Agent skill

Docker

Docker expert for containers, Compose, Dockerfiles, and debugging

Apache-2.0Auto-check: notesDevOps & Cloud

Install Docker

skills CLI

$ npx skills add RightNow-AI/openfang --skill docker -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install RightNow-AI/openfang docker --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/RightNow-AI/openfang.git skills-src && mkdir -p .claude/skills && cp -r skills-src/crates/openfang-skills/bundled/docker .claude/skills/docker && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Paste into Claude Code

Install the "docker" agent skill from https://github.com/RightNow-AI/openfang/tree/main/crates/openfang-skills/bundled/docker into .claude/skills/docker/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "docker", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/RightNow-AI/openfang/tree/main/crates/openfang-skills/bundled/docker

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add RightNow-AI/openfang --skill docker -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install RightNow-AI/openfang docker --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/RightNow-AI/openfang.git skills-src && mkdir -p .agents/skills && cp -r skills-src/crates/openfang-skills/bundled/docker .agents/skills/docker && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "docker" agent skill from https://github.com/RightNow-AI/openfang/tree/main/crates/openfang-skills/bundled/docker into .agents/skills/docker/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "docker", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add RightNow-AI/openfang --skill docker -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install RightNow-AI/openfang docker --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/RightNow-AI/openfang.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/crates/openfang-skills/bundled/docker .cursor/skills/docker && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "docker" agent skill from https://github.com/RightNow-AI/openfang/tree/main/crates/openfang-skills/bundled/docker into .cursor/skills/docker/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "docker", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/RightNow-AI/openfang.git --path crates/openfang-skills/bundled/docker

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add RightNow-AI/openfang --skill docker -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install RightNow-AI/openfang docker --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/RightNow-AI/openfang.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/crates/openfang-skills/bundled/docker .gemini/skills/docker && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "docker" agent skill from https://github.com/RightNow-AI/openfang/tree/main/crates/openfang-skills/bundled/docker into .gemini/skills/docker/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "docker", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install RightNow-AI/openfang docker

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add RightNow-AI/openfang --skill docker -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/RightNow-AI/openfang.git skills-src && mkdir -p .github/skills && cp -r skills-src/crates/openfang-skills/bundled/docker .github/skills/docker && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "docker" agent skill from https://github.com/RightNow-AI/openfang/tree/main/crates/openfang-skills/bundled/docker into .github/skills/docker/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "docker", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add RightNow-AI/openfang --skill docker -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install RightNow-AI/openfang docker --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/RightNow-AI/openfang.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/crates/openfang-skills/bundled/docker .opencode/skills/docker && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "docker" agent skill from https://github.com/RightNow-AI/openfang/tree/main/crates/openfang-skills/bundled/docker into .opencode/skills/docker/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "docker", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: docker
GitHub stars: 18k
Token cost: ~560 tokens
SKILL.md length: 281 words
Files: 1
Skills in repo: 68
Repo updated: Jul 2, 2026
First seen: Oct 7, 2026
Licence: Apache-2.0

At a glance

Docker expert for containers, Compose, Dockerfiles, and debugging

Tasks that involve Containers
SKILL.md covers Key Principles, Dockerfile Best Practices, Debugging Techniques and Compose Patterns, plus 1 more section
Calls docker

What it does

Docker is an agent skill from RightNow-AI/openfang. Docker expert for containers, Compose, Dockerfiles, and debugging

Its SKILL.md is about 560 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in DevOps & Cloud, covering Containers. It works with Docker. The repository describes itself as: Open-source Agent Operating System. The licence is Apache-2.0.

When your agent uses it

Tasks that involve Containers

Example prompts

“/docker”

Requirements

Docker

What it can do on your machine

Read from SKILL.md and the folder at commit acf2587. It shows what the files ask for, not the result of running them.

Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Shell commands in SKILL.md call:
- docker
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md. Its commands use docker, which can reach the network depending on how they are called.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Docker loads about 560 tokens when it runs. Until then it costs about 18 tokens; SKILL.md has 281 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~18
When it runs · the whole SKILL.md, loaded when a task matches: ~560

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check: notes

The automated check noted patterns worth knowing about, such as sudo or a known installer.

NoteMentions a .env fileSKILL.md:36

- Use environment variable files (`.env`) for configuration, but never commit secrets to version control.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from RightNow-AI/openfang at commit acf2587, republished under its Apache-2.0 licence (© RightNow-AI). 281 words, ~560 tokens.

Download SKILL.mdSave it as .claude/skills/docker/SKILL.md (or your agent's skills folder).

name: docker
description: Docker expert for containers, Compose, Dockerfiles, and debugging

Docker Expert

You are a Docker specialist. You help users build, run, debug, and optimize containers, write Dockerfiles, manage Compose stacks, and troubleshoot container issues.

Key Principles

Always use specific image tags (e.g., node:20-alpine) instead of latest for reproducibility.
Minimize image size by using multi-stage builds and Alpine-based images where appropriate.
Never run containers as root in production. Use USER directives in Dockerfiles.
Keep layers minimal — combine related RUN commands with && and clean up package caches in the same layer.

Dockerfile Best Practices

Order instructions from least-changing to most-changing to maximize layer caching. Dependencies before source code.
Use .dockerignore to exclude node_modules, .git, build artifacts, and secrets.
Use COPY --from=builder in multi-stage builds to keep final images lean.
Set HEALTHCHECK instructions for production containers.
Prefer COPY over ADD unless you specifically need URL fetching or tar extraction.

Debugging Techniques

Use docker logs <container> and docker logs --follow for real-time output.
Use docker exec -it <container> sh to inspect a running container.
Use docker inspect to check networking, mounts, and environment variables.
For build failures, use docker build --no-cache to rule out stale layers.
Use docker stats and docker top for resource monitoring.

Compose Patterns

Use named volumes for persistent data. Never bind-mount production databases.
Use depends_on with condition: service_healthy for proper startup ordering.
Use environment variable files (.env) for configuration, but never commit secrets to version control.
Use docker compose up --build --force-recreate when debugging service startup issues.

Pitfalls to Avoid

Do not store secrets in image layers — use build secrets (--secret) or runtime environment variables.
Do not ignore the build context size — large contexts slow builds dramatically.
Do not use docker commit for production images — always use Dockerfiles for reproducibility.

Files

Just SKILL.md in crates/openfang-skills/bundled/docker of RightNow-AI/openfang.

Open the folder on GitHubat commit acf2587

Compare with similar skills

Docker next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Docker compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Docker this skillRightNow-AI/openfang	18k	—	~560	Automated safety check: Notes	Apache-2.0	3 mo ago
Iron Proxy Gateway for NanoClawnanocoai/nanoclaw	31k	—	~4.6k	Automated safety check: Notes	MIT	yesterday
GreptimeDB Dev Docker ImageGreptimeTeam/greptimedb	6.7k	—	~4k	Automated safety check: Notes	Apache-2.0	2 days ago
Senior DevOps Toolkitmaslennikov-ig/claude-code-orchestrator-kit	259	6 repos	~1.1k	Automated safety check: Notes	Custom licence	7 mo ago
LangBot Deployment Guidelangbot-app/LangBot	18k	—	~1.2k	Automated safety check: Notes	Apache-2.0	today
Build Openshell Mxc WindowsNVIDIA/OpenShell	15k	—	~4.9k	Automated safety check: Pass	Apache-2.0	today

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Questions about Docker

What does Docker do?

Docker expert for containers, Compose, Dockerfiles, and debugging. Docker is an agent skill from RightNow-AI/openfang.

When should I use Docker?

Docker fits situations like: tasks that involve Containers.

How do I install Docker in Claude Code?

Run `npx skills add RightNow-AI/openfang --skill docker -a claude-code`. Or copy the skill folder (crates/openfang-skills/bundled/docker in RightNow-AI/openfang) into .claude/skills/docker in your project. Claude Code loads it when a task matches its description.

How do I install Docker in Codex?

Run `npx skills add RightNow-AI/openfang --skill docker -a codex`. Or copy the skill folder (crates/openfang-skills/bundled/docker in RightNow-AI/openfang) into .agents/skills/docker in your project. Codex loads it when a task matches its description.

Can I use Docker in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add RightNow-AI/openfang --skill docker -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/docker, .gemini/skills/docker, .github/skills/docker and .opencode/skills/docker in your project.

What does Docker need to run?

Going by SKILL.md and its folder, Docker needs the command-line tools its instructions call (docker). Our summary lists: Docker.

Does Docker access the network?

SKILL.md contains no URLs. Its commands use docker, which can reach the network depending on how they are called. This is read from the text; nothing was executed.

Is Docker safe to install?

Our automated static check of SKILL.md found notes only (mentions a .env file), nothing it rates as a warning. It is not a guarantee. Review the folder before installing.

What licence does Docker use?

Docker is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Docker use?

About 560 tokens (SKILL.md is roughly 2.2k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Docker?

Skills that share tags, products or a category with Docker: Iron Proxy Gateway for NanoClaw (nanocoai/nanoclaw, 31k stars), GreptimeDB Dev Docker Image (GreptimeTeam/greptimedb, 6.7k stars), Senior DevOps Toolkit (maslennikov-ig/claude-code-orchestrator-kit, 259 stars) and LangBot Deployment Guide (langbot-app/LangBot, 18k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Docker?

RightNow-AI (a GitHub organization) maintains it in RightNow-AI/openfang, which has 18,212 GitHub stars. The repository holds 68 skills in this directory. The repository was last updated on July 2, 2026.

Source: RightNow-AI/openfang on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Docker

Install Docker

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Docker Expert

Key Principles

Dockerfile Best Practices

Debugging Techniques

Compose Patterns

Pitfalls to Avoid

Files

Compare with similar skills

Similar skills

Iron Proxy Gateway for NanoClaw

GreptimeDB Dev Docker Image

Senior DevOps Toolkit

LangBot Deployment Guide

Build Openshell Mxc Windows

Omnigent Docker Compose Deploy

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Questions about Docker

Install Docker

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Docker Expert

Key Principles

Dockerfile Best Practices

Debugging Techniques

Compose Patterns

Pitfalls to Avoid

Files

Compare with similar skills

Similar skills

More from RightNow-AI/openfang

Related

Questions about Docker