dev-environment-bootstrapper

dev-environment-bootstrapper is a skill for Claude Code, Codex from patricio0312rev/skillset. It costs 77 tokens per session (1,450 once invoked), scanned C, a copy of dev-environment-bootstrapper, MIT.

A setup toolkit for keeping development tools and versions consistent across machines. It can create version-manager files, environment-variable templates, setup scripts, and onboarding instructions.

In plain words
What is it for?
Use it to standardize Node.js, Python, and Ruby versions, configure tools such as Volta or mise, create `.env.example`, and document setup.
Why use it?
It reduces setup differences and avoids problems caused by using the wrong language, runtime, package-manager, or environment-variable versions.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Needs its repository: it runs a file that does not travel with it, so clone the repository first. The line is ./scripts/setup.sh.

Good fit Use it to standardize Node.js, Python, and Ruby versions, configure tools such as Volta or mise, create .env.example, and document setup.

Compare 6 skills from other repositories ↓
Install

Getting it into your agent

It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.

Clone the repo
git clone --depth 1 https://github.com/patricio0312rev/skillset
agentmods
npx agentmods add skills/patricio0312rev/skillset/dev-environment-bootstrapper

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 dev-environment-bootstrapper

README.md
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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.

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Your own site · 80×15
<a href="https://agentmods.dev/skills/patricio0312rev/skillset/dev-environment-bootstrapper"><img src="https://agentmods.dev/badge/skills/patricio0312rev/skillset/dev-environment-bootstrapper.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 77 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,450 The whole file, excluding the scripts and references it only reads on demand.
Security scan C 2 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin 100% copy Near-identical to another mod 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 $0.00077 $0.01450
Opus 5 $0.00039 $0.00725
Sonnet 5 $0.00015 $0.00290
Haiku 4.5 $0.00008 $0.00145

Measured 9d ago against content hash ca5448e2d7ce, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade C, and why

dev-environment-bootstrapper 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 9d 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.

Downloads and executes remote codehighSupply chain

curl | sh runs whatever the server returns today, which is not necessarily what it returned when this was reviewed.

curl https://get.volta.sh | bash

Makes network callslowCapability

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

curl https://get.volta.sh | bash
Origin

This is a copy

100% identical to dev-environment-bootstrapper — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

templates/foundation/dev-environment-bootstrapper/SKILL.md · 260 lines

How it starts

The opening of the file, as written. The whole thing — 260 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Dev Environment Bootstrapper

Create consistent, reproducible development environments across all machines.

Core Workflow

  1. Detect stack: Identify languages and tools used in project
  2. Choose version manager: Select appropriate tool (Volta, asdf, mise, nvm, pyenv)
  3. Generate configs: Create .tool-versions, .nvmrc, package.json volta fields, etc.
  4. Setup environment vars: Create .env.example with all required variables
  5. Write setup script: Generate bootstrap script for automated setup
  6. Create onboarding doc: Write SETUP.md with step-by-step instructions

Version Management Strategies

Volta (Recommended for Node.js)

// package.json
{
  "volta": {
    "node": "20.11.0",
    "pnpm": "8.15.0"
  }
}

asdf (Multi-language)

# .tool-versions
nodejs 20.11.0
python 3.11.7
ruby 3.2.2

mise (Modern alternative to asdf)

# .mise.toml
[tools]
node = "20.11.0"
python = "3.11"

nvm (Node.js only)

# .nvmrc
20.11.0

Environment Variables Template

# .env.example

# Application
NODE_ENV=development
PORT=3000

# Database
DATABASE_URL=postgresql://user:password@localhost:5432/dbname

# External APIs
OPENAI_API_KEY=sk-...
STRIPE_SECRET_KEY=sk_test_...

# Feature Flags
ENABLE_FEATURE_X=false

Setup Script Structure

For Node.js Projects

#!/bin/bash
set -e

echo "🚀 Setting up development environment..."

# Check prerequisites
command -v pnpm >/dev/null 2>&1 || { echo "Installing pnpm..."; npm install -g pnpm; }

# Install dependencies
echo "📦 Installing dependencies..."
pnpm install

# Setup environment
echo "⚙️ Setting up environment variables..."
cp .env.example .env
echo "Edit .env file with your values"

# Setup database (if needed)
if [ -f "prisma/schema.prisma" ]; then
  echo "🗄️ Setting up database..."
  pnpm prisma generate
  pnpm prisma migrate dev
fi

echo "✅ Setup complete! Run 'pnpm dev' to start"

For Python Projects

#!/bin/bash
set -e

echo "🚀 Setting up development environment..."

# Create virtual environment
python -m venv venv
source venv/bin/activate

# Install dependencies
pip install -r requirements.txt
pip install -r requirements-dev.txt

# Setup environment
cp .env.example .env

# Run migrations
python manage.py migrate

echo "✅ Setup complete! Run 'source venv/bin/activate && python manage.py runserver'"

Read the full file on GitHub · 260 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. 9d ago First seen · 260 lines · 77 tokens per session scan C ca5448e2d7ce

Subscribe to this mod's changes

dev-environment-bootstrapper is a skill published in the GitHub repository patricio0312rev/skillset (6 stars, last pushed 8mo ago), licensed MIT. It adds 77 tokens to every session and 1,450 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it C with 2 findings (downloads and executes remote code, makes network calls). It is 100% identical to dev-environment-bootstrapper, differing in 0 lines, and is treated as a copy.

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