dockerfile-linter

80 / 100 · Low risk

Fine to try. Some of what it can do is expected: a coding skill usually runs build and test commands.

By Lethe044/agentskill-kit (GitHub) · coding · 50 stars · scanned at commit e1abb2b

Checks a Dockerfile for common problems such as unpinned base images, running as root, ADD instead of COPY, secrets in ENV or ARG and apt-get without cleanup. Use when the user asks to review, harden or slim down a Dockerfile.

Works with any agent that supports SKILL.md skills.

What this skill can do

Runs commands on your computer

The author does not mention this. Expected for a coding skill.

Found in 1 place.

skills/dockerfile-linter/SKILL.md, line 24python scripts/lint_dockerfile.py Dockerfile

Downloads and installs other software

The author does not mention this.

Found in 5 places.

skills/dockerfile-linter/SKILL.md, line 34| `DF004` | `apt-get install` without `--no-install-recommends` |
skills/dockerfile-linter/scripts/lint_dockerfile.py, line 66if "apt-get install" in rest and "--no-install-recommends" not in rest:
skills/dockerfile-linter/scripts/lint_dockerfile.py, line 67add(number, "DF004", "warning", "apt-get install without --no-install-recommends")

Show 2 more

skills/dockerfile-linter/tests/cases.json, line 5"files": {"Dockerfile": "FROM python:latest\nENV API_TOKEN=abc\nADD app.py /app/app.py\nRUN apt-get update && apt-get install -y curl\nCMD [\"python\", \"/app/a
skills/dockerfile-linter/tests/cases.json, line 11"files": {"Dockerfile": "FROM debian:12\nRUN apt-get update && \\\n apt-get install -y --no-install-recommends curl && \\\n rm -rf /var/lib/apt/lists/*\nU

Install

Paste this into your terminal. It downloads exactly the version we scanned, not whatever is newest.

if [ -e ~/.agents/skills/'dockerfile-linter' ] || [ -L ~/.agents/skills/'dockerfile-linter' ]; then echo 'A skill folder named dockerfile-linter already exists — not replacing it' >&2; false; else d=$(mktemp -d) && git clone --quiet --filter=blob:none --no-checkout 'https://github.com/Lethe044/agentskill-kit' "$d" && git -C "$d" checkout --quiet 'e1abb2b2e0e26ee9a074afcbd95bbbd6729daa08' -- 'skills/dockerfile-linter' && mkdir -p ~/.agents/skills && cp -R "$d"/'skills/dockerfile-linter' ~/.agents/skills/'dockerfile-linter' && rm -rf "$d"; fi

Codex reads ~/.agents/skills directly. For Claude Code, Cursor, Copilot, Gemini CLI, Antigravity or OpenCode, also link it. For Claude Code: ln -s ~/.agents/skills/'dockerfile-linter' ~/.claude/skills/'dockerfile-linter' (other agents: ~/.cursor/skills, ~/.copilot/skills, ~/.gemini/skills, ~/.gemini/config/skills, ~/.config/opencode/skills). Or install through the finder skill, which does both.

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Score history

Date	Version	Score
2026-11-11	`e1abb2b`	80