Conciseness

The body is efficient and assumes competence — it never explains what OpenTelemetry or tracing is — with dense tables and a non-obvious module-versioning gotcha. However, 'The trap' paragraph restates the versioning point twice ("Hand-picking and re-guessing each @vX is the churn to avoid") and an inline dated fact ("verified 2026-10-15") could be trimmed, matching 'efficient; minor instances of over-explanation'. Not 5 because those few tokens could be cut; not 3 because there is no genuinely unnecessary explanation.

Actionability

Fully executable guidance: copy-paste `go get ...@latest` commands per module group, `gh api repos/.../releases/latest -q '.tag_name'`, a version-sorted tag command, WebFetch CHANGELOG URLs, and a concrete verification path (`go mod tidy -diff`, `go build ./...`, `go test ./...`) — covering the common cases. Not 4 because commands are complete and specific with no gaps.

Workflow Clarity

The reference-routing table, the ordered 'read before adding dependencies' → `go get` → `go mod tidy && go build ./...` procedure, and the explicit upgrade-review verification path ('always finish with a safe local verification path... never a deployment endpoint') give a clear sequence with most checkpoints. Not 5 because there is no error-recovery feedback loop (what to do when the build or verification fails); not 3 because validation checkpoints are explicit, not implicit.

Progressive Disclosure

Verified against the actual bundle: all six files in the References table exist in references/, are one level deep (only lateral cross-links between sibling reference files, e.g. breaking-changes.md → performance.md), and each row carries a clear 'Use when' condition. The body keeps overview-level content (routing, versioning gotcha, sources of truth) appropriately inline. Matches 'clear overview with well-signaled one-level-deep references; easy navigation'.

Specificity

Lists multiple specific concrete actions — "SDK setup, API surface, breaking changes, contrib instrumentation libraries (otelhttp, otelgrpc, otelmongo), compile-time zero-code instrumentation (otelc), and performance tuning" — with named packages, in third person, giving comprehensive coverage. Not 4 because coverage is broad and every action is concrete, not just 'several specific actions with minor gaps'.

Completeness

Explicitly answers both: what ("SDK setup, API surface, breaking changes, contrib instrumentation libraries..., and performance tuning") and when ("Use when adding, reviewing, or configuring OpenTelemetry in a Go service. Triggers on...") with concrete trigger phrases. Not 4 because the 'when' clause is fully explicit, not merely present.

Trigger Term Quality

Twelve explicit natural trigger phrases ("setup otel in go", "go telemetry", "go tracing", "otelhttp", "otelgrpc", "TracerProvider go", "otelc", "zero-code go instrumentation", "go build instrumentation") plus a catch-all "any Go-related OTel question" — comprehensive coverage including synonyms, package names, and API types. Not 4 because the list goes well beyond 'a few natural terms missing'.

Distinctiveness Conflict Risk

The Go scoping on nearly every trigger establishes a clear niche, but triggers like "otelconf go" and the SDK-setup capability overlap with closely related sibling OTel skills (otel-declarative-config, otel-sdk-versions) that the body cross-references — matching 'mostly distinct; minor overlap risk with closely related skills'. Not 5 because that overlap with sibling skills is real; not 3 because the Go qualifier keeps conflict risk minor rather than broad.