optimize

A command for improving iOS app performance with Apple's Instruments profiling tool, which measures issues such as startup time, rendering, memory, and battery use.

In plain words
What is it for?
Profiling and improving app launch speed, SwiftUI rendering, memory usage, or battery efficiency against a chosen goal.
Why use it?
It replaces guesses about slowness with measurements and targeted optimization work.

Command

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add commands/carolanelfbv/ios-development-agents/optimize
Clone the repo
git clone --depth 1 https://github.com/CarolaneLFBV/ios-development-agents
Per session 5 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 563 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00005 $0.00563
Opus 5 $0.00003 $0.00282
Sonnet 5 $0.00001 $0.00113
Haiku 4.5 $0.00001 $0.00056

Measured 2d ago against content hash 1f9671eb658d, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

optimize scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

commands/optimize.md · 86 lines

How it starts

The opening of the file, as written. The whole thing — 86 lines — stays where its author put it; the contents beside it link to each section on GitHub.

/ios:optimize - Performance Optimization

Optimize $ARGUMENTS using Instruments profiling and best practices.

Delegation

Executed by the performance-specialist. Spawn it via the Task tool with the --metric and --goal; it profiles, applies optimizations, and reports before/after measurements.

Arguments

Flag Values Default Description
--metric launch|render|memory|battery render Optimization metric
--goal <value> - Performance goal (e.g., "launch<2s")
--instruments - - Use Xcode Instruments

Optimization Areas

Metric Focus Target
launch App startup time <2s cold, <1s warm
render SwiftUI rendering 60fps, no hitches
memory Memory usage <100MB baseline
battery Energy efficiency Low CPU usage

Optimization Patterns

// List Performance
// Before:
VStack { ForEach(items) { ExpensiveView(item: $0) } }

// After:
LazyVStack(spacing: 8) {
    ForEach(items, id: \.id) { ItemView(item: $0).id($0.id) }
}

// Image Loading
// Before:
Image(uiImage: loadImage())

// After:
AsyncImage(url: imageURL) { phase in
    switch phase {
    case .success(let image): image.resizable()
    default: ProgressView()
    }
}

Instruments Templates

Template Use Case
Time Profiler CPU usage, hot paths
Allocations Memory usage, leaks
SwiftUI View body evaluation
Core Animation Rendering performance
Energy Log Battery consumption

Examples

/ios:optimize App --metric launch --goal "launch<1s"
/ios:optimize ProductList --metric render
/ios:optimize . --metric memory --instruments
/ios:optimize ImageLoader --metric battery

Output

# Optimization: [Target]
## Metric: launch | render | memory | battery
## Before: Current measurements
## After: Improved measurements
## Changes: Applied optimizations
## Instruments: Profile recommendations

Read the full file on GitHub · 86 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2d ago First seen · 86 lines · 5 tokens per session scan A 1f9671eb658d

Subscribe to this mod's changes

optimize is a command published in the GitHub repository CarolaneLFBV/ios-development-agents (7 stars, last pushed 1mo ago), licensed MIT. It adds 5 tokens to every session and 563 once invoked, about $0.0000 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.