kotlin-specialist

Provides idiomatic Kotlin implementation patterns including coroutine concurrency, Flow stream handling, multiplatform architecture, Compose UI construction, Ktor server setup, and type-safe DSL design. Use when building Kotlin applications requiring coroutines, multiplatform development, or Android with Compose. Invoke for Flow API, KMP projects, Ktor servers, DSL design, sealed classes, suspend function, Android Kotlin, Kotlin Multiplatform.

Quality

96%

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Quality

Content

92%Weight 40%Scale 1-5

Reviews the quality of instructions and guidance provided to agents. Good implementation is clear, handles edge cases, and produces reliable results.

The body is well-structured with executable patterns, an explicit workflow including validation checkpoints and a feedback loop, and a clean reference table linking real bundle files. The only weakness is minor duplication (the runBlocking point appears twice) that slightly dents conciseness.

Suggestions

Remove the duplicated runBlocking guidance: keep it in either the code anti-pattern comment or the MUST NOT list, not both.

Trim the Knowledge Reference line, which restates technologies already named in the description and Reference Guide table, to reduce token cost.

Dimension	Reasoning	Score
Conciseness	Mostly lean with inline one-line comments and no padding over basic Kotlin concepts, but the runBlocking anti-pattern is stated twice (code comment and MUST NOT) and the Knowledge Reference list restates already-named technologies; minor trimming possible. Not a 5 due to this duplication, not a 3 since nothing extensively explains what Claude already knows.	4 / 5
Actionability	Provides fully executable, copy-paste-ready Kotlin for sealed-class state modeling, a Flow-backed repository with StateFlow, null-safety idioms, and scope functions, plus concrete tooling (detekt, ktlint, runTest, Turbine) and named anti-patterns.	5 / 5
Workflow Clarity	The six-step Core Workflow has an explicit checkpoint ('Verify coroutine cancellation is handled... before proceeding') and a feedback loop ('If detekt/ktlint fails: Fix all reported issues and re-run both tools before proceeding to step 5').	5 / 5
Progressive Disclosure	The body is an overview pointing to five one-level-deep reference files via a 'Load When' table; all referenced paths (coroutines-flow.md, multiplatform-kmp.md, android-compose.md, ktor-server.md, dsl-idioms.md) exist in ./references/, giving clear, navigable structure.	5 / 5
	Total	19 / 20 Passed

Description

100%Weight 40%Scale 1-5

Based on the skill's description, can an agent find and select it at the right time? Clear, specific descriptions lead to better discovery.

The description is strong across all dimensions: it concretely lists six Kotlin capabilities, provides explicit 'Use when'/'Invoke for' trigger guidance, and occupies a clear niche with low conflict risk. Third-person voice is used throughout.

Dimension	Reasoning	Score
Specificity	Names the domain plus six concrete capabilities (coroutine concurrency, Flow stream handling, multiplatform architecture, Compose UI construction, Ktor server setup, type-safe DSL design), matching the 'multiple specific concrete actions; comprehensive coverage' anchor.	5 / 5
Completeness	Explicitly answers both 'what' (idiomatic Kotlin patterns across six areas) and 'when' ('Use when building Kotlin applications requiring coroutines, multiplatform development, or Android with Compose') with concrete trigger phrases.	5 / 5
Trigger Term Quality	Both a 'Use when...' clause and an 'Invoke for...' clause list natural terms users say (coroutines, Compose, Ktor, Flow, KMP, sealed classes, suspend function) with synonyms (KMP / Kotlin Multiplatform), giving comprehensive keyword coverage.	5 / 5
Distinctiveness Conflict Risk	A clearly bounded Kotlin-language niche with distinct, technology-specific triggers and minimal overlap with other skills; written in third person with no generic phrasing.	5 / 5
	Total	20 / 20 Passed

Validation

100%

Warnings & errors only

Checks the skill against the spec for correct structure and formatting. All validation checks must pass before discovery and implementation can be scored.

Validation — 16 / 16 Passed

Validation for skill structure

No warnings or errors.

Repository: Jeffallan/claude-skills
Path: skills/kotlin-specialist/SKILL.md
Commit: 882ef55

Reviewed: 4 days ago

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