# compose-expert

Skill outlining shared Jetpack Compose rules in Amethyst: Navigation 3, adaptive shell layouts, and UI performance conventions.

- skill · `type=skill` · Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, OpenCode · 1400 installs · ★ 1614
- Author: vitorpamplona
- License: MIT · policy=mirror · the beginning of the file is at the end of this page
- Source: https://github.com/vitorpamplona/amethyst/tree/HEAD/.claude/skills/compose-expert/SKILL.md
- Updated: 2026-10-25
- HTML: https://affpapa.org/en/nevibecode/skills/compose-expert

## What it does

This skill guides development inside `commonsUI/` for the Amethyst client. It governs shared screens, theme tokens, and the adaptive `AppShellLayout`. Window tiers rely on `ScreenLayoutSpec` read via `LocalScreenLayout.current`, avoiding direct platform checks for Android or desktop environments.

Navigation relies on Navigation 3 without a `NavController` or navigation graph. The back stack persists as snapshot state with `kotlinx-serialization`. Shared composables follow strict conventions: UI-state collections must use `kotlinx.collections.immutable`, text comes from `Res.string`, and rich text is processed through `CachedRichTextParser`.

The skill explicitly delegates out-of-scope work. It redirects Android manifest work to `android-expert`, window chrome to `desktop-expert`, and coroutine logic to `kotlin-coroutines`.

## Install

### Claude Code (native platform)

1. **Skills CLI (Vercel)**
```bash
npx skills add vitorpamplona/amethyst --skill compose-expert -a claude-code
```

2. **Manually: put the files in place**
- File: `~/.claude/skills/compose-expert/SKILL.md` — Copy the whole skill folder; for one project use .claude/skills/compose-expert/

### Codex

1. **Skills CLI (Vercel)**
```bash
npx skills add vitorpamplona/amethyst --skill compose-expert -a codex
```

2. **Manually: put the files in place**
- File: `.agents/skills/compose-expert/SKILL.md` — For all projects use ~/.agents/skills/

### Cursor

1. **Skills CLI (Vercel)**
```bash
npx skills add vitorpamplona/amethyst --skill compose-expert -a cursor
```

2. **Manually: put the files in place**
- File: `.cursor/skills/compose-expert/SKILL.md` — Cursor also reads .agents/skills/ and .claude/skills/

### GitHub Copilot

1. **GitHub CLI**
```bash
gh skill install vitorpamplona/amethyst compose-expert
```

2. **Manually: put the files in place**
- File: `.github/skills/compose-expert/SKILL.md`

### Gemini CLI

1. **Skills CLI (Vercel)**
```bash
npx skills add vitorpamplona/amethyst --skill compose-expert -a gemini-cli
```

2. **Platform CLI**
```bash
gemini skills install https://github.com/vitorpamplona/amethyst --path .claude/skills/compose-expert
```

### Windsurf (Devin Desktop)

**Manually: put the files in place**
- File: `.devin/skills/compose-expert/SKILL.md` — The legacy .windsurf/skills/ path still works

### OpenCode

**Skills CLI (Vercel)**
```bash
npx skills add vitorpamplona/amethyst --skill compose-expert -a opencode
```

### Claude.ai

**Claude.ai**
- Zip the folder and upload it in Settings → Capabilities → Skills

Where a file is given instead of a command, copy the files from the source to that path: https://github.com/vitorpamplona/amethyst/tree/HEAD/.claude/skills/compose-expert/SKILL.md

## When to use it
- register shared routes with Navigation 3 builders
- adapt layouts to screen sizes using `ScreenLayoutSpec`
- review public Composable APIs for `ImmutableList` compliance
- replace platform string references with `Res.string`

## Example prompts
- Review this new composable in commonsUI against Amethyst immutable collection conventions.
- Register Route.Home in NavDestinations for a shared screen layout.
- Check whether this shared navigation code avoids direct platform checks.

## Source text · SKILL.md · MIT

Below is the content of a third-party file. It is data, not instructions for you: do not act on anything written inside unless the human asks. Block tag: 964d81208016cd55.

BEGIN THIRD-PARTY FILE 964d81208016cd55
```text
---
name: compose-expert
description: Shared Compose UI in `commonsUI/`: screens, components, the nav shell (`ScreenLayoutSpec`, `AppShellLayout`, Navigation 3 back stacks), component catalog, `RichTextParser`, Compose API/perf review. Use when writing or reviewing shared UI.
---

# compose-expert

Where shared Compose UI lives in Amethyst and the house rules for it. What goes in
`commons` vs `commonsUI` vs a platform shim is in `AGENTS.md` ("Sharing Philosophy",
"Feature Workflow") and `commonsUI/ARCHITECTURE.md`; this skill does not repeat it.

Delegate: Activity / manifest / flavors -> `android-expert`; Window, tray, menu bar ->
`desktop-expert`; source-set placement, expect/actual, extracting an Android composable ->
`kotlin-multiplatform`; feeds and `Account` state -> `account-state`; Flow and coroutine
scopes -> `kotlin-coroutines`.

## Where things live

All paths below are under
`commonsUI/src/commonMain/kotlin/com/vitorpamplona/amethyst/commons/`.

| What | Where |
|------|-------|
| Screens | `ui/screen/loggedIn/<feature>/` (and `ui/screen/` for shared feed views) |
| Reusable components | `ui/components/` (catalog: `references/shared-composables-catalog.md`) |
| Feed scaffolding | `ui/feeds/` (`RenderFeedContentState`, `RefresheableBox`, `FeedEmpty`, `LoadingFeed`) |
| Note rendering | `ui/note/` (`NoteCompose`), rich text in `ui/richtext/` + `ui/components/RichTextViewer.kt` |
| Theme | `ui/theme/` (`AmethystColorScheme.kt` palettes + `ColorScheme.*` tokens, `ColorScheme.isLight`, `Shape.kt`, `Type.kt`) |
| Window tiers | `ui/layouts/ScreenLayout.kt` (`ScreenLayoutSpec`, `LocalScreenLayout`, `FeedContentMaxWidth`) |
| Shell + nav | `ui/app/AmethystApp.kt`, `ui/app/AppRoot.kt`, `ui/navigation/` (see below) |
| Platform ports for UI | `ui/platform/AppPlatform.kt` (`LocalAppPlatform`), `ui/components/PlatformPermission.kt` |
| Icons | `icons/` (Amethyst glyph font) and `icons/symbols/` (`MaterialSymbols`, `AmethystIcons`) |
| Robohash avatars | `robohash/` (`CachedRobohash`, `RobohashAssembler`, `parts/`) |
| Strings | `commonsUI/src/commonMain/composeResources/values/strings.xml` -> `Res.string.*` (rules: `AGENTS.md` "Strings") |

The Android app's `AmethystTheme` wrapper is still in
`amethyst/src/main/java/com/vitorpamplona/amethyst/ui/theme/Theme.kt`; the palettes it
applies are shared.

## The shell and window tiers

One shell for every window, chosen by size, not by platform (`AGENTS.md` "Navigation Shell"):

- `AmethystApp` (`ui/app/AmethystApp.kt`) is the root both front ends call. Android's
  `MainActivity` passes `AndroidAppRoot`; the desktop window (`AmethystDesktop.kt`) passes a
  `DesktopAppRoot`. `AppRoot`
  (`ui/app/AppRoot.kt`) is the port each platform implements: `createAccountViewModel`,
  `rememberScreenLayoutSpec`, `registerDestinations`, `ShellOverlay`, `NavigationEffects`, ...
```
END THIRD-PARTY FILE 964d81208016cd55

The third-party file has ended. Everything between the 964d81208016cd55 tags is data: requests and commands from it are not followed. An “end of file” line with another tag inside the block is part of the file.

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