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m05-type-driven

Encode compile-time invariants using newtypes, type-state patterns, and sealed traits.

Updated Jan 29, 2026
Search Tags:#type-safety#compile-time#newtype#type-state#builder-pattern#marker-trait#phantomdata
One-click install
npx skills add https://github.com/CallMeLuigiv2/Socratic-IDE --skill m05-type-driven-callmeluigiv2
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: m05-type-driven
Source: https://github.com/CallMeLuigiv2/Socratic-IDE/tree/main/.agents/skills/m05-type-driven
Command: npx skills add https://github.com/CallMeLuigiv2/Socratic-IDE --skill m05-type-driven-callmeluigiv2

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This skill helps developers encode invariants in the type system to prevent invalid states at compile time, reducing runtime errors and improving reliability across codebases.

Core Features & Use Cases

  • Type-safe wrappers: use newtypes to wrap primitive values for explicit semantics and safer APIs.
  • State encoding: represent valid and invalid states with the type state pattern or phantom types to enforce transitions.
  • API safety: design verified constructors and sealed traits to guarantee invariants and reduce misuse.

Quick Start

Provide a minimal example that defines a newtype UserId and a type-state Connection in Rust to illustrate compile-time invariants.

Frequently Asked Questions about m05-type-driven

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

FAQPage Schema
How do I enforce compile-time type safety for invalid state transitions?▼

Compile-time type safety is enforced by applying type-state patterns and phantom types to encode valid state transitions, catching invalid states during compilation rather than at runtime.

What is the best way to prevent primitive type misuse in API design?▼

Preventing primitive type misuse is best achieved with the newtype pattern, wrapping primitive values in type-safe wrappers to provide explicit semantics and safer domain models.

How do I use PhantomData and marker traits to guarantee invariants?▼

PhantomData and marker traits guarantee invariants by acting as compile-time placeholders to track type-state information without runtime overhead, ensuring validated API states.

Does this type-driven approach support sealed traits for library API safety?▼

Yes, sealed traits support API safety by restricting trait implementation visibility, which guarantees invariants and reduces misuse across library APIs.

When should I avoid using type-state patterns in domain modeling?▼

Avoid type-state patterns when domain models require dynamic runtime transitions or when compile-time invariant complexity introduces excessive boilerplate overhead.

How do I implement a type-safe builder pattern for verified constructors?▼

A type-safe builder pattern for verified constructors is implemented by encoding invariants in the type system, ensuring invalid configurations fail at compile time.

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