Conciseness

The body assumes Claude's competence (no basic-concept explanations; everything is repo-specific), but statistical methodology is split across "Statistical significance" and "Statistics" sections that both explain Welch's t-test and run-count guidance, the "5+ runs" advice is repeated three times, and hard-coded version pins ("1.115.0", "1.122.0") will age. This matches anchor 3 — mostly efficient but with unnecessary duplication that could be tightened — rather than the minor-trimming level of anchor 4.

Actionability

Fully executable throughout: copy-paste quick-start commands, a complete flag table with defaults, exact `gh` CLI invocations with `--jq` filters, defined exit codes, and numeric interpretation thresholds ("0.3–1.0 MB/msg — normal", ">2.0 MB/msg — likely leak"). Commands cover all the common cases (local vs. release, two local builds, resume, CI inspection).

Workflow Clarity

Multi-step processes are clearly sequenced with explicit validation checkpoints: the four-step regression pinpointing workflow includes "Confirm it's real vs. measurement noise" with bimodal-signature guidance, statistical-significance gating acts as a validation gate before flagging, and the `--resume` flow is a genuine feedback loop for inconclusive results. Anchor 5's requirements (explicit validation, error-recovery loops) are met; the operations are non-destructive so no batch-validation cap applies.

Progressive Disclosure

Section headers are clear and quick-start content comes first, but this is a 313-line monolithic SKILL.md with no bundle files. The CI artifact-retention reference (~45 lines of tables and gh commands) and the architecture/mock-server internals are inline content that clearly belongs in separate reference files, matching anchor 3's "content that should be separate is inline" rather than anchor 4's "most content is appropriately placed".

Specificity

Names two concrete capabilities — "Run chat perf benchmarks" and "memory leak checks" — with precisely specified targets ("local dev build or any published VS Code version"). The action count matches anchor 3, but the concreteness of the targets and scope places it noticeably above that anchor, between 3 and 4.

Completeness

Explicitly answers both questions: "what" (run perf benchmarks and memory leak checks against local dev or published VS Code builds) and "when" (three concrete trigger scenarios introduced by "Use when..."). This mirrors the anchor-5 example structure; there is no gap that would justify 4.

Trigger Term Quality

Good natural-phrase coverage: "chat rendering regressions", "perf-sensitive changes to chat UI", "memory leaks in the chat response pipeline" are phrasings a user would plausibly say. A few natural synonyms (e.g. "chat is slow", "jank", "streaming performance") are missing, so it does not reach anchor 5.

Distinctiveness Conflict Risk

Clear niche — VS Code chat performance benchmarking and leak detection — with triggers distinct from adjacent concerns like heap snapshot analysis or general perf optimization. Minimal risk of triggering the wrong skill.