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Dockerfile Best Practices

Checked
sarpit·vlatest·cloud

Generates secure, optimized Dockerfiles adhering to best practices, minimizing image size and maximizing deployment efficiency.

Repository

Install on your platform

Showing Claude Code. One command installs this skill into any of the agents below.

  1. 1

    Run this in your project

    terminal
    $ npx skills add sarpit/agent-skills --skill dockerfile-best-practices -a claude-code

  2. Uses the open-source skills CLI and needs Node.js. Add -g to install it for your user instead of this project.

What we know about this skill

Publisher

sarpit

Taken from the source listing. We haven't verified who controls this account.

Install target

Live repository

Not pinned. Installing fetches whatever the repository holds at the time you run the command.

No human has reviewed this code. The checks below are a static scan of the files at one commit — nobody has run this skill or judged whether it works. A skill runs with whatever access you give your agent, so read the source before you install it.

Automated safety checks

scanned

This skill passed all 6 checks. We read its files at one commit and looked for the things that make a skill dangerous to run — not for whether it works.

  • Declares what it does: passed

    SKILL.md parses and declares a name and a description.

    SKILL.md exists, its frontmatter parses, and it declares a name and a description.

  • No undeclared network calls: passed

    Makes no network calls.

    Every host the skill dials — from its scripts, its config endpoints or the commands it tells the agent to run — is either well-known package and API infrastructure or declared in its own frontmatter. Links in documentation are not counted.

  • No obfuscated payloads: passed

    No encoded or obfuscated payloads.

    No base64, hex or compressed blob is decoded and then executed, and no encoded shell commands.

  • No credential access: passed

    Reads no keys, tokens, keychains or credential files.

    Neither the code nor the SKILL.md instructions read SSH keys, cloud credentials, keychains, token stores, browser cookie databases or dotfiles that hold secrets.

  • No pipe-to-shell installers: passed

    No pipe-to-shell or download-and-run installers.

    No `curl … | sh` pattern, in the code or in the instructions, that runs code fetched at run time.

  • Pinned to a commit: passed

    Scanned sarpit/agent-skills at 98fdfaad44.

    The exact upstream commit SHA that was scanned is recorded, so the result refers to specific bytes.

Commit
98fdfaad44
Manifest
skills/dockerfile-best-practices/dockerfile-best-practices/SKILL.md
Scanned
1 file, 69 lines
This is a static scan, not a review. It reads the skill's files; it does not run them, and it cannot tell you whether the skill is any good or whether the code does what its description says. A skill runs with whatever access you give your agent.
What each check looks for →

About this skill

What it does

This skill provides guidance and recommendations for writing efficient and maintainable Dockerfiles. It helps users understand best practices around image layering, security, and overall optimization to reduce build times and improve container performance. The skill aims to produce well-structured Dockerfile instructions based on established industry standards.

When to use it

  • You're creating a new application or service that needs to be containerized.
  • Your existing Dockerfiles are slow to build or result in large image sizes.
  • You want to improve the security posture of your container images.
  • You need help understanding how to optimize Dockerfile commands for caching and efficiency.

Key capabilities

  • Dockerfile optimization advice
  • Image layering best practices
  • Security recommendations for Dockerfiles
  • Guidance on efficient command usage within a Dockerfile

Example prompts

  • "Review this Dockerfile and suggest improvements." (Provide the Dockerfile content)
  • "How can I reduce the size of my Docker image?"
  • "What are some common security vulnerabilities in Dockerfiles, and how can I avoid them?"

Tips & gotchas

The skill is most effective when provided with a complete or partial Dockerfile for review. While it offers general advice, specific context within your application's build process will yield the best results.