start-app

start-app is a command for coding agents from alfredang/skills. It costs 36 tokens per session (1,248 once invoked), scanned C, original, no licence file.

A command that identifies a project's type, starts its development server on localhost, and opens it in a browser. Localhost means the app runs on your own computer rather than a public website.

In plain words
What is it for?
Launching different kinds of projects for local development while automatically selecting a free port and the appropriate start command.
Why use it?
It avoids looking up the right start command, choosing a port already in use, and opening the app manually.

Command

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.

agentmods
npx agentmods add commands/alfredang/skills/start-app
Clone the repo
git clone --depth 1 https://github.com/alfredang/skills

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 start-app

README.md
[![agentmods](https://agentmods.dev/badge/commands/alfredang/skills/start-app.svg)](https://agentmods.dev/commands/alfredang/skills/start-app)
Your own site
<a href="https://agentmods.dev/commands/alfredang/skills/start-app"><img src="https://agentmods.dev/badge/commands/alfredang/skills/start-app.svg" alt="Measured on agentmods" height="20"></a>
Per session 36 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,248 The whole file, excluding the scripts and references it only reads on demand.
Security scan C 1 finding. Scan, not verified.
Origin unknown 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 $0.00036 $0.01248
Opus 5 $0.00018 $0.00624
Sonnet 5 $0.00007 $0.00250
Haiku 4.5 $0.00004 $0.00125

Measured 4d ago against content hash e82aa4447fad, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade C, and why

start-app scanned grade C 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 4d 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.

Recursive force deletehighDestructive command

rm -rf with a variable or a broad path is one typo away from removing the wrong tree.

`Bash(cat *)`, `Bash(ls *)`, `Bash(grep *)`, `Bash(npm install*)`, `Bash(npm run *)`, `Bash(npm start*)`, `Bash(npx serve*)`, `Bash(node *)`, `Bash(python *)`, `Bash(python3 *)`, `Bash(pip install*)`, `Bash(uv sync*)`, `
commands/start-app.md · 63 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

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. 4d ago First seen · 63 lines · 36 tokens per session scan C e82aa4447fad

Subscribe to this mod's changes

start-app is a command published in the GitHub repository alfredang/skills (2 stars, last pushed 2mo ago), with no licence file. It adds 36 tokens to every session and 1,248 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it C with 1 finding (recursive force delete). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.