The description says 'deep dive into Evernote data migration strategies' but never lists concrete actions like 'export notes as ENEX files', 'map tags to folders', or 'convert attachments'. 'Deep dive' and 'strategies' are vague, abstract language.

The 'when' is explicitly addressed with 'Use when migrating to/from Evernote, bulk data transfers, or complex migration scenarios' plus trigger phrases. However, the 'what' is weak — it only says 'deep dive into strategies' without specifying what concrete actions or outputs the skill provides, so it partially answers both but the 'what' is too vague to earn a 3.

Includes natural trigger phrases like 'migrate to evernote', 'migrate from evernote', 'evernote data transfer', 'bulk evernote migration' which are terms users would naturally say. Good coverage of common variations.

Evernote data migration is a very specific niche. The triggers are clearly scoped to Evernote migration scenarios, making it unlikely to conflict with other skills like general note-taking or other migration tools.

The skill has some unnecessary padding (e.g., the Overview paragraph restating what the title already conveys, the Prerequisites section listing things Claude already knows like 'understanding of Evernote data model'), but the code examples and error table are reasonably efficient. The Examples section at the end describes scenarios in prose rather than showing them, which is wasted space.

Steps 1 and 2 provide executable JavaScript code, but Step 3 and Step 4 are purely descriptive with no code at all—just vague instructions like 'Convert source data to ENML format' and 'Build a migration runner.' The ENML conversion (arguably the hardest part) has no concrete implementation. The reference to an implementation guide that doesn't exist in the bundle further reduces actionability.

The four steps provide a reasonable sequence, and the error handling table is helpful. However, there are no explicit validation checkpoints between steps—Step 3 mentions 'verify each import by comparing note counts and content hashes' but provides no code or concrete validation commands. For a destructive/bulk migration operation, the lack of explicit feedback loops (validate -> fix -> retry) caps this at 2.

The skill references 'references/implementation-guide.md' which doesn't exist in the bundle, making it a broken reference. The Resources section links to external Evernote docs (fine), but the core promise of the skill—the full migration planner, ENEX parser, format converters, migration runner, and verification tools—is deferred to a non-existent file. This is effectively a dead-end reference.