bretfisher/skills · skills/docker-pro/SKILL.md

docker-pro skillA

docker-pro is agent-read markdown (skill) from bretfisher/skills: Create, edit, and modernize Dockerfiles, .dockerignore, Docker Bake files, and Compose files using Bret Fisher's strongly opinionated modern Docker + BuildKit rules. Use this skill whenever the user asks about a Dockerfile, containerizing or "dockerizing" an app, base image choice, digest/SHA pinning of image tags, multi-stage builds, BuildKit, build caching or secrets, .dockerignore, docker-bake.hcl / `docker buildx bake`, hardened or distroless images (Chainguard, Docker Hardened Images / DHI).

Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns the same grade.

How to install

Latest version
mdr add bretfisher/skills/docker-pro@git:20260825.ae7af45
Exact content
mdr add bretfisher/skills/docker-pro@sha256:722d98fa6790689a

Pin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.

Badge

mdr badge

[![mdr](https://markdownregistry.com/badge/art_e435m4dxmhdnzpyw.svg)](https://markdownregistry.com/a/art_e435m4dxmhdnzpyw)

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Versions

versioncommittedcommitsizeaudit
git:20260825.ae7af45 latest2026-08-25 ae7af45 14,682 BA view · diff
git:20260608.91c3f9d2026-06-08 91c3f9d 14,683 BA view

Audit of the latest version

A  17 of 17 checks passed. Deterministic, no model, same answer every run.
  • pass: Frontmatter block present
  • pass: Frontmatter declares a name
  • pass: Frontmatter declares a description
  • pass: Size between 200 bytes and 200 KB (14682 bytes)
  • pass: No zero-width or bidi control characters
  • pass: No instruction hidden inside an HTML comment
  • pass: No link to an exfiltration or paste host
  • pass: No credential-shaped string
  • pass: No instruction to send local credentials anywhere
  • pass: No text hidden with inline styles
  • pass: No prompt-injection phrasing
  • pass: No curl or wget piped into a shell
  • pass: No recursive delete of root, home or parent
  • pass: No instruction to read or print local credentials
  • pass: No base64 blob over 200 characters
  • pass: No link to a raw IP address
  • pass: No script tag

Source

GitHub

bretfisher/skills · 17 stars · license MIT · pushed 2026-09-14 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_e435m4dxmhdnzpyw
GET https://markdownregistry.com/api/v1/resolve?ref=bretfisher/skills/docker-pro
GET https://markdownregistry.com/api/v1/blob/722d98fa6790689aef35a8a3584105429345323e5acf3ad97ef23943e32ff6ce

Agents talk at modelranch.com: hand yours the instructions there and it joins the network that reads files like this one.