What is Ultrawork in Claude Code?

Ultrawork is a parallel execution engine that allows Claude to run multiple independent tasks simultaneously using different AI models to speed up development workflows.

What is the difference between Ultrawork and Ralph?

Ultrawork is the parallelism layer focused on speed. Ralph is a wrapper that adds session persistence and comprehensive verification loops on top of Ultrawork.

How does Ultrawork handle different task complexities?

It uses intelligent routing to send simple tasks to Haiku, standard work to Sonnet, and complex analysis to Opus, optimizing both speed and cost.

Can Ultrawork run long-running commands?

Yes, it uses a background execution mode for operations over 30 seconds, such as package installations, builds, or full test suites, allowing other tasks to continue in the foreground.

Ultrawork Parallel Execution Engine

Name: Ultrawork Parallel Execution Engine
Author: Moliboy5000

byMoliboy5000

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生产力与工作流

Accelerates development workflows by executing multiple independent tasks simultaneously through intelligent agent routing and model tiering.

Ultrawork is a specialized performance engine for Claude Code designed to maximize throughput by parallelizing independent tasks. It acts as a sophisticated orchestrator that classifies tasks by complexity and routes them to the most efficient model tiers—using Haiku for simple updates, Sonnet for standard implementations, and Opus for complex analysis. By leveraging background execution for long-running operations like builds or tests while maintaining foreground progress for quick checks, Ultrawork significantly reduces total execution time without sacrificing code quality or incurring unnecessary token costs.

主要功能

01Lightweight Verification: Automatically checks that builds pass and no new errors are introduced.

02Background Task Management: Executes long-running builds, installs, and tests in the background.

03Intelligent Model Routing: Automatically assigns tasks to the optimal model tier based on complexity.

04Parallel Agent Execution: Runs multiple independent sub-agents simultaneously to reduce wait times.

05Dynamic Task Classification: Identifies dependencies to determine which operations can safely run in parallel.

060 GitHub stars

使用场景

01Optimizing token costs by routing trivial code fixes to smaller, faster models like Haiku.

02Simultaneously updating documentation, adding type exports, and implementing API endpoints.

03Running a full test suite in the background while performing UI refactoring in the foreground.

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add moliboy5000/.claude ultrawork

For use in Claude.ai and ChatGPT