day-one-patch

day-one-patch is a skill for Claude Code, Codex from IdoCohen560/claude-unity-game-studio. It costs 63 tokens per session (1,965 once invoked), scanned A, a copy of day-one-patch, MIT.

A focused plan for preparing a small game update around launch. It selects and prioritises known serious bugs, defines the fixes and testing, and includes a way to undo the update if it causes problems.

In plain words
What is it for?
Use it after the final launch build is locked when important bugs or certification issues still need attention before or just after release.
Why use it?
Launch issues need quick, controlled decisions while the team is under time pressure. This keeps the update limited to safe bug fixes and prevents last-minute work from expanding into new features or risky rewrites.

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/idocohen560/claude-unity-game-studio/day-one-patch
Any agent
npx skills add IdoCohen560/claude-unity-game-studio --skill day-one-patch
Clone the repo
git clone --depth 1 https://github.com/IdoCohen560/claude-unity-game-studio

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 day-one-patch

README.md
[![agentmods](https://agentmods.dev/badge/skills/idocohen560/claude-unity-game-studio/day-one-patch.svg)](https://agentmods.dev/skills/idocohen560/claude-unity-game-studio/day-one-patch)
Your own site
<a href="https://agentmods.dev/skills/idocohen560/claude-unity-game-studio/day-one-patch"><img src="https://agentmods.dev/badge/skills/idocohen560/claude-unity-game-studio/day-one-patch.svg" alt="Measured on agentmods" height="20"></a>
Per session 63 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,965 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin 92% copy Near-identical to another mod 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 $0.00063 $0.01965
Opus 5 $0.00032 $0.00983
Sonnet 5 $0.00013 $0.00393
Haiku 4.5 $0.00006 $0.00197

Measured yesterday against content hash 475669401cd4, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-05, from the pricing page.

Security

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 yesterday.

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.

Origin

This is a copy

92% identical to day-one-patch — 8 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

examples/my-first-game/.claude/skills/day-one-patch/SKILL.md · 219 lines

How it starts

The opening of the file, as written. The whole thing — 219 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 Verification
  • production/sprints/ most recent — understand what shipped
  • production/security/security-audit-*.md most 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

Read the full file on GitHub · 219 lines

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. yesterday First seen · 219 lines · 63 tokens per session scan A 475669401cd4

Subscribe to this mod's changes

day-one-patch is a skill published in the GitHub repository IdoCohen560/claude-unity-game-studio (17 stars, last pushed 1mo ago), licensed MIT. It adds 63 tokens to every session and 1,965 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. It is 92% identical to day-one-patch, differing in 8 lines, and is treated as a copy.

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