Partial Function (Grade A)Security-tested data-ai skill for Claude AI. Grade A. Avoid partial functions such as head, fromJust, read, and (!!) in Haskell. Prefer total functions, Maybe-returning variants, and other safe altern

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Reviewed by Daniel Nikulshyn·Updated July 2026

Overview

This skill for Claude AI aims to prevent the use of partial functions in Haskell, which can throw exceptions for certain inputs despite being pure functions. Partial functions appear to accept all inputs type-wise but only work correctly for some, leading to runtime crashes even if they pass type checking. The skill promotes the use of total functions, Maybe-returning variants, and other safe alternatives when writing or reviewing Haskell code that involves list access, string parsing, or Maybe handling.

Key features

Detects and flags partial functions such as head, fromJust, read, and (!!)
Suggests safe alternatives like total functions, Maybe-returning variants, and NonEmpty types
Supports robust error handling through Maybe and Either types

Pricing

Model: Free
Category: Skills
Rating: No reviews yet

Use cases

Code Review

Use this skill during code reviews to identify and replace partial functions with safer alternatives, ensuring the codebase is more robust and less prone to runtime exceptions.

Haskell Development

Integrate this skill into your Haskell development workflow to write safer code from the start, avoiding partial functions and opting for total functions or safe variants that handle errors explicitly.

Pros & Cons

Pros

Encourages safe coding practices by avoiding partial functions
Helps prevent runtime crashes due to unhandled exceptions
Promotes the use of total functions and Maybe-returning variants for robust error handling

Cons

May require additional code for handling safe alternatives
Could potentially limit the expressiveness of code by avoiding partial functions

Reviews

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Q&A

Is the skill limited to certain Haskell versions or libraries?

The skill focuses on standard functions found in core libraries (Prelude, Data.List, etc.). It recommends alternatives that are available in common libraries, such as `readMaybe` from `Text.Read` and `NonEmpty` from `Data.List.NonEmpty`.

Asked by Robert Ainsworth · Dec 21, 2025

Does using the skill add significant code overhead?

While it may require additional handling for Maybe or Either types, the trade‑off is reduced runtime exceptions. The skill recommends clear patterns (e.g., listToMaybe, fromMaybe, headMay) that keep code readable without excessive boilerplate.

Asked by Tunde Balogun · Dec 11, 2025

Can the skill be integrated into existing Haskell projects?

Yes, the skill is designed for use with Claude AI and can be invoked during code review or writing sessions to analyze Haskell code, making it suitable for projects that already use Haskell and want to enforce safe coding practices.

Asked by Kenji Watanabe · Dec 3, 2025

How does the Partial Function skill improve Haskell code safety?

It detects and flags common partial functions like head, fromJust, read, and (!!), then suggests safer alternatives such as total functions, Maybe-returning variants, and NonEmpty types, helping prevent runtime crashes and improve error handling.

Asked by Jovana Petrovic · Sep 18, 2025

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Free

Overview

Key features

Pricing

Use cases

Code Review

Haskell Development

Pros & Cons

Pros

Cons

Reviews

Q&A

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