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 leihaht/gamemaker-skills --skill gamemaker-expertgit clone --depth 1 https://github.com/leihaht/gamemaker-skillsWrote 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/leihaht/gamemaker-skills/gamemaker-expert)<a href="https://agentmods.dev/skills/leihaht/gamemaker-skills/gamemaker-expert"><img src="https://agentmods.dev/badge/skills/leihaht/gamemaker-skills/gamemaker-expert/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/leihaht/gamemaker-skills/gamemaker-expert"><img src="https://agentmods.dev/badge/skills/leihaht/gamemaker-skills/gamemaker-expert.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 | $0.00095 | $0.06027 |
| Opus 5.5 | $0.00038 | $0.02411 |
| Sonnet 5.5 | $0.00019 | $0.01205 |
| Haiku 4.5 | $0.00010 | $0.00603 |
Grade A, and why
gamemaker-expert 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 2mo 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 — 742 lines — stays where its author put it; the contents beside it link to each section on GitHub.
GameMaker Expert
Overview
This skill provides comprehensive GameMaker Studio 2 and GML (GameMaker Language) expertise for all GameMaker projects. It covers everything from basic object creation to advanced topics like shader programming, networking, and platform-specific development.
When to use this skill:
- Working with
.gmlfiles (GML scripts and events) - Creating or modifying
.yyfiles (object definitions, sprite definitions, etc.) - Editing
.yypproject files - Creating GameMaker objects, scripts, or assets
- Debugging GameMaker compile errors or runtime issues
- Implementing GameMaker features (drawing, collision, networking, etc.)
- Optimizing GameMaker performance
- Any GameMaker Studio 2 development task
Official GameMaker Manual
PRIMARY REFERENCE: Always consult the official GameMaker Manual for comprehensive, up-to-date documentation: https://manual.gamemaker.io/monthly/en/
Key Manual Sections
- GML Overview: https://manual.gamemaker.io/monthly/en/GameMaker_Language/GML_Overview.htm
- Variables, data types, operators, keywords, control flow
- GML Reference: https://manual.gamemaker.io/monthly/en/GameMaker_Language/GML_Reference.htm
- All built-in functions organized by category (drawing, math, strings, instances, etc.)
- Objects & Events: https://manual.gamemaker.io/monthly/en/The_Asset_Editors/Objects.htm
- Object properties, event system, parent-child relationships
- Sprites: https://manual.gamemaker.io/monthly/en/The_Asset_Editors/Sprites.htm
- Sprite editor, collision masks, animations
- Data Structures: https://manual.gamemaker.io/monthly/en/GameMaker_Language/GML_Reference/Data_Structures.htm
- ds_list, ds_map, ds_grid, ds_priority, ds_queue, ds_stack
- File Handling: https://manual.gamemaker.io/monthly/en/GameMaker_Language/GML_Reference/File_Handling.htm
- File I/O, JSON, buffers, directories
When to use the official manual:
- Looking up function signatures and parameters
- Understanding platform-specific behavior
- Checking latest syntax changes for your IDE version
- Detailed explanations of GameMaker features
What ships with it
7 files 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.
- 2mo ago First seen · 742 lines · 95 tokens per session scan A 77cb5a75d91c
gamemaker-expert is a skill published in the GitHub repository leihaht/gamemaker-skills (6 stars, last pushed 1y ago), licensed MIT. It adds 95 tokens to every session and 6,027 once invoked, about $0.0004 per session on Opus 5.5. 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 2026-08-31.
gamemaker-expert compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| gamemaker-expertleihaht/gamemaker-skills | Skill | 6 | 1y ago | MIT | A | 95 | Claude Code, Codex |
| zoom-meeting-sdk-unrealanthropics/knowledge-work-plugins | Skill | 35k | 2d ago | Apache-2.0 | A | 41 | Claude Code |
| unreal-cpp-gameplaygamedev-skills/awesome-gamedev-agent-skills | Skill | 6.9k | 10d ago | Apache-2.0 | A | 105 | Claude Code |
| ue-mcp-native-cppdb-lyon/ue-mcp | Skill | 476 | yesterday | MIT | A | 83 | Claude Code, Codex |
| unreal-developmentCoWork-OS/CoWork-OS | Skill | 534 | yesterday | MIT | A | 31 | Claude Code, Codex |
| ue-cpp-foundationsquodsoler/unreal-engine-skills | Skill | 439 | 1mo ago | MIT | A | 180 | Claude Code, Codex |
| ags-aegledll1llu50ry/mcp-gamehacking | Skill | 392 | 9d ago | MIT | A | 47 | Claude Code, Codex |