docker-pro SKILL.md skillA
docker-pro from bretfisher/skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add bretfisher/skills/docker-pro@git:20261104.e27cb65Pins git:20261104.e27cb65 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- bretfisher/skills
- Path
plugins/devops/skills/docker-pro/SKILL.md- Versions recorded
- 1
- Latest version
- git:20261104.e27cb65, committed Nov 4, 2026
- Size
- 15,111 bytes
- Repository stars
- 21
- License
- MIT
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…
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Modern Docker & BuildKit Rules Use this skill when creating, editing, reviewing, or modernizing any Docker build or run files: `Dockerfile`, `.dockerignore`, `docker-bake.hcl`, and `compose.yaml`. Be strongly opinionated and apply these defaults proactively, unless the repository already has clear conflicting conventions or the user explicitly asks for a different tradeoff. These rules assume **BuildKit** is the builder (the default in modern Docker Engine and in `docker buildx`). That assumption is what lets us use every modern frontend feature below without guarding for legacy builders. ## Working Style 1. Inspect the repo before writing. Detect the language/runtime, package manager, lockfiles, build output dir, and any existing Docker files so your output matches reality instead of a generic template. 2. Prefer the smallest correct change, but don't preserve legacy patterns (no `version:` in compose, secrets baked into layers, `apt-get` without cache mounts) when you're already editing that file. …
Read the whole file at its exact version.
How to install
mdr add bretfisher/skills/docker-pro@sha256:1c2efcb956830944The line at the top of this page pins the label git:20261104.e27cb65, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_5vx7ctv6tzathkmr)
0 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Nov 4, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (15111 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
bretfisher/skills · 21 stars · license MIT · pushed 2026-11-07 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_5vx7ctv6tzathkmr GET https://markdownregistry.com/api/v1/resolve?ref=bretfisher/skills/docker-pro GET https://markdownregistry.com/api/v1/blob/1c2efcb956830944d5bc790f9bccf5d5e91b8fd518679d58dbd82bca2ef0156f
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.