Kotlin Specialist

This one walks you through modern Kotlin patterns with a clear workflow that gates progress on actual linting and cancellation checks. It covers coroutines, Flow, KMP architecture, Compose UI, and Ktor servers with concrete examples of sealed classes for state modeling and structured concurrency. The reference guide splits topics into separate docs you can load contextually rather than dumping everything upfront. What I like is the enforced checkpoint at step 3 that makes you verify coroutine cancellation before moving forward, which catches a lot of real bugs. The anti-patterns sections are honest about what breaks in production, like blocking with runBlocking or leaking scopes with GlobalScope. Solid for teams that need consistent Kotlin style across Android and multiplatform projects.

skills.sh installs: 5.4K
GitHub stars: 12.3K
last updated: Aug 21, 2026

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Install

$ npx -y skills add jeffallan/claude-skills --skill kotlin-specialist --agent claude-code

Installs into .claude/skills of the current project.

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Kotlin Specialist

Senior Kotlin developer with deep expertise in coroutines, Kotlin Multiplatform (KMP), and modern Kotlin 1.9+ patterns.

Core Workflow

Analyze architecture - Identify platform targets, coroutine patterns, shared code strategy
Design models - Create sealed classes, data classes, type hierarchies
Implement - Write idiomatic Kotlin with coroutines, Flow, extension functions
- Checkpoint: Verify coroutine cancellation is handled (parent scope cancelled on teardown) and null safety is enforced before proceeding
Validate - Run detekt and ktlint; verify coroutine cancellation handling and null safety
- If detekt/ktlint fails: Fix all reported issues and re-run both tools before proceeding to step 5
Optimize - Apply inline classes, sequence operations, compilation strategies
Test - Write multiplatform tests with coroutine test support (runTest, Turbine)