Content
86%Weight 40%Scale 1-5Reviews the quality of instructions and guidance provided to agents. Good implementation is clear, handles edge cases, and produces reliable results.
A well-engineered instruction-only skill body: dense with non-obvious domain judgment, a genuine safety boundary around live store mutation, explicit verification requirements, and clean conditional disclosure into three substantive reference files. The two gaps are the absence of any concrete package/API handles or worked examples, and a workflow that is conveyed by section ordering rather than an explicit step sequence with a retry loop.
Suggestions
Actionability: name the concrete store packages and API surfaces to reach for (e.g., the in_app_purchase plugin's purchase-status stream and restore method) or include one short purchase-update handler skeleton, so the directives are executable against a real API rather than purely descriptive.
Workflow clarity: state the Preflight → implement → verify sequence explicitly as numbered steps with a validation gate (e.g., 'only change store configuration after the identifier/signing inspection passes'), and spell out a validate → fix → re-run loop for failed verification cases.
Workflow clarity: tie the interrupted-purchase and restore/reconciliation cases to where their evidence should appear (test output, backend logs, sandbox history) so the pass/fail checkpoints are observable rather than enumerated.
| Dimension | Reasoning | Score |
|---|---|---|
Conciseness | The 48-line body never explains concepts Claude already knows (no 'what is Flutter/billing' padding) and every sentence carries skill-specific judgment such as 'Never grant an entitlement from a button tap, client assertion, unverified payload, or pending transaction' and 'Process verified completed transactions idempotently, then perform the store-required acknowledgement, consumption, or finish step exactly as the product type requires'. Lean and dense with directives; nothing to trim without losing guidance. | 5 / 5 |
Actionability | Concrete, specific instruction throughout — a preflight checklist ('Read `pubspec.yaml`, SDK constraints... product identifiers, purchase listener ownership, entitlement source of truth'), an eleven-item test coverage list, and required test-case structure ('preconditions, actions and interruption point, expected store and entitlement states... observable pass/fail evidence'). It falls short of anchor 5 only because no store package names, API entry points, or worked handler examples are given, so guidance is directive rather than copy-paste executable. | 4 / 5 |
Workflow Clarity | A clear Preflight → conceptual model → references → Boundaries → Verification arc with real checkpoints: a safety gate before touching store configuration ('Do not create products, change pricing, upload builds... without explicit authorization'), mandatory pre-change inspections ('do not stop at a scenario checklist... inspection of application and bundle identifiers, flavors and environments, Android and Apple signing'), and required evidence ('State which store, product type, account mode, platform, and backend path were exercised'). Not anchor 5 because the sequence is implied by section order rather than stated as steps, and no explicit validate → fix → retry loop is spelled out. | 4 / 5 |
Progressive Disclosure | The body is a lean overview that splits depth across three real, one-level-deep reference files (verified to exist with no nested references), each clearly signaled with its trigger topics: 'Read [purchase lifecycle and entitlements] for listener ownership, verification, idempotency...' etc. Conditional loading guidance plus a short Sources section makes navigation easy — the anchor-5 structure. | 5 / 5 |
Total | 18 / 20 Passed |