you need to see the rendered page — every UX or
copy change should be looked at, not inferred from HTML source.
All paths below are relative to the repo root (
<unit>/= thevahtian/repo).
Prerequisites
- Node (any recent version; the container pins 22 via
.node-version, Heidi's Mac runs 20 — both work). - Playwright. The driver resolves it from the first place it exists:
- the skill's own
node_modules(macOS path — installed once withcd .claude/skills/run-vahtian && npm install; gitignored), - the container's global install at
/opt/node22/lib/node_modules/playwright.
- the skill's own
First-time setup on a new machine:
cd .claude/skills/run-vahtian && npm install playwright
Browser binaries live in a separate cache (~/Library/Caches/ms-playwright on
macOS) and are usually already there; if launch fails with
Executable doesn't exist, run npx playwright install chromium (this one is
a large download — avoid on slow connections unless needed).
Run (agent path) — the driver
# Screenshot the default set (home + the four live product pages),
# desktop (1280×900) and mobile (390×844):
node .claude/skills/run-vahtian/driver.mjs
# Screenshot specific paths only:
node .claude/skills/run-vahtian/driver.mjs / /studyvahti /reviewvahti
# Status check only (serve + assert every path returns 200, no browser):
node .claude/skills/run-vahtian/driver.mjs --check / /studyvahti /llms.txt
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.
- 12d ago First seen · 127 lines · 130 tokens per session scan B 838e3a16695b
run-vahtian is a skill published in the GitHub repository heidihelena/vahtian (1 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 130 tokens to every session and 1,702 once invoked, about $0.0006 per session on Opus 5. A static security scan graded it B with 1 finding (enumerates other installed skills). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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