The body runs ~390 lines with fully-fleshed sample templates padded with realistic filler data ('12,000 customers', '$45,000', 'v2.3.4', 'ENG-1234', '2024-01-15') and a Core Concepts table explaining blameless culture that Claude largely already knows; the 5 Whys template also duplicates the RCA already embedded in Template 1. It is mostly efficient and actionable rather than purely abstract (so above level 1), but it is clearly not lean and could be tightened significantly (so not level 3).

It provides copy-paste-ready markdown templates, a concrete action-items table with owners/due dates/tickets, a timed facilitation agenda, and anti-pattern tables with explicit better approaches. This matches the level-3 anchor of fully concrete, executable guidance rather than the level-2 pseudocode/incomplete anchor.

The process is clearly sequenced (Day 0 → quarterly review timeline, a 60-minute meeting structure with timed segments, and a draft→review→finalize→tickets flow) with checklists (Do's/Don'ts, anti-patterns, action-item tracking). Postmortem writing is not a destructive/batch operation, so the missing-validation cap does not apply; the explicit sequencing and checklists meet the level-3 anchor.

The skill is a single monolithic SKILL.md with no bundle files and no external references, yet at ~390 lines it contains multiple large, self-contained templates (Standard, 5 Whys, Quick, Facilitation Guide) that would benefit from being split into referenced files. It is well-organized with clear headers (above level 1's monolithic wall), but content that should be separate is inline with no one-level-deep references, matching the level-2 anchor rather than the under-50-line exception for level 3.

The description lists multiple concrete actions — 'Write effective blameless postmortems with root cause analysis, timelines, and action items' — naming root cause analysis, timelines, and action items specifically. This matches the level-3 anchor (multiple specific concrete actions) rather than level 2, which only names a domain and some actions without being comprehensive.

It answers both 'what' ('Write effective blameless postmortems with root cause analysis, timelines, and action items') and 'when' ('Use when conducting incident reviews...') with an explicit trigger clause. This matches the level-3 example which pairs a capability statement with a 'Use when...' clause, and is above level 2 where the when is missing or implied.

The 'Use when' clause surfaces natural user phrasing — 'conducting incident reviews, writing postmortem documents, or improving incident response processes' — giving good coverage of terms a user would actually say. It is not at level 2 because it includes multiple common variations (incident reviews, postmortem documents, incident response) rather than a single keyword.

The postmortem / incident-response niche is clearly scoped with distinct triggers unlikely to fire for unrelated skills. It is above level 2 because the triggers (blameless postmortems, incident reviews) are specific and not the generic 'works with document files' style that overlaps broadly.