Conciseness

The body is dense, table-driven, and free of tutorial padding — it assumes Claude's competence throughout. Minor trimming is possible: the in-body regulatory summary table and the repeated "Operational rule" duplicate content already in references/regulatory-deadlines.md, and the 'Distinction from Other Security Skills' table overlaps the Cross-References table. That puts it just below the every-token-earns-its-place level-5 anchor but above level 3.

Actionability

All guidance is executable: copy-paste CLI invocations with flags (--classify, --false-positive-check, --severity sev1, --json), a concrete input JSON schema, an exit-code-to-required-response table, jq extraction of forensic fields, and working stdin/for-loop examples. This matches 'Fully executable; copy-paste ready code or commands; specific examples cover the common cases'.

Workflow Clarity

Workflows are explicitly sequenced with validation checkpoints: Workflow 1 checks severity and false_positive_flag before deciding, exit codes map to required responses, and the SEV1 timeline includes a human approval gate, containment-effectiveness assessment, and a tabletop exercise for verification. Destructive containment actions are gated, satisfying the cap rule and matching the level-5 anchor (explicit validation steps with feedback/re-verification).

Progressive Disclosure

Structure is good: a TOC, well-labeled sections, one clearly signaled one-level-deep reference ('Full deadline reference: references/regulatory-deadlines.md', verified to exist) and a real scripts/incident_triage.py. It stops short of level 5 because the in-body regulatory deadline table duplicates the reference file's fuller table (summary-inline is fine, but the verbatim repeated operational rule is redundant), and the ~320-line body could move some lookup tables (taxonomy, escalation matrices) into references.

Specificity

The description lists multiple concrete actions — "classification, triage, escalation path determination, and forensic evidence collection" plus "SEV1-SEV4 classification, false positive filtering, incident taxonomy" — giving comprehensive, domain-specific coverage rather than generic language. It matches the anchor 'Lists multiple specific concrete actions; comprehensive coverage' and does not fit the level-4 anchor since no meaningful capability of the skill is left unnamed.

Completeness

Both questions are explicitly answered: what the skill does ("classification, triage, escalation path determination, and forensic evidence collection") and when to use it ("Use when a security incident has been detected or declared"). The trigger phrase is concrete and unconditional, matching the level-5 anchor rather than level 4 where the 'when' would be weaker or less specific.

Trigger Term Quality

Strong natural terms a user would say: "security incident", "detected or declared", "triage", "escalation", "SEV1-SEV4", "false positive". However common synonyms such as "breach", "data breach", "compromise", or "incident response" itself are absent, so it falls between the good-coverage (4) and comprehensive-synonyms (5) anchors.

Distinctiveness Conflict Risk

The niche (active/declared incident handling with SEV levels and regulatory clocks) is clearly distinct, but triggers like "security incident ... detected" overlap somewhat with adjacent skills such as threat-detection or security-alert triage, and the description does not name its siblings to disambiguate. This fits 'Mostly distinct; minor overlap risk with closely related skills' better than the minimal-conflict level-5 anchor.