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 jeffreytse/grimoire-core --skill calculate-tire-wear-assessmentgit clone --depth 1 https://github.com/jeffreytse/grimoire-coreWrote 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/jeffreytse/grimoire-core/calculate-tire-wear-assessment)<a href="https://agentmods.dev/skills/jeffreytse/grimoire-core/calculate-tire-wear-assessment"><img src="https://agentmods.dev/badge/skills/jeffreytse/grimoire-core/calculate-tire-wear-assessment/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/jeffreytse/grimoire-core/calculate-tire-wear-assessment"><img src="https://agentmods.dev/badge/skills/jeffreytse/grimoire-core/calculate-tire-wear-assessment.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 | $0.00040 | $0.01353 |
| Opus 5 | $0.00020 | $0.00677 |
| Sonnet 5 | $0.00008 | $0.00271 |
| Haiku 4.5 | $0.00004 | $0.00135 |
Grade A, and why
calculate-tire-wear-assessment 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 12d 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 — 88 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Calculate Tire Wear Assessment
Measure tread depth, interpret wear pattern type, calculate remaining safe life, and determine whether tires require immediate replacement using NHTSA safety thresholds and systematic wear pattern diagnosis.
Why This Is Best Practice
Why best: Tread depth thresholds and systematic wear-pattern diagnosis catch both the immediate safety risk (inadequate wet-traction) and the root cause (alignment, inflation, suspension) — replacing tires without fixing the cause just repeats the failure. Adopted by: NHTSA (National Highway Traffic Safety Administration) mandates minimum 2/32" tread depth in the US; EU regulations require 1.6mm (≈2/32"). AAA recommends proactive replacement at 4/32" for wet-weather safety. Fleet operators (UPS, FedEx, airline ground vehicles) use systematic tire assessment schedules to prevent blowout-related incidents. Impact: NHTSA data shows tires contribute to ~664 fatal crashes annually in the US — most due to worn tread, under-inflation, or damage. Wet stopping distance at 4/32" tread is 50% longer than at 8/32"; at 2/32" it doubles relative to new tires. Beyond safety, misidentifying the cause of uneven wear leads to repeat failure — worn tires are a symptom; the root cause (alignment, inflation, suspension) must also be corrected.
Steps
1. Measure tread depth
Tread depth gauge (most accurate): insert probe into tread groove at the shallowest point; read in 32nds of an inch (US) or mm (EU).
Penny test (emergency check): insert a US penny (Lincoln head down) into the tread. If you see the top of Lincoln's head, tread is ≤2/32" — replace immediately.
Quarter test: insert a US quarter (Washington head down). If you see the top of Washington's head, tread is ≤4/32" — replace soon; wet-weather performance is significantly compromised.
New tire tread depth: typically 10/32" to 11/32" for passenger; 14/32" for light truck.
Measure at 3 points across the tread width (inner, center, outer) and at 4 locations around the circumference. Record all measurements.
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.
- 12d ago First seen · 88 lines · 40 tokens per session scan A 8c4ede507b9f
calculate-tire-wear-assessment is a skill published in the GitHub repository jeffreytse/grimoire-core (4 stars, last pushed 24d ago), licensed MIT. It adds 40 tokens to every session and 1,353 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 2026-08-31.
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