Conciseness

The body is largely lean and imperative — the Asana opt_fields strings, the section-structure table, and the bad/good pairs per heuristic are non-obvious project knowledge that earns its tokens, and there is no padding or generic praise. A few heuristics restate knowledge Claude already has (H1 'each interface should do one thing', H7 Flow-vs-suspend rules, H10 KDoc expectations), which is minor over-explanation matching anchor 4 ('efficient; minor instances of over-explanation that could be trimmed') rather than anchor 5's 'every token earns its place'.

Actionability

The guidance is fully concrete and executable: exact opt_fields values, the GID-extraction rule with a real example, the grep pattern ('class ClassName' / 'interface ClassName') with a path-to-module derivation example, a verbatim stop-and-ask message, a ready-to-use diagram template, and specific bad/good signatures (e.g. 'startIntent(): Intent?' vs 'startForResult(context, params, launcher)'). This matches anchor 5 — copy-paste-ready specifics covering the common cases.

Workflow Clarity

The seven-step sequence is clear and gated by explicit checkpoints: Step 2 demands confirmed module locations ('Do not proceed to the diagram or heuristics with unresolved module locations') with an error-recovery path (stop and ask the user, with the exact question), Step 1 has a comprehension checklist before reviewing, and Step 7 defines the output contract (blocking / suggestions / positives / verdict). This matches anchor 5's explicit validation steps, feedback loops, and checklists.

Progressive Disclosure

As a single-file skill with well-organized sections and no bundle files, everything is one navigation level deep and nothing is buried, matching anchor 4 ('good structure; most content is appropriately placed; minor organization gaps'). It falls short of anchor 5's clear-overview-plus-referenced-detail split only in that the 16-heuristic catalog (~90 lines) could live in a references file so SKILL.md reads as the workflow overview — though since every heuristic is needed on each run, inlining is defensible and keeps it above anchor 3.

Specificity

The domain is clearly named ("review a DuckDuckGo Android public API proposal") and a couple of concrete actions appear ("fetch the task and confirm it is an API proposal", "review, evaluate, or give feedback"), but the description never states what the review actually covers — e.g., module boundary checks, an interaction diagram, or the tiered blocking/suggestions/positives feedback. This matches anchor 3 ('names domain and 1-2 concrete actions, but not comprehensive'); it is above anchor 2 (the domain is specific, not generic) but below anchor 4 (no listing of the skill's specific capabilities).

Completeness

Both 'what' ("review a DuckDuckGo Android public API proposal" / "review, evaluate, or give feedback on a proposal") and 'when' are explicitly and concretely answered, with multiple concrete trigger phrases covering URL, inline, and file inputs. This is exactly anchor 5 ('clearly and explicitly answers both what AND when with concrete trigger phrases'); anchor 4 would require the 'when' to be less explicit, which it is not.

Trigger Term Quality

Trigger coverage is comprehensive and natural: "review my API proposal", "is this API design good?", "check my public interface", "I'm about to submit an API proposal", plus inline/file inputs and Asana URL handling, and it even includes anti-triggers ("do not invoke for impl-only changes or general Kotlin questions"). This matches anchor 5's 'comprehensive coverage of natural terms' — nothing a user would plausibly say is missing, and negative guidance goes beyond the anchor-4 example.

Distinctiveness Conflict Risk

The niche is very clear (DuckDuckGo Android *-api module proposals) and the description actively disambiguates against adjacent cases — impl-only Kotlin changes, general Kotlin questions, and non-proposal Asana URLs with confirmed signals like the "API Proposal" title and project 1212149061863360. This gives a clear niche with distinct triggers and minimal conflict risk, matching anchor 5.