How do I install the Docker skill?

Run npx skillmds@latest add ohare93/docker in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

Is Docker safe to use?

This skill has not completed SkillMD's automated safety review yet. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Docker?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Docker free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Docker?

ohare93 (@ohare93) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Docker by ohare93 — Agent Skill

Name: Docker
Author: ohare93

File contents

Docker Image Version Checking

CRITICAL: Always use skopeo to check Docker image versions - never try to parse Docker Hub web pages or use browser scraping.

Why Skopeo

Reliable: Direct registry API access, not HTML parsing
Fast: No JavaScript rendering or page loading
Comprehensive: Works with all OCI-compliant registries
Accurate: Gets data directly from registry without intermediaries

List Available Tags

# Docker Hub (official images)
skopeo list-tags docker://library/nginx
skopeo list-tags docker://library/postgres

# Docker Hub (user images)
skopeo list-tags docker://username/image
skopeo list-tags docker://rommapp/romm

# Quay.io
skopeo list-tags docker://quay.io/organization/image

# GitHub Container Registry
skopeo list-tags docker://ghcr.io/owner/repo

# Custom registry (like Gitea)
skopeo list-tags docker://git.munchohare.com/jmo/image

Inspect Specific Image/Tag

# Get detailed image information including labels, architecture, layers
skopeo inspect docker://rommapp/romm:4.3.2
skopeo inspect docker://git.munchohare.com/jmo/audioseek-frontend:0.1.11

# Inspect without pulling (faster)
skopeo inspect --no-tags docker://nginx:latest

Registry URL Patterns

Registry	URL Pattern
Docker Hub (official)	`docker://library/<image>`
Docker Hub (user)	`docker://<user>/<image>`
Quay.io	`docker://quay.io/<org>/<image>`
GHCR	`docker://ghcr.io/<owner>/<repo>`
Custom	`docker://<registry>/<path>`

Common Use Cases

Find Latest Version

# For semver tags (handles 1.10.0 > 1.9.0 correctly)
skopeo list-tags docker://rommapp/romm | jq -r '.Tags[]' | sort -V | tail -1

Check If Tag Exists

skopeo inspect docker://nginx:1.25 &>/dev/null && echo "exists" || echo "not found"

Compare Image Digests

skopeo inspect docker://nginx:latest | jq -r '.Digest'
skopeo inspect docker://nginx:1.25.3 | jq -r '.Digest'

Get Image Architecture

skopeo inspect docker://nginx:latest | jq -r '.Architecture'

---name: dockerdescription: Use when checking Docker image versions or working with container registries. Skopeo is the required tool for registry queries - never parse Docker Hub web pages.---# Docker Image Version Checking**CRITICAL**: Always use `skopeo` to check Docker image versions - never try to parse Docker Hub web pages or use browser scraping.## Why Skopeo- **Reliable**: Direct registry API access, not HTML parsing- **Fast**: No JavaScript rendering or page loading- **Comprehensive**: Works with all OCI-compliant registries- **Accurate**: Gets data directly from registry without intermediaries## List Available Tags```bash# Docker Hub (official images)skopeo list-tags docker://library/nginxskopeo list-tags docker://library/postgres# Docker Hub (user images)skopeo list-tags docker://username/imageskopeo list-tags docker://rommapp/romm# Quay.ioskopeo list-tags docker://quay.io/organization/image# GitHub Container Registryskopeo list-tags docker://ghcr.io/owner/repo# Custom registry (like Gitea)skopeo list-tags docker://git.munchohare.com/jmo/image```## Inspect Specific Image/Tag```bash# Get detailed image information including labels, architecture, layersskopeo inspect docker://rommapp/romm:4.3.2skopeo inspect docker://git.munchohare.com/jmo/audioseek-frontend:0.1.11# Inspect without pulling (faster)skopeo inspect --no-tags docker://nginx:latest```## Registry URL Patterns| Registry | URL Pattern ||----------|-------------|| Docker Hub (official) | `docker://library/<image>` || Docker Hub (user) | `docker://<user>/<image>` || Quay.io | `docker://quay.io/<org>/<image>` || GHCR | `docker://ghcr.io/<owner>/<repo>` || Custom | `docker://<registry>/<path>` |## Common Use Cases### Find Latest Version```bash# For semver tags (handles 1.10.0 > 1.9.0 correctly)skopeo list-tags docker://rommapp/romm | jq -r '.Tags[]' | sort -V | tail -1```### Check If Tag Exists```bashskopeo inspect docker://nginx:1.25 &>/dev/null && echo "exists" || echo "not found"```### Compare Image Digests```bashskopeo inspect docker://nginx:latest | jq -r '.Digest'skopeo inspect docker://nginx:1.25.3 | jq -r '.Digest'```### Get Image Architecture```bashskopeo inspect docker://nginx:latest | jq -r '.Architecture'```

Frequently asked questions

Docker