Twelve Factor App

Q: What is a Claude Code skill and how does the Twelve Factor App skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Twelve Factor App is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Security category. Learn more at https://claudskills.com/learn/what-is-skill-md/.

Category: Security · Sub-category: security-misc · Last updated: 2026-06-13

type:review

Reference guide for the Twelve-Factor App methodology — 15 principles (12 original + 3 modern extensions) for building portable, resilient, cloud-native applications. Use when evaluating application architecture, designing cloud-native services, reviewing codebases for methodology compliance, advising on configuration, scaling, observability, security, and deployment patterns. Incorporates the 2025 open-source community evolution and cloud-native reinterpretations of each factor.

From the source SKILL.md

The Twelve-Factor App is a methodology for building software-as-a-service applications that are portable, deployable on modern cloud platforms, and scalable without significant architectural changes. Originally published in 2011 by Adam Wiggins (Heroku), the methodology was open-sourced in November 2024 and is now actively maintained at [github.com/heroku/12factor](https://github.com/heroku/12factor) with community-driven updates for Kubernetes, containers, and GitOps workflows.

What this skill does

Twelve Factor App is a community-contributed Claude Code skill in the security-misc sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/twelve-factor-app/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when evaluating application architecture, designing cloud-native services, reviewing codebases for methodology compliance, advising on configuration, scaling, observability, security, and deployment patterns. Incorporates the 2025 open-source community evolution and cloud-native reinterpretations of each factor.

Who uses this skill

The Twelve Factor App Claude Code skill is built for security engineers, penetration testers, DevSecOps practitioners, and development teams hardening codebases and infrastructure. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 117,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/twelve-factor-app
curl -L https://claudskills.com/skills/twelve-factor-app/SKILL.md \
  -o ~/.claude/skills/twelve-factor-app/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/twelve-factor-app/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/twelve-factor-app/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\twelve-factor-app\SKILL.md on Windows. See the full install guide for step-by-step instructions.

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the Twelve Factor App Claude Code skill?

Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/twelve-factor-app/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.

What does the Twelve Factor App skill do?

Is this skill free to install?

Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.

When should I use the Twelve Factor App skill?

Use Twelve Factor App when your Claude Code task falls under the Security category — specifically in the security misc area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Twelve Factor App" or describe the task and let Claude pick). Browse related skills at /category/security/.

What is a Claude Code skill and how does the Twelve Factor App skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Twelve Factor App is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Security category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Source: https://github.com/Jamie-BitFlight/claude_skills/blob/da48cc284e8b6f088c422129480abefa4ecf0c5a/plugins/twelve-factor-app/skills/twelve-factor-app/SKILL.md
License: MIT
Author: Jamie-BitFlight

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA

Jamie-BitFlight. (2026). Twelve Factor App [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/twelve-factor-app/

BibTeX

@misc{twelve-factor-app-2026,
  author    = {Jamie-BitFlight},
  title     = {Twelve Factor App [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/twelve-factor-app/}
}

Embed this skill

Promote, attribute, or link this skill from your own README, blog post, or documentation. All three snippets are free to use — no sign-up, no API key. More distribution surfaces →

Badge

[![ClaudSkills](https://claudskills.com/badge/twelve-factor-app.svg)](https://claudskills.com/skills/twelve-factor-app/?utm_source=badge&utm_medium=readme&utm_campaign=skill_badge)

More Security skills

Browse all Security skills in the ClaudSkills registry, or explore these other picks from the same category:

Browse all Security skills → Top 100 skills

Part of ClaudSkills — the open registry for Claude Skills & Claude Code Skills. · What's New · Install guide · About · llms.txt

Part of Acreator Store — Adam Lankamer's AI tools: PerfectStudio · Ucaption · UTagger · AutoXPoster · TestYourSkills · AutomationFlows · Au Naturel · Telegram @acreatorstore