npx skills add sickn33/agentic-awesome-skills --skill kotlin --agent claude-code
Same command for any agent — swap --agent for codex, cursor, copilot.
Weekly change comes from our own snapshots, not the repository page — it measures attention, not adoption.
# Kotlin + Compose: Idiomatic Efficiency Reference ## When to Use - Use this skill when the task matches this description: Language-specific super-code guidelines for kotlin. ## Table of Contents 1. [Collections & Data Transformation](#collections) 2. [Null Safety](#null-safety) 3. [Functions & Lambdas](#functions) 4. [Classes & Objects](#classes) 5. [Coroutines & Flow](#coroutines) 6. [Compose UI](#compose) 7. [Anti-patterns specific to Kotlin](#antipatterns) --- ## 1. Collections & Data Transformation {#collections} **Prefer scope functions and stdlib transforms over imperative loops.** ```kotlin // ❌ Verbose val result = mutableListOf<String>() for (item in items) { if (item.isActive) { result.add(item.name.uppercase()) } } // ✅ Idiomatic val result = items.filter { it.isActive }.map { it.name.uppercase() } ``` ```kotlin // ❌ Manual grouping val map = mutableMapOf<String, MutableList<Item>>() for (item in items) { map.getOrPut(item.category) { mutableListOf() }.add(item) } // ✅ val map = items.groupBy { it.category } ``` ```kotlin // ❌ Manual fold var total = 0 for (order in orders) total += order.amount // ✅ val total = orders.sumOf { it.amount } ``` **Use `associate`, `associa
- When to Use
- Table of Contents
- 1. Collections & Data Transformation {#collections}
- 2. Null Safety {#null-safety}
- 3. Functions & Lambdas {#functions}
- 4. Classes & Objects {#classes}
- 5. Coroutines & Flow {#coroutines}
- 6. Compose UI {#compose}
- 7. Anti-patterns specific to Kotlin {#antipatterns}
- Limitations
What does the kotlin skill do?
Language-specific super-code guidelines for kotlin.
How do I install it?
Run `npx skills add sickn33/agentic-awesome-skills --skill kotlin --agent claude-code` — it drops the skill into your project so the agent can pick it up. Swap the --agent value for codex, cursor or copilot if you use one of those.
Where does this skill come from?
From sickn33/agentic-awesome-skills, a repository with 44,414 stars. We read it straight from the repository tree rather than a submitted listing, so what you see here is what is actually published.
Is a popular skill a good skill?
Not necessarily. Stars measure attention, not adoption — a repository can trend for a week and be abandoned. That is why we show the weekly change from our own snapshots next to the total, instead of a single flattering number.