Conciseness

The body is efficient: terse tables, one-line mitigation patterns, and no explanation of concepts Claude already knows. However, the 10-step "Workflow" section recaps the 5 phases in detail, and "Premature 'all clear.'" in Failure patterns duplicates "Premature resolution announcements before verification" in Non-decisions to avoid — minor trimmable redundancy that keeps it below the 5 anchor's "every token earns its place".

Actionability

Highly concrete for an instruction-only skill: a per-severity response table, explicit cadences ("every 15 minutes minimum"), quoted copy-paste status page messages ("We are investigating reports of [issue]. Updates to follow."), a full output-format markdown template, and specific investigate targets ("The four most common causes: a recent deploy, a configuration change, a third-party dependency change, a load spike"). Matches the 5 anchor's copy-paste-ready coverage of common cases.

Workflow Clarity

The 10-step workflow ("1. Acknowledge ... 10. Schedule AAR") is explicitly sequenced with validation checkpoints ("7. Verify mitigation. Don't trust dashboards alone; test the user flow"), a resolution-criteria checklist, and feedback loops ("Severity can change. Re-evaluate as more info emerges"). Matches the 5 anchor; this is not a destructive/batch skill so the validation cap does not apply.

Progressive Disclosure

The single reference (references/incident-playbook.md) is real, one level deep, and clearly signaled in a dedicated "Reference files" section with a content description. However, the body inlines a severity table, roles table, and status page message templates that the reference file reproduces in expanded form, so the split duplicates content — fits the 4 anchor (good structure, minor organization gaps) better than 5's "content appropriately split".

Specificity

"Manage active production incidents through detection, triage, mitigation, communication, and resolution with structured roles and decision-making" lists the complete incident lifecycle as concrete actions. Matches the 5 anchor (multiple specific concrete actions, comprehensive coverage); not 4, since no significant lifecycle phase is missing.

Completeness

The what is explicit and concrete ("Manage active production incidents through detection, triage, mitigation, communication, and resolution") and the when is explicit with concrete trigger phrases ("Use this skill whenever the user has an active incident, a production issue, a service outage..."). Clearly matches the 5 anchor.

Trigger Term Quality

"incident response, production incident, outage, service down, site down, P0, P1, severity, downtime, on-call, incident commander, status page" covers natural synonyms (outage / service down / site down) and shorthand users actually say (P0, P1, on-call). Comprehensive for this domain; no common variation is missing.

Distinctiveness Conflict Risk

Clear niche (active production incidents) with distinct triggers like "incident commander", "status page", and "site down", but the "postmortem prep" trigger overlaps the after-action-report skill that this skill's own body routes to for post-incident analysis. Fits the 4 anchor (mostly distinct, minor overlap risk with closely related skills) better than 5.