The ~218-line body includes content Claude largely already knows — the ISTQB glossary definitions of 'severity' and 'priority', prose restating that severity is 'an objective property of the defect', and the 'Per IEEE 1044-2009' framing — which matches the score-2 anchor of mostly efficient but with some unnecessary explanation; it is not the level below because the core enumerative reference material (scales, 5x5 matrix, worked examples proving axis independence) genuinely earns its tokens, and not the level above because the glossary quotes and conceptual restatements could be trimmed.

The numbered 'How to use' steps give specific executable guidance ('pick a severity (S1-S5) from the severity scale anchors', 'Set the tracker's severity and priority fields per the configuring-a-tracker table'), and the tracker-config table supplies concrete per-platform field names (Jira Severity/Priority, GitHub labels 'severity:critical', Azure DevOps 1-4), matching the score-3 anchor for concrete copy-paste-ready guidance; per scoring_notes, absent code in an instruction-only skill is not penalized when guidance is this actionable.

The 7-step 'How to use' sequence has explicit validation checkpoints — step 3 ('if the cell is rare or unusual, record an explicit rationale') and step 4 ('Confirm you did not collapse the axes') — and the worked example reinforces the matrix-check loop, matching the score-3 anchor for a clear sequence with explicit validation steps; it is not the level below because the checkpoints are explicit, not merely implied.

No bundle files exist in references/, scripts/, or assets/, and the body is organized into clear single-level sections (Overview, When to use, How to use, the two axes, Why separate, Worked example, Mapping to lifecycle, Common confusions, Configuring a tracker, Anti-patterns, Limitations, References) with one-level-deep pointers to sibling skills, matching the score-3 anchor for a well-organized single-file reference skill; it is not the level below because the content is appropriately sectioned rather than a monolithic wall or nested-reference chain.

Lists multiple concrete actions — 'Enumerates the canonical 5-point severity scale', 'maps to IEEE 1044-2009 severity classes', 'ties to bug-lifecycle-reference state transitions' — matching the score-3 anchor for multiple specific concrete actions; it is not the level below because it goes beyond naming a domain to enumerating specific capabilities.

Explicitly answers both 'what' (distinguishing severity from priority, enumerating both scales, mapping to IEEE 1044, tying to lifecycle) and 'when' (the 'Use when...' clause with three explicit triggers), matching the score-3 anchor; it is not the level below because the when-guidance is explicit, not merely implied.

'Use when triaging a defect, configuring a tracker's severity/priority fields, or reviewing whether a bug report assigned them consistently' gives natural trigger phrasings a triager or PM would actually say, matching the score-3 anchor for good coverage of natural terms; it is not the level below because the triggers are concrete and varied rather than a single generic keyword.

The niche — separating defect severity from priority as two independent axes with per-tracker field configuration — is sharply scoped with distinct triggers, making it unlikely to fire for the wrong skill; it is not the level below because the domain and triggers are specific rather than overlapping with generic skills.