docker-optimizer

docker-optimizer is a skill for Claude Code from nek1987/auto-agent-harness. It costs 38 tokens per session (1,038 once invoked), scanned B, original, no licence file.

A Dockerfile reviewer that checks the instructions used to build a Docker image. It looks for recommended practices, security problems, and ways to reduce image size.

In plain words
What is it for?
Use it to review Dockerfiles, improve build caching, reduce image sizes, and check container-build security.
Why use it?
It helps find avoidable security risks and unnecessary image content before containers are built or deployed. It also points out issues with layer caching and multi-stage builds.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter.

Good fit Use it to review Dockerfiles, improve build caching, reduce image sizes, and check container-build security.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/nek1987/auto-agent-harness/docker-optimizer
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 nek1987/auto-agent-harness --skill docker-optimizer
Clone the repo
git clone --depth 1 https://github.com/nek1987/auto-agent-harness

Made for: Claude Code.

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-optimizer

README.md
[![agentmods](https://agentmods.dev/badge/skills/nek1987/auto-agent-harness/docker-optimizer/github.svg)](https://agentmods.dev/skills/nek1987/auto-agent-harness/docker-optimizer)
Your own site
<a href="https://agentmods.dev/skills/nek1987/auto-agent-harness/docker-optimizer"><img src="https://agentmods.dev/badge/skills/nek1987/auto-agent-harness/docker-optimizer/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-optimizer

Your own site · 80×15
<a href="https://agentmods.dev/skills/nek1987/auto-agent-harness/docker-optimizer"><img src="https://agentmods.dev/badge/skills/nek1987/auto-agent-harness/docker-optimizer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 38 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,038 The whole file, excluding the scripts and references it only reads on demand.
Security scan B 3 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin unknown 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 $0.00038 $0.01038
Opus 5 $0.00019 $0.00519
Sonnet 5 $0.00008 $0.00208
Haiku 4.5 $0.00004 $0.00104

Measured 9d ago against content hash 29e10c792864, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade B, and why

docker-optimizer scanned grade B with 3 findings 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 rootlowPrivilege escalation

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

**Don't run as root:**

Downgraded: this mod is about security review, or the phrase is quoted, so it is likely naming the pattern rather than instructing it.

Recursive force deletemediumDestructive command

rm -rf with a variable or a broad path is one typo away from removing the wrong tree.

rm -rf /var/lib/apt/lists/*

Downgraded: this mod is about security review, or the phrase is quoted, so it is likely naming the pattern rather than instructing it.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

RUN apt-get install -y curl
.claude/skills/docker-optimizer/SKILL.md · 197 lines

The source is not reproduced here

A licence we could not identify

The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.

Read it on GitHub

Files

What ships with it

2 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 · 197 lines · 38 tokens per session scan B 29e10c792864

Subscribe to this mod's changes

docker-optimizer is a skill published in the GitHub repository nek1987/auto-agent-harness (5 stars, last pushed 5mo ago), with no licence file. It adds 38 tokens to every session and 1,038 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it B with 3 findings (asks for root, recursive force delete, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.

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