An expert-level skill for building, debugging, and optimizing production-grade Haskell applications with a focus on type safety and purity.
Install & Download
1. ClawHub CLI
The fastest way to install a skill directly from the registry.
npx clawhub@latest install haskell
2. Manual Installation
Copy the skill folder to one of these locations
~/.openclaw/skills/ <project>/skills/ Priority: Workspace > Local > Bundled
3. Prompt Installation
Copy this prompt to OpenClaw to install it automatically.
Help me install haskell using Clawhub. If Clawhub is not installed, install it first (npm i -g clawhub).
Prefer to download?
Get the raw skill files in a ZIP archive.
What is Haskell Development?
Haskell is a purely functional programming language that prioritizes correctness and performance through its advanced type system. By leveraging this tool within the Openclaw Skills framework, developers can ensure that illegal states are unrepresentable and side effects are explicitly managed. This skill provides a comprehensive roadmap for AI agents to navigate the modern Haskell ecosystem, covering everything from core philosophies like laziness and composition to practical implementation details involving GHC extensions and Nix-based builds. It serves as a technical bridge for creating robust software where types serve as the primary design specification.
Haskell Development Use Cases
- Initializing new Haskell projects using Cabal and Nix for reproducible environments.
- Implementing domain-driven design through advanced type-level programming and phantom types.
- Refactoring legacy code to use modern Haskell practices like the ReaderT pattern and Optics.
- Debugging complex space leaks and performance bottlenecks using GHC profiling tools.
- Developing type-safe APIs and database layers with libraries like servant or postgresql-simple.
How Haskell Development Works
- The agent analyzes the project requirements to define a core domain model using Haskell's algebraic data types.
- A project scaffold is generated using Openclaw Skills standards, typically involving a
.cabalconfiguration with curated GHC extensions. - Pure logic is implemented in the library section, ensuring that side effects are isolated within the IO monad or managed via effect patterns.
- Tests are written using HSpec for behavior-driven development and QuickCheck for property-based verification.
- The code is built and optimized using Cabal, with optional Nix integration for dependency management.
Haskell Development Setup
To start a new project with this skill, ensure you have GHC and Cabal installed (ideally via GHCup). Execute the following commands:
mkdir my-haskell-project && cd my-haskell-project
cabal init --interactive
Ensure your .cabal file includes recommended default extensions like DeriveGeneric, LambdaCase, and ScopedTypeVariables to align with modern development standards.
Haskell Development Data Schema & Taxonomy
The skill follows a standard Haskell project hierarchy to ensure maintainability and compatibility with build tools:
| Directory | Purpose |
|---|---|
app/ |
Contains the executable entry point (Main.hs). |
src/ |
Library source code including types, API, and logic. |
test/ |
Test suites using HSpec, QuickCheck, or Tasty. |
*.cabal |
Package metadata and dependency configuration. |
cabal.project |
Multi-package project configuration. |
Internal/ |
Implementation details not exported to the public API. |
Haskell Development Advanced Features
- Multi-agent support for concurrent development of frontend (Miso/Reflex) and backend Haskell services.
- Deep integration with Nix for hermetic builds and development shells.
- Automated linting and code style enforcement using HLint and stylish-haskell.
- Advanced error handling strategies utilizing MonadError and custom exception hierarchies.
- Performance-first optimizations including strictness analysis and bang patterns to prevent space leaks.
SKILL.md
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