Conciseness

The body is lean and assumes competence (it never explains what Kotlin, Dagger, or SRP are), and commands are given tersely. Minor trimmable padding keeps it at anchor 4: the persona framing 'The Distiller ⚗️ — a domain-layer agent obsessed with...' and the four-bullet Philosophy section, which largely restate the constraints.

Actionability

Concrete, executable guidance is present: real commands ('./gradlew ktfmtFormat', './gradlew lintDebug', './gradlew testDebugUnitTest'), a real class shape ('class ValidatePasswordUseCase @Inject constructor()'), the 'operator fun invoke()' pattern, and a copy-paste commit example ('ref: extract password strength validation into ValidatePasswordUseCase'). It falls short of anchor 5 only because there is no complete, copy-paste-ready Kotlin code block showing a finished Use Case.

Workflow Clarity

The five-step process (SCAN, SELECT & PROPOSE, DISTILL, VERIFY, PRESENT) is clearly sequenced with an explicit user-approval checkpoint before code changes and a VERIFY step that runs formatting, lint, and unit tests — so the batch-operation validation cap does not apply. It stops at anchor 4 because there is no explicit error-recovery loop (what to do when lint or tests fail and when to re-run).

Progressive Disclosure

The body is under 50 lines with no bundle files (references/, scripts/, assets/ are absent), yet is cleanly organized into Goal, Constraints (Always/Ask-first/Never), Instructions, and Examples sections. The only file reference, '.agents/skills/distiller/journal.md', is one level deep and clearly signaled, matching the simple-skill exception for scoring 5 with well-organized sections alone.

Specificity

The description states one concrete, well-specified action — 'Extracts duplicated or tangled business logic from ViewModels, Repositories, or UI components into pure, highly testable Kotlin Use Cases (Interactors) following the Single Responsibility Principle' — with named sources and a concrete target artifact. It sits at anchor 4 rather than 5 because it describes a single extraction action rather than multiple discrete actions, and above anchor 3 because the action's inputs, outputs, and technology are fully specified.

Completeness

It explicitly answers both questions: what ('Extracts duplicated or tangled business logic ... into pure, highly testable Kotlin Use Cases') and when ('Use this skill to decouple Android dependencies from business rules, create domain-layer interactors, or reduce ViewModel bloat'). This mirrors the 5-anchor example structure of a concrete what followed by an explicit trigger clause; the 4 anchor would require a less specific when-clause.

Trigger Term Quality

Phrases like 'ViewModel bloat', 'decouple Android dependencies from business rules', 'create domain-layer interactors', 'Use Cases (Interactors)', and 'Kotlin' are exactly what a user would naturally say, and the description includes synonyms ('Use Cases (Interactors)', 'domain-layer interactors'). Coverage matches the comprehensive-synonyms anchor.

Distinctiveness Conflict Risk

It occupies a clear niche — Android/Kotlin domain-layer extraction into Use Cases — with distinct triggers ('reduce ViewModel bloat', 'domain-layer interactors') that are unlikely to fire for other skills. Only an extremely generic refactoring skill could overlap, which is minimal risk.