Conciseness

The router body is lean and efficient with zero padding — every line does routing work ('Route the current request before inspecting files, planning, invoking a specialist, or editing code') and assumes competence, matching anchor 5; there is no over-explanation to trim for anchor 4.

Actionability

Concrete, executable guidance with real file paths (references/planner.md, references/iterate.md), explicit do/don't steps, and illustrated routing cases (starter/demo files, coherent scene/source/UI implementation), but route selection ultimately relies on judgment with no default fallback when a request is ambiguous — anchor 4 rather than fully deterministic anchor 5.

Workflow Clarity

The 'Internal handoff' gives a clear numbered sequence with an explicit commitment checkpoint ('State the selected route in one sentence') and prohibitions on interleaving actions, matching anchor 4's 'clear sequence with most checkpoints present' rather than anchor 5, which expects feedback loops/error recovery that a router lacks.

Progressive Disclosure

The entry point is a lean overview with well-signaled, verified one-level-deep references to exactly one of two playbooks, but the third bundle file references/api-reference.md is not referenced from SKILL.md or either playbook — a minor organization gap that fits anchor 4 rather than anchor 5's fully navigable structure.

Specificity

Names the domain (IWSDK development) and exactly two concrete actions — 'Routes fresh builds to an internal planning playbook and bounded changes to an established app to an internal iteration playbook' — which matches the anchor for 1-2 concrete actions without comprehensive coverage, rather than anchor 4's 'several specific actions'.

Completeness

Explicitly answers both: what ('Routes fresh builds to an internal planning playbook and bounded changes to an established app to an internal iteration playbook') and when ('Invoke first for every IWSDK implementation request'), a concrete trigger phrase matching anchor 5 rather than the weaker 'when' of anchor 4.

Trigger Term Quality

Good natural keyword coverage — 'IWSDK development', 'IWSDK implementation request', 'fresh builds', 'established app' — but common variations a user might say (new app, iterate, fix, extend, tune) are absent, so it fits anchor 4 rather than anchor 5's comprehensive synonym coverage.

Distinctiveness Conflict Risk

'Single entry point for IWSDK development' establishes a clear niche gated on the IWSDK domain with distinct triggers, minimizing conflict risk with other skills — a clear anchor 5 fit.