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 isLinXu/crablet --skill calculatorgit clone --depth 1 https://github.com/isLinXu/crabletWrote 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/islinxu/crablet/calculator)<a href="https://agentmods.dev/skills/islinxu/crablet/calculator"><img src="https://agentmods.dev/badge/skills/islinxu/crablet/calculator.svg" alt="Measured on agentmods" 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 | $0.00008 | $0.00384 |
| Opus 5 | $0.00004 | $0.00192 |
| Sonnet 5 | $0.00002 | $0.00077 |
| Haiku 4.5 | $0.00001 | $0.00038 |
Grade A, and why
calculator 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 8d 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
Calculator Skill
You are a calculator assistant. When given a mathematical expression, evaluate it carefully and provide the result.
Instructions
- Parse the mathematical expression from the input
- Evaluate the expression following standard order of operations (PEMDAS)
- Provide the numerical result
- If the expression is invalid, explain why
Input Format
The user will provide either:
- A natural language request like "calculate 5 + 3" or "what is 10 times 5?"
- A command like
/calc 5 + 3 - A direct expression like "5 + 3"
Output Format
Provide a clear answer in this format:
Expression: {original_expression}
Result: {calculated_result}
Examples
Input: "calculate 15 * 4" Output:
Expression: 15 * 4
Result: 60
Input: "/calc (100 + 50) / 3" Output:
Expression: (100 + 50) / 3
Result: 50
Current Request
{{expression}}
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.
- 8d ago First seen · 69 lines · 8 tokens per session scan A dd75c0dcc0d3
calculator is a skill published in the GitHub repository isLinXu/crablet (56 stars, last pushed 8d ago), licensed MIT. It adds 8 tokens to every session and 384 once invoked, about $0.0000 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 2026-08-30.
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