dev-container-setup

dev-container-setup is a skill for Claude Code, Codex from paruff/uFawkesAI. It costs 42 tokens per session (472 once invoked), scanned A, original, MIT.

A validation guide for devcontainers, which are configuration files that create a consistent development environment inside a container.

In plain words
What is it for?
Use it to inspect devcontainer.json, Dockerfile.dev, Node.js, Python, Kubernetes tools, kustomize, Fawkes CLI, VS Code extensions, and Coder compatibility.
Why use it?
It checks whether projects provide the expected tools, editor setup, ports, and workspace configuration so developers and automated workspaces start consistently.

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/paruff/ufawkesai/dev-container-setup
Any agent
npx skills add paruff/uFawkesAI --skill dev-container-setup
Clone the repo
git clone --depth 1 https://github.com/paruff/uFawkesAI

Made for: Claude Code, 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 dev-container-setup

README.md
[![agentmods](https://agentmods.dev/badge/skills/paruff/ufawkesai/dev-container-setup.svg)](https://agentmods.dev/skills/paruff/ufawkesai/dev-container-setup)
Your own site
<a href="https://agentmods.dev/skills/paruff/ufawkesai/dev-container-setup"><img src="https://agentmods.dev/badge/skills/paruff/ufawkesai/dev-container-setup.svg" alt="Measured on agentmods" height="20"></a>
Per session 42 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 472 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00042 $0.00472
Opus 5 $0.00021 $0.00236
Sonnet 5 $0.00008 $0.00094
Haiku 4.5 $0.00004 $0.00047

Measured 3d ago against content hash 761bd6ac5813, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

dev-container-setup 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 3d 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.

.agents/skills/dev-experience/dev-container-setup/SKILL.md · 76 lines

What it actually says

Skill: Dev Container Setup

Load trigger: "load dev-container-setup skill" > DORA: Cap 3 (AI-Accessible Internal Data) Token cost: Low

Purpose

Provide a reproducible, standardized development environment for all Fawkes projects using devcontainers.

Responsibilities

  • Validate devcontainer.json
  • Validate Dockerfile.dev
  • Validate required tools (Node, Python, Fawkes CLI, kubectl, kustomize)
  • Validate VS Code extensions
  • Validate Coder compatibility

Inputs

  • .devcontainer/ directory
  • Project repo

Outputs

  • devcontainer-report.json
  • missing-tools.txt

Sub-Skills

Skill Purpose
dev-container-setup/toolchain-validation Verify tools and versions
dev-container-setup/coder-validation Validate Coder workspace config

Validation Rules

devcontainer.json

  • Base image specified
  • Features defined
  • Extensions listed
  • Post-create command defined
  • ForwardPorts configured (if needed)

Required Tools

Tool Version Required
Node.js ≥ 18 Yes
Python ≥ 3.10 If Python project
kubectl Latest If K8s
kustomize Latest If GitOps
Fawkes CLI Latest Yes
Docker ≥ 20 Yes

Tools

  • Devcontainer CLI
  • Docker CLI

Success Criteria

  • Devcontainer builds successfully
  • All required tools installed
  • Developer can start coding immediately
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. 3d ago First seen · 76 lines · 42 tokens per session scan A 761bd6ac5813

Subscribe to this mod's changes

dev-container-setup is a skill published in the GitHub repository paruff/uFawkesAI (2 stars, last pushed 11d ago), licensed MIT. It adds 42 tokens to every session and 472 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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