Conciseness

The body is lean: a one-line framing ("The #1 bug category in VS Code"), one rule per step, minimal BAD/GOOD snippets, and no explanation of concepts Claude already knows. Every token earns its place, matching the anchor-5 example's density.

Actionability

Each step gives copy-paste-ready TypeScript showing both the anti-pattern and the fix, with exact APIs (addDisposableListener, Event.once, MutableDisposable, store.add(model.onWillDispose(...))), a decision table, and concrete commands including `npm run perf:chat-leak --messages 20 --verbose`. Not below 5 because the examples cover all the common cases the description claims.

Workflow Clarity

"Work through each check in order" gives an explicit six-step sequence, and the Verification section provides feedback checkpoints (listener counts before/after, ensureNoDisposablesAreLeakedInTestSuite, object-count stabilization, a 2 MB/msg leak slope threshold). This matches the anchor-5 pattern of sequence plus explicit validation steps.

Progressive Disclosure

Sections are clearly organized (When to Use, six audit steps, Quick Reference table, Verification) and the only external pointer (the `chat-perf` skill) is explicitly signaled with usage flags. It falls short of a 5 because at ~148 lines the skill is fully monolithic with no split of any material into reference files, and the under-50-line simple-skill exception does not apply.

Specificity

"Audit code for memory leaks and disposable issues" is a concrete action, and the API list ("addDisposableListener, Event.once, MutableDisposable, DisposableStore, and onWillDispose") names several specific capabilities. Not a 5 because it centers on a single audit verb rather than multiple distinct concrete actions.

Completeness

Both questions are explicitly answered: the what ("Audit code for memory leaks and disposable issues. Covers ... patterns") and the when ("Use when reviewing event listeners, DOM handlers, lifecycle callbacks, or fixing leak reports") with concrete trigger phrases, matching the anchor-5 example structure. Not below 5 because neither half is vague or implied.

Trigger Term Quality

"Use when reviewing event listeners, DOM handlers, lifecycle callbacks, or fixing leak reports" plus "memory leaks" gives good natural keyword coverage a user would actually say. A few common variants (e.g., "listener leak", "dispose", "cleanup") are missing, so it falls short of the comprehensive-synonyms anchor.

Distinctiveness Conflict Risk

The VS Code-specific disposable APIs (MutableDisposable, DisposableStore, addDisposableListener) carve out a clear niche with distinct triggers and minimal overlap risk against generic performance or code-review skills. It is not a 4 because the trigger set (event listeners, DOM handlers, lifecycle callbacks, leak reports) is specific enough that confusion with a related skill is unlikely.