Which programming languages does this skill support?

The auditor specifically supports Python (asyncio), Node.js, and Rust (Tokio) for detecting asynchronous anti-patterns and general runtime performance issues.

What kind of 'Blocking IO' does it detect?

It scans for synchronous file operations (like fs.readFileSync), network requests (like requests.get), and subprocess calls inside asynchronous function blocks that would otherwise stall the event loop.

Does this skill automatically fix performance issues?

No, this skill is a reporting tool. It identifies violations and provides specific recommendations, allowing developers to review and implement the most appropriate fixes manually.

How is the compliance score calculated?

The skill uses a standardized penalty algorithm that weights findings by severity (High, Medium, Low) and frequency to produce a final score out of 10.

Runtime Performance Auditor

Name: Runtime Performance Auditor
Author: levnikolaevich

bylevnikolaevich

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147

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Analytics & Monitoring

Identifies runtime performance bottlenecks and async anti-patterns to optimize application execution and resource efficiency.

The Runtime Performance Auditor is a specialized L3 worker skill designed to perform deep analysis of runtime performance risks within your codebase. It specifically targets high-impact anti-patterns such as blocking I/O operations inside asynchronous functions, synchronous sleep calls that freeze event loops, and inefficient memory allocations like redundant data copies or string concatenation in loops. By providing structured reports with severity ratings, location details, and clear remediation steps, it enables developers to maintain high-concurrency standards and optimal resource utilization in Python, Node.js, and Rust environments.

Key Features

01Detects blocking I/O and synchronous sleep calls within async contexts

02Analyzes loop-based string concatenation for performance risks

03Generates detailed reports with severity levels and compliance scores

04147 GitHub stars

05Flags CPU-bound tasks that should be offloaded to worker threads

06Identifies inefficient memory allocations and redundant data copies

Use Cases

01Auditing high-concurrency API handlers to prevent event loop blocking

02Establishing performance quality gates during the code review process

03Optimizing data processing scripts for better memory and CPU efficiency

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add levnikolaevich/claude-code-skills ln-653-runtime-performance-auditor

For use in Claude.ai and ChatGPT

Download Skill