Conciseness

The body is dense and assumes competence — no explaining what Playwright or OAuth is, just exact commands and project-specific facts. Minor over-explanation remains: the ~17-item enumeration of fields `safeAuthCallbackReport` recognizes ("access_token, refresh_token, provider_token…") duplicates logic the helper already encapsulates, and the incident backstory paragraph could be a one-line link. Fits anchor 4 (efficient with minor trimmable instances); not 5 because those passages don't each earn their tokens, not 3 because there is no genuinely unnecessary concept explanation.

Actionability

Fully executable guidance throughout: exact commands ("pnpm --dir apps/frontend exec playwright install", "E2E_BASE_URL=https://alethical.com just e2e"), exact hosts and URLs, a concrete model choice ("model sonnet"), an enumerated brief contents list, a specified report format, and a precise import path for safeAuthCallbackReport. For an instruction-only skill this is copy-paste-ready guidance covering the common cases, matching anchor 5.

Workflow Clarity

"When to run which" gives explicit decision points, the agent-driven test is a clear spawn → brief → run → report sequence, and the sign-in safety section supplies explicit stop-condition checkpoints ("Stop before selecting an account when neither fact can be proved") with per-story verdicts (passed / failed / passed-with-friction). Falls short of anchor 5 only in feedback loops: there is no stated path for what to do after a failed verdict (e.g., re-run after fix or file an issue), leaving a minor validation gap at anchor 4.

Progressive Disclosure

Well-sectioned body with clearly signaled one-level-deep references ([stories.md], docs/philosophy.md, reader-completion-checks.md, the GitHub issue) and no nested reference chains. The bulk story content is correctly split out to stories.md, but the long inline sign-in safety section and inline field-name list are content that anchor 5 would place in a separate reference, so anchor 4 (good structure, minor organization gaps) is the best fit.

Specificity

Lists multiple concrete actions covering the skill's full scope: "Run an end-to-end browser test", "Spawns a FRESH-context agent on a cheap model", "drives the running app through a browser in scripted user stories or free exploration", "reports what breaks", plus owning Playwright checks and story-to-spec graduation. This matches the comprehensive-coverage anchor; the level-below anchor (minor gaps in coverage) doesn't fit since every capability of the skill is named.

Completeness

Explicitly answers both questions: what ("Spawns a FRESH-context agent… drives the running app… reports what breaks. Also owns the on-demand Playwright checks") and when ("after a feature lands, on demand ('browser-test this', 'drive the app', 'test it like a user'), or before calling frontend work done") with concrete trigger phrases — a direct match for the anchor-5 pattern. Not 4, because the 'when' is already explicit and specific rather than needing more detail.

Trigger Term Quality

Includes quoted natural trigger phrases users would actually say — "browser-test this", "drive the app", "test it like a user" — plus "end-to-end", "Playwright", and "just e2e". Good keyword coverage, but a few natural variations (e.g., "click around", "smoke test", "try the frontend") are missing, so it fits anchor 4 rather than the comprehensive-synonyms anchor 5; it is clearly above anchor 3 because multiple common variations are present.

Distinctiveness Conflict Risk

Clear niche: product-specific ("browser test of Alethical"), with distinctive quoted triggers ("browser-test this", "drive the app") that no generic testing skill would claim. Minimal conflict risk; anchor 4's "minor overlap risk" would require ambiguity with closely related skills, which the product naming and fresh-context framing avoid.