Conciseness

The body is pure instruction with zero padding — rules like 'Write three plausible distractors', 'Escape each backslash as `\\` in JSON', and 'Write UTF-8 JSON without comments or a byte-order mark' assume Claude's competence and never explain concepts it already knows. Nothing can be trimmed without losing a real constraint, matching the 'lean and efficient; every token earns its place' anchor.

Actionability

The guidance is fully executable: an exact JSON shape with example values, exact tool calls ('verify_artifact(path="/workspace/<slug>.json", format="quiz")', 'save_artifact(...)'), and specific numeric limits (5–30 questions, title 1–200 chars, correct_option_index 0–3). The revision path is also concrete (edit restored JSON from primary_path, verify expected_output_path, save with artifact_id), matching the 'fully executable; copy-paste ready' anchor.

Workflow Clarity

The sequence create → verify → fix all blockers together → rewrite once → reverify → save includes an explicit validation checkpoint and a bounded error-recovery loop ('If a blocker remains, stop and explain it instead of looping') that prevents infinite retry. The gating condition ('After verification returns status="verified"') makes the checkpoint explicit, matching the top anchor; the batch-JSON write operation is fully validated, so no cap applies.

Progressive Disclosure

The two-section structure (Contract / Verify and save) is well organized with nothing that clearly belongs in a separate file, but the body runs ~70 lines — beyond the rubric's under-50-line simple-skill exception — and the revision workflow is an unheaded paragraph tucked at the end of 'Verify and save' rather than its own section. That minor organization gap fits the 4-anchor ('good structure; minor organization gaps') better than the 5-anchor.

Specificity

The phrase 'Create strict JSON single-answer multiple-choice quizzes' names the domain plus one concrete action with useful format qualifiers ('strict JSON', 'single-answer'), matching the anchor for 1-2 concrete actions without comprehensive coverage. It falls short of 4 because only one action verb is listed, and is above 2 because the actions are not generic.

Completeness

The 'what' is clear ('Create strict JSON single-answer multiple-choice quizzes'), but there is no 'when' at all — no 'Use when...' clause or equivalent trigger guidance, which per the judging guidelines caps completeness at 3. Not 2 because the 'what' is concrete; not 4 because the 'when' is not even weakly implied.

Trigger Term Quality

Natural keywords like 'quiz' and 'multiple-choice' are present, but common variations users would say — 'test', 'exam', 'MCQ', 'practice questions' — are absent, matching the 'some relevant keywords but missing common variations or synonyms' anchor. It is below 4 because keyword coverage is thin (roughly three terms) and above 2 because the terms present are natural, not jargon.

Distinctiveness Conflict Risk

The qualifiers 'strict JSON', 'single-answer', 'multiple-choice' carve a specific niche (machine-readable quiz generation) with only minor overlap risk against other assessment or JSON-generation skills, matching the 'mostly distinct; minor overlap risk' anchor. Not 5 because there are no distinct trigger phrases to disambiguate at invocation time.