Conciseness

The body is dense with repo-specific, non-obvious knowledge (per-template `action` scripts, the local-dev sign-in endpoint, `test:fast` exclusion suffixes) and avoids explaining concepts Claude already knows. Minor over-explanation remains: the "Real failures this replaces" quote block and some "Do NOT report done" framing restate rules already stated elsewhere, keeping it below anchor 5's every-token-earns-its-place bar.

Actionability

Every change area maps to a copy-paste-ready command (`pnpm --filter <app> dev`, `pnpm action <name> --key value`, `pnpm guard:<name>`, `node --experimental-strip-types --test scripts/ci-change-scope.test.ts`, `pnpm qa:deploy-paths --target node`) including edge-case workarounds like signing in via `POST /_agent-native/auth/local-dev`. The per-area table fully covers the common cases with executable commands.

Workflow Clarity

The process is unambiguous and validation is the skill's explicit subject: scale the verification, run the per-area proof, put the proof in the reply, and state the exact gap when verification is impossible. Validation checkpoints and feedback loops are explicit throughout ("A failing check is a reason to keep working"; the guard row requires testing both a case that should pass and one that should still fail; the migration row boots then reads back the new column).

Progressive Disclosure

The single file is well-organized with clear sections, the "Proof by area" table is core content that belongs inline, and there are no buried or nested references. However, at roughly 100 body lines with a very dense table and no reference files to offload per-area detail, it exceeds the under-50-line simple-skill case that would justify anchor 5, landing at anchor 4's good-structure-with-minor-gaps level.

Specificity

The description enumerates concrete proof mechanisms ("which dev server, test command, or invocation") and five change areas ("a template UI change, an action, a migration, a guard, or a core/package change"), giving several specific elements with only minor gaps (e.g., production forensics and docs-only cases are unmentioned). It exceeds anchor 3's 1-2 concrete actions but is not the comprehensive action enumeration of anchor 5.

Completeness

It explicitly answers both questions: what ("Concrete, per-area proof that a change actually works before reporting it fixed") and when ("Use before every wrap-up, and before stopping mid-task to ask permission instead of continuing") with concrete timing triggers. The explicit 'Use' clause satisfies the trigger-guidance requirement, and the when-clause is specific rather than the could-be-more-explicit level of anchor 4.

Trigger Term Quality

Natural phrases users would say appear verbatim ("fixed, done, or 'should work now'", "proof that a change actually works", "wrap-up"), giving good keyword coverage. However the most common natural trigger terms for this need — "verify", "test", "confirm", "end to end" — are absent, so it falls short of anchor 5's comprehensive synonym coverage but is clearly above anchor 3.

Distinctiveness Conflict Risk

The niche is clear and distinctive (verification-before-reporting-done, triggered at wrap-up time), but common words like "change" and "works" leave minor overlap risk with generic testing/debugging skills. It is mostly distinct per anchor 4 — not the minimal-conflict crispness of anchor 5, but well above the broad overlap of anchor 3.