Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/fellipeutaka/leonnpx agentmods add skills/fellipeutaka/leon/dockerWrote 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/fellipeutaka/leon/docker)<a href="https://agentmods.dev/skills/fellipeutaka/leon/docker"><img src="https://agentmods.dev/badge/skills/fellipeutaka/leon/docker/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.
<a href="https://agentmods.dev/skills/fellipeutaka/leon/docker"><img src="https://agentmods.dev/badge/skills/fellipeutaka/leon/docker.svg" alt="Reviewed on agentmods" width="80" 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 5.1 | $0.00049 | $0.03806 |
| Opus 5.5 | $0.00020 | $0.01522 |
| Sonnet 5.5 | $0.00010 | $0.00761 |
| Haiku 4.5 | $0.00005 | $0.00381 |
Grade B, and why
docker 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 1mo 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.
| Run as root | `USER 1001` or named user | 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.
RUN mkdir src && echo "fn main() {}" > src/main.rs && cargo build --release && rm -rf src 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 How it starts
The opening of the file, as written. The whole thing — 601 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Docker Expert
When to Use
- Creating or reviewing Dockerfiles
- Optimizing image size or build performance
- Hardening container security
- Setting up Docker Compose for multi-service apps
- Debugging container networking, volumes, or runtime issues
- Containerizing applications (Node.js, Python, Go, Java, Rust)
Out of scope (recommend dedicated skills):
- Kubernetes orchestration → kubernetes expert
- CI/CD pipelines → github-actions expert
- Cloud-specific container services (ECS, Cloud Run) → devops expert
Core Principles
- Layer caching — order layers from least to most frequently changing
- Security-first — non-root users, minimal attack surface, no secrets in layers
- Minimal images — only include what's needed at runtime
- Reproducibility — pin versions, avoid
latesttag, use lockfiles
Base Image Selection
Recommended hierarchy (most to least preferred):
| Base Image | Size | Shell | Use Case |
|---|---|---|---|
cgr.dev/chainguard/* (Wolfi) |
~10-30MB | Yes | Zero-CVE goal, SBOM included |
alpine:3.21 |
~7MB | Yes | General-purpose minimal |
gcr.io/distroless/* |
~2-5MB | No | Hardened production, no debug |
*-slim variants |
~70-100MB | Yes | When Alpine compatibility is an issue |
scratch |
0MB | No | Static binaries (Go, Rust) |
Rules:
- Always pin exact versions:
node:22.14.0-alpine3.21notnode:alpine - Never use
latest— breaks reproducibility - Match base to actual runtime needs
Dockerfile Best Practices
Layer Ordering
# 1. Base image + system deps (rarely change)
FROM node:22-alpine
RUN apk add --no-cache dumb-init
# 2. Dependencies (change occasionally)
WORKDIR /app
COPY package.json package-lock.json ./
RUN npm ci --only=production
# 3. Application code (changes frequently)
COPY . .
# 4. Metadata + runtime config
USER node
EXPOSE 3000
CMD ["dumb-init", "node", "server.js"]
.dockerignore
Always create one to reduce build context:
.git
node_modules
__pycache__
*.pyc
.vscode
.idea
.DS_Store
*.log
coverage/
.env
.env.local
dist/
build/
README.md
docs/
What ships with it
1 file 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.
- 1mo ago First seen · 601 lines · 49 tokens per session scan B f3635a22900c
docker is a skill published in the GitHub repository fellipeutaka/leon (5 stars, last pushed 23d ago), licensed MIT. It adds 49 tokens to every session and 3,806 once invoked, about $0.0002 per session on Opus 5.5. 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 2026-08-31.
Other skills, from other repositories
deploy-docker-compose
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bdd-container-update
Update the BDD test container image when its dependencies or runtime change. Determines version bump (major vs minor vs patch), rebuilds the Docker image, pushes to GitLab registry, and updates the image tag in starttest.sh. Test source (tests/, features/, scripts/, data/, conftest.py) is bind-mounted from the host…
securing-kubernetes-on-cloud
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detecting-privilege-escalation-in-kubernetes-pods
Detect and prevent privilege escalation in Kubernetes pods by monitoring security contexts, capabilities, and syscall patterns with Falco and OPA policies.
docker-socket-mount
Docker / containerd socket mounted into a container → host RCE. Common in CI runners, GitOps controllers (ArgoCD, Flux), and 'Docker-in-Docker' setups. Single-command escape via docker run --rm --privileged -v /:/host alpine chroot /host.
managing-astro-local-env
Manage local Airflow environment with Astro CLI (Docker and standalone modes). Use when the user wants to start, stop, or restart Airflow, view logs, query the Airflow API, troubleshoot, or fix environment issues. For project setup, see setting-up-astro-project.