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 frabcd/codex-ai-game-studio --skill setup-enginegit clone --depth 1 https://github.com/frabcd/codex-ai-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/frabcd/codex-ai-game-studio/setup-engine)<a href="https://agentmods.dev/skills/frabcd/codex-ai-game-studio/setup-engine"><img src="https://agentmods.dev/badge/skills/frabcd/codex-ai-game-studio/setup-engine/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/frabcd/codex-ai-game-studio/setup-engine"><img src="https://agentmods.dev/badge/skills/frabcd/codex-ai-game-studio/setup-engine.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 | $0.00044 | $0.00513 |
| Opus 5 | $0.00022 | $0.00257 |
| Sonnet 5 | $0.00009 | $0.00103 |
| Haiku 4.5 | $0.00004 | $0.00051 |
Grade A, and why
setup-engine 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 6d 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 — 40 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Port provenance: adapted from the pinned upstream source at
984023ddac0d5e27624f2baacde6105e45de375funder MIT; see the repository parity ledger for the exact path and blob.
Plan a compatible engine setup
This is a setup workflow and may be invoked only explicitly. It never installs, enables, launches, or reconfigures anything during its inspection and proposal phases.
- Run the read-only checks defined by
$ai-game-studio:toolchain-doctor. - Detect existing Unity, Godot, Unreal, browser, and project evidence before asking the user to choose an engine.
- Compare viable engines by project fit, platform export, team language, maturity, performance, accessibility, license, install size, and existing investment. Verify current terms before relying on them.
- Recommend one engine and one adapter. Do not activate more than one MCP server for the same host application.
- Produce one transaction containing
plan_id, environment evidence, exact actions, pinned sources, command arguments, downloads, licenses, permissions, conflicts, backups, health checks, uninstall and rollback operations, expiry, and digest. - Show every file that would be materialized, including root and path-scoped
AGENTS.md, selected.codex/agents/*.toml,.ai-game-studio/project.json, and.ai-game-studio/lock.json. - Wait for explicit confirmation of the exact digest. Applying the transaction is a separate operation. Changed evidence, an expired plan, or a digest mismatch requires a new plan.
If the preferred route is unavailable on the detected OS, architecture, GPU, or application version, first attempt a verified native adaptation. Otherwise show a concise alternative comparison and ask the user to confirm the substitution.
Codex portability
Use the search, file-editing, shell, user-input, and subagent capabilities available in the active Codex surface. Use PowerShell syntax on Windows and POSIX syntax on macOS/Linux; do not require a Unix compatibility layer on Windows. Inherit the active model and permission mode, and do not weaken approval or sandbox boundaries.
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.
- 6d ago First seen · 40 lines · 44 tokens per session scan A b49902af2106
setup-engine is a skill published in the GitHub repository frabcd/codex-ai-game-studio (10 stars, last pushed 3d ago), licensed MIT. It adds 44 tokens to every session and 513 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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