docker-development

A guide for development work involving Docker, a system for packaging applications and their dependencies into containers. It covers container files, Compose configurations, image builds, build automation, security checks, and CI/CD testing.

In plain words
What is it for?
Writing Dockerfiles, configuring Docker Compose, creating multi-stage builds, using Docker Bake, auditing container security, improving .dockerignore files, and testing containers in CI/CD.
Why use it?
It provides project guidance for common container tasks and helps keep builds, local environments, and automated tests consistent. It also addresses container security and unnecessary files in build contexts.

Skill for Claude CodeCodex

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.

agentmods
npx agentmods add skills/netresearch/docker-development-skill/docker-development
Any agent
npx skills add netresearch/docker-development-skill --skill docker-development
Clone the repo
git clone --depth 1 https://github.com/netresearch/docker-development-skill

Made for: Claude Code, Codex.

Per session 70 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,319 The whole file, excluding the scripts and references it only reads on demand.
Security scan C 4 findings. Scan, not verified.
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 $0.00070 $0.01319
Opus 5 $0.00035 $0.00660
Sonnet 5 $0.00014 $0.00264
Haiku 4.5 $0.00007 $0.00132

Measured 2d ago against content hash 6215c518d3d8, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade C, and why

docker-development scanned grade C with 4 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 2d 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.

| `chmod 777` | Use specific permissions: `chmod 550` |

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

Reaches for credential filesmediumPrivilege escalation

SSH keys, cloud credentials, git-credentials, .npmrc, /etc/shadow: reading these is how a config file becomes a credential leak.

RUN --mount=type=secret,id=ssh_key,dst=/root/.ssh/id_rsa git clone [email protected]:org/repo.git

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.

CMD wget -qO- http://localhost:3000/health || exit 1
skills/docker-development/SKILL.md · 140 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

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. 2d ago First seen · 140 lines · 70 tokens per session scan C 6215c518d3d8

Subscribe to this mod's changes

docker-development is a skill published in the GitHub repository netresearch/docker-development-skill (19 stars, last pushed 3d ago), with no licence file. It adds 70 tokens to every session and 1,319 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it C with 4 findings (asks for root, reaches for credential files, recursive force delete). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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