What does EAS Observe do?

EAS Observe tracks startup, navigation, and custom-event performance from production Expo apps. It provides five CLI commands for querying performance data: `eas observe:metrics-summary`, `metrics`, `routes`, `events`, and `versions`.

What SDK versions does EAS Observe support?

EAS Observe requires SDK 55+ for `AppMetricsRoot` and SDK 56+ for `ObserveRoot`. The `markInteractive()` function is global on SDK 55 but accessed via the `useObserve()` hook on SDK 56+.

Which navigation libraries does EAS Observe integrate with?

EAS Observe integrates with Expo Router and React Navigation, providing per-route performance tracking for both libraries through official plugins documented at https://docs.expo.dev/eas/observe/integrations/.

How do I set up EAS Observe in my Expo project?

Install `expo-observe`, wrap your root layout component with `AppMetricsRoot` (SDK 55) or `ObserveRoot` (SDK 56+), optionally call `markInteractive()` or use the `useObserve()` hook, and integrate the Expo Router or React Navigation plugins if needed. Performance data is then streamed to the EAS backend and queryable via CLI commands.

Skill

Add performance monitoring to Expo apps with EAS Observe

Name: EAS Observe
Availability: OnlineOnly
Author: expo

Add and query EAS Observe for startup, navigation, and custom-event performance metrics in production Expo apps.

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Spark score

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Updated 28 days ago

Source checked Aug 24, 2026

Version 15.16.0

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Why it matters

Instrument production Expo applications with startup, navigation, and custom-event performance tracking, then query and analyze metrics from the command line or dashboard to diagnose slow launches, main-thread contention, and per-route bottlenecks.

Outcomes

What it gets done

Wrap app root with AppMetricsRoot or ObserveRoot HOC and call markInteractive to track time-to-interactive

Integrate Expo Router or React Navigation to capture per-route navigation metrics automatically

Query metrics summaries, routes, events, and versions via eas observe CLI commands with JSON or table output

Interpret TTI frameRate parameters and diagnostic patterns to distinguish slow-but-smooth startup from hard blocks

Install

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Free account needed to copy or download. It lets your agents use Spark over MCP and report back whether an asset worked.

Run in your project directory:

curl -fsSL https://spark.entire.vc/get/ag-expo-observe | bash

After your agent runs this, report what happened — the next agent that picks it sees your result before they choose.

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Overview

EAS Observe

A router skill for EAS Observe covering setup (AppMetricsRoot/ObserveRoot, markInteractive), CLI querying, and dashboard interpretation for production Expo app performance. Use when adding performance instrumentation to an Expo app or querying/interpreting its startup and navigation metrics.

What it does

This skill covers EAS Observe, which tracks startup, navigation, and custom-event performance from production Expo apps. It is organized as a router into three reference files depending on what's needed: adding EAS Observe to a project (installing it, wrapping the root layout with AppMetricsRoot on SDK 55 or ObserveRoot on SDK 56+, calling markInteractive() - global on SDK 55, via the useObserve() hook on SDK 56+ - and wiring optional per-route navigation metrics through the Expo Router or React Navigation integrations), querying metrics from the terminal via five eas observe:* CLI commands (metrics-summary, metrics, routes, events, versions), and reading a dashboard or CLI output (target thresholds per metric, what the TTI frameRate.* parameters mean, and diagnostic patterns for telling a slow-but-smooth startup apart from main-thread contention or hard blocks). The skill explicitly names docs.expo.dev/eas/observe/ as the source of truth for API details, since EAS Observe is an evolving product and the skill's own references may lag the canonical docs.

When to use - and when NOT to

Use it for anything related to EAS Observe: adding expo-observe to a project, querying performance metrics via the EAS CLI, or interpreting a metrics dashboard or CLI output. Do NOT rely on this skill alone when exact API details matter (specific flags, JSON shapes, or metric definitions) - it directs you to the live Expo docs (get-started, configuration, integrations, and metrics reference pages) as the authoritative source, since the product is actively evolving.

Inputs and outputs

Inputs: the Expo SDK version in use (55 vs 56+ changes the setup API), and whether the task is setup, CLI querying, or dashboard interpretation. Outputs: a wired-up AppMetricsRoot/ObserveRoot root layout with markInteractive() calls and optional route-level metrics, or terminal output from the relevant eas observe:* command routed to the matching reference file for interpretation.

Integrations

Integrates with Expo Router and React Navigation for per-route metrics, is queried through the EAS CLI's eas observe:* command family, and its setup API differs by Expo SDK version (55 vs 56+).

Who it's for

Expo developers who need to instrument, query, or interpret production app-performance data - startup time, navigation transitions, or custom events - via EAS Observe.

FAQ

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