patterns

Name: patterns
Availability: InStock
Author: Outfitter

Document Outfitter Stack handler contracts, Result<T, E> types, and error taxonomy.

6|1|Updated Jan 22, 2026

Search Tags:#typescript #patterns #result types #outfitter #handler contract #error taxonomy

Ready to run

npx skills add https://github.com/outfitter-dev/outfitter --skill patterns-outfitter-dev

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: patterns
Source: https://github.com/outfitter-dev/outfitter/tree/main/packages/claude-plugin/skills/patterns
Command: npx skills add https://github.com/outfitter-dev/outfitter --skill patterns-outfitter-dev

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

This Skill provides a comprehensive reference for understanding and implementing the core patterns and conventions of the Outfitter Stack, ensuring consistency and best practices across projects.

Core Features & Use Cases

Handler Contract: Learn the standard signature and principles for writing pure, transport-agnostic handlers.
Result Types: Understand how to use Result<T, E> for explicit and safe error handling.
Error Taxonomy: Familiarize yourself with the predefined error categories for consistent error reporting and handling.
Use Case: When building a new feature or debugging an existing one, consult this Skill to ensure your handlers adhere to the Outfitter Stack's design principles, making your code more maintainable and testable.

Quick Start

Refer to the Outfitter Stack patterns documentation to understand handler contracts and result types.

Frequently Asked Questions about patterns

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

FAQPage Schema

How do I handle errors in TypeScript using Result types?▼

To handle errors using Result types, return a `Result<T, E>` object from pure functions instead of throwing exceptions. This explicit error management approach ensures safe, transport-agnostic handling within the Outfitter Stack conventions.

What is the handler contract for pure functions in the Outfitter Stack?▼

The handler contract defines a standard signature for writing pure, transport-agnostic functions. These handlers avoid side effects, ensuring code remains maintainable and testable across different Outfitter Stack projects.

How does the Outfitter error taxonomy classify errors?▼

The Outfitter error taxonomy uses a standardized ten-category classification system. This predefined structure ensures consistent error reporting and handling across the ecosystem for AI-agent-ready tools.

Can I use Outfitter Stack patterns for building AI-agent-ready tools?▼

Yes, the patterns are essential for developers building AI-agent-ready tools within the Outfitter ecosystem. They provide the necessary handler contracts and error taxonomy to ensure consistent, reliable agent interactions.

What's the best way to structure pure functions for transport-agnostic handlers?▼

The best way to structure pure functions is to follow the Outfitter handler contract, ensuring they remain transport-agnostic. Functions should return `Result<T, E>` for explicit error management without relying on exceptions.

Why does my TypeScript handler need a standardized error taxonomy?▼

A standardized error taxonomy is needed to provide consistent error reporting across the Outfitter ecosystem. The ten-category system allows AI-agents and developers to reliably interpret and handle failure states.