Conciseness

The ~35-line body is lean with no padding and no explanations of concepts Claude already knows — statements like "The tickets are not a list of steps. They are a **task graph**" convey skill-specific protocol, and every instruction earns its place. The only near-redundancy is the twice-repeated "maximum concurrency" rationale, which is too minor to drop it to 4.

Actionability

The steps name specific mechanisms ("Each implementer subagent should work in its own worktree, on its own branch", "marked as 'closing' the spec issue", "run /code-review on the PR branch") but miss key execution details: no commands or syntax for creating the draft PR/closing issues, no merge procedure or conflict-handling guidance for the merger subagent, and no format for the "context pointers" communication. This matches "Some concrete guidance but incomplete... missing key details" rather than 4's "minor gaps".

Workflow Clarity

The 9-step sequence is clearly ordered and includes an explicit feedback loop ("If this changes the **frontier**... kick off more **implementer subagents**") and a validation checkpoint ("run /code-review... Fix all issues raised"), matching "Clear sequence with most checkpoints present; minor validation gaps". Not a 5 because there is no per-merge verification (e.g., tests passing) before merging each implementer's work into the PR branch; not a 3 because two explicit checkpoints and a feedback loop are present.

Progressive Disclosure

The skill is under 50 lines, has no bundle files (no references/, scripts/, or assets/ exist), and needs none — all content fits in the single body with well-organized intro and ## Steps sections. Per the rubric's scoring note for simple/short skills, this earns a 5.

Specificity

"Implement a specification in code" names the domain (specifications) but provides only a single generic verb with no concrete actions, matching "Names the domain but actions are minimal or generic" (cf. "Processes PDF files"). It is not a 1 because it does name a real domain and action, and not a 3 because it lists no concrete, enumerated capabilities.

Completeness

The "what" is clear ("Implement a specification in code") but there is no "Use when..." clause or equivalent trigger guidance, capping completeness at 3 per the judging guidelines. It is not a 4 because the "when" is entirely absent rather than weakly present.

Trigger Term Quality

"specification", "implement", and "code" are natural terms a user would say, but the description misses common variations like "spec", "tickets", or "spec-driven development", matching "Some relevant keywords but missing common variations or synonyms". Not a 2 since the keywords are domain-specific rather than generic; not a 4 since there is no synonym or shorthand coverage at all.

Distinctiveness Conflict Risk

The phrase "Implement a specification in code" carves out a somewhat specific niche (spec implementation) but "implement...in code" broadly overlaps general coding-implementation skills, matching "Somewhat specific but could still overlap with similar skills". Not a 4 because the description alone gives no distinguishing trigger that separates it from ordinary implementation requests.