Borrowing it
Nothing to install: this file belongs to nataliapc/mcp-openmsx. 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/nataliapc/mcp-openmsx/main/.agents/skills/mcp-openmsx-usage/SKILL.mdgit clone --depth 1 https://github.com/nataliapc/mcp-openmsxWrote 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/nataliapc/mcp-openmsx/mcp-openmsx-usage)<a href="https://agentmods.dev/skills/nataliapc/mcp-openmsx/mcp-openmsx-usage"><img src="https://agentmods.dev/badge/skills/nataliapc/mcp-openmsx/mcp-openmsx-usage/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/nataliapc/mcp-openmsx/mcp-openmsx-usage"><img src="https://agentmods.dev/badge/skills/nataliapc/mcp-openmsx/mcp-openmsx-usage.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 | $0.00103 | $0.01906 |
| Opus 5.5 | $0.00041 | $0.00762 |
| Sonnet 5.5 | $0.00021 | $0.00381 |
| Haiku 4.5 | $0.00010 | $0.00191 |
Grade A, and why
mcp-openmsx-usage 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.
The source is not reproduced here
Licensed GPL-2.0
The repository is licensed GPL-2.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.
What ships with it
20 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.
- references/basic-programming.md 6.3 KB
- references/debug-asm.md 13 KB
- references/debug-basic.md 6.7 KB
- references/debug-dos-program.md 7.4 KB
- references/debug-vdp.md 23 KB
- references/documentation.md 5.1 KB
- references/launch-machine.md 4.5 KB
- references/media-management.md 4.8 KB
- references/native-tcl-autodiscovery.md 3.3 KB
- references/replay-savestates.md 5.5 KB
- references/screen-capture.md 3.7 KB
- skill-environment-variables.md 3.4 KB
- skill-mcp-configuration.md 3.2 KB
- skill-mcp-resources-prompts.md 1.2 KB
- skill-tools-basic-programming.md 1.2 KB
- skill-tools-debugging.md 5.7 KB
- skill-tools-documentation-search.md 2.6 KB
- skill-tools-emulator-control.md 3.8 KB
- skill-tools-screen-capture.md 429 B
- skill-tools-vdp-video-display-processor.md 503 B
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 Changed · +1 lines f5a46009dae3
- 2mo ago First seen · 80 lines · 103 tokens per session scan A 8ec71799b1c4
mcp-openmsx-usage is a skill published in the GitHub repository nataliapc/mcp-openmsx (77 stars, last pushed 1mo ago), licensed GPL-2.0. It adds 103 tokens to every session and 1,906 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.
mcp-openmsx-usage compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| mcp-openmsx-usagenataliapc/mcp-openmsx | Skill | 77 | 1mo ago | GPL-2.0 | A | 103 | Claude Code, Codex |
| minecraft-debug-mcpmoeru-ai/airi | Skill | 51k | today | MIT | A | 68 | Codex |
| cli-anything-nsight-graphicsHKUDS/CLI-Anything | Skill | 58k | 1mo ago | Apache-2.0 | A | 29 | Claude Code, Codex |
| performance-optimizationgamedev-skills/awesome-gamedev-agent-skills | Skill | 7.8k | 11d ago | Apache-2.0 | A | 121 | Claude Code |
| unity-consoleBesty0728/Unity-Skills | Skill | 1.9k | today | MIT | A | 10 | Claude Code, Codex |
| diagnosing-bgs-problemshashgraph-online/awesome-codex-plugins | Skill | 1.5k | today | Apache-2.0 | A | 72 | Claude Code, Codex |
| scenario-unreal-gameplayscenario-labs/skills | Skill | 3.5k | yesterday | MIT | A | 121 | Claude Code |