Conciseness

The body is a lean router — "Load a reference below based on the task; each reference is self-contained" — with dense navigation tables and no explanations of concepts Claude already knows. It falls short of anchor 5 because the fact that .NET has no released declarative YAML config is repeated three times (setup.md's Use-when cell, the Sources of Truth note, and the Cross-References entry) within a ~37-line body — a minor trim opportunity, so anchor 4 fits better than 5 and clearly better than 3.

Actionability

Concrete, mostly executable guidance: copy-paste commands like "gh api repos/open-telemetry/opentelemetry-dotnet/releases/latest -q '.tag_name'" and a routing table whose Use-when column names the exact APIs per file. It sits at anchor 4 rather than 5 because the WebFetch/CHANGELOG rows are parameterized templates ("<PackageId>", "<core-tag>", "<package-tag>") that require assembly, and all implementation guidance is delegated to references — minor gaps at the body level.

Workflow Clarity

The body's single action is unambiguous: match the task to a reference via the explicit Use-when criteria and load that self-contained file, with the Sources of Truth table supplying fresh version facts. Per the simple-skill exception, a single unambiguous action scores 5; there are no destructive or batch operations that would require validation checkpoints.

Progressive Disclosure

Scored against the actual bundle: all five listed reference files exist (setup.md, api.md, instrumentation-libraries.md, performance.md, breaking-changes.md), are one level deep, and each is signaled with precise use-case criteria; cross-links inside references are lateral sibling pointers, not deferred-content chains. No content that belongs in separate files is inlined in the ~37-line body — matching anchor 5's 'clear overview with well-signaled one-level-deep references'.

Specificity

The description lists multiple concrete capabilities with named APIs — "DI/builder SDK setup (OpenTelemetry.Extensions.Hosting, AddOpenTelemetry, UseOtlpExporter, OpenTelemetrySdk.Create)", "native .NET instrumentation APIs (ActivitySource, System.Diagnostics.Metrics Meter)", "zero-code CLR-profiler agent", "contrib instrumentation packages, performance tuning, and breaking-change audits" — comprehensive coverage matching the top anchor. It exceeds anchor 4 because coverage spans setup, manual instrumentation, libraries, tuning, and audits rather than leaving minor gaps.

Completeness

Both questions are explicitly answered: the 'what' is the detailed capability list, and the 'when' is "Use when adding, reviewing, or configuring OpenTelemetry in a .NET or ASP.NET Core service" plus an explicit "Triggers on ..." clause with concrete trigger phrases. This matches anchor 5 exactly; anchor 4 would require the 'when' to be less explicit.

Trigger Term Quality

Natural phrases users would actually say ("setup otel in dotnet", "dotnet telemetry", ".net tracing", "ASP.NET Core opentelemetry") are combined with API identifiers ("AddOpenTelemetry", "ActivitySource") and a synonym catch-all ("any C# OTel question"), giving comprehensive coverage including variations. The catch-all covers omissions like "opentelemetry c#" or "dotnet metrics", so this fits anchor 5 rather than anchor 4's 'a few natural terms missing'.

Distinctiveness Conflict Risk

The niche is clear (OpenTelemetry specifically in .NET, with .NET-only APIs like AddOpenTelemetry/OpenTelemetrySdk.Create as triggers), but a few triggers are mildly ambiguous outside OTel: "dotnet telemetry" could match the .NET CLI telemetry feature or Application Insights questions, and "ActivitySource" can arise in non-OTel System.Diagnostics work; closely related sibling skills (otel-declarative-config, otel-sdk-versions, otel-semantic-conventions) also overlap. This is 'mostly distinct; minor overlap risk with closely related skills' (anchor 4) rather than the minimal conflict risk of anchor 5.