Conciseness

The body is mostly efficient but padded in places: the blame/blameless table, anti-patterns table, and Do's/Don'ts largely restate postmortem practice Claude already knows, and Template 2's 5-Whys worked example duplicates the same payment/DB-connection incident fully worked in references/details.md. Not 4 because the duplication and generic-advice sections are noticeable, not minor.

Actionability

Guidance is copy-paste ready: Template 2 is a fully worked 5-Whys analysis with per-step evidence, Template 3 is a complete quick-postmortem format, and the facilitation guide gives a time-boxed 60-minute meeting structure — covering the common major and minor cases.

Workflow Clarity

The Day 0–7 timeline and the sequenced meeting structure give a clear process order, and follow-up verification appears in the Don'ts. Not 5 because there are no explicit checkpoints or feedback loops between draft, review, and finalize stages; not 3 because the sequence itself is well defined.

Progressive Disclosure

The reference to references/details.md is clearly signaled and one level deep, but two full templates (~90 lines) that belong in that reference are inlined anyway, and the numbering is incoherent — the body shows Templates 2 and 3 while Template 1 exists only in the reference file. This matches the 'content that should be separate is inline' anchor; not 4 because the inline duplication is substantial rather than a minor gap.

Specificity

Names the domain and several concrete actions ("root cause analysis, timelines, and action items"), matching the 'several specific actions; minor gaps' anchor. Not 5 because facilitating postmortem meetings — a substantial portion of the skill — is not mentioned in the description.

Completeness

Explicitly answers both questions in third person: what ("Write effective blameless postmortems with root cause analysis, timelines, and action items") and when ("Use when conducting incident reviews, writing postmortem documents, or improving incident response processes") — a clear match for the 5 anchor.

Trigger Term Quality

"conducting incident reviews", "writing postmortem documents", "improving incident response" are natural user phrases with good coverage, matching the 4 anchor. Not 5 because common variations like "retrospective", "post-mortem", or bare "incident" are missing.

Distinctiveness Conflict Risk

The postmortem/incident-review niche is mostly distinct with specific triggers. Not 5 because "improving incident response processes" is broad enough to overlap with incident-response or runbook skills.