Conciseness

The body is lean and assumes Claude's competence — it never explains what OpenTelemetry or spans are, and the code example and sampling section carry non-obvious house rules (log-record exceptions instead of span.recordException, AlwaysOn rationale tied to the traceparent trust boundary) rather than general knowledge. The only trace of padding is the one-line 'Expert guidance' tagline, which is too minor to drop it from the top anchor.

Actionability

Guidance is fully executable: a copy-paste-ready Node.js span example covering the common case (attributes, status, error handling, trace/span correlation), the concrete env var OTEL_TRACES_SAMPLER=always_on, and numbered steps pointing to specific rule files. It is not 4 because no key execution detail is missing inline.

Workflow Clarity

The 'Getting started' section gives a clear 5-step sequence ending in an explicit validation step that references the validation checklist, so checkpoints are mostly present. It falls short of 5 because the validate-fix-retry feedback loop is deferred to the referenced validation rule rather than written inline, and the diagram/entrypoint routing assumes the reader lands on the telemetry rule first.

Progressive Disclosure

The body is a true overview: a well-organized table of 21 one-level-deep rule files, each with a one-line purpose and a marked Entrypoint, with language SDKs grouped under sdks/ and getting-started steps routing into the table. This matches the top anchor (clear overview, well-signaled one-level-deep references, easy navigation); no bundle files were provided to verify, but the structure as written is exemplary.

Specificity

It lists four concrete, parallel actions — 'Configures trace spans, defines custom metrics, sets up log exporters, and optimizes sampling strategies' — covering all three OTel signals plus sampling, which is comprehensive for this domain. It is not 4 because there are no coverage gaps across the skill's stated scope.

Completeness

Both halves are explicit: the 'what' is the four concrete capabilities, and the 'when' is 'Use when instrumenting applications with traces, metrics, or logs. Triggers on requests for observability, telemetry, tracing, metrics collection, logging integration, or OTel setup.' This mirrors the rubric's top-anchor example pattern exactly.

Trigger Term Quality

Natural trigger terms are comprehensive: 'tracing', 'telemetry', 'observability', 'metrics collection', 'logging integration', 'instrumenting', plus both the full name 'OpenTelemetry' and the synonym 'OTel'. It is not 4 because the common user phrasings for this niche are present, including the abbreviation synonym.

Distinctiveness Conflict Risk

The OTel-instrumentation niche is clear and mostly distinct, but broad triggers like 'observability', 'metrics collection', and 'logging integration' could overlap with closely related skills — the body itself references a sibling otel-collector skill covering the sampling/collector side. This fits 4 ('mostly distinct; minor overlap risk with closely related skills') better than 5 ('minimal conflict risk').