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Agent skill

Native App Performance

by harperreed in harperreed/dotfiles

Native macOS/iOS app performance profiling via xctrace/Time Profiler and CLI-only analysis of Instruments traces.

No licenceAuto-check passedDevelopment

Install Native App Performance

skills CLI
$ npx skills add harperreed/dotfiles --skill native-app-performance -a claude-code

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

GitHub CLI
$ gh skill install harperreed/dotfiles native-app-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/harperreed/dotfiles.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/native-app-performance .claude/skills/native-app-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
native-app-performance
GitHub stars
334
Used in
4 other repos
Token cost
~538 tokens
SKILL.md length
161 words
Files
1
Skills in repo
32
Repo updated
First seen
Licence
None found

At a glance

Native macOS/iOS app performance profiling via xctrace/Time Profiler and CLI-only analysis of Instruments traces.

  • Works in 5 steps: Record Time Profiler (attach) → Record Time Profiler (launch) → Extract time samples → …
  • Asked to profile
  • SKILL.md covers Quick start (CLI), Workflow notes, Included scripts and Gotchas
  • Calls xcrun and rg

What it does

Native App Performance is an agent skill from harperreed/dotfiles. Native macOS/iOS app performance profiling via xctrace/Time Profiler and CLI-only analysis of Instruments traces. Use when asked to profile, attach, record, or analyze Instruments .trace files, find hotspots, or optimize native app performance without opening Instruments UI.

Its SKILL.md is about 540 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Development, covering Performance optimization and iOS development. It works with iOS and macOS. The repository describes itself as: Dotfiles. Managed by YADM.

When your agent uses it

  • Asked to profile
  • Analyze Instruments .trace files
  • Optimize native app performance without opening Instruments UI

Example prompts

  • “/native-app-performance”

Workflow steps

5 steps, taken from the first numbered list in SKILL.md.

  1. Record Time Profiler (attach)
  2. Record Time Profiler (launch)
  3. Extract time samples
  4. Get load address for symbolication
  5. Symbolicate + rank hotspots

What it can do on your machine

Read from SKILL.md and the folder at commit b78c10e. 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

    Shell commands in SKILL.md call:

    • xcrun
    • rg

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

  • Network

    No URLs in SKILL.md.

    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

Native App Performance loads about 538 tokens when it runs. Until then it costs about 75 tokens; SKILL.md has 161 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~75
When it runs · the whole SKILL.md, loaded when a task matches
~538

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); files beside SKILL.md are not scanned.

SKILL.md

Without a licence we can't republish the file, so here is its outline and opening line. It has 161 words (~538 tokens).

“Goal: record Time Profiler via xctrace, extract samples, symbolicate, and propose hotspots without opening Instruments.”

— opening of SKILL.md by harperreed
name
native-app-performance

Read the full SKILL.md on GitHub

Files

Just SKILL.md in .claude/skills/native-app-performance of harperreed/dotfiles.

Open the folder on GitHubat commit b78c10e

Used in 4 other repositories

We found 4 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 4 other GitHub owners. This page covers the copy in harperreed/dotfiles, which our catalogue first saw on October 7, 2026.

Compare with similar skills

Native App 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.

Native App Performance compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Native App Performance this skillharperreed/dotfiles3344 repos~538Automated safety check: PassNone
Core Data ExpertAvdLee/Core-Data-Agent-Skill314—~1.2kAutomated safety check: PassMIT
Performance Profilingconorluddy/xclaude-plugin183—~7.3kAutomated safety check: PassMIT
Hopper Debuggersteipete/agent-scripts7.3k—~1.6kAutomated safety check: PassMIT
Debugging Instrumentsdpearson2699/swift-ios-skills1.2k—~3.6kAutomated safety check: PassCustom licence
Native App Profilingtermio-sh/termio540—~1.1kAutomated safety check: PassMIT

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Works with

Categories

Questions about Native App Performance

What does Native App Performance do?

Native macOS/iOS app performance profiling via xctrace/Time Profiler and CLI-only analysis of Instruments traces. Native App Performance is an agent skill from harperreed/dotfiles. Native macOS/iOS app performance profiling via xctrace/Time Profiler and CLI-only analysis of Instruments traces.

When should I use Native App Performance?

Native App Performance fits situations like: asked to profile; analyze Instruments .trace files; optimize native app performance without opening Instruments UI.

How do I install Native App Performance in Claude Code?

Run `npx skills add harperreed/dotfiles --skill native-app-performance -a claude-code`. Or copy the skill folder (.claude/skills/native-app-performance in harperreed/dotfiles) into .claude/skills/native-app-performance in your project. Claude Code loads it when a task matches its description.

How do I install Native App Performance in Codex?

Run `npx skills add harperreed/dotfiles --skill native-app-performance -a codex`. Or copy the skill folder (.claude/skills/native-app-performance in harperreed/dotfiles) into .agents/skills/native-app-performance in your project. Codex loads it when a task matches its description.

Can I use Native App 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 harperreed/dotfiles --skill native-app-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/native-app-performance, .gemini/skills/native-app-performance, .github/skills/native-app-performance and .opencode/skills/native-app-performance in your project.

What does Native App Performance need to run?

Going by SKILL.md and its folder, Native App Performance needs the command-line tools its instructions call (xcrun and rg).

Does Native App Performance access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Native App 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. Review the folder before installing.

What licence does Native App Performance use?

No licence was found for Native App Performance or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.

How many tokens does Native App Performance use?

About 538 tokens (SKILL.md is roughly 2.2k 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 Native App Performance?

Skills that share tags, products or a category with Native App Performance: Core Data Expert (AvdLee/Core-Data-Agent-Skill, 314 stars), Performance Profiling (conorluddy/xclaude-plugin, 183 stars), Hopper Debugger (steipete/agent-scripts, 7.3k stars) and Debugging Instruments (dpearson2699/swift-ios-skills, 1.2k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Native App Performance?

harperreed (a GitHub user) maintains it in harperreed/dotfiles, which has 334 GitHub stars. The repository holds 32 skills in this directory. The repository was last updated on October 3, 2026.

Source: harperreed/dotfiles on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.