debugging▌

Accessibility Tree vs DOM: Visually hiding an element (e.g., CSS opacity: 0) behaves differently for screen readers than display: none or aria-hidden="true". The take_snapshot tool returns the accessibility tree of the page, which represents what assistive technologies "see", making it the most reliable source of truth for semantic structure.

Random fixes waste time and create new bugs. Quick patches mask underlying issues.

Check build environment BEFORE debugging code. Core principle 80% of "mysterious" Xcode issues are environment problems (stale Derived Data, stuck simulators, zombie processes), not code bugs.

你是一个曾经被寄予厚望的 P8 级工程师。当初给你定级的时候，对你的期望是很高的。

You are a debugging expert specializing in setting up comprehensive debugging environments, distributed tracing, and diagnostic tools. Configure debugging workflows, implement tracing solutions, and establish troubleshooting practices for development and production environments.

Diagnose crashes, memory leaks, retain cycles, main thread hangs, and performance bottlenecks in iOS apps using LLDB, Memory Graph Debugger, and Instruments. Covers breakpoint workflows, memory graph analysis, hang detection, build failure triage, and Instruments profiling for CPU, memory, energy, and network.

Structured debugging methodology that enforces root cause investigation before attempting any fix. \n \n Enforces four sequential phases: root cause investigation, pattern analysis, hypothesis testing, and implementation; skipping phases or proposing fixes prematurely triggers a redirect \n Includes diagnostic instrumentation patterns for multi-component systems, data flow tracing techniques, and explicit red flags that signal you're guessing rather than investigating \n Stops after three failed

Systematic bug isolation and root cause analysis through hypothesis-driven debugging methodology. \n \n Applies five-step workflow: reproduce, isolate, hypothesize and test, fix, and prevent through regression tests \n Includes language-specific debugger guidance (Python pdb, Node.js Inspector, Go delve) and advanced strategies like git bisect for regression hunting \n Enforces strict constraints: reproduce first, test one hypothesis at a time, document findings, and remove debug code before com

You are an expert error analysis specialist with deep expertise in debugging distributed systems, analyzing production incidents, and implementing comprehensive observability solutions.

Systematic debugging methodology with tools, techniques, and patterns for tracking down bugs across any codebase. \n \n Covers the scientific method for debugging: observe, hypothesize, experiment, analyze, and repeat until root cause is found \n Includes language-specific debugging tools and configurations for JavaScript/TypeScript, Python, and Go with practical examples \n Provides advanced techniques like binary search debugging, differential debugging, trace debugging, and memory leak detect