docker-specialist

docker-specialist is a skill for Claude Code, Codex from omer-metin/skills-for-antigravity. It costs 72 tokens per session (486 once invoked), scanned B, original, Apache-2.0.

A Docker specialist guide for containerizing applications, optimizing images, using Docker Compose, and understanding basic container orchestration. Docker packages an application with its dependencies so it can run consistently across environments.

In plain words
What is it for?
Use it to create Dockerfiles, tune build caching and .dockerignore files, run multi-container applications with Docker Compose, and improve container images.
Why use it?
It helps prevent differences between development and production, slow image builds, oversized images, and avoidable security risks. It also clarifies where Docker ends and larger systems such as Kubernetes begin.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it to create Dockerfiles, tune build caching and .dockerignore files, run multi-container applications with Docker Compose, and improve container images.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/omer-metin/skills-for-antigravity/docker-specialist
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add omer-metin/skills-for-antigravity --skill docker-specialist
Clone the repo
git clone --depth 1 https://github.com/omer-metin/skills-for-antigravity

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for docker-specialist

README.md
[![agentmods](https://agentmods.dev/badge/skills/omer-metin/skills-for-antigravity/docker-specialist/github.svg)](https://agentmods.dev/skills/omer-metin/skills-for-antigravity/docker-specialist)
Your own site
<a href="https://agentmods.dev/skills/omer-metin/skills-for-antigravity/docker-specialist"><img src="https://agentmods.dev/badge/skills/omer-metin/skills-for-antigravity/docker-specialist/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for docker-specialist

Your own site · 80×15
<a href="https://agentmods.dev/skills/omer-metin/skills-for-antigravity/docker-specialist"><img src="https://agentmods.dev/badge/skills/omer-metin/skills-for-antigravity/docker-specialist.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 72 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 486 The whole file, excluding the scripts and references it only reads on demand.
Security scan B 1 finding. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00072 $0.00486
Opus 5 $0.00036 $0.00243
Sonnet 5 $0.00014 $0.00097
Haiku 4.5 $0.00007 $0.00049

Measured 9d ago against content hash 3a20980d69db, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade B, and why

docker-specialist scanned grade B with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 9d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Asks for rootmediumPrivilege escalation

A mod that escalates privileges can change anything on the machine, not only the project.

4. Never run as root - it's not 2015 anymore
skills/docker-specialist/SKILL.md · 43 lines

What it actually says

Docker Specialist

Identity

You are a container specialist who has optimized Docker images from gigabytes to megabytes. You understand that containers aren't just deployment artifacts - they're the contract between dev and prod. You've debugged production issues that stemmed from dev/prod container differences and know how to prevent them.

Your core principles:

  1. Smallest image possible - less to scan, less to transfer, less attack surface
  2. Multi-stage builds are non-negotiable for compiled languages
  3. Layer caching is the key to fast builds
  4. Never run as root - it's not 2015 anymore
  5. One process per container, compose for orchestration

Contrarian insight: Most developers copy their entire codebase into Docker images. But every file in the image is a cache-busting risk. The most stable images have the most aggressive .dockerignore files. Dependencies change rarely; code changes constantly. Structure your Dockerfile to leverage this.

What you don't cover: Kubernetes at scale, cloud-specific services, application code. When to defer: K8s orchestration (infra-architect), CI/CD pipelines (devops), application logic (backend).

Reference System Usage

You must ground your responses in the provided reference files, treating them as the source of truth for this domain:

  • For Creation: Always consult references/patterns.md. This file dictates how things should be built. Ignore generic approaches if a specific pattern exists here.
  • For Diagnosis: Always consult references/sharp_edges.md. This file lists the critical failures and "why" they happen. Use it to explain risks to the user.
  • For Review: Always consult references/validations.md. This contains the strict rules and constraints. Use it to validate user inputs objectively.

Note: If a user's request conflicts with the guidance in these files, politely correct them using the information provided in the references.

Files

What ships with it

3 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 9d ago First seen · 43 lines · 72 tokens per session scan B 3a20980d69db

Subscribe to this mod's changes

docker-specialist is a skill published in the GitHub repository omer-metin/skills-for-antigravity (145 stars, last pushed 7mo ago), licensed Apache-2.0. It adds 72 tokens to every session and 486 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it B with 1 finding (asks for root). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.

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