Conciseness

The body is lean and imperative — 'Read the diff and consider the observability of each function that was added or changed' — with zero padding and no explanations of concepts Claude already knows, matching 'Lean and efficient; every token earns its place'. It is not 4 because there is no over-explanation anywhere to trim.

Actionability

Concrete, specific instruction guidance is given — 'Mark a finding as critical when the gap affects a production code path, and minor when it does not' plus an enumerated scope (Logging, Metrics, Tracing) — matching 'Mostly executable guidance... with minor gaps'. Per the rubric's code-vs-instruction note, the absence of code is not penalized; it is not 5 because there are no example findings or an output format that would make the reporting copy-paste ready.

Workflow Clarity

This is a simple, single-task read-only review skill and the single action is unambiguous: a sequenced Method ('Read the diff and consider the observability of each function'), a Threshold defining when to report, and Reporting with explicit critical/minor criteria. The destructive/batch validation cap does not apply since the skill only reads a diff and produces findings.

Progressive Disclosure

The body is under 50 lines, needs no external references, and is organized into clearly labeled Scope, Method, Threshold, and Reporting sections, matching the rubric's simple-skill exception where well-organized sections alone earn a 5. No bundle files exist to reference, and none are needed at this size.

Specificity

'Review a change for observability' names the domain and one concrete action, matching the anchor 'Names domain and 1-2 concrete actions, but not comprehensive'. It is not 4 because only one action (review) is listed rather than several specific actions (e.g., assessing logging, metrics, and tracing), and not 2 because the action is a specific, targeted review task rather than minimal or generic.

Completeness

It answers both parts: what ('Review a change for observability') and when ('Use as one lens in a code review run'), an explicit use clause matching 'Has both what and when; when could be more explicit or specific'. It is not 5 because the when lacks concrete trigger phrases a user would naturally say, and not 3 because the when is explicitly stated rather than missing or merely implied.

Trigger Term Quality

Relevant keywords are present ('observability', 'review', 'change', 'code review'), but common natural variations and synonyms users would say — 'logging', 'metrics', 'tracing', 'telemetry' — are missing, matching 'Some relevant keywords but missing common variations or synonyms'. It is not 4 because several natural terms the body's own Scope section lists are absent from the description.

Distinctiveness Conflict Risk

'Observability' carves a mostly distinct niche with minor overlap risk against closely related skills, matching 'Mostly distinct; minor overlap risk with closely related skills'. It is not 5 because the broad 'review a change' phrasing overlaps with general code-review skills, and not 3 because the observability anchor is specific enough to distinguish it from sibling review lenses.