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/day-one-patchnpx skills add Donchitos/Claude-Code-Game-Studios --skill day-one-patchgit 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/day-one-patch)<a href="https://agentmods.dev/skills/donchitos/claude-code-game-studios/day-one-patch"><img src="https://agentmods.dev/badge/skills/donchitos/claude-code-game-studios/day-one-patch.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 | $0.00063 | $0.02035 |
| Opus 5 | $0.00032 | $0.01018 |
| Sonnet 5 | $0.00013 | $0.00407 |
| Haiku 4.5 | $0.00006 | $0.00203 |
Grade A, and why
day-one-patch 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
3 near-identical copies found in the catalogue:
- day-one-patch — 98% identical, 1 lines differ
- day-one-patch — 92% identical, 14 lines differ
- day-one-patch — 92% identical, 8 lines differ
How it starts
The opening of the file, as written. The whole thing — 227 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Day-One Patch
Every shipped game has a day-one patch. Planning it before launch day prevents chaos. This skill scopes the patch to only what is safe and necessary, gates it through a lightweight QA pass, and ensures a rollback plan exists before anything ships. It is a mini-sprint — not a hotfix, not a full sprint.
When to run:
- After the gold master build is locked (cert approved or launch candidate tagged)
- When known bugs exist that are too risky to address in the gold master
- When cert feedback requires minor fixes post-submission
- When a pre-launch playtest surfaces must-fix issues after the release gate passed
Day-one patch scope rules:
- Only P1/P2 bugs that are SAFE to fix quickly
- No new features — this is fix-only
- No refactoring — minimum viable change
- Any fix that requires more than 4 hours of dev time belongs in patch 1.1, not day-one
Output: production/releases/day-one-patch-[version].md
Phase 1: Load Release Context
Read:
production/stage.txt— confirm project is in Release stage- The most recent file in
production/gate-checks/— read the release gate verdict production/qa/bugs/*.md— load all bugs with Status: Open or Fixed — Pending Verificationproduction/sprints/most recent — understand what shippedproduction/security/security-audit-*.mdmost recent — check for any open security items
If production/stage.txt is not Release or Polish:
"Day-one patch prep is for Release-stage projects. Current stage: [stage]. This skill is not appropriate until you are approaching launch."
Phase 2: Scope the Patch
Step 2a — Classify open bugs for patch inclusion
For each open bug, evaluate:
| Criterion | Include in day-one? |
|---|---|
| S1 or S2 severity | Yes — must include if safe to fix |
| P1 priority | Yes |
| Fix estimated < 4 hours | Yes |
| Fix requires architecture change | No — defer to 1.1 |
| Fix introduces new code paths | No — too risky |
| Fix is data/config only (no code change) | Yes — very low risk |
| Cert feedback requirement | Yes — required for platform approval |
| S3/S4 severity | Only if trivial config fix; otherwise defer |
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 · 227 lines · 63 tokens per session scan A eb48e1eb8a57
day-one-patch is a skill published in the GitHub repository Donchitos/Claude-Code-Game-Studios (24,822 stars, last pushed 3mo ago), licensed MIT. It adds 63 tokens to every session and 2,035 once invoked, about $0.0003 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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Verify a game with evidence on its selected target runtime. Launch the actual build and prove real rendering, input, the core loop, at least one designed outcome, restart, and explicit limitations without dressing subjective fun up as a certain verdict. Use for test a generated game, QA a game build, check whether the…