locate-fault

Trace code paths and predict root causes of failing tests.

5|Updated Mar 4, 2026

Search Tags:#code analysis #debugging #bug fix #test failure #fault localization

Ready to run

npx skills add https://github.com/nicholls-inc/claude-code-marketplace --skill locate-fault

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: locate-fault
Source: https://github.com/nicholls-inc/claude-code-marketplace/tree/main/crosscheck/skills/locate-fault
Command: npx skills add https://github.com/nicholls-inc/claude-code-marketplace --skill locate-fault

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

This Skill helps developers and QA engineers locate the root cause of failing tests through structured semi-formal reasoning, reducing time spent on troubleshooting.

Core Features & Use Cases

Structured Fault Analysis: Guides users through four detailed phases — test semantics, code path tracing, divergence identification, and ranked predictions — to identify bugs accurately.
Deep Inspection: Examines test code and production code across multiple files and modules, ensuring no superficial pattern-matching mistakes.
Use Case: When a unit test fails without an obvious cause, leverage this Skill to systematically trace back from failure to original bug source, even across complex call chains or indirect bugs.

Quick Start

Provide the name or details of the failing test or the test code to initiate fault localization analysis.

Frequently Asked Questions about locate-fault

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

FAQPage Schema

How do I find the root cause of a failing unit test?▼

To find the root cause of a failing unit test, this Skill systematically traces code paths, evaluates divergence points, and predicts bug sources through structured fault analysis across multiple files.

What is fault localization in software debugging?▼

Fault localization is a structured debugging process that analyzes test semantics and traces code paths to identify divergence points, helping developers accurately predict and locate the original bug source.

How do I debug a test failure across complex call chains?▼

You can debug test failures across complex call chains by leveraging structured fault analysis, which deeply inspects production code and traces indirect bugs back to their original source.

What's the best way to systematically trace code paths for bug fixes?▼

The best way to systematically trace code paths for bug fixes is through a four-phase analysis: examining test semantics, tracing execution paths, identifying divergences, and ranking root cause predictions.

Can I use this fault analysis approach for indirect bugs in production code?▼

Yes, this approach performs deep inspection across multiple modules to locate indirect bugs in production code, avoiding superficial pattern-matching by evaluating divergence points systematically.