Conciseness

The body is lean and assumes Claude's competence — no basic OpenTelemetry explanations, and constraints are stated as terse imperatives ('PROPAGATION FIRST', 'NO SENSITIVE DATA'). Not score 5 because the 'When to use this skill' section repeats the description's trigger list verbatim, and the 'What is covered' bullets partially restate the description. Not score 3: there is no concept over-explanation or padding.

Actionability

There is some concrete guidance — the explicit 'VERIFY: Run `./mvnw clean verify` or `mvn clean verify`' command and named constraints — but the workflow steps remain directive-level ('Record status/errors/events consistently', 'configure sampling/exporters') with no inline code or specific API/dependency detail; the executable detail lives entirely in the reference file. Fits the score-3 anchor 'some concrete guidance but incomplete; missing key details' better than score 4's 'mostly executable guidance'.

Workflow Clarity

A clear four-step sequence (define trace model → instrument and propagate → harden spans/sampling → validate end-to-end) with a validation checkpoint present (the VERIFY constraint and step 4). Not score 5: there is no feedback loop describing what to do when verification fails, and checkpoints are named rather than embedded as explicit retry steps. Not score 3: validation is explicitly present, and tracing instrumentation is not a destructive/batch operation that would cap the score.

Progressive Disclosure

The body is a concise overview that delegates all detailed guidance to a single, clearly signaled, one-level-deep reference — 'For detailed guidance, examples, and constraints, see [references/183-java-observability-tracing-opentelemetry.md]' — and the referenced file exists and contains no nested references. Matches the anchor for a clear overview with well-signaled one-level-deep references and easy navigation.

Specificity

Enumerates multiple concrete capabilities — 'trace/span modeling, context propagation, semantic conventions, span attributes/events/status, sampling strategy, baggage usage, privacy safeguards, and backend integration with OTLP collectors' — covering the domain comprehensively with no significant gaps. Matches the anchor for comprehensive, specific concrete actions rather than the score-4 anchor with 'minor gaps in coverage'.

Completeness

Explicitly answers both 'what' (the enumerated capability list: span modeling, context propagation, sampling, privacy, OTLP integration) and 'when' ('Use when you need to implement or improve distributed tracing with OpenTelemetry in Java' plus 'This should trigger for requests such as...'). Matches the anchor for clearly and explicitly answering both with concrete trigger phrases.

Trigger Term Quality

Explicitly lists natural user phrasings — 'Improve tracing; Apply OpenTelemetry tracing; Add distributed tracing; Refactor tracing instrumentation; Instrument Java services with OpenTelemetry spans' — covering synonyms (tracing, distributed tracing, instrumentation, spans, OpenTelemetry) a user would naturally say. Not score 4: no meaningful natural terms are missing for this domain.

Distinctiveness Conflict Risk

A clear niche — Java + OpenTelemetry + distributed tracing — with distinct, specific triggers; overlap risk is limited to closely adjacent observability skills at most. 'Part of Plinth Toolkit' further disambiguates it from unrelated tracing skills. Matches the clear-niche/minimal-conflict anchor rather than the score-4 anchor with notable overlap risk.