container-platforms

container-platforms is a skill for Codex from ashermahonin/agentic-skills. It costs 49 tokens per session (465 once invoked), scanned A, original, MIT.

A guide for building and reviewing containers, which package an application with the files and tools it needs to run. It covers Docker, Podman, Compose, and OCI images, a standard format for container images.

In plain words
What is it for?
Use it to write Dockerfiles, build development or production images, configure multi-container applications, improve build caching, run as a non-root user, and troubleshoot container or registry problems.
Why use it?
It helps avoid images that are unnecessarily large, difficult to reproduce, unsafe, or unreliable in development and production. It also supports checking how containers start, report health, and handle shutdowns.

Skill for Codex

Written for Codex: agents/openai.yaml present.

Good fit Use it to write Dockerfiles, build development or production images, configure multi-container…

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/ashermahonin/agentic-skills/container-platforms
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 ashermahonin/agentic-skills --skill container-platforms
Clone the repo
git clone --depth 1 https://github.com/ashermahonin/agentic-skills

Made for: 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 container-platforms

README.md
[![agentmods](https://agentmods.dev/badge/skills/ashermahonin/agentic-skills/container-platforms.svg)](https://agentmods.dev/skills/ashermahonin/agentic-skills/container-platforms)
Your own site
<a href="https://agentmods.dev/skills/ashermahonin/agentic-skills/container-platforms"><img src="https://agentmods.dev/badge/skills/ashermahonin/agentic-skills/container-platforms.svg" alt="Measured on agentmods" height="20"></a>
Per session 49 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 465 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. 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 $0.00049 $0.00465
Opus 5 $0.00024 $0.00233
Sonnet 5 $0.00010 $0.00093
Haiku 4.5 $0.00005 $0.00047

Measured 6d ago against content hash 340f0baab8f2, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

container-platforms scanned grade A with 0 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 6d 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.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

agentic/skills/container-platforms/SKILL.md · 48 lines

How it starts

The opening of the file, as written. The whole thing — 48 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Container Platforms

Purpose

You build and review container images and runtime definitions that are reproducible, lean enough, secure enough, and friendly to CI/CD and production schedulers.

Operational context

  1. Read references/workflow.md.
  2. Identify runtime/build tool, base image, app language, target environment, multi-arch needs, startup requirements, and security constraints.
  3. Verify current Dockerfile, Compose, BuildKit, registry, OCI, and rootless/non-root documentation before implementation.

Safe change sequence

  1. Classify the task: build-only, build-and-run, production image, dev image, compose stack, registry, or troubleshooting.
  2. Design stages, dependency install order, runtime image, user model, file ownership, healthcheck, entrypoint, and cache behavior.
  3. Implement with pinned base images where practical, .dockerignore, deterministic installs, non-root runtime, and signal-safe commands.
  4. Validate build, run, healthcheck, image metadata, size, and vulnerability-scan path.

Safety rules

  • Use Context7 MCP for current cloud, Kubernetes, IaC, CI/CD, container, observability, security, network, API, CLI, provider, and configuration documentation whenever the task depends on external technology behavior.

Change record

Provide container context, documentation validation status, Dockerfile/Compose changes, build/run commands, validation/security notes, and assumptions.

Verification

  • Avoid latest in production examples.
  • Do not copy secrets into images or build logs.
  • Prefer multi-stage builds for compiled apps.
  • Use exec-form entrypoints/commands for correct signal behavior.
  • Explain tradeoffs between image size, debuggability, and security.

Handoff

For pipeline integration, add cicd-automation. For Kubernetes deployment, add kubernetes-operations. For image scanning/signing/secrets, add security-secrets.

References

  • references/workflow.md for container design, security, performance, and validation.

Read the full file on GitHub · 48 lines

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. 6d ago First seen · 48 lines · 49 tokens per session scan A 340f0baab8f2

Subscribe to this mod's changes

container-platforms is a skill published in the GitHub repository ashermahonin/agentic-skills (10 stars, last pushed 13d ago), licensed MIT. It adds 49 tokens to every session and 465 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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