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 skills add rondorkerin/gamestack --skill gamestack-upgradegit clone --depth 1 https://github.com/rondorkerin/gamestackWrote 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/rondorkerin/gamestack/gamestack-upgrade)<a href="https://agentmods.dev/skills/rondorkerin/gamestack/gamestack-upgrade"><img src="https://agentmods.dev/badge/skills/rondorkerin/gamestack/gamestack-upgrade/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/rondorkerin/gamestack/gamestack-upgrade"><img src="https://agentmods.dev/badge/skills/rondorkerin/gamestack/gamestack-upgrade.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00100 | $0.00432 |
| Opus 5 | $0.00050 | $0.00216 |
| Sonnet 5 | $0.00020 | $0.00086 |
| Haiku 4.5 | $0.00010 | $0.00043 |
Grade A, and why
gamestack-upgrade 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 10d 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.
What it actually says
Gamestack Upgrade
Claude Code's plugin auto-update is a client-side opt-in: each user (or org admin) toggles it per marketplace via /plugin → Marketplaces → Enable auto-update, and third-party marketplaces like gamestack default to off. This repo can't flip that switch for anyone. What it can ship is a skill that does the check on demand, using the same claude plugin CLI surface auto-update uses internally — invoking this skill is the manual equivalent of a successful auto-update pass.
When to use this
- The user asks if gamestack is current, or asks to update it
- Before relying on a skill that might have changed recently (e.g. before a long headless run)
- Anytime — it's a read-then-maybe-write check, safe to run speculatively
What it produces
A version report (current → latest, or "already current") plus, if it updated, the relevant CHANGELOG.md entries and a reminder to run /reload-plugins.
The procedure
Read UPDATE.md for the full step-by-step: locate the install, refresh the marketplace, run the update, and report what changed.
The one rule
Never hand-roll the version diff.
claude plugin updatealready computes "is there a newer version" using the same cache-key logic as auto-update — don't parse JSON or compare version strings yourself to decide whether to update; just run it and report what it says.
Start at UPDATE.md.
What ships with it
1 file 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.
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.
- 10d ago First seen · 29 lines · 100 tokens per session scan A d7087ea67797
gamestack-upgrade is a skill published in the GitHub repository rondorkerin/gamestack (28 stars, last pushed 2mo ago), licensed MIT. It adds 100 tokens to every session and 432 once invoked, about $0.0005 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 2026-08-30.
Other skills, from other repositories
ux-design
Guided, section-by-section UX spec authoring for a screen, flow, or HUD. Reads game concept, player journey, and relevant GDDs to provide context-aware design guidance. Produces ux-spec.md (per screen/flow) or hud-design.md using the studio templates.
architecture-review
Validates completeness and consistency of the project architecture against all GDDs. Builds a traceability matrix mapping every GDD technical requirement to ADRs, identifies coverage gaps, detects cross-ADR conflicts, verifies engine compatibility consistency across all decisions, and produces a PASS/CONCERNS/FAIL…
localize
Full localization pipeline: scan for hardcoded strings, extract and manage string tables, validate translations, generate translator briefings, run cultural/sensitivity review, manage VO localization, test RTL/platform requirements, enforce string freeze, and report coverage.
vertical-slice
Pre-Production validation — build a production-quality end-to-end build to confirm the full game loop is achievable before committing to Production. Run after GDDs, architecture, and UX specs are complete. Produces a PROCEED/PIVOT/KILL verdict that gates the Pre-Production → Production transition.
quick-design
Lightweight design spec for small changes — tuning adjustments, minor mechanics, balance tweaks. Skips full GDD authoring when a system GDD already exists or the change is too small to warrant one. Produces a Quick Design Spec that embeds directly into story files.
soak-test
Generate a soak test protocol for extended play sessions. Defines what to observe, measure, and log during long play sessions to surface slow leaks, fatigue effects, and edge cases that only appear after sustained play. Primarily used in Polish and Release phases.