dockerfile-skill

dockerfile-skill is a skill for Claude Code, Codex from labring/sealos-skills. It costs 90 tokens per session (3,740 once invoked), scanned A, original, no licence file.

A coding-agent guide that creates or improves Dockerfiles, which are recipes for packaging an application and its dependencies into a Docker container. It can account for projects with multiple packages and use separate build stages.

In plain words
What is it for?
Use it to write, generate, fix, or improve a Dockerfile, including for monorepos—repositories containing several related projects—and to repeat builds while correcting problems.
Why use it?
It removes much of the trial and error involved in containerizing a GitHub project or fixing Docker build failures.

Skill for Claude CodeCodex

Written for Claude Code and Codex: shipped in a Claude Code plugin, but also agents/openai.yaml present.

Part of the sealos plugin — 8 skills shipped together , and of sealos

Good fit Use it to write, generate, fix, or improve a Dockerfile, including for monorepos—repositories containing several related projects—and to repeat builds while correcting problems.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/labring/sealos-skills/dockerfile-skill
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 labring/sealos-skills --skill dockerfile-skill
Clone the repo
git clone --depth 1 https://github.com/labring/sealos-skills

Made for: Claude Code, Codex.

Or install sealos, the plugin that ships this one along with the rest of its 8 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 dockerfile-skill

README.md
[![agentmods](https://agentmods.dev/badge/skills/labring/sealos-skills/dockerfile-skill/github.svg)](https://agentmods.dev/skills/labring/sealos-skills/dockerfile-skill)
Your own site
<a href="https://agentmods.dev/skills/labring/sealos-skills/dockerfile-skill"><img src="https://agentmods.dev/badge/skills/labring/sealos-skills/dockerfile-skill/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 dockerfile-skill

Your own site · 80×15
<a href="https://agentmods.dev/skills/labring/sealos-skills/dockerfile-skill"><img src="https://agentmods.dev/badge/skills/labring/sealos-skills/dockerfile-skill.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 90 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,740 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. Third-party audits
  • Socket warn 14 May 2026
  • Snyk fail 14 May 2026
How audits are shown
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 5.1 $0.00090 $0.03740
Opus 5 $0.00045 $0.01870
Sonnet 5 $0.00018 $0.00748
Haiku 4.5 $0.00009 $0.00374

Measured 9d ago against content hash 3b7a14625ca8, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

dockerfile-skill 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 9d ago.

The scan reads SKILL.md. This mod also ships 6 executable files (scripts/test-static-nginx-template.mjs, scripts/validate-dockerfile.mjs, templates/assets/docker-entrypoint-drizzle.sh, …), 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.

HTTP_CODE=$(curl -s -o /dev/null -w "%{http_code}" http://localhost:3210)
skills/dockerfile-skill/SKILL.md · 353 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. 9d ago First seen · 353 lines · 90 tokens per session scan A 3b7a14625ca8

Subscribe to this mod's changes

dockerfile-skill is a skill published in the GitHub repository labring/sealos-skills (78 stars, last pushed 25d ago), with no licence file. It adds 90 tokens to every session and 3,740 once invoked, about $0.0005 per session on Opus 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 2026-08-30.