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Guide to accessing device logs on iOS and Android for Capacitor apps. Covers command-line tools, GUI applications, filtering, and real-time streaming. Use this skill when users need to view device logs for debugging.
默认使用会先检查来源的 Prompt；你也可以切换为直接命令，或下载本地副本。
决定是否安装前，请先阅读 SKILL.md，以及 SkillsMP 当前展示的配套文件。
用 Codex 或 Claude 帮你安装 复制这段 Prompt，粘贴到 Codex、Claude 或其他助手里，让它检查 Skill 页面并帮你完成安装。
直接命令不会经过审查 Prompt；运行前请先检查来源。
npx skills add https://github.com/Cap-go/capgo-skills --skill ios-android-logs命令会保持在同一行。复制前请横向滚动并检查完整内容。
想先保存到本地？可下载 SkillsMP 当前能够提供的文件。
Guides migration from Capawesome Cloud live updates or @capawesome/capacitor-live-update to Capgo Updater. Use when a Capacitor app contains Capawesome live update packages, CLI commands, config, API calls, or when the user asks why Capgo Updater is the better live-update path: native updater runtime, fully open source, cheaper at comparable scale, and longer proven track record.
Official Capacitor package guide plus Capgo ecosystem plugin recommendations. Use this skill when users need native functionality, want the right official Capacitor package, or need a stronger Capgo/community plugin when the official package is missing or too limited.
Use for Capgo Cloud Build native iOS and Android workflows, including CLI login, API-key handling, iOS build onboarding, signing credential storage, build requests, store upload settings, output download links, and troubleshooting. Do not use for OTA bundle uploads or generic Capacitor setup unless a native Capgo build is requested.
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基于 SOC 职业分类
| name | ios-android-logs |
| description | Guide to accessing device logs on iOS and Android for Capacitor apps. Covers command-line tools, GUI applications, filtering, and real-time streaming. Use this skill when users need to view device logs for debugging. |
Complete guide to viewing and filtering device logs on iOS and Android.
# iOS - Stream logs from connected device
xcrun devicectl device log stream --device <UUID>
# iOS - Stream from simulator
xcrun simctl spawn booted log stream
# Android - Stream all logs
adb logcat
# Android - Filter by package
adb logcat --pid=$(adb shell pidof com.yourapp.id)
process:YourAppsubsystem:com.yourapp"error"# List connected devices
xcrun devicectl list devices
# Stream logs from specific device
xcrun devicectl device log stream --device <DEVICE_UUID>
xcrun devicectl device stream --device <DEVICE_UUID> \
--predicate
xcrun devicectl device stream --device <DEVICE_UUID> \
--level error
xcrun devicectl device stream --device <DEVICE_UUID> \
--predicate > app_logs.txt
# Stream logs from booted simulator
xcrun simctl spawn booted log stream
# Filter by process
xcrun simctl spawn booted log stream --predicate 'process == "YourApp"'
# Filter by subsystem
xcrun simctl spawn booted log stream --predicate 'subsystem == "com.yourapp"'
# Show only errors
xcrun simctl spawn booted log stream --level error
# Combine filters
xcrun simctl spawn booted log stream \
--predicate 'process == "YourApp" AND messageType == error'
# Process name
--predicate 'process == "YourApp"'
# Contains text
--predicate 'eventMessage contains "error"'
# Subsystem
--predicate 'subsystem == "com.yourapp.plugin"'
# Category
--predicate 'category == "network"'
# Log level
--predicate 'messageType == error'
# Combined
--predicate 'process == "YourApp" AND messageType >= error'
# Time-based (last 5 minutes)
--predicate 'timestamp > now - 5m'
| Level | Description |
|---|---|
default | Default messages |
info | Informational |
debug | Debug (hidden by default) |
error | Error conditions |
fault | Fault/critical |
# Basic log stream
adb logcat
# Clear logs first, then stream
adb logcat -c && adb logcat
# Filter by tag
adb logcat -s MyTag:D
# Filter by priority
adb logcat *:E # Only errors and above
# Filter by package name
adb logcat --pid=$(adb shell pidof com.yourapp.id)
# Filter by multiple tags
adb logcat -s "MyPlugin:D" "Capacitor:I"
# Save to file
adb logcat > logs.txt
# Save to file with timestamp
adb logcat -v time > logs.txt
package:com.yourapptag:MyPluginlevel:error# Install pidcat
pip install pidcat
# Stream logs for package
pidcat com.yourapp.id
# With tag filter
pidcat -t MyPlugin com.yourapp.id
| Letter | Priority |
|---|---|
| V | Verbose |
| D | Debug |
| I | Info |
| W | Warn |
| E | Error |
| F | Fatal |
| S | Silent |
# Different output formats
adb logcat -v brief # Default
adb logcat -v process # PID only
adb logcat -v tag # Tag only
adb logcat -v time # With timestamp
adb logcat -v threadtime # With thread and time
adb logcat -v long # All metadata
# Colorized output
adb logcat -v color
# Show recent logs (last N lines)
adb logcat -d -t 100
# Show logs since timestamp
adb logcat -v time -T "01-25 10:00:00.000"
# Capacitor core logs
adb logcat -s "Capacitor:*"
# Plugin-specific logs
adb logcat -s "CapacitorNativeBiometric:*"
# WebView logs (JavaScript console)
adb logcat -s "chromium:*"
# JavaScript errors
adb logcat | grep -i "js error\|uncaught"
# Crash logs
adb logcat | grep -iE "fatal|crash|exception"
# Network logs
adb logcat -s "OkHttp:*" "NetworkSecurityConfig:*"
# Copy crash logs from device
xcrun devicectl device copy crashlog --device <UUID> ./crashes/
# View in Console.app
# User Diagnostics Reports section
# Or find at:
# Device: Settings > Privacy > Analytics & Improvements > Analytics Data
# Mac: ~/Library/Logs/DiagnosticReports/
# Get tombstone (native crash)
adb shell cat /data/tombstones/tombstone_00
# Get ANR traces
adb pull /data/anr/traces.txt
# Get bugreport (comprehensive)
adb bugreport > bugreport.zip
Use MCP tools to fetch logs programmatically:
// Example MCP tool for fetching iOS logs
const logs = await mcp.ios.streamLogs({
device: 'booted',
predicate: 'process == "YourApp"',
level: 'debug',
});
// Example MCP tool for Android logs
const androidLogs = await mcp.android.logcat({
package: 'com.yourapp.id',
level: 'D',
});
# iOS - JavaScript console logs
xcrun simctl spawn booted log stream \
--predicate 'eventMessage contains "JS:"'
# Android - WebView console
adb logcat chromium:I *:S | grep "console"
# iOS
xcrun simctl spawn booted log stream \
--predicate 'subsystem == "com.apple.network"'
# Android
adb logcat -s "NetworkSecurityConfig:*" "OkHttp:*"
# iOS - Memory pressure
xcrun simctl spawn booted log stream \
--predicate 'eventMessage contains "memory"'
# Android - Memory info
adb shell dumpsys meminfo com.yourapp.id
iOS:
Android:
adb devices to verify connectionadb kill-server && adb start-serverUse filters:
# iOS - Only your app
--predicate 'process == "YourApp" AND messageType >= info'
# Android - Only your package
adb logcat --pid=$(adb shell pidof com.yourapp.id)
iOS: Debug logs are hidden by default
# Enable debug logs
xcrun simctl spawn booted log stream --level debug
Android: Ensure log level is set correctly
Log.d("Tag", "Debug message") // D level