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 agentmods add skills/typefox/agent-skills/arithmetics-dslnpx skills add TypeFox/agent-skills --skill arithmetics-dslgit clone --depth 1 https://github.com/TypeFox/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/typefox/agent-skills/arithmetics-dsl)<a href="https://agentmods.dev/skills/typefox/agent-skills/arithmetics-dsl"><img src="https://agentmods.dev/badge/skills/typefox/agent-skills/arithmetics-dsl.svg" alt="Measured on agentmods" 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 | $0.00054 | $0.00283 |
| Opus 5 | $0.00027 | $0.00142 |
| Sonnet 5 | $0.00011 | $0.00057 |
| Haiku 4.5 | $0.00005 | $0.00028 |
Grade A, and why
arithmetics-dsl 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 5d 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
Arithmetics DSL
A little calculator language. A file is a module that contains some definitions and some expressions to evaluate.
Basics
Start a file with a module declaration:
module myCalc
After that you can write definitions and evaluations. A definition gives a name to a value or a function, and an evaluation is just an expression that gets computed.
def a: 5;
def b: 3;
def c: a + b;
a + c;
Functions take parameters in parentheses:
def square(x): x * x;
square(4);
Statements end with a semicolon.
Expressions
Expressions support the usual arithmetic operators — addition, subtraction, multiplication, division, power, and modulo. You can use parentheses to group things. Operators follow normal math precedence, so multiplication binds tighter than addition and so on.
Numbers can be integers or decimals.
Notes
- You can call other functions inside a definition, including building functions on top of other functions.
- Symbol names are fairly flexible.
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.
- 5d ago First seen · 52 lines · 54 tokens per session scan A 967db6715499
arithmetics-dsl is a skill published in the GitHub repository TypeFox/agent-skills (5 stars, last pushed 2d ago), licensed MIT. It adds 54 tokens to every session and 283 once invoked, about $0.0003 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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