nw-fp-kotlin SKILL.md skillA
nw-fp-kotlin from nwave-ai/nwave is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add nwave-ai/nwave/nw-fp-kotlin@git:20260829.e97726aPins git:20260829.e97726a in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- nwave-ai/nwave
- Path
nWave/skills/nw-fp-kotlin/SKILL.md- Versions recorded
- 5
- Latest version
- git:20260829.e97726a, committed Aug 29, 2026
- First version recorded
- Mar 17, 2026
- Size
- 7,045 bytes
- Repository stars
- 633
- License
- MIT
Kotlin language-specific patterns with Arrow, Raise DSL, and coroutine-based effects.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# FP in Kotlin -- Functional Software Crafter Skill
Cross-references: [fp-principles](../nw-fp-principles/SKILL.md) | [fp-domain-modeling](../nw-fp-domain-modeling/SKILL.md) | [property-based-testing](../nw-property-based-testing/SKILL.md)
## When to Choose Kotlin
- Best for: gentlest FP onboarding for Java teams | Android | coroutines | pragmatic FP with great IDE support
- Not ideal for: teams wanting compiler-enforced purity | full effect systems | higher-kinded type abstractions
## [STARTER] Quick Setup
```bash
mkdir order-service && cd order-service
gradle init --type kotlin-application --dsl kotlin
# Add arrow-core, arrow-fx-coroutines, kotest-property to build.gradle.kts
./gradlew build && ./gradlew test
```
## [STARTER] Type System for Domain Modeling
### Choice Types (Sealed Hierarchies)
```kotlin
sealed interface PaymentMethod {
data class CreditCard(val cardNumber: String, val expiryDate: String) : PaymentMethod
data class BankTransfer(val accountNumber: String) : PaymentMethod
data object Cash : PaymentMethod
}
```
Exhaustive `when` expressions ensure all cases handled.
### Record Types and Domain Wrappers
```kotlin
data class Customer(
…Read the whole file at its exact version.
How to install
mdr add nwave-ai/nwave/nw-fp-kotlin@sha256:5ead12e957e88035The line at the top of this page pins the label git:20260829.e97726a, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_oou53uteywznwbz4)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 5 versions of this file, between Mar 17, 2026 and Aug 29, 2026, about one every 41 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260829.e97726a latest | 2026-08-29 | e97726a | 7,045 B | A | view · diff |
| git:20260407.2d944b1 | 2026-04-07 | 2d944b1 | 6,985 B | A | view · diff |
| git:20260320.d98f3cb | 2026-03-20 | d98f3cb | 6,945 B | A | view · diff |
| git:20260318.e6a0e19 | 2026-03-18 | e6a0e19 | 6,923 B | A | view · diff |
| git:20260317.1d16147 | 2026-03-17 | 1d16147 | 6,914 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (7045 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
nwave-ai/nwave · 633 stars · license MIT · pushed 2026-11-07 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_oou53uteywznwbz4 GET https://markdownregistry.com/api/v1/resolve?ref=nwave-ai/nwave/nw-fp-kotlin GET https://markdownregistry.com/api/v1/blob/5ead12e957e880356bda030ef52ce5c7bbe86c66fdd4d4539082a403e518eb8a
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.