Conciseness

The body is efficient and stays on AppMigrationKit-specific facts Claude would not know (entitlement values, archiver cancellation behavior, app-group clearing); no filler explaining known concepts. Minor trimming is possible — the Contents TOC, the key-types table that repeats later prose, and WRONG/CORRECT pairs with placeholder signatures — placing it between anchors 4 and 5, closer to 4.

Actionability

Mostly executable guidance: concrete entitlement XML and Swift code for export (appendItem with pathInArchive), import, MigrationStatus handling, progress updates, and an AppMigrationTester round-trip test. Minor gaps come from placeholder helpers (estimateTotalExportSize(), calculateExportSize(), performImport(), processFile()) and 'request: ...' elisions in the Common Mistakes examples, keeping it below anchor 5's copy-paste-ready bar.

Workflow Clarity

The sections follow a coherent sequence (setup/entitlement → export → import → status → testing) and the Review Checklist plus the AppMigrationTester example provide validation checkpoints for this destructive/batch operation. However, the flow is organized by topic rather than as an explicit step sequence with per-step validation and retry loops, so it sits between anchors 4 and 5 rather than at 5.

Progressive Disclosure

Verified against the actual bundle: references/appmigrationkit-patterns.md exists (738 lines) and is clearly signaled twice — in the Testing section and the References section with a description of its contents (combined extension, versioned migration, error recovery). The reference is one level deep, the split is appropriate (extended patterns out of SKILL.md), and the Contents TOC aids navigation, matching anchor 5.

Specificity

The description lists multiple concrete actions with comprehensive coverage: "building an AppMigrationExtension, packaging transportable resources with ResourcesArchiver, importing resources on the destination device, reporting import progress, handling migration errors and app group cleanup, checking MigrationStatus, or testing migration code with AppMigrationTester". It covers the full workflow (export, import, progress, errors, status, testing), so it matches the anchor 5 example rather than the 'minor gaps' of 4.

Completeness

It explicitly answers both: what ("Transfer app data to or from other platforms using AppMigrationKit") and when ("Use when implementing system-orchestrated one-time migration...") with concrete trigger phrases. This matches anchor 5; it is clearly above anchor 4, whose 'when' is less explicit.

Trigger Term Quality

Good natural-language keyword coverage ("Transfer app data", "migration between iOS and Android") plus the specific API names a user might mention. A few natural synonyms are missing — e.g., 'move app data to a new phone/device', 'device-to-device transfer', 'switching platforms' — so it falls just short of the comprehensive anchor 5.

Distinctiveness Conflict Risk

It carves out a clear niche — system-orchestrated one-time cross-platform migration via AppMigrationKit — with triggers tied to specific framework names and migration tasks, so conflict with other skills is minimal. Anchor 5 is the best fit.