Haskell Skills

Comprehensive Agent Skills for professional Haskell development and code review. Built by senior Haskell developers and community leaders with years of production Haskell experience, these skills encode the patterns, practices, and hard-won knowledge that define modern, industrial-strength Haskell.

Skills

This repository contains two complementary skills:

haskell-coder

Expert Haskell development skill. Gives any compatible coding agent deep expertise in Haskell programming, from project setup through production deployment. It reflects the way experienced Haskell engineers actually write code: type-driven, pragmatic, and grounded in real-world tradeoffs.

The skill follows a progressive disclosure architecture. The main SKILL.md provides immediately actionable guidance (~420 lines), while seven deep-dive reference documents cover advanced topics agents can load on demand.

Covers:

• Project setup and structure (Cabal 3.0)
• Essential GHC extensions (categorized: always-on, use-freely, avoid-unless-needed)
• Type-driven development patterns (newtypes, phantom types, smart constructors)
• Error handling
• Testing with HSpec and QuickCheck
• Performance essentials (strictness, profiling, space leak prevention)
• Common gotchas that trip up even intermediate Haskellers
• Key library recommendations across 18 packages
• Commands reference for the full build/test/profile lifecycle

Reference Documents:

haskell-reviewer

Haskell code review skill. Reviews code for correctness, idiomatic style, performance pitfalls, and adherence to best practices. Covers totality, type safety, strictness, GHC extension usage, testing, and build configuration.

Installation

Claude Code

Add individual skills as dependencies in your project’s .claude/settings.json:

{
  "skills": [
    "github:mightybyte/haskell-skill/haskell-coder",