Kotlin language fundamentals - syntax, null safety, data classes, extensions
Provides Kotlin-specific guidance on null safety operators, data classes, and scope functions when reviewing or writing Kotlin code.
/plugin marketplace add pluginagentmarketplace/custom-plugin-kotlin/plugin install kotlin-assistant@pluginagentmarketplace-kotlinThis skill inherits all available tools. When active, it can use any tool Claude has access to.
assets/build.gradle.kts.templateassets/config.yamlreferences/GUIDE.mdscripts/lint.shMaster Kotlin programming fundamentals with production-ready patterns.
// Safe call + Elvis
val name = user?.name ?: "Anonymous"
// requireNotNull for validation
requireNotNull(user) { "User required" }
data class User(val id: Long, val name: String) {
init { require(name.isNotBlank()) }
}
| Function | Context | Returns | Use Case |
|---|---|---|---|
let | it | Lambda result | Null-safe transforms |
apply | this | Same object | Object configuration |
run | this | Lambda result | Object scope + result |
also | it | Same object | Side effects |
| Issue | Resolution |
|---|---|
| NPE despite null check | Check platform types from Java |
| Smart cast fails | Use local variable or let |
Skill("kotlin-fundamentals")
This skill should be used when the user asks to "create a slash command", "add a command", "write a custom command", "define command arguments", "use command frontmatter", "organize commands", "create command with file references", "interactive command", "use AskUserQuestion in command", or needs guidance on slash command structure, YAML frontmatter fields, dynamic arguments, bash execution in commands, user interaction patterns, or command development best practices for Claude Code.
This skill should be used when the user asks to "create an agent", "add an agent", "write a subagent", "agent frontmatter", "when to use description", "agent examples", "agent tools", "agent colors", "autonomous agent", or needs guidance on agent structure, system prompts, triggering conditions, or agent development best practices for Claude Code plugins.
This skill should be used when the user asks to "create a hook", "add a PreToolUse/PostToolUse/Stop hook", "validate tool use", "implement prompt-based hooks", "use ${CLAUDE_PLUGIN_ROOT}", "set up event-driven automation", "block dangerous commands", or mentions hook events (PreToolUse, PostToolUse, Stop, SubagentStop, SessionStart, SessionEnd, UserPromptSubmit, PreCompact, Notification). Provides comprehensive guidance for creating and implementing Claude Code plugin hooks with focus on advanced prompt-based hooks API.