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Create Multistage Dockerfile

Checked
pjt222·vlatest·cloud·MIT

Generates optimized, multistage Dockerfiles from requirements, streamlining builds and reducing image size for cloud deployments.

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 pjt222/agent-almanac --skill create-multistage-dockerfile -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

pjt222

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 pjt222/development-guides at bcca822c1c.

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

Commit
bcca822c1c
Manifest
skills/create-multistage-dockerfile/SKILL.md
Scanned
3 files, 641 lines
Copies in repo
3 — all of them scanned
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 automates the creation of multi-stage Dockerfiles. It allows you to define multiple stages in your build process, enabling you to optimize image size and security by separating build dependencies from runtime requirements. The resulting Dockerfile will be syntactically correct and ready for use in containerization workflows.

When to use it

  • Reducing Image Size: You want to create a smaller final Docker image by removing unnecessary build tools and libraries.
  • Improving Security: Separate build-time dependencies from the runtime environment, minimizing potential attack vectors.
  • Complex Builds: Your application requires multiple steps for compilation or processing during the containerization process.
  • Standardizing Build Processes: You need a consistent way to generate Dockerfiles across different projects and teams.

Key capabilities

  • Defines multiple build stages.
  • Copies artifacts between stages.
  • Optimizes image size by removing unnecessary layers.
  • Generates syntactically valid Dockerfile content.

Example prompts

  • "Create a multi-stage Dockerfile for a Go application with build and runtime stages."
  • "Generate a Dockerfile that compiles a Node.js application in one stage and copies the built files to a smaller base image in another stage."
  • “Build a multistage dockerfile, first compiling a C++ program then copying it into a minimal linux distribution.”

Tips & gotchas

  • The skill requires familiarity with Dockerfile syntax and concepts.
  • Specify dependencies clearly for each build stage to ensure accurate image creation.