nw-fp-fsharp SKILL.md skillA
nw-fp-fsharp 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-fsharp@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-fsharp/SKILL.md- Versions recorded
- 5
- Latest version
- git:20260829.e97726a, committed Aug 29, 2026
- First version recorded
- Mar 17, 2026
- Size
- 7,382 bytes
- Repository stars
- 633
- License
- MIT
F# language-specific patterns, Railway-Oriented Programming, and Computation Expressions.
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 F# -- 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 F#
- Best for: domain modeling on .NET | DDD | railway-oriented programming | pipeline-first design | finance
- Not ideal for: teams needing higher-kinded types | non-.NET platforms | large existing C# codebases resistant to change
## [STARTER] Quick Setup
```bash
dotnet new console -lang F# -o OrderService && cd OrderService
dotnet new xunit -lang F# -o OrderService.Tests
dotnet add OrderService.Tests reference OrderService
dotnet add OrderService.Tests package FsCheck.Xunit
dotnet test
```
**File order matters**: F# compiles files top-to-bottom as listed in `.fsproj`. Types must be defined before use.
## [STARTER] Type System for Domain Modeling
### Choice Types (Discriminated Unions)
```fsharp
type PaymentMethod =
| CreditCard of cardNumber: string * expiryDate: string
| BankTransfer of accountNumber: string
| Cash
```
### Record Types and Domain Wrappers
```fsharp
type Customer = {
…Read the whole file at its exact version.
How to install
mdr add nwave-ai/nwave/nw-fp-fsharp@sha256:56bf18d4ab674fbfThe 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_27dg5yo7kz7aqs57)
3 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 | 7,382 B | A | view · diff |
| git:20260407.2d944b1 | 2026-04-07 | 2d944b1 | 7,334 B | A | view · diff |
| git:20260320.d98f3cb | 2026-03-20 | d98f3cb | 7,294 B | A | view · diff |
| git:20260318.e6a0e19 | 2026-03-18 | e6a0e19 | 7,272 B | A | view · diff |
| git:20260317.1d16147 | 2026-03-17 | 1d16147 | 7,263 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 (7382 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_27dg5yo7kz7aqs57 GET https://markdownregistry.com/api/v1/resolve?ref=nwave-ai/nwave/nw-fp-fsharp GET https://markdownregistry.com/api/v1/blob/56bf18d4ab674fbf4920181923af07802d4a16d0103c6e5e4ecce03408eaec77
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.