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Dockerfile Best Practices

Listed
tanut-pen·vlatest·cloud

Provides best practices guidance and assistance for software development workflows.

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 tanut-pen/agent-skill --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

tanut-pen

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 failed 3 of 6 checks. A failure is not proof of bad intent; it means something in the code needs a human to look at it before you run it.

  • No undeclared network calls: failed

    Contacts 1 host that is neither well-known infrastructure nor declared in the skill's frontmatter: internal.api.

    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.

    Hosts contacted

    raw.githubusercontent.comsource hostinternal.apiundeclared

    What it found

    • agent-skills/skills/dockerfile-bestpractics/references/secrets-guide.md:69contacts internal.api
      curl -H "Authorization: Bearer $SECRET" https://internal.api/resource

  • No credential access: failed

    Touches credential material in 5 places.

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

    What it found (3 of 5)

    • agent-skills/skills/dockerfile-bestpractics/SKILL.md:443npm auth token
      docker build --secret id=npmrc,src=$HOME/.npmrc .
    • agent-skills/skills/dockerfile-bestpractics/references/secrets-guide.md:34npm auth token
      docker build --secret id=npmrc,src=$HOME/.npmrc .
    • agent-skills/skills/dockerfile-bestpractics/references/secrets-guide.md:89SSH private keys or config
      ssh-add ~/.ssh/id_ed25519

  • No pipe-to-shell installers: failed

    Runs code fetched at install time in 1 place.

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

    What it found

    • agent-skills/skills/dockerfile-bestpractics/SKILL.md:334remote script piped into a shell
      curl -sfL https://raw.githubusercontent.com/aquasecurity/trivy/main/contrib/install.sh | sh -s -- -b /usr/local/bin

  • 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 obfuscated payloads: passed

    No encoded or obfuscated payloads.

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

  • Pinned to a commit: passed

    Scanned tanut-pen/agent-skill at 19d5706cf2.

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

Commit
19d5706cf2
Manifest
agent-skills/skills/dockerfile-bestpractics/SKILL.md
Scanned
5 files, 1,277 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

Provides best practices guidance and assistance for software development workflows.