RomM is a self-hosted application for organizing, enriching, browsing, and playing video game ROM collections. Emulator users use it to manage games across many platforms, add metadata and artwork, and play supported titles in a browser.
Borrowing it
Nothing to install: this file belongs to rommapp/romm. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/rommapp/romm/master/.claude/skills/backend-development/SKILL.mdgit clone --depth 1 https://github.com/rommapp/rommWrote 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/rommapp/romm/backend-development)<a href="https://agentmods.dev/skills/rommapp/romm/backend-development"><img src="https://agentmods.dev/badge/skills/rommapp/romm/backend-development/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/rommapp/romm/backend-development"><img src="https://agentmods.dev/badge/skills/rommapp/romm/backend-development.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00107 | $0.02701 |
| Opus 5.5 | $0.00043 | $0.01080 |
| Sonnet 5.5 | $0.00021 | $0.00540 |
| Haiku 4.5 | $0.00011 | $0.00270 |
Grade A, and why
backend-development 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 27d 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.
The source is not reproduced here
Licensed AGPL-3.0
The repository is licensed AGPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.
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.
- 27d ago Changed · +2 lines bdb16bb5524b
- 28d ago Changed · +1 lines 84deacdeab26
- 1mo ago Changed 2e4bdefe46fc
- 1mo ago Changed 636f83e46f6d
- 1mo ago Changed · +2 lines 0795255be378
- 1mo ago Changed · +1 lines 3e10eb8e4a4b
- 1mo ago Changed · +1 lines d8f71e6e7d37
- 1mo ago Changed · +1 lines 287fa95648ff
- 1mo ago Changed · +1 lines 6b0e307ebec3
- 1mo ago First seen · 102 lines · 107 tokens per session scan A 92e1bbebd35a
backend-development is a skill published in the GitHub repository rommapp/romm (14,134 stars, last pushed today), licensed AGPL-3.0. It adds 107 tokens to every session and 2,701 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 2026-08-30.
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