Dinero.js is a JavaScript and TypeScript library for representing, calculating, comparing, converting, and formatting monetary values. Applications use it to handle currencies and amounts with immutable operations, configurable numeric precision, and support for currencies with non-decimal subdivisions. Its catalogue skills guide coding agents in using the library.
Borrowing it
Nothing to install: this file belongs to dinerojs/dinero.js. 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/dinerojs/dinero.js/main/.agents/skills/dinero-currency-patterns/SKILL.mdgit clone --depth 1 https://github.com/dinerojs/dinero.jsWrote 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/dinerojs/dinero.js/dinero-currency-patterns)<a href="https://agentmods.dev/skills/dinerojs/dinero.js/dinero-currency-patterns"><img src="https://agentmods.dev/badge/skills/dinerojs/dinero.js/dinero-currency-patterns/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/dinerojs/dinero.js/dinero-currency-patterns"><img src="https://agentmods.dev/badge/skills/dinerojs/dinero.js/dinero-currency-patterns.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00071 | $0.00572 |
| Opus 5 | $0.00036 | $0.00286 |
| Sonnet 5 | $0.00014 | $0.00114 |
| Haiku 4.5 | $0.00007 | $0.00057 |
Grade A, and why
dinero-currency-patterns 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 11d 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.
Copies of this mod
1 near-identical copy found in the catalogue:
- dinero-currency-patterns — 100% identical, 0 lines differ
How it starts
The opening of the file, as written. The whole thing — 75 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Dinero.js Currency Patterns
Patterns for handling currencies with Dinero.js: type safety, conversions, custom currencies, database storage, and payment service integration.
When to Apply
Reference these guidelines when:
- Converting between currencies with
convert - Defining custom currencies (e.g., cryptocurrencies, loyalty points)
- Looking up currencies dynamically from external input
- Storing monetary values in a database
- Integrating with payment services (Stripe, PayPal, Square)
Rule Categories by Priority
| Priority | Category | Impact | Prefix |
|---|---|---|---|
| 1 | Type Safety | HIGH | types- |
| 2 | Conversion | HIGH | convert- |
| 3 | Storage | HIGH | storage- |
| 4 | Payment Integration | MEDIUM | payment- |
Quick Reference
1. Type Safety (HIGH)
types-as-const- Define custom currencies withas const satisfiesfor compile-time safetytypes-currency-mismatch- TypeScript catches currency mismatches in operations at compile timetypes-lookup-validation- Validate currency codes from external sources at runtime
2. Conversion (HIGH)
convert-scaled-rates- Use scaled amounts for fractional exchange rates, not floatsconvert-reusable- Build reusable converter functions with higher-order patterns
3. Storage (HIGH)
storage-database- Store amount, currency code, and scale as separate columnsstorage-no-money-type- Avoid PostgreSQL'smoneytype for multi-currency applications
4. Payment Integration (MEDIUM)
payment-services- Map Dinero objects to payment service formats with dedicated helpers
How to Use
Read individual rule files for detailed explanations and code examples:
rules/types-as-const.md
rules/convert-scaled-rates.md
Each rule file contains:
- Brief explanation of why it matters
- Incorrect code example with explanation
- Correct code example with explanation
- Additional context and references
What ships with it
8 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.
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.
- 11d ago First seen · 75 lines · 71 tokens per session scan A 46c8f62ca371
dinero-currency-patterns is a skill published in the GitHub repository dinerojs/dinero.js (6,792 stars, last pushed today), licensed MIT. It adds 71 tokens to every session and 572 once invoked, about $0.0004 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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