coder-workspace-validation

A checker for development containers running in Coder, a platform that provides cloud-based workspaces. It reviews the workspace template, container image, resource limits, and startup scripts.

In plain words
What is it for?
Use it to check Coder workspace settings, .devcontainer files, CPU, memory, disk space, startup commands, extensions, environment variables, Git hooks, and required services.
Why use it?
It helps catch configuration problems before a Coder workspace fails to start or lacks the resources and setup the project needs.

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/coder-validation
Any agent
npx skills add paruff/uFawkesAI --skill coder-validation
Clone the repo
git clone --depth 1 https://github.com/paruff/uFawkesAI

Made for: Claude Code, Codex.

Per session 33 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 415 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 $0.00033 $0.00415
Opus 5 $0.00016 $0.00208
Sonnet 5 $0.00007 $0.00083
Haiku 4.5 $0.00003 $0.00042

Measured 2d ago against content hash 0d7525aea806, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

coder-workspace-validation 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 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.

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/coder-validation/SKILL.md · 80 lines

What it actually says

Skill: Coder Workspace Validation

Load trigger: "load coder-workspace-validation skill" > DORA: Cap 3 (AI-Accessible Internal Data) Token cost: Low

Purpose

Ensure devcontainers run correctly inside Coder workspaces.

Responsibilities

  • Validate Coder template
  • Validate workspace image
  • Validate resource limits
  • Validate startup scripts

Inputs

  • Coder workspace config
  • .devcontainer/ directory

Outputs

  • coder-workspace.json

Validation Rules

Template

  • Base image specified and buildable
  • Resource limits defined (CPU, memory, disk)
  • Startup script defined
  • Extensions auto-installed

Resources

Resource Minimum Recommended
CPU 2 cores 4 cores
Memory 4 GB 8 GB
Disk 20 GB 50 GB

Startup

  • Dependencies installed on start
  • Git hooks configured
  • Environment variables set
  • Services started (if needed)

Output Format

{
  "skill": "coder-workspace-validation",
  "status": "pass | fail",
  "template": {
    "base_image": "valid",
    "resources": "sufficient",
    "startup_script": "defined"
  },
  "issues": []
}

Success Criteria

  • Workspace boots cleanly
  • All tools available
  • Startup completes without errors
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 · 80 lines · 33 tokens per session scan A 0d7525aea806

Subscribe to this mod's changes

coder-workspace-validation is a skill published in the GitHub repository paruff/uFawkesAI (2 stars, last pushed 10d ago), licensed MIT. It adds 33 tokens to every session and 415 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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