Conciseness

The ~23-line body is lean with zero padding: it explains only project-specific conventions Claude could not know (e.g., why uninstall.sh must not remove shared system packages, that /back is legacy), never generic concepts. Every sentence carries non-obvious information, matching the 5 anchor.

Actionability

Guidance is concrete throughout — exact paths ("install/production-filesystem/services/scripts/check-*.sh"), named scripts with their actual behaviors ("check-first-run-config.sh exits non-zero on a critical failure", "check-ramdisk.sh exits 0 even when it detects a real issue"), and explicit rules ("must only remove NetAlertX's own files"). It stops short of the 5 anchor because the build-vs-runtime section fully defers to other skills ("See the devcontainer-configs/devcontainer-management skills") without restating the applicable rule, leaving a minor gap.

Workflow Clarity

This is a single-purpose conventions skill with no multi-step process; each section is an unambiguous rule, and the one implicit verification step is made explicit ("check what that specific script is actually guarding before suggesting a change to its exit behavior"). Under the simple-skill guideline this earns a 5; there are no destructive or batch operations requiring missing validation.

Progressive Disclosure

The body is under 50 lines, needs no external reference files (none exist in the bundle), and is organized into clearly headed sections each covering one concern. Per the guideline for short skills with no external references, well-organized sections alone merit a 5; its cross-references to sibling skills are one level deep and clearly signaled.

Specificity

The description names its domain precisely ("anything under install/ (production-filesystem/, ubuntu24/, etc.)") and lists several concrete coverage areas: "uninstall safety", "why check-*.sh scripts don't all exit the same way", and "what's legacy vs. active". It falls just short of the 5 anchor because these are topic statements rather than a comprehensive enumeration of concrete actions.

Completeness

It explicitly answers 'when' ("Read before editing anything under install/ ... or reviewing a PR that touches it") and 'what' ("Covers uninstall safety, why check-*.sh scripts don't all exit the same way, and what's legacy vs. active") with concrete trigger phrases, matching the 5 anchor exactly.

Trigger Term Quality

Natural trigger phrasing is strong — "editing anything under install/", "reviewing a PR that touches it", "uninstall", "check-*.sh", "legacy vs. active" — matching what a user would actually say. A few natural synonyms (e.g., "setup scripts", "install scripts", "uninstall script") are absent, keeping it at 4 rather than 5.

Distinctiveness Conflict Risk

It carves out a clear niche tied to specific paths and scripts (install/production-filesystem, ubuntu24, check-*.sh, /back) with minimal overlap risk against generic skills — a PR-reviewer or editor targeting install/ would unambiguously select it.