setup-dev-env

setup-dev-env is a skill for Claude Code, Codex from yu-iskw/skill-inspector. It costs 35 tokens per session (629 once invoked), scanned A, original, Apache-2.0.

A checklist for preparing a project's development environment. It checks the required Node.js version, installs packages with pnpm, and sets up the project's managed linters and formatters.

In plain words
What is it for?
Use it when starting work on a project, when dependencies are out of sync, or when environment setup fails.
Why use it?
It addresses missing dependencies, mismatched runtime versions, and tooling that has not yet been installed.

Skill for Claude CodeCodex

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 skills/yu-iskw/skill-inspector/setup-dev-env
Any agent
npx skills add yu-iskw/skill-inspector --skill setup-dev-env
Clone the repo
git clone --depth 1 https://github.com/yu-iskw/skill-inspector

Made for: Claude Code, Codex.

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 setup-dev-env

README.md
[![agentmods](https://agentmods.dev/badge/skills/yu-iskw/skill-inspector/setup-dev-env.svg)](https://agentmods.dev/skills/yu-iskw/skill-inspector/setup-dev-env)
Your own site
<a href="https://agentmods.dev/skills/yu-iskw/skill-inspector/setup-dev-env"><img src="https://agentmods.dev/badge/skills/yu-iskw/skill-inspector/setup-dev-env.svg" alt="Measured on agentmods" height="20"></a>
Per session 35 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 629 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00035 $0.00629
Opus 5 $0.00017 $0.00315
Sonnet 5 $0.00007 $0.00126
Haiku 4.5 $0.00003 $0.00063

Measured 3d ago against content hash 0937b0d00fa3, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

setup-dev-env 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 3d 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.

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.

.claude/skills/setup-dev-env/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.

Setup Development Environment

This skill automates the process of setting up the development environment to ensure all tools and dependencies are correctly installed and configured.

Workflow Checklist

  • Step 1: Environment Validation
    • Check Node.js version against .node-version
    • Check for pnpm installation
  • Step 2: Dependency Installation
    • Run pnpm install (this also installs the trunk launcher)
  • Step 3: Tooling Setup
    • Run pnpm trunk install to fetch managed linters and formatters

Detailed Instructions

1. Environment Validation

Node.js Version

Read the .node-version file in the workspace root. Ensure the current Node.js environment matches this version. If there's a mismatch, inform the user to switch Node versions (e.g., using nvm or fnm).

Trunk CLI

Trunk is managed via pnpm in this project using @trunkio/launcher. This ensures it works in cloud environments like Claude Code Cloud without manual installation.

The trunk launcher is installed automatically during pnpm install. You can then run Trunk commands using pnpm trunk.

For local macOS users who prefer a global installation:

brew install trunk-io

For other platforms, refer to the Trunk installation documentation.

2. Dependency Installation

Run the following command at the workspace root to install all project dependencies, including the Trunk launcher. Refer to ../common-references/pnpm-commands.md for more pnpm commands.

pnpm install

3. Tooling Setup

Trunk manages linters and formatters hermetically. Run the following command to ensure all required tools are downloaded and ready.

pnpm trunk install

Refer to ../common-references/trunk-commands.md for more Trunk commands.

Success Criteria

  • All pnpm dependencies are installed successfully.
  • trunk is installed and all managed tools are initialized.
  • The Node.js version matches the requirement in .node-version.

Read the full file on GitHub · 72 lines

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. 3d ago First seen · 72 lines · 35 tokens per session scan A 0937b0d00fa3

Subscribe to this mod's changes

setup-dev-env is a skill published in the GitHub repository yu-iskw/skill-inspector (2 stars, last pushed 19d ago), licensed Apache-2.0. It adds 35 tokens to every session and 629 once invoked, about $0.0002 per session on Opus 5. 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 2026-08-31.

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