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Agent skill

iOS Ettrace Performance

by dpearson2699 in dpearson2699/swift-ios-skills

A skill your agent uses when capturing or analyzing ETTrace profiles for a focused iOS launch or runtime flow, including exact-build dSYM UUID matching, Simulator or device capture, processed…

Custom licenceAuto-check passedMobile

Install iOS Ettrace Performance

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

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install dpearson2699/swift-ios-skills ios-ettrace-performance --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/dpearson2699/swift-ios-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/ios-ettrace-performance .claude/skills/ios-ettrace-performance && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
ios-ettrace-performance
GitHub stars
1.2k
Token cost
~2.2k tokens
SKILL.md length
1,008 words
Files
4 (incl. scripts)
Skills in repo
86
Repo updated
First seen
Licence
Custom licence

At a glance

A skill your agent uses when capturing or analyzing ETTrace profiles for a focused iOS launch or runtime flow, including exact-build dSYM UUID matching, Simulator or device capture, processed…

  • Works in 6 steps: Triage before instrumenting → Record and hold ETTrace versions fixed → Build first, then collect matching dSYMs → …
  • Analyzing ETTrace profiles for a focused iOS launch
  • SKILL.md covers Contents, Boundary, Capture Contract and Workflow, plus 4 more sections
  • Runs Python scripts from its folder; calls python3 and brew

What it does

iOS Ettrace Performance is an agent skill from dpearson2699/swift-ios-skills. Use when capturing or analyzing ETTrace profiles for a focused iOS launch or runtime flow, including exact-build dSYM UUID matching, Simulator or device capture, processed per-thread flamegraph JSON, sampled inclusive/exclusive time, unresolved symbols, and comparable verification. Use debugging-instruments or swiftui-performance for generic profiling instead.

Its SKILL.md is about 2.2k tokens, which your agent loads only when the skill is triggered. The skill folder holds 5 other files, including scripts (for example `evals/evals.json`, `scripts/analyze_ettrace.py` and `scripts/collect_dsyms.py`).

It sits in Mobile, covering iOS development. It works with iOS and SwiftUI. The repository describes itself as: Agent Skills for iOS 26+, Swift 6.3, SwiftUI, and modern Apple frameworks.

When your agent uses it

  • Analyzing ETTrace profiles for a focused iOS launch
  • Including exact-build dSYM UUID matching
  • Processed per-thread flamegraph JSON
  • Sampled inclusive/exclusive time

Example prompts

  • “/ios-ettrace-performance”

Requirements

  • Python 3

Workflow steps

6 steps, taken from the step headings in SKILL.md.

  1. Triage before instrumenting
  2. Record and hold ETTrace versions fixed
  3. Build first, then collect matching dSYMs
  4. Capture from a clean artifact directory
  5. Validate and summarize processed output
  6. Change one cause and repeat

What it can do on your machine

Read from SKILL.md and the folder at commit 8d90fd1. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Ships 2 files in scripts/ (Python), which the agent can run.

    Shell commands in SKILL.md call:

    • python3
    • brew

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    Links to these hosts (documentation or services it may open):

    • github.com

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

iOS Ettrace Performance loads about 2.2k tokens when it runs. Until then it costs about 97 tokens; SKILL.md has 1,008 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~97
When it runs · the whole SKILL.md, loaded when a task matches
~2.2k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); the scripts in this folder are not scanned.

SKILL.md

Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 1,008 words (~2,189 tokens).

“Use ETTrace for a bounded, symbolicated sampling experiment. Treat capture conditions and symbolication as part of the evidence, not as setup trivia.”

— opening of SKILL.md by dpearson2699, Custom licence
name
ios-ettrace-performance

Read the full SKILL.md on GitHub

Files

SKILL.md and 3 other files (scripts) in skills/ios-ettrace-performance of dpearson2699/swift-ios-skills.

  • SKILL.md
  • evals/evals.json
  • scripts/analyze_ettrace.py
  • scripts/collect_dsyms.py

Open the folder on GitHubat commit 8d90fd1

Compare with similar skills

iOS Ettrace Performance next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

iOS Ettrace Performance compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
iOS Ettrace Performance this skilldpearson2699/swift-ios-skills1.2k—~2.2kAutomated safety check: PassCustom licence
Update Swiftui APIsAvdLee/SwiftUI-Agent-Skill3.7k—~1.2kAutomated safety check: PassMIT
Swiftui Liquid Glassharperreed/dotfiles3348 repos~941Automated safety check: PassNone
Swiftui Expert Skillomarshahine/HomeClaw1764 repos~2.8kAutomated safety check: PassMIT
Hig Project Contextraintree-technology/hig-doctor1435 repos~1.2kAutomated safety check: PassMIT
Liquid Glass DesignAstraFoundry/KumoApp2905 repos~2.3kAutomated safety check: PassAGPL-3.0

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Works with

Categories

Questions about iOS Ettrace Performance

What does iOS Ettrace Performance do?

A skill your agent uses when capturing or analyzing ETTrace profiles for a focused iOS launch or runtime flow, including exact-build dSYM UUID matching, Simulator or device capture, processed…. iOS Ettrace Performance is an agent skill from dpearson2699/swift-ios-skills. Use when capturing or analyzing ETTrace profiles for a focused iOS launch or runtime flow, including exact-build dSYM UUID matching, Simulator or device capture, processed per-thread flamegraph JSON, sampled inclusive/exclusive time, unresolved symbols, and comparable verification.

When should I use iOS Ettrace Performance?

iOS Ettrace Performance fits situations like: analyzing ETTrace profiles for a focused iOS launch; including exact-build dSYM UUID matching; processed per-thread flamegraph JSON; sampled inclusive/exclusive time.

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`. Or copy the skill folder (skills/ios-ettrace-performance in dpearson2699/swift-ios-skills) into .claude/skills/ios-ettrace-performance in your project. Claude Code loads it when a task matches its description.

How do I install iOS Ettrace Performance in Codex?

Run `npx skills add dpearson2699/swift-ios-skills --skill ios-ettrace-performance -a codex`. Or copy the skill folder (skills/ios-ettrace-performance in dpearson2699/swift-ios-skills) into .agents/skills/ios-ettrace-performance in your project. Codex loads it when a task matches its description.

Can I use iOS Ettrace Performance in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add dpearson2699/swift-ios-skills --skill ios-ettrace-performance -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/ios-ettrace-performance, .gemini/skills/ios-ettrace-performance, .github/skills/ios-ettrace-performance and .opencode/skills/ios-ettrace-performance in your project.

What does iOS Ettrace Performance need to run?

Going by SKILL.md and its folder, iOS Ettrace Performance needs Python for the scripts in its folder and the command-line tools its instructions call (python3 and brew). Our summary lists: Python 3.

Does iOS Ettrace Performance access the network?

SKILL.md names 1 domain. As links in the text: github.com. This is read from the text; nothing was executed.

Is iOS Ettrace Performance safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.

What licence does iOS Ettrace Performance use?

iOS Ettrace Performance has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.

How many tokens does iOS Ettrace Performance use?

About 2.2k tokens (SKILL.md is roughly 8.8k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to iOS Ettrace Performance?

Skills that share tags, products or a category with iOS Ettrace Performance: Update Swiftui APIs (AvdLee/SwiftUI-Agent-Skill, 3.7k stars), Swiftui Liquid Glass (harperreed/dotfiles, 334 stars), Swiftui Expert Skill (omarshahine/HomeClaw, 176 stars) and Hig Project Context (raintree-technology/hig-doctor, 143 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains iOS Ettrace Performance?

dpearson2699 (a GitHub user) maintains it in dpearson2699/swift-ios-skills, which has 1,175 GitHub stars. The repository holds 86 skills in this directory. The repository was last updated on July 31, 2026.

Source: dpearson2699/swift-ios-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.