run-app

run-app is a skill for Claude Code from louisbrulenaudet/monorepo-template. It costs 109 tokens per session (2,078 once invoked), scanned A, original, Apache-2.0.

A project skill for starting local app servers and checking that their APIs and web interface work. It runs smoke tests, which are quick basic checks, and uses a headless browser to inspect the rendered app.

In plain words
What is it for?
Use it to run and verify the project's worker API and front-end, inspect request traces, and test a deployed Worker Preview URL.
Why use it?
It catches broken health checks, cross-origin request problems, missing pages, browser errors, and other failures before deployment. It also verifies that the app actually renders, not just that a server starts.

Skill for Claude Code

Written for Claude Code: SessionStart hook event. Also seen: mentions Claude Code; installed under .agents/ (shared by several agents).

Good fit Use it to run and verify the project's worker API and front-end, inspect request traces, and test a deployed Worker Preview URL.

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Install with agentmods
npx agentmods add skills/louisbrulenaudet/monorepo-template/run-app
Install

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.

Any agent
npx skills add louisbrulenaudet/monorepo-template --skill run-app
Clone the repo
git clone --depth 1 https://github.com/louisbrulenaudet/monorepo-template

Made for: Claude Code.

Wrote 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.

agentmods badge for run-app

README.md
[![agentmods](https://agentmods.dev/badge/skills/louisbrulenaudet/monorepo-template/run-app/github.svg)](https://agentmods.dev/skills/louisbrulenaudet/monorepo-template/run-app)
Your own site
<a href="https://agentmods.dev/skills/louisbrulenaudet/monorepo-template/run-app"><img src="https://agentmods.dev/badge/skills/louisbrulenaudet/monorepo-template/run-app/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.

agentmods 80×15 button for run-app

Your own site · 80×15
<a href="https://agentmods.dev/skills/louisbrulenaudet/monorepo-template/run-app"><img src="https://agentmods.dev/badge/skills/louisbrulenaudet/monorepo-template/run-app.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 109 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,078 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00109 $0.02078
Opus 5.5 $0.00044 $0.00831
Sonnet 5.5 $0.00022 $0.00416
Haiku 4.5 $0.00011 $0.00208

Measured 11d ago against content hash 4658ce712d31, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

run-app scanned grade A 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 11d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/smoke.mjs), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

Inside the Claude Code sandbox this loop needs `sandbox.network.allowLocalBinding` and two settings `env` entries: a sandbox-writable `CLOUDFLARE_REGISTRY_PATH` (cf's dev registry, which it also hands to Wrangler and Min
.agents/skills/run-app/SKILL.md · 72 lines

How it starts

The opening of the file, as written. The whole thing — 72 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Run and verify the apps

Run everything from the repository root. The smoke script discovers apps from apps/*/package.json (monorepo.role, monorepo.healthPath, monorepo.devPort), so a new app is covered without editing it.

Local loop

  1. Start each dev server as its own background Bash task (never a bare &). Both scripts are cf dev, which runs Vite:

    • pnpm --filter=worker-api dev - ready when Vite prints Local: http://localhost:8700/
    • pnpm --filter=front-app dev - ready when Vite prints Local: http://localhost:5174/

    Wait with one capped until grep -q 'localhost:<port>' …; do sleep 0.5; done on each task's output file. If the SessionStart context reported a port as already listening, reuse that server instead of starting a second one.

  2. node .github/actions/lib/smoke.mjs --traces - every line must read ok. --traces prints the latest requests the gateway captured, newest first.

  3. Browser check (the SPA is only verified once it has rendered):

    pnpm exec playwright-cli open http://localhost:5174
    pnpm exec playwright-cli snapshot        # Stack check card: status, version, latency, request id
    pnpm exec playwright-cli console error   # expect no errors
    pnpm exec playwright-cli requests        # /api/v1/health returned 200; an earlier [FAILED] net::ERR_ABORTED is StrictMode cancelling the first signal-bound fetch
    pnpm exec playwright-cli close
    

    Always type the pnpm exec playwright-cli prefix. The binary is a repo devDependency and is not on PATH, and that exact prefix is what sandbox.excludedCommands lets out of the sandbox: Chrome cannot start inside it. Never cd, pipe, or redirect it, and chain steps with plain && only: any other form runs it sandboxed, where it fails with EPERM on ~/Library/Caches/ms-playwright/daemon or loses the session; read --raw / --json output from stdout instead. The upstream playwright-cli skill documents every other command - apply the same prefix to its examples. If the browser is missing on a new machine: pnpm exec playwright-cli install-browser chromium.

  4. Stop both background tasks when done.

Read the full file on GitHub · 72 lines

Files

What ships with it

1 file 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.

Changes

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.

  1. 11d ago Changed · +19 lines 4658ce712d31
  2. 16d ago Changed e13c7b62bbb5
  3. 18d ago Changed d6dcd5c04839
  4. 19d ago Changed 6be8eea8b8dd
  5. 21d ago First seen · 53 lines · 109 tokens per session scan A 6dca0f978548

Subscribe to this mod's changes

run-app is a skill published in the GitHub repository louisbrulenaudet/monorepo-template (19 stars, last pushed today), licensed Apache-2.0. It adds 109 tokens to every session and 2,078 once invoked, about $0.0004 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-28.