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ios-instruments-mcp

ios-instruments-mcp

MCP server that wraps xctrace (Instruments) to profile iOS apps directly from Claude. Ask natural language questions about your app's performance and get actionable answers.

What you can ask Claude

"Faz o launch timer do com.myapp.ios e diz-me os ofensores"
"Analisa o memory footprint do app no simulador"
"Verifica se há leaks de memória no com.myapp.ios"
"Qual função está a consumir mais CPU?"
"Há requests de rede lentos no app?"
"Analisa o trace em ~/Desktop/launch.xctrace"

Related MCP server: Perfetto MCP

Requirements

  • macOS with Xcode installed

  • Xcode Command Line Tools: xcode-select --install

  • Node.js ≥ 18

Setup

# 1. Clone and install
git clone https://github.com/bfernandesbfs/ios-instruments-mcp.git
cd ios-instruments-mcp
npm install
npm run build

# 2. Register in Claude Desktop

Add to ~/Library/Application Support/Claude/claude_desktop_config.json:

{
  "mcpServers": {
    "ios-instruments": {
      "command": "node",
      "args": ["/absolute/path/to/ios-instruments-mcp/build/index.js"]
    }
  }
}

Restart Claude Desktop after saving.

Available Tools

Tool

Template

Description

list_devices

Lists simulators and physical devices

list_templates

Lists all Instruments templates on this Mac

analyze_launch

App Launch

Records + analyzes app startup time

analyze_launch_trace

App Launch

Analyzes an existing .xctrace file

analyze_allocations

Allocations

Peak memory, top allocation types

analyze_allocations_trace

Allocations

Analyzes an existing .xctrace file

analyze_leaks

Leaks

Memory leak detection with retain cycle info

analyze_leaks_trace

Leaks

Analyzes an existing .xctrace file

analyze_time_profiler

Time Profiler

CPU hot methods and main thread usage

analyze_time_profiler_trace

Time Profiler

Analyzes an existing .xctrace file

analyze_network

Network

Slow requests, transfer sizes, status codes

analyze_network_trace

Network

Analyzes an existing .xctrace file

Example output (App Launch)

# App Launch Analysis — com.myapp.ios

⚠️ Launch time 1240ms — above 400ms. Users may notice the delay.

**Total:** 1240ms

## Phases
- pre-main (dyld + static init): 434ms (35%)
- post-main (AppDelegate + UI): 806ms (65%)

## Top Offenders

🔴 `-[DatabaseManager setup]` [post-main]
   Self: 540ms | Total: 540ms | 43%
   💡 Move database initialization to a background queue or use lazy loading.

🟡 `+[AnalyticsSDK configure:]` [post-main]
   Self: 210ms | Total: 210ms | 17%
   💡 Defer analytics SDK initialization after first frame is rendered.

## Recommendations
- Fix 1 critical offender(s) — each adds 300ms+ to launch.
- Target: total launch under 400ms.

Notes

  • Physical devices require Enable UI Automation in Settings → Developer

  • Temp .xctrace files are cleaned up automatically after each run

  • The parser handles both legacy and modern xctrace XML formats

  • All tools have an _trace variant for analyzing files you already have on disk

License

MIT

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Maintenance

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Release cycle
Releases (12mo)
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