Conciseness

Phrases like 'On `failed`, print the handoff Markdown as returned and stop. Preserve the retry `/validate {plan-path}` instruction' and 'Do not run final validation when implementation tasks remain' in the Rules section largely restate the Workflow section's branch handling, and meta-commentary such as 'That property is load-bearing, so reach it through the reference rather than acting from this summary' could be trimmed. The body is otherwise efficient, matching 'mostly efficient but includes some unnecessary explanation or could be tightened' rather than the verbosity of a 2.

Actionability

Guidance is concrete and directive: 'Read `references/validation.md`, then run the **Validation phase**', an explicit input contract for `$ARGUMENTS` with defined empty-argument behavior, a concrete branch table ('`blocked` -> Return the blocked Markdown report unchanged. Stop.'), and a named layout to render ('Render the **Completion** layout from `references/output.md`'). It falls short of 5 because the actual executable detail is delegated to reference files rather than given inline, leaving minor gaps.

Workflow Clarity

A strictly ordered two-step workflow with explicit validation checkpoints: step 1 branches on the report's 'Status:' with defined outcomes (blocked/failed/validated), explicit 'Stop.' markers, and a preserved feedback loop for error recovery ('Preserve the retry `/validate {plan-path}` instruction'). The sequence, gates, and stop conditions are all explicit, matching the top anchor.

Progressive Disclosure

SKILL.md is a lean control-flow overview (~95 lines) that holds only dispatch logic, while all phase detail lives in three one-level-deep reference files that all exist (`references/validation.md`, `references/validation-report.md`, `references/output.md`), each signposted with read timing ('Read the reference before taking any action for step 1, not after'; 'Step 1 points to it at the moment it is needed'). This matches 'clear overview with well-signaled one-level-deep references; content appropriately split'.

Specificity

The description names the domain ('SCE plan') and two concrete actions ('Validate one completed SCE plan', 'record final validation evidence'), matching the anchor 'Names domain and 1-2 concrete actions, but not comprehensive'. It is not a 4 because two actions do not constitute 'several specific actions', and the actions themselves are stated at a high level.

Completeness

The 'what' is clear (validate a completed SCE plan, record final validation evidence) but there is no 'when' — no 'Use when...' clause or equivalent explicit trigger guidance, which caps completeness at 3 per the judging guidelines. It is not a 2 because the 'what' is specific, not vague.

Trigger Term Quality

Relevant keywords are present ('Validate', 'SCE plan', 'validation evidence'), and a user would plausibly say 'validate this plan'. However, common variations and synonyms are missing (e.g., 'check', 'verify', 'final review', 'plan validation'), matching 'Some relevant keywords but missing common variations or synonyms' rather than the good coverage of a 4.

Distinctiveness Conflict Risk

'SCE plan validation' carves out a clear niche within the SCE workflow system, so it is 'mostly distinct; minor overlap risk' with closely related SCE skills (e.g., other SCE validation or completion skills). It falls short of 5 because the description provides no distinct trigger phrases, leaving some risk of overlap with generic validation requests.