polymorphic-effects

Name: polymorphic-effects
Availability: InStock
Author: rainoftime

Explains polymorphic effects and algebraic effect handlers for advanced programming language research and development.

17|2|Updated Feb 16, 2026

Search Tags:#handlers #functional-programming #effects #polymorphism #algebraic-effects #type-systems

Ready to run

npx skills add https://github.com/rainoftime/pl-skills --skill polymorphic-effects

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: polymorphic-effects
Source: https://github.com/rainoftime/pl-skills/tree/main/polymorphic-effects
Command: npx skills add https://github.com/rainoftime/pl-skills --skill polymorphic-effects

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill requires bidirectional-type-checking, and includes references (resource) and scripts (resource) components.

What problem does it solve?

This Skill addresses the complexity of managing side effects in programming languages by providing expertise in effect systems and effect polymorphism, enabling more robust and composable code.

Core Features & Use Cases

Effect System Design: Understand and implement advanced effect type systems.
Handler Implementation: Develop and compose effect handlers for various computational effects.
Use Case: Designing a new programming language feature that requires sophisticated handling of I/O, state, and exceptions in a type-safe and extensible manner.

Quick Start

Explain the concept of effect rows in algebraic effects.

Frequently Asked Questions about polymorphic-effects

High-intent search queries and answers about installing and using this skill.

FAQPage Schema

What are algebraic effects and effect handlers in type systems?▼

Algebraic effects are a programming language feature that allows composable handling of side effects. Effect handlers provide a structured way to manage computational effects like I/O, state, and exceptions in a type-safe manner.

How do I implement effect polymorphism and row typing in OCaml or Haskell?▼

Effect polymorphism and row typing are implemented by tracking effect rows in the type system to safely infer side effects. This Skill provides expertise in designing these advanced type systems for languages like OCaml and Haskell.

How do effect rows work for managing side effects in functional programming?▼

Effect rows group multiple computational effects into a single type record, allowing functions to specify exactly which side effects they perform. This mechanism enables robust, composable code by tracking effect polymorphism across function calls.

Do I need bidirectional type checking to implement an effect system?▼

Bidirectional type checking is a prerequisite dependency for this Skill. It provides the foundational type inference mechanism needed to effectively implement and reason about advanced polymorphic effect systems and handler polymorphism.

What is the best way to design a type-safe effect system for a new programming language?▼

The best approach is leveraging effect inference and handler polymorphism to manage I/O, state, and exceptions extensibly. This Skill offers theoretical foundations and practical guidance for designing sophisticated effect type systems.

Why does handler polymorphism matter for composable functional programming?▼

Handler polymorphism allows different effect handlers to be interchanged without altering the underlying code logic. This ensures computational effects remain modular and composable, solving the complexity of managing side effects in advanced type systems.