Coil Compose Agent Skill

Expert guidance on using Coil for image loading in Jetpack Compose. Use this when asked about loading images from URLs, handling image states, or optimizing image performance in Compose.

788 tokens

context cost

SKILL.md, read when the skill is used

files

instructions only

copies elsewhere

how many repositories repackaged it

910

stars on the repo

on the repository, not the skill itself

Install

one command, takes just this skill from the repository

npx skills add https://github.com/new-silvermoon/awesome-android-agent-skills --skill coil-compose

The instruction itself

7 sections, as written by the author

Coil for Jetpack Compose

Instructions

When implementing image loading in Jetpack Compose, use Coil (Coroutines Image Loader). It is the recommended library for Compose due to its efficiency and seamless integration.

1. Primary Composable: `AsyncImage`

Use AsyncImage for most use cases. It handles size resolution automatically and supports standard Image parameters.

AsyncImage(
    model = ImageRequest.Builder(LocalContext.current)
        .data("https://example.com/image.jpg")
        .crossfade(true)
        .build(),
    placeholder = painterResource(R.drawable.placeholder),
    error = painterResource(R.drawable.error),
    contentDescription = stringResource(R.string.description),
    contentScale = ContentScale.Crop,
    modifier = Modifier.clip(CircleShape)
)

2. Low-Level Control: `rememberAsyncImagePainter`

Use rememberAsyncImagePainter only when you need a Painter instead of a composable (e.g., for Canvas or Icon) or when you need to observe the loading state manually.

> [!WARNING]

> rememberAsyncImagePainter does not detect the size your image is loaded at on screen and always loads the image with its original dimensions by default. Use AsyncImage unless a Painter is strictly required.

val painter = rememberAsyncImagePainter(
    model = ImageRequest.Builder(LocalContext.current)
        .data("https://example.com/image.jpg")
        .size(Size.ORIGINAL) // Explicitly define size if needed
        .build()
)

3. Slot API: `SubcomposeAsyncImage`

Use SubcomposeAsyncImage when you need a custom slot API for different states (Loading, Success, Error).

> [!CAUTION]

> Subcomposition is slower than regular composition. Avoid using SubcomposeAsyncImage in performance-critical areas like LazyColumn or LazyRow.

SubcomposeAsyncImage(
    model = "https://example.com/image.jpg",
    contentDescription = null,
    loading = {
        CircularProgressIndicator()
    },
    error = {
        Icon(Icons.Default.Error, contentDescription = null)
    }
)

4. Performance & Best Practices

Singleton ImageLoader: Use a single ImageLoader instance for the entire app to share the disk/memory cache.
Main-Safe: Coil executes image requests on a background thread automatically.
Crossfade: Always enable crossfade(true) in ImageRequest for a smoother transition from placeholder to success.
Sizing: Ensure contentScale is set appropriately to avoid loading larger images than necessary.

5. Checklist for implementation

[ ] Prefer AsyncImage over other variants.
[ ] Always provide a meaningful contentDescription or set it to null for decorative images.
[ ] Use crossfade(true) for better UX.
[ ] Avoid SubcomposeAsyncImage in lists.
[ ] Configure ImageRequest for specific needs like transformations (e.g., CircleCropTransformation).

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How to use it

Copy the folder

Take new-silvermoon/coil-compose from the repository into ~/.claude/skills for personal use, or into .claude/skills inside a project.

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