Conciseness

The ~1600-line body extensively explains concepts Claude already knows — Maybe/Option and Result mapping, basic pattern matching, records, DUs, computation expressions, smart constructors, railway-oriented programming (sections 1 and 8) — matching 'noticeably verbose; several unnecessary explanations or padded sections'. It is also heavily duplicated: the Myriad-vs-manual decision tree appears three times (sections 3, 9, 10) and the opaque-type UserId example three times (sections 1, 2, 8). Not a 1 only because substantial project-specific content (Myriad MSBuild integration, Morphir IR fidelity, script usage) genuinely earns its tokens.

Actionability

Mostly executable guidance: real script invocations ('dotnet fsi scripts/analyze-elm-module.fsx path/to/module.elm'), copy-paste MSBuild snippets, complete F# JSON-context and test examples, and concrete decision matrices. Minor gaps keep it from 5: the Myriad plugin skeleton calls undefined helpers ('parseInputTypes context', 'generateCode inputTypes') and generated-code examples contain literal ellipses ('new Utf8JsonWriter(...)').

Workflow Clarity

Section 9 gives a four-phase workflow with per-phase checklists, explicit validation commands (verify-compatibility.fsx, 'Test with PublishTrimmed=true', 'Verify JSON roundtrip'), and section 16 adds an 11-step getting-started sequence. Feedback loops for error recovery are explicit via the AOT Guru and QA Tester handoff workflows ('Addressing AOT Guru feedback: Adding TrimmerRootDescriptor.xml'), matching the top anchor.

Progressive Disclosure

The body is a monolithic 1600 lines where content that clearly belongs in separate files is inlined: full language tutorials and complete pattern-catalog entries that the skill itself says live in 'patterns/' files. Scoring against the actual bundle, the six referenced scripts/ files are real and well documented, but the referenced 'patterns/' (8 files) and 'templates/' (6 files) directories do not exist in the bundle at all — dangling references. Not a 3 because the inlining is pervasive rather than incidental and navigation to the promised detailed material is impossible.

Specificity

Quotes several concrete actions — 'converting Elm code from finos/morphir-elm to idiomatic F#', 'implementing Myriad code generation', 'translating UI code to Fun.Blazor', 'migrating Elm modules' — matching the anchor for several specific actions. Not a 5 because test migration and pattern-catalog work, major documented responsibilities of the skill, are absent, leaving minor gaps in coverage.

Completeness

Explicitly answers both questions: what it does ('converting Elm code from finos/morphir-elm to idiomatic F# while maintaining AOT compatibility, type safety, and behavioral equivalence') and when to use it ('Use when migrating Elm modules, converting patterns, implementing Myriad code generation, or translating UI code to Fun.Blazor' plus a concrete trigger list). This matches the anchor for clearly and explicitly answering both with concrete trigger phrases.

Trigger Term Quality

Good natural keyword coverage including synonyms ('convert elm', 'translate elm', 'elm architecture') and specific tool names ('morphir-elm', 'myriad', 'fun.blazor'). Not a 5 because common variations users would say — 'F#', 'port to F#', the '.elm' file extension — are missing; not a 3 because coverage goes well beyond a couple of generic keywords.

Distinctiveness Conflict Risk

Clear niche (Elm-to-F# for morphir-dotnet) with distinctive triggers like 'morphir-elm', 'myriad', 'fun.blazor'. Not a 5 because the generic triggers 'elm' and 'migration' create minor overlap risk with general Elm-development or generic migration skills, matching the 'mostly distinct; minor overlap risk' anchor.