skill: add Android skills

.agents/skills/navigation-3/SKILL.md

@@ -0,0 +1,112 @@
+---
+name: navigation-3
+description: Learn how to install and migrate to Jetpack Navigation 3, and how to
+  implement features and patterns such as deep links, multiple backstacks, scenes
+  (dialogs, bottom sheets, list-detail, two-pane, supporting pane), conditional navigation
+  (such as logged-in navigation versus anonymous), returning results from flows, integration
+  with Hilt, ViewModel, Kotlin, and view interoperability.
+license: Complete terms in LICENSE.txt
+metadata:
+  author: Google LLC
+  last-updated: '2026-07-09'
+  keywords:
+  - recipe
+  - Android
+  - Navigation 2
+  - Navigation 3
+  - migration
+  - Compose
+  - guide
+  - dependencies
+  - NavKey
+  - NavHost
+  - NavDisplay
+  - BottomSheet
+  - list-detail
+  - scenes
+  - two-pane
+  - supporting pane
+  - multiple backstacks
+  - dialog
+  - Hilt
+  - ViewModel
+  - View interop.
+---
+
+*** ** * ** ***
+
+## Migration guide
+
+- *[Navigation 2 to Navigation 3 migration guide](references/android/guide/navigation/navigation-3/migration-guide.md)*: Step-by-step guide to migrate an Android application from Navigation 2 to Navigation 3, covering dependency updates, route changes, state management, and UI component replacements.
+
+### Requirements
+
+- *[Guide: Migrate to type-safe navigation in Compose](references/android/guide/navigation/type-safe-destinations.md)* : Step-by-step guide to migrating an Android application from string-based navigation to **Type-Safe Navigation** in Jetpack Compose using Jetpack Navigation 2.
+
+## Developer documentation
+
+- *[Navigation 3](references/android/guide/navigation/navigation-3/index.md)*. Search documentation for more information on basics, saving and managing navigation state, modularizing navigation code, creating custom layouts using Scenes, animating between destinations, or applying logic or wrappers to destinations.
+
+## Recipes
+
+Code examples showcasing common patterns.
+
+### Basic API usage
+
+- *[Basic](references/android/guide/navigation/navigation-3/recipes/basic.md)*: Shows most basic API usage.
+- *[Saveable back stack](references/android/guide/navigation/navigation-3/recipes/basicsaveable.md)*: Shows basic API usage with a persistent back stack.
+- *[Entry provider DSL](references/android/guide/navigation/navigation-3/recipes/basicdsl.md)*: Shows basic API usage using the entryProvider DSL.
+
+### Common UI
+
+- *[Common UI](references/android/guide/navigation/navigation-3/recipes/common-ui.md)*: Demonstrates how to implement a common navigation UI pattern with a bottom navigation bar and multiple back stacks, where each tab in the navigation bar has its own navigation history.
+
+### Deep links
+
+- *[Basic](https://developer.android.com/guide/navigation/navigation-3/recipes/deeplinks-basic)*: Shows how to parse a deep link URL from an Android Intent into a navigation key.
+- *[Advanced](references/android/guide/navigation/navigation-3/recipes/deeplinks-advanced.md)*: Shows how to handle deep links with a synthetic back stack and correct "Up" navigation behavior.
+
+### Scenes
+
+#### Use built-in Scenes
+
+- *[Dialog](references/android/guide/navigation/navigation-3/recipes/dialog.md)*: Shows how to create a Dialog.
+
+#### Create custom Scenes
+
+- *[BottomSheet](references/android/guide/navigation/navigation-3/recipes/bottomsheet.md)*: Shows how to create a BottomSheet destination.
+- *[List-Detail Scene](references/android/guide/navigation/navigation-3/recipes/scenes-listdetail.md)*: Demonstrates how to implement adaptive list-detail layouts using the Navigation 3 Scenes API.
+- *[Two pane Scene](references/android/guide/navigation/navigation-3/recipes/scenes-twopane.md)*: Demonstrates how to implement adaptive two-pane layouts using the Navigation 3 Scenes API.
+
+### Material Adaptive
+
+- *[Material List-Detail](references/android/guide/navigation/navigation-3/recipes/material-listdetail.md)*: Demonstrates how to implement an adaptive list-detail layout using Material 3 Adaptive.
+- *[Material Supporting Pane](references/android/guide/navigation/navigation-3/recipes/material-supportingpane.md)*: Demonstrates how to implement an adaptive supporting pane layout using Material 3 Adaptive.
+
+### Animations
+
+- *[Animations](references/android/guide/navigation/navigation-3/recipes/animations.md)*: Shows how to override the default animations for all destinations and a single destination.
+
+### Common back stack behavior
+
+- *[Multiple back stacks](references/android/guide/navigation/navigation-3/recipes/multiple-backstacks.md)*: Shows how to create multiple top level routes, each with its own back stack. Top level routes are displayed in a navigation bar allowing users to switch between them. State is retained for each top level route, and the navigation state persists config changes and process death.
+
+### Conditional navigation
+
+- *[Conditional navigation](references/android/guide/navigation/navigation-3/recipes/conditional.md)*: Switch to a different navigation flow when a condition is met. For example, for authentication or first-time user onboarding.
+
+### Architecture
+
+- *[Modularized navigation code (Hilt)](references/android/guide/navigation/navigation-3/recipes/modular-hilt.md)*: Demonstrates how to decouple navigation code into separate modules using Hilt or Dagger for DI.
+- *[Modularized navigation code (Koin)](references/android/guide/navigation/navigation-3/recipes/modular-koin.md)*: Demonstrates how to decouple navigation code into separate modules using Koin for DI.
+
+### Working with ViewModel
+
+#### Passing navigation arguments
+
+- *[Basic ViewModel](references/android/guide/navigation/navigation-3/recipes/passingarguments.md)* : Navigation arguments are passed to a `ViewModel` constructed using `viewModel()`
+
+### Returning results
+
+- *[Returning Results as Events](references/android/guide/navigation/navigation-3/recipes/results-event.md)* : Returning results as events to content in another `NavEntry`
+- *[Returning Results as State](references/android/guide/navigation/navigation-3/recipes/results-state.md)* : Returning results as state stored in a `CompositionLocal`