Conciseness

The ~25-line body carries non-obvious implementation knowledge in every line ('SharedTableEntryMap is used to track entries mapped to the same row', 'Topological sort via Multigraph (FK dependency ordering)') with zero padding and no explanation of concepts Claude already knows, matching the 'lean and efficient; assumes Claude's competence' anchor.

Actionability

It provides specific, concrete technical detail (class names, the shared-row original-value invariant, concurrency behavior), but there is no executable guidance — no test commands, source file paths, or edit procedures — so it matches 'some concrete guidance but incomplete' rather than the 'mostly executable guidance' anchor, and is clearly above the high-level-hints anchor.

Workflow Clarity

The Flow section sequences the internal pipeline clearly (SaveChanges() through AcceptAllChanges()), but it describes how the system executes rather than steps for Claude to follow, and the Validation section lists expected properties ('returns expected affected row count', 'store-generated values propagate back') without explicit checkpoints or a validate-fix-retry feedback loop — a gap the rubric caps at 3 for batch database operations.

Progressive Disclosure

The skill is under 50 lines with no bundle files and four clean, well-labeled sections (Flow, Concurrency, Shared-Row Value Access, Validation); per the simple-skill exception, well-organized sections alone justify the top anchor with no external references needed.

Specificity

Names the domain precisely ('EF Core SaveChanges and the update pipeline') and lists concrete class names (CommandBatchPreparer, UpdateSqlGenerator, ModificationCommand), but the capability statement is a generic container ('Implementation details for') rather than enumerated concrete actions, matching the 'names domain and 1-2 concrete actions' anchor rather than the 'lists several specific actions' anchor.

Completeness

It explicitly answers both questions with concrete trigger phrases: the 'what' is 'Implementation details for EF Core SaveChanges and the update pipeline' and the 'when' is 'Use when changing CommandBatchPreparer, UpdateSqlGenerator, ModificationCommand, or related classes' — a 'when' clause more specific than the anchor-4 example where the 'when' 'could be more explicit'.

Trigger Term Quality

Phrases like 'EF Core SaveChanges', 'update pipeline', 'CommandBatchPreparer', 'UpdateSqlGenerator', and 'ModificationCommand' are exactly what a developer changing this code would say, matching 'good keyword coverage; a few natural terms missing' — common variations like 'SaveChangesAsync', 'ModificationCommandBatch', or 'DbUpdateConcurrencyException' are absent, so it falls short of the comprehensive-synonym anchor.

Distinctiveness Conflict Risk

A clear niche (EF Core save-pipeline internals) with distinct triggers tied to named framework classes; it would not plausibly fire for any unrelated skill, matching the 'clear niche with distinct triggers; minimal conflict risk' anchor.