Conciseness

The body is dense — rules in tables, complete code blocks, terse gotchas — and explains only OrchardCore-specific behavior Claude cannot be assumed to know ('OrchardCore discovers its methods by reflection and runs them sequentially, per tenant'). Not a 5 because of minor redundancy: the intro paragraph restates the version chain that 'The version-chain rule' section then tabulates, and the opening line 'This skill guides you through...' is boilerplate that could be trimmed.

Actionability

Mostly executable guidance: a complete class skeleton with usings and DI, the registration one-liner 'services.AddDataMigration<Migrations>();', a full AlterPartDefinitionAsync example, and a full UpdateFrom1Async body. Not a 5 because the first CreateAsync example is a template with a '// ... define schema ...' placeholder, and the Quick Reference tables give API names rather than runnable calls.

Workflow Clarity

The 5-step workflow is clearly sequenced and includes explicit validation — Step 5 requires testing a fresh install, an upgrade from the previous version, and every targeted provider (SQLite/SQL Server/MySQL/PostgreSQL) with a provider-quirk guard. This satisfies the validation requirement for schema-changing batch operations, so no cap applies. Not a 5 because there is no error-recovery feedback loop (what to do when a test fails beyond the try/catch note).

Progressive Disclosure

Clear overview structure with two well-signaled, one-level-deep references that exist on disk ('references/patterns.md — content definition changes, content-item data patching, recipe migrations'; 'references/schema-builder.md — index tables, columns, indexes, provider quirks'), plus targeted inline pointers in Step 5 and Gotchas. The body keeps core rules and quick-reference tables inline while details live in the reference files — appropriately split and easy to navigate.

Specificity

Multiple concrete actions are named: 'Creates and updates OrchardCore data migrations (DataMigration classes with CreateAsync/UpdateFromX)', 'alter content type definitions, create or change SQL index tables, patch existing content items, run a recipe migration, or version a module's schema' — comprehensive coverage of the skill's capabilities. Not a 4 because coverage spans essentially every operation the skill supports, matching the level of the top anchor.

Completeness

Explicitly answers both: what ('Creates and updates OrchardCore data migrations (DataMigration classes with CreateAsync/UpdateFromX)') and when ('Use when the user needs to alter content type definitions, create or change SQL index tables, patch existing content items, run a recipe migration, or version a module's schema') with concrete trigger phrases. Matches the top anchor exactly.

Trigger Term Quality

Good natural-term coverage: 'alter content type definitions', 'SQL index tables', 'patch existing content items', 'recipe migration', 'version a module's schema' — phrases an OrchardCore developer would actually say. Not a 5 because common variations like 'content parts/fields', 'schema upgrade', or naming the migration methods as triggers are absent.

Distinctiveness Conflict Risk

The 'OrchardCore data migrations' niche is highly specific with distinct triggers ('recipe migration', 'UpdateFromX', 'SQL index tables'); minimal risk of triggering for an unrelated skill. Not lower because the domain framing and trigger list leave essentially no overlap with generic migration or database skills.