Conciseness

The body is lean and information-dense: repo-specific paths, component names, and ownership rules with zero padding and no explanation of concepts Claude already knows. Every token earns its place, matching anchor 5 rather than 4 (which allows minor over-explanation).

Actionability

Concrete, executable guidance dominates: exact paths ('src/ef/Commands/', 'test/dotnet-ef.Tests/'), specific method names ('Reporter.WriteInformation()', 'IOperationExecutor.AddMigration()'), and runnable commands ('dotnet build' / 'dotnet publish' with 'EFOptimizeContext=true', 'dotnet ef migrations script'). Minor gaps keep it at anchor 4 rather than 5 — 'manually run affected commands to verify behavior' and 'create a test project' are underspecified compared to the copy-paste-ready rest.

Workflow Clarity

A coherent progression is present: trace option ownership before changing contracts, keep changes on the right surface, then test and validate via named projects and commands. The Validation section provides checkpoints ('output matches expected DDL'), but feedback loops for failure recovery are absent and some checks are implicit, matching anchor 4 rather than 5.

Progressive Disclosure

The body is under 50 lines with clean, well-organized sections and no external bundle files are needed or referenced (no references/, scripts/, or assets/ exist). Per the guidelines, a short single-file skill with well-organized sections scores 5; there are no buried or dangling references to pull it lower.

Specificity

The description names the domain precisely ('EF Core dotnet-ef CLI and tooling') and enumerates concrete components ('dotnet-ef commands, the ef wrapper, EFCore.Tools (PMC), or EFCore.Tasks MSBuild integration'), but states no concrete capability actions — migrations, scaffolding, or compiled models appear only in the body, not the description. This matches anchor 3 (domain plus 1-2 concrete elements, not comprehensive) rather than 4, which requires several specific actions.

Completeness

It explicitly answers both 'what' ('Implementation details for the EF Core dotnet-ef CLI and tooling') and 'when' ('Use when changing dotnet-ef commands, the ef wrapper, EFCore.Tools (PMC), or EFCore.Tasks MSBuild integration') with concrete trigger phrases, matching anchor 5. It is not a 4 because the 'when' clause is already fully explicit and specific.

Trigger Term Quality

It includes the exact terms a contributor would naturally say ('dotnet-ef', 'EFCore.Tools', 'PMC', 'EFCore.Tasks', 'MSBuild'), but misses common variations and synonyms such as 'Package Manager Console' spelled out, 'migrations', or the PowerShell cmdlet names. Good coverage with a few natural terms missing matches anchor 4, not 5's comprehensive synonym/extension coverage.

Distinctiveness Conflict Risk

A clear niche — EF Core tooling internals across three named surfaces — with distinct trigger terms and minimal overlap risk against adjacent EF Core skills. Anchor 5 fits; it is not generic enough to fall to 4's 'minor overlap risk with closely related skills'.