Conciseness

The body is a lean routing table plus terse numbered invariants and a reference appendix; it assumes Claude's competence and avoids explaining concepts Claude already knows, with every line earning its place.

Actionability

It points to concrete files and code paths (state_machine.py, scheduling.py, apply_outcome, AlertWizard) with specific rules to follow, but the body itself is routing/architecture guidance rather than copy-paste executable code, so it sits at 'mostly executable guidance with minor gaps' rather than fully runnable.

Workflow Clarity

The 'Route first' table gives a clear request-to-path-to-file sequence and the invariants act as checkpoints, but there is no explicit validate/feedback loop, which is acceptable for a routing skill yet keeps it just below the top anchor.

Progressive Disclosure

The body is a clear overview with a routing table and a reference appendix pointing one level deep to four real files in references/ (architecture.md, adopting-platform-alerting.md, extending-platform-alerting.md, frontend-alerting.md), all clearly signaled and easy to navigate.

Specificity

The description enumerates concrete platform capabilities — 'Routes lifecycle state machines, AlertPolicy, destinations, HogFunction dispatch, email, fixed-cadence and calendar scheduling, insight evaluation, the AlertWizard, and shared alert editor components' — giving comprehensive coverage of specific actions rather than vague language.

Completeness

It explicitly states what the skill is ('Recommended repo-engineering guide when adding alerting...') and when to use it ('Use for product alert implementations, shared destination types... Not for configuring alerts in an existing product'), with concrete positive and negative trigger guidance.

Trigger Term Quality

Natural phrases like 'adding alerting to a PostHog product', 'product alert implementations', and 'advanced alert settings' are present, but the coverage leans on internal jargon (AlertPolicy, HogFunction dispatch, AlertWizard) and omits some common user-facing variations, fitting the 'good keyword coverage; a few natural terms missing' anchor rather than comprehensive.

Distinctiveness Conflict Risk

The niche is sharply defined as PostHog product-alert platform engineering, and explicit out-of-scope routing ('Use authoring-log-alerts', 'Use sending-notifications') minimizes conflict with adjacent alert skills.