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effect-v4-cli

Guide Effect v4 CLI builds with effect/unstable/cli and process modules.

2|Updated Jul 2, 2026
Search Tags:#typescript#architecture#cli#process#node#effect
One-click install
npx skills add https://github.com/spencerbeggs/effected --skill effect-v4-cli
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: effect-v4-cli
Source: https://github.com/spencerbeggs/effected/tree/main/plugin/skills/effect-v4-cli
Command: npx skills add https://github.com/spencerbeggs/effected --skill effect-v4-cli

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This skill resolves the architectural confusion and dependency conflicts inherent in porting or building command-line tools for the Effect v4 ecosystem, where traditional CLI packages are deprecated or incompatible.

Core Features & Use Cases

  • Framework Guidance: Provides the correct mapping from deprecated v3 packages to the new core-integrated modules like effect/unstable/cli and effect/unstable/process.
  • Architectural Best Practices: Defines the strict separation between pure libraries and integrated CLI packages, ensuring proper dependency management and exit-code contracts.
  • Use Case: Use this skill when you need to implement a new CLI tool that requires file system access, process spawning, or terminal interaction while maintaining strict type safety and avoiding the common pitfalls of the v3-to-v4 transition.

Quick Start

Ask the assistant to explain the correct implementation of a Command environment for a new CLI tool using the effect v4 core modules.

Frequently Asked Questions about effect-v4-cli

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

FAQPage Schema
How do I build a type-safe CLI using Effect v4 core modules?▼

Build a type-safe CLI using Effect v4 by utilizing the effect/unstable/cli module for command structures and effect/unstable/process for child process management, ensuring strict exit-code contracts and proper service layer provision for Node.js environments.

Why does my @effect/cli package break when upgrading to Effect v4?▼

The @effect/cli package breaks during an Effect v4 upgrade because traditional CLI packages are deprecated and incompatible. Migrate architectural implementations to the new core-integrated effect/unstable/cli module to resolve dependency conflicts.

What is the correct way to manage child processes in an Effect v4 CLI?▼

Manage child processes in an Effect v4 CLI by using the effect/unstable/process module. This core-integrated module ensures proper child process management and service layer provision within Node.js environments.

How do I enforce strict exit-code contracts in a Node.js CLI built with Effect?▼

Enforce strict exit-code contracts in a Node.js CLI by applying Effect v4 architectural best practices. Define strict separation between pure libraries and integrated CLI packages to ensure proper process termination and service layer provision.

Can I use Effect v4 for command-line tools that require file system access and terminal interaction?▼

Yes, use Effect v4 for command-line tools requiring file system access and terminal interaction. The framework provides core-integrated modules that maintain strict type safety while avoiding common v3-to-v4 transition pitfalls.

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