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 TraftG/opencode-game-studio --skill startgit clone --depth 1 https://github.com/TraftG/opencode-game-studioWrote 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/traftg/opencode-game-studio/start)<a href="https://agentmods.dev/skills/traftg/opencode-game-studio/start"><img src="https://agentmods.dev/badge/skills/traftg/opencode-game-studio/start.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 | $0.00022 | $0.01767 |
| Opus 5 | $0.00011 | $0.00883 |
| Sonnet 5 | $0.00004 | $0.00353 |
| Haiku 4.5 | $0.00002 | $0.00177 |
Grade A, and why
start 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 3d 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.
How it starts
The opening of the file, as written. The whole thing — 181 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Guided Onboarding
This skill is the entry point for new users. It does NOT assume you have a game idea, an engine preference, or any prior experience. It asks first, then routes you to the right workflow.
Workflow
1. Detect Project State (Silent)
Before asking anything, silently gather context so you can tailor your guidance. Do NOT show these results unprompted — they inform your recommendations, not the conversation opener.
Check:
- Engine configured? Read
.opencode/docs/technical-preferences.md. If the Engine field contains[TO BE CONFIGURED], the engine is not set. - Game concept exists? Check for
design/gdd/game-concept.md. - Source code exists? Glob for source files in
src/(*.gd,*.cs,*.cpp,*.h,*.rs,*.py,*.js,*.ts). - Prototypes exist? Check for subdirectories in
prototypes/. - Design docs exist? Count markdown files in
design/gdd/. - Production artifacts? Check for files in
production/sprints/orproduction/milestones/.
Store these findings internally. You will use them to validate the user's self-assessment and to tailor follow-up recommendations.
2. Ask Where the User Is
This is the first thing the user sees. Present these 4 options clearly:
Welcome to Opencode Game Studios!
Before I suggest anything, I'd like to understand where you're starting from. Where are you at with your game idea right now?
A) No idea yet — I don't have a game concept at all. I want to explore and figure out what to make.
B) Vague idea — I have a rough theme, feeling, or genre in mind (e.g., "something with space" or "a cozy farming game") but nothing concrete.
C) Clear concept — I know the core idea — genre, basic mechanics, maybe a pitch sentence — but haven't formalized it into documents yet.
D) Existing work — I already have design docs, prototypes, code, or significant planning done. I want to organize or continue the work.
Wait for the user's answer. Do not proceed until they respond.
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.
- 3d ago First seen · 181 lines · 22 tokens per session scan A 7c8620fbe2e1
start is a skill published in the GitHub repository TraftG/opencode-game-studio (38 stars, last pushed 4mo ago), licensed MIT. It adds 22 tokens to every session and 1,767 once invoked, about $0.0001 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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