skill CX Codex

ios-ettrace-performance · dpearson2699 — Claude Code skill

Q: How do I install ios-ettrace-performance in Claude Code?

Run `npx skills add dpearson2699/swift-ios-skills --skill ios-ettrace-performance -a claude-code`, then run `npx skills add dpearson2699/swift-ios-skills --skill ios-ettrace-performance -a claude-code` again. Then use `~/.claude/skills/ios-ettrace-performance/SKILL.md`.

This skill guides a focused iOS ETTrace capture from matching dSYMs to per-thread analysis. Use it when comparing a repeatable launch or runtime flow.

Install into Claude Code · Skills CLI (Vercel) All methods and platforms ↓

npx skills add dpearson2699/swift-ios-skills --skill ios-ettrace-performance -a claude-code

Open on GitHub

What ios-ettrace-performance does

The skill lays out an ETTrace workflow for one bounded iOS flow. It records capture conditions, gathers dSYMs by UUID from the final build, and keeps processed output_<threadId>.json files. It covers launch and runtime capture on a Simulator or a device.

It includes commands for installing ETTrace with Homebrew plus scripts/collect_dsyms.py and scripts/analyze_ettrace.py. The analyzer checks the v1.1.1 output shape, summarizes thread data, separates inclusive from exclusive time, and puts address-bearing frames in unresolved_frames. You need Python 3, ETTrace, and the ETTrace package linked to the app target being measured. Important app frames shown as <unknown> mean symbolication must be fixed before code changes are judged.

The workflow calls for repeating the same flow after the smallest supported change while holding capture conditions steady. For broad CPU, hitch, I/O, or concurrency investigation, it points to Instruments instead.

What it helps with

collect dSYMs that match build UUIDs
capture an iOS launch on a Simulator
summarize per-thread ETTrace JSON files
flag unresolved symbols and wrong binary attribution
compare repeated captures of one flow

Example prompts for the agent

“Capture an ETTrace profile for this iOS app launch on a Simulator and verify dSYM UUIDs.”
“Analyze output_*.json with scripts/analyze_ettrace.py and list hot frames.”
“Repeat the ETTrace capture after my change with the same capture contract.”

How to install ios-ettrace-performance

1Skills CLI (Vercel)

npx skills add dpearson2699/swift-ios-skills --skill ios-ettrace-performance -a claude-code

2Manually: put the files in place

~/.claude/skills/ios-ettrace-performance/SKILL.md

Copy the whole skill folder; for one project use .claude/skills/ios-ettrace-performance/

1Skills CLI (Vercel)

npx skills add dpearson2699/swift-ios-skills --skill ios-ettrace-performance -a codex

2Manually: put the files in place

.agents/skills/ios-ettrace-performance/SKILL.md

For all projects use ~/.agents/skills/

1Skills CLI (Vercel)

npx skills add dpearson2699/swift-ios-skills --skill ios-ettrace-performance -a cursor

2Manually: put the files in place

.cursor/skills/ios-ettrace-performance/SKILL.md

Cursor also reads .agents/skills/ and .claude/skills/

1GitHub CLI

gh skill install dpearson2699/swift-ios-skills ios-ettrace-performance

2Manually: put the files in place

.github/skills/ios-ettrace-performance/SKILL.md

1Skills CLI (Vercel)

npx skills add dpearson2699/swift-ios-skills --skill ios-ettrace-performance -a gemini-cli

2Platform CLI

gemini skills install https://github.com/dpearson2699/swift-ios-skills --path skills/ios-ettrace-performance

Manually: put the files in place

.devin/skills/ios-ettrace-performance/SKILL.md

The legacy .windsurf/skills/ path still works

Skills CLI (Vercel)

npx skills add dpearson2699/swift-ios-skills --skill ios-ettrace-performance -a opencode

Step by step, with commands for each platform: How to install skills in Claude Code: five ways

Questions about ios-ettrace-performance

How do I install ios-ettrace-performance in Claude Code?

Run npx skills add dpearson2699/swift-ios-skills --skill ios-ettrace-performance -a claude-code, then run npx skills add dpearson2699/swift-ios-skills --skill ios-ettrace-performance -a claude-code again. Then use ~/.claude/skills/ios-ettrace-performance/SKILL.md.

What does ios-ettrace-performance do?

It guides focused ETTrace profiling for an iOS flow. The skill covers exact-build dSYM collection, symbolication checks, per-thread reports, and repeatable comparisons.

What is required to analyze an ETTrace profile?

You need the final instrumented build, dSYMs with matching UUIDs, and processed output_<threadId>.json files. Its scripts use Python 3, and ETTrace is installed with Homebrew.

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