Conciseness

The body is lean, command-driven, and avoids explaining concepts Claude already knows (no "what is .NET" filler), with genuinely non-obvious notes like "Reference assemblies do not contain implementations" and ReadyToRun/trimming caveats. It stays at 4 rather than 5 because the Quick start and Commands sections duplicate the same basic invocations ("ilspycmd MyLibrary.dll", "-o") and the dnx/ilspycmd duality is explained twice. Not 3 — the padding is minor and easily trimmed.

Actionability

Mostly executable guidance: concrete install command ("dotnet tool install --global ilspycmd"), real invocations with flags (-o, -p, -t, -lv, -il), and copy-pasteable path patterns for NuGet caches and build output. Not 5 because the workflow's "List types" step has no corresponding command shown, and the -t example gives no hint for namespaces/nested types. Not 3 because everything shown runs as written.

Workflow Clarity

The "Core workflow" lists a sequence (identify → locate → list types → decompile) but the steps are generic and unbacked by commands — "List types" has no matching ilspycmd invocation anywhere in the body, and there are no checkpoints (e.g., confirm the type exists before decompiling, or check output was produced). This matches anchor 3 (sequence present, checkpoints missing); the read-only nature avoids the destructive-cap, but it falls short of anchor 4's embedded per-step commands.

Progressive Disclosure

No bundle files exist (no references/, scripts/, or assets/), and none are needed: the single SKILL.md is compact with clear, well-ordered sections (Prerequisites, Quick start, Locations, Commands, Notes, Legal) and zero reference chains. Every section is one glance away and nothing that belongs in a separate file is inlined, matching the well-organized-sections ideal for a self-contained skill.

Specificity

The description lists several concrete capabilities — "see how a .NET API works internally, inspect NuGet package source, view framework implementation, or understand compiled .NET binaries" — which is 4-level coverage, but the second-person phrasing "Use when you want to see" triggers the rubric's voice penalty (−1), landing it at 3. It sits below 4 because the penalty applies and above 2 because the domain and multiple concrete actions are explicitly named.

Completeness

Clearly answers both: what ("Understand implementation details of .NET code by decompiling assemblies") and when ("Use when you want to see how a .NET API works internally, inspect NuGet package source, view framework implementation, or understand compiled .NET binaries") with concrete trigger phrases. This matches the 5 anchor exactly.

Trigger Term Quality

Good natural keyword coverage: ".NET", "decompiling", "assemblies", "NuGet package", "framework implementation", "compiled .NET binaries" — phrases users would plausibly say. Not 5 because common variations like ".dll", "IL", or "source code" are missing; not 3 because coverage goes well beyond a single generic keyword.

Distinctiveness Conflict Risk

A clear niche — .NET assembly decompilation — with distinct triggers ("decompiling assemblies", "NuGet package source", "compiled .NET binaries") unlikely to fire for unrelated skills. Only marginally overlapping with generic code-reading requests, which keeps it at 5 rather than 4.