Claude Code Game Studios is a setup that organizes Claude Code into a coordinated game-development team of specialized AI agents. It supports game projects across design, programming, art, audio, narrative, quality assurance, and production, with skills and workflows for coordinating that work.
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/donchitos/claude-code-game-studios/skill-testnpx skills add Donchitos/Claude-Code-Game-Studios --skill skill-testgit clone --depth 1 https://github.com/Donchitos/Claude-Code-Game-StudiosWrote 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/donchitos/claude-code-game-studios/skill-test)<a href="https://agentmods.dev/skills/donchitos/claude-code-game-studios/skill-test"><img src="https://agentmods.dev/badge/skills/donchitos/claude-code-game-studios/skill-test.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 5.1 | $0.00031 | $0.03277 |
| Opus 5 | $0.00015 | $0.01639 |
| Sonnet 5 | $0.00006 | $0.00655 |
| Haiku 4.5 | $0.00003 | $0.00328 |
Grade A, and why
skill-test 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.
Copies of this mod
2 near-identical copies found in the catalogue:
- skill-test — 100% identical, 1 lines differ
- skill-test — 92% identical, 13 lines differ
How it starts
The opening of the file, as written. The whole thing — 358 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill Test
Validates .claude/skills/*/SKILL.md files for structural compliance and
behavioral correctness. No external dependencies — runs entirely within the
existing skill/hook/template architecture.
Four modes:
| Mode | Command | Purpose | Token Cost |
|---|---|---|---|
static |
/skill-test static [name|all] |
Structural linter — 7 compliance checks per skill | Low (~1k/skill) |
spec |
/skill-test spec [name] |
Behavioral verifier — evaluates assertions in test spec | Medium (~5k/skill) |
category |
/skill-test category [name|all] |
Category rubric — checks skill against its category-specific metrics | Low (~2k/skill) |
audit |
/skill-test audit |
Coverage report — skills, agent specs, last test dates | Low (~3k total) |
Phase 1: Parse Arguments
Determine mode from the first argument:
static [name]→ run 7 structural checks on one skillstatic all→ run 7 structural checks on all skills (Glob.claude/skills/*/SKILL.md)spec [name]→ read skill + test spec, evaluate assertionscategory [name]→ run category-specific rubric fromCCGS Skill Testing Framework/quality-rubric.mdcategory all→ run category rubric for every skill that has acategory:in catalogaudit(or no argument) → read catalog, list all skills and agents, show coverage
If argument is missing or unrecognized, output usage and stop.
Phase 2A: Static Mode — Structural Linter
For each skill being tested, read its SKILL.md fully and run all 7 checks:
Check 1 — Required Frontmatter Fields
The file must contain all of these in the YAML frontmatter block:
name:description:argument-hint:user-invocable:allowed-tools:
FAIL if any are absent.
Check 2 — Multiple Phases
The skill must have ≥2 numbered phase headings. Look for patterns like:
## Phase Nor## Phase N:## N.(numbered top-level sections)- At least 2 distinct
##headings if phases aren't explicitly numbered
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.
- 2d ago First seen · 358 lines · 31 tokens per session scan A 24d09805593a
skill-test is a skill published in the GitHub repository Donchitos/Claude-Code-Game-Studios (24,822 stars, last pushed 3mo ago), licensed MIT. It adds 31 tokens to every session and 3,277 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 2026-09-03.
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