What is navigation-event?

An implementation guide for handling Android back gestures and predictive-back animations in Jetpack Compose. It uses Android's NavigationEvent library and covers nested screens, tabs, view pagers, and dialogs.

Use it to add or migrate back handling in Compose activities and nested navigation layouts, including tabbed interfaces and dialogs.

It helps replace older back-button handling with behavior that works correctly as Android's back gesture system changes.

navigation-event — Skill for Claude Code by ArisGuimera/MobiAI-Core

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.

Any agent

npx skills add ArisGuimera/MobiAI-Core --skill navigation-event

Clone the repo

git clone --depth 1 https://github.com/ArisGuimera/MobiAI-Core

Made for: Claude Code.

Or install android, the plugin that ships this one along with the rest of its 35 skills.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/arisguimera/mobiai-core/navigation-event/github.svg)](https://agentmods.dev/skills/arisguimera/mobiai-core/navigation-event)

Your own site

<a href="https://agentmods.dev/skills/arisguimera/mobiai-core/navigation-event"><img src="https://agentmods.dev/badge/skills/arisguimera/mobiai-core/navigation-event/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/arisguimera/mobiai-core/navigation-event"><img src="https://agentmods.dev/badge/skills/arisguimera/mobiai-core/navigation-event.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 64 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 2,691 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin 100% copy Near-identical to another mod 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.

Model	Per session	Once invoked
Fable 5.1	$0.00064	$0.02691
Opus 5.5	$0.00026	$0.01076
Sonnet 5.5	$0.00013	$0.00538
Haiku 4.5	$0.00006	$0.00269

Measured yesterday against content hash 4e9acfb0190c, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

navigation-event 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 yesterday.

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.

Origin

This is a copy

100% identical to navigation-event — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

skills/android/skills/google/navigation-event/SKILL.md · 310 lines

How it starts

The opening of the file, as written. The whole thing — 310 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Common guidelines

For architecture concepts : To understand the foundational architecture, continuous gesture event lifecycles, or class definitions of the Navigation Event library, read Navigation Event overview.
For Android target : If compile SDK is lower than 36, set it to 36 or higher in build.gradle.kts.
For Compose Android target: The project must use Jetpack Compose for Compose-specific APIs. This skill is scoped exclusively to Compose Android (Android Views and non-Compose implementations are excluded).
For activity dispatchers : ComponentActivity automatically implements NavigationEventDispatcherOwner out-of-the-box. You must use the built-in navigationEventDispatcher without creating anonymous delegate owners or overriding member properties.
For dialog scoping : Floating windows (Compose Dialog, ModalBottomSheet, ComponentDialog) automatically provide a NavigationEventDispatcherOwner. You don't need manual CompositionLocalProvider propagation for dialogs.
For parent-child dispatcher hierarchies : When scoping navigation handling to ViewPagers, tabbed interfaces, or nested navigation containers in Compose, use rememberNavigationEventDispatcherOwner() to create a child owner linked to the parent. Disabling the owner (enabled = false) automatically cascades to disable all child handlers.
For Compose handlers : A one-to-one relationship between NavigationEventState and handlers is strictly enforced. Never bind the same NavigationEventState to multiple active NavigationBackHandler instances (IllegalArgumentException).

Step 1: Plan

To complete this step, you MUST ensure the following:

Identify the target platform : Verify the app is targeting Compose Android. If compileSdk is lower than 36, set it to 36 or higher in build.gradle.kts.
Navigation check: Check if Navigation 3 is in use. If it is in use, use Navigation 3's built-in back navigation support rather than manually implementing low-level dispatchers from this skill.
Hierarchy check : Identify host Activities, ViewPagers, tabbed interfaces, or nested navigation hosts that require back gesture interception or parent-child dispatcher linking.
Migration check : Check if the project is migrating from back handling (OnBackPressedCallback, BackHandler, onBackPresser) to NavigationEvent and NavigationBackHandler.
Input interception : Detect where the app is intercepting navigation events from gestures or hardware button presses requiring translation to NavigationEvent.

Read the full file on GitHub · 310 lines

Files

What ships with it

4 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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.

yesterday First seen · 310 lines · 64 tokens per session scan A 4e9acfb0190c

Subscribe to this mod's changes

navigation-event is a skill published in the GitHub repository ArisGuimera/MobiAI-Core (489 stars, last pushed yesterday), licensed MIT. It adds 64 tokens to every session and 2,691 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 100% identical to navigation-event, differing in 0 lines, and is treated as a copy.

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