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 hamzabellouch/agent-skills --skill moment-inertiagit clone --depth 1 https://github.com/hamzabellouch/agent-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/hamzabellouch/agent-skills/moment-inertia)<a href="https://agentmods.dev/skills/hamzabellouch/agent-skills/moment-inertia"><img src="https://agentmods.dev/badge/skills/hamzabellouch/agent-skills/moment-inertia/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/hamzabellouch/agent-skills/moment-inertia"><img src="https://agentmods.dev/badge/skills/hamzabellouch/agent-skills/moment-inertia.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 | $0.00030 | $0.00314 |
| Opus 5.5 | $0.00012 | $0.00126 |
| Sonnet 5.5 | $0.00006 | $0.00063 |
| Haiku 4.5 | $0.00003 | $0.00031 |
Grade A, and why
moment-inertia 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 7d 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.
What it actually says
Moment of Inertia
ID: mech.rotation.moment_of_inertia
Domain: Mechanics → Rotation
Difficulty: 3/5
Prerequisites
- mech.rotation.angular_kinematics
Core Concepts
- moment of inertia
- rotational inertia
- continuous bodies
- standard shapes
Key Equations
$$ I = \sum m_i r_i^2 $$ $$ I = \int r^2,dm $$ $$ I_{disk} = \tfrac12 MR^2 $$ $$ I_{sphere} = \tfrac25 MR^2 $$
Methods
- Choose the axis
- Integrate r^2 dm using symmetry
- Use standard results for common shapes
Typical Problem Types
- I for a rod, disk, sphere, hoop
- Composite bodies
Common Pitfalls
- Using I about the wrong axis
- Forgetting that I depends on mass distribution
Related Skills
- mech.rotation.parallel_axis
- mech.rotation.rot_energy
References
- Serway Ch.10
- Kleppner & Kolenkow Ch.6
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.
- 7d ago First seen · 60 lines · 30 tokens per session scan A db33e84eb560
moment-inertia is a skill published in the GitHub repository hamzabellouch/agent-skills (8 stars, last pushed today), licensed MIT. It adds 30 tokens to every session and 314 once invoked, about $0.0001 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 2026-10-10.
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