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/tingly-dev/tingly-box/ui-previewnpx skills add tingly-dev/tingly-box --skill ui-previewgit clone --depth 1 https://github.com/tingly-dev/tingly-boxWhat 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 | $0.00096 | $0.01597 |
| Opus 5 | $0.00048 | $0.00798 |
| Sonnet 5 | $0.00019 | $0.00319 |
| Haiku 4.5 | $0.00010 | $0.00160 |
Grade C, and why
ui-preview scanned grade C with 2 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.
Recursive force deletehighDestructive command
rm -rf with a variable or a broad path is one typo away from removing the wrong tree.
# polluted by npm — wipe it first with `rm -rf node_modules` if you suspect that). Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl -fsSL -o chrome.zip \ How it starts
The opening of the file, as written. The whole thing — 135 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Headless UI preview (Playwright + Chrome for Testing)
Designed for the remote-execution container where:
cdn.playwright.dev/dl.google.comare blocked — use Chrome for Testing viastorage.googleapis.com.- Ubuntu's
chromium-browseris a snap stub and won't run. - MCP servers can't be registered mid-session — use Playwright's Node API directly.
Setup (run once per fresh container)
⚠️ This project uses pnpm (
frontend/pnpm-lock.yamlis the source of truth). Do NOT runnpm ihere — npm ignores the pnpm lockfile and re-resolves transitive deps, which pulls broken versions (e.g.[email protected]vs the pinned1.46.1) that crash the whole SPA at load. See Troubleshooting below.
playwright is already a committed devDependency in frontend/package.json, so
a plain install provides it — no ad-hoc add/revert needed. @emotion/react /
@emotion/styled are likewise already declared.
# 1. Install deps from the lockfile (also fixes a node_modules previously
# polluted by npm — wipe it first with `rm -rf node_modules` if you suspect that).
cd frontend
pnpm install --frozen-lockfile
# 2. Download Chrome for Testing (Playwright's own Chromium download is blocked)
mkdir -p /tmp/chrome && cd /tmp/chrome
curl -fsSL -o chrome.zip \
"https://storage.googleapis.com/chrome-for-testing-public/148.0.7778.96/linux64/chrome-linux64.zip"
unzip -q chrome.zip # → /tmp/chrome/chrome-linux64/chrome
Do NOT modify frontend/package.json / frontend/pnpm-lock.yaml for tooling
anymore — everything needed is already committed. If a previous session left them
dirty (or npm polluted the tree), reset with:
cd <repo> && git checkout -- frontend/package.json frontend/pnpm-lock.yaml
pnpm -C frontend install --frozen-lockfile
Dev server
cd frontend
USE_MOCK=true node_modules/.bin/vite --mode mock --port 3000 &
until curl -fs http://localhost:3000 >/dev/null; do sleep 1; done
USE_MOCK=true must be a shell env var (read by vite.config.ts before .env.mock).
What ships with it
4 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 · 135 lines · 96 tokens per session scan C 5821600675b4
ui-preview is a skill published in the GitHub repository tingly-dev/tingly-box (345 stars, last pushed 2d ago), licensed MPL-2.0. It adds 96 tokens to every session and 1,597 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it C with 2 findings (recursive force delete, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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