Agent-Skills.md

Agent Skills: Navigation Latency

Measure time from navigation tap to screen fully loaded and interactive. Use when tracking screen transitions, deep links, or tab switches.

UncategorizedID: nexus-labs-automation/mobile-observability/navigation-latency

Repository

nexus-labs-automation/mobile-observability
nexus-labs-automationLicense: MIT
917

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skills/navigation-latency/SKILL.md

Skill Metadata

Name
navigation-latency
Description
Measure time from navigation tap to screen fully loaded and interactive. Use when tracking screen transitions, deep links, or tab switches.

Navigation Latency

Time from tap to destination screen interactive (TTI).

Phases

TAP → TRANSITION → VIEW_INIT → DATA_LOAD → INTERACTIVE
     |_____________________________________________|
                   Navigation Latency

When to Use

  • Tab bar taps
  • List item → detail screen
  • Deep link → target screen
  • Any screen-to-screen transition

Key Thresholds

| Rating | Duration | |--------|----------| | Good | <400ms | | Acceptable | <1s | | Poor | >1s |

Measurement Points

  1. onNavigationStart - user taps (source screen)
  2. onViewAppear - destination view visible
  3. onContentReady - data loaded, interactive

Implementation

See references/ui-performance.md (Navigation Latency section) for:

  • iOS: NavigationLatencyTracker with os_signpost
  • Android: Fragment/Activity lifecycle hooks
  • React Native: React Navigation listeners

Common Mistakes

  • Measuring only view appear (missing data load)
  • Not correlating source → destination
  • Ignoring warm vs cold screen loads

Related Skills

  • See skills/interaction-latency for button/tap response times (vs full screen loads)
  • Combine with skills/user-journey-tracking to correlate navigation with user intent