Individual skill
using-efficient-effects
Use this skill to choose the cheapest correct effect API in Jetpack Compose — `LaunchedEffect`, `DisposableEffect`, `SideEffect`, `rememberUpdatedState`, and skydoves/compose-effects' `RememberedEffect` and `ViewModelStoreScope`. Covers stale-callback bugs in long-lived `LaunchedEffect`, setup/teardown for non-coroutine subscribers, avoiding a coroutine scope just to react to a key change, and per-row ViewModels in a `LazyColumn`. Trigger when the user mentions LaunchedEffect, DisposableEffect, RememberedEffect, SideEffect, rememberUpdatedState, ViewModelStoreScope, effect restarts unexpectedly, leaked listener, or per-item ViewModel.
side-effects/using-efficient-effects/SKILL.md
Source commit 1b32f81724c0d71fe9ef093ca44697f559fdab6e
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- Matches the observed repository HEAD
- Yes
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- No
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- Observed behavior
- Not checked yet
- Last checked
- Nov 6, 2026
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Repository context
- Repository stars (not skill ratings)
- 526
- Repository last updated
- Jun 16, 2026
- License
- Apache-2.0
Observed agent integration: No specific integration evidence. Standard SKILL.md installation does not imply verified compatibility.
- agent-skills Repository topic
- android Repository topic
- claude Repository topic
- claude-code Repository topic
- compose Repository topic
- jetpack-compose Repository topic
- kotlin Repository topic
- llm-tools Repository topic
- recomposition Repository topic
- skydoves Repository topic
- engineering Derived category
- engineering-web Derived category
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# Using Efficient Effects — pick the cheapest correct effect API
Compose ships three effect APIs by default: `LaunchedEffect` (coroutine, restarts on key change), `DisposableEffect` (setup/teardown with a cleanup block), and `SideEffect` (runs on every successful composition). The `skydoves/compose-effects` library adds `RememberedEffect` — a non-coroutine analog of `LaunchedEffect`. Picking the wrong API wastes a coroutine scope, leaks a listener, or silently drops the latest version of a callback. This skill is the decision tree.
## When to use this skill
- The user asks which effect API to choose, or why a `LaunchedEffect` restarts unexpectedly.
- A long-lived `LaunchedEffect` calls a stale version of a callback that the parent has updated.
- A non-Compose subscriber (listener, observer, broadcast receiver, GL surface) needs setup at composition entry and teardown on key change or exit.
- A composable just needs to react to a key change synchronously and a coroutine scope is overkill.
- A `LazyColumn` row needs its own `ViewModel` instance (e.g. one VM per chat row, one VM per feed card) and the parent VM store would leak state across rows.
- The user is debugging unexpected effect restarts, leaked listeners, or per-frame allocations from `SideEffect`.
## When NOT to use this skill