Async Expert

This is a comprehensive async programming reference that covers Python asyncio, JavaScript promises, C# async/await, and Rust futures. It leads with an anti-hallucination protocol that forces verification of async APIs before implementation, which is honestly smart given how easy it is to hallucinate non-existent event loop methods or promise combinators. The skill walks through TDD patterns for async code with real examples like parallel fetching with gather, timeout handling, and separating successes from failures. Use this when you're implementing concurrent operations, dealing with backpressure, or need patterns for error handling in async contexts. The examples are practical and it covers the footguns like blocking the event loop or resource cleanup.

skills.sh installs: 211
GitHub stars: 48
last updated: Aug 21, 2026

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Install

$ npx -y skills add martinholovsky/claude-skills-generator --skill async-expert --agent claude-code

Installs into .claude/skills of the current project.

Files

Asynchronous Programming Expert

0. Anti-Hallucination Protocol

🚨 MANDATORY: Read before implementing any code using this skill

Verification Requirements

When using this skill to implement async features, you MUST:

Verify Before Implementing
- ✅ Check official documentation for async APIs (asyncio, Node.js, C# Task)
- ✅ Confirm method signatures match target language version
- ✅ Validate async patterns are current (not deprecated)
- ❌ Never guess event loop methods or task APIs
- ❌ Never invent promise/future combinators
- ❌ Never assume async API behavior across languages
Use Available Tools
- 🔍 Read: Check existing codebase for async patterns
- 🔍 Grep: Search for similar async implementations
- 🔍 WebSearch: Verify APIs in official language docs
- 🔍 WebFetch: Read Python/Node.js/C# async documentation
Verify if Certainty < 80%
- If uncertain about ANY async API/method/pattern
- STOP and verify before implementing
- Document verification source in response
- Async bugs are hard to debug - verify first