Conciseness

The body is ~28 lean lines with zero explanation of concepts Claude already knows: it assumes competence and every instruction carries new, non-derivable information (paths, tool availability, output rules, margins), matching the lean-and-efficient anchor.

Actionability

Guidance is highly concrete for an instruction-only skill — exact paths ('/mnt/session/uploads/app.log', '/workspace/findings/*.json', '/mnt/session/outputs/postmortem.pdf') and a specific API ('matplotlib.backends.backend_pdf.PdfPages') — but there is no runnable snippet and one soft, non-concrete pointer ('Follow any postmortem conventions you find in team memory'), leaving minor gaps versus fully executable guidance.

Workflow Clarity

A clear sequence is present (start from findings, write one script, run it, 'fix it only if it errors', then report the file name) with a minimal error-recovery loop, but there is no explicit checkpoint on the output itself (the skill even says not to inspect the rendered PDF), matching the anchor for clear sequence with minor validation gaps rather than the 5-anchor's explicit validation steps.

Progressive Disclosure

The skill is under 50 lines, needs no external references (none exist in the bundle), and is organized into two well-signaled sections ('What it must contain', 'How to build it'), so per the simple-skill guideline it fully meets the well-organized-sections bar.

Specificity

The description names a specific domain (SRE postmortems) and one concrete action — "writes a postmortem PDF" — but lists no subordinate capabilities (timelines, charts, action items), matching the anchor for domain plus 1-2 concrete actions rather than the several specific actions required for a 4.

Completeness

Both what ("How the SRE team writes a postmortem PDF") and when ("Use this whenever asked for...") are explicitly present, and the when is concrete; however the what is a single thin clause rather than a concrete capability list, so it sits between the 4 and 5 anchors rather than clearly matching 5's comprehensive what-plus-trigger example.

Trigger Term Quality

"postmortem, an incident report, a write-up to share, or a PDF of what happened" gives good natural keyword coverage, but common variations users might say are missing ("post-mortem", "retrospective", "RCA", "incident review"), matching the anchor for good coverage with a few natural terms missing.

Distinctiveness Conflict Risk

"How the SRE team writes a postmortem PDF" with triggers like "postmortem" and "incident report" carves out a clear niche; the "PDF of what happened" phrasing is qualified so overlap with generic PDF-creation skills is minimal, matching the clear-niche anchor.