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.
npx agentmods add skills/0xdarkmatter/claude-mods/docker-opsnpx skills add 0xDarkMatter/claude-mods --skill docker-opsgit clone --depth 1 https://github.com/0xDarkMatter/claude-modsWrote 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.
[](https://agentmods.dev/skills/0xdarkmatter/claude-mods/docker-ops)<a href="https://agentmods.dev/skills/0xdarkmatter/claude-mods/docker-ops"><img src="https://agentmods.dev/badge/skills/0xdarkmatter/claude-mods/docker-ops.svg" alt="Measured on agentmods" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00070 | $0.02514 |
| Opus 5 | $0.00035 | $0.01257 |
| Sonnet 5 | $0.00014 | $0.00503 |
| Haiku 4.5 | $0.00007 | $0.00251 |
Grade B, and why
docker-ops 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 5d 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.
| User | `USER nonroot` (create if needed) | Run as root in production | 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.
| Package install | `apt-get update && apt-get install -y ... && rm -rf /var/lib/apt/lists/*` | Separate `RUN` for update and install | 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.
test: ["CMD", "curl", "-f", "http://localhost:8000/health"] How it starts
The opening of the file, as written. The whole thing — 288 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Docker Operations
Comprehensive Docker patterns for building, running, and composing containerized applications.
Dockerfile Best Practices
| Practice | Do | Don't |
|---|---|---|
| Base image | FROM node:20-slim |
FROM node:latest |
| Layer caching | Copy dependency files first, then source | COPY . . before RUN install |
| Package install | apt-get update && apt-get install -y ... && rm -rf /var/lib/apt/lists/* |
Separate RUN for update and install |
| User | USER nonroot (create if needed) |
Run as root in production |
| Multi-stage | Separate build and runtime stages | Ship compiler toolchains |
| Secrets | --mount=type=secret (BuildKit) |
COPY .env . or ARG PASSWORD |
| ENTRYPOINT vs CMD | ENTRYPOINT for fixed binary, CMD for defaults |
Relying on shell form for signal handling |
| WORKDIR | WORKDIR /app |
RUN cd /app && ... |
| .dockerignore | Include .git, node_modules, __pycache__ |
No .dockerignore at all |
| Labels | LABEL org.opencontainers.image.* |
No metadata |
Multi-Stage Build Decision Tree
Choose your runtime base image by language:
Go ──────────── CGO disabled? ──── Yes ──► scratch or distroless/static
No ───► distroless/base or alpine
Rust ─────────── Static musl? ──── Yes ──► scratch or distroless/static
No ───► distroless/cc or debian-slim
Node.js ──────── Need native? ──── Yes ──► node:20-slim
No ───► node:20-alpine (smaller)
Python ────────── Need C libs? ─── Yes ──► python:3.12-slim
No ───► python:3.12-slim (still slim)
Java ──────────── JRE only ──────────────► eclipse-temurin:21-jre-alpine
See:
references/multi-stage-builds.mdfor complete annotated examples per language.
Layer Caching Rules
Docker caches each layer. A cache miss at layer N invalidates all subsequent layers.
What Invalidates Cache
| Trigger | Effect |
|---|---|
Changed file in COPY/ADD |
Invalidates this layer + all below |
Changed RUN command text |
Invalidates this layer + all below |
Changed ARG value |
Invalidates from the ARG declaration down |
--no-cache flag |
Invalidates everything |
| Base image update | Invalidates everything |
What ships with it
5 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.
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.
- 5d ago First seen · 288 lines · 70 tokens per session scan B 6060177ee990
docker-ops is a skill published in the GitHub repository 0xDarkMatter/claude-mods (32 stars, last pushed 12d ago), licensed MIT. It adds 70 tokens to every session and 2,514 once invoked, about $0.0003 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 2026-08-30.
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