Conciseness

The body is dense and mostly earns its tokens: per-engine state vocabularies, tc qdisc injection commands, XR clause IDs, and a full fixture example are exactly the domain knowledge Claude lacks. Minor over-explanation remains — the motivational paragraph citing Microsoft's certification guide, the worked example re-walking all seven steps, and inline time-sensitive version pins ("Netcode for GameObjects v2.11", "XR v16.1 May 2026 release notes", "Unity 6.0") that are not placed in a deprecated/old-patterns section. This is 'efficient with minor instances that could be trimmed' (4) rather than the noticeably padded level 3 or the fully lean level 5.

Actionability

Concrete and executable in most places: a copy-paste-ready C# `[UnityTest]` host-migration fixture with real asserts, exact `tc qdisc … netem delay 200ms` / `loss 5%` / `reorder 25%` commands, named engine hooks (`OnRep_`, `NetworkVariable<T>`, `ROLE_*`, `isOwned`), and a literal gate-report format. It stops short of level 5 because the Unreal fixture path ('drive a multi-process test harness... use specs to observe OnRep_ invocations') and the Mirror path are described directionally without any executable example, leaving gaps for two of the three supported engines.

Workflow Clarity

Seven explicitly sequenced steps, each with defined inputs and outputs, a risk-weighted sampling rule, and a final go/no-go gate with hard thresholds ('high-risk bucket is at 100 %', every cert-mapped clause covered) that 'refuses to advance to platform-cert submission'. Validation and a feedback loop are demonstrated concretely: the worked example ends in a NO-GO on an XR-015 flake with the required remediation, and the anti-patterns table enumerates failure modes with fixes. This matches the level-5 anchor (clear sequence, explicit validation, error-recovery loops, checklist-style gate).

Progressive Disclosure

The body is a clear overview that pushes bulk detail one level deep into real, well-signaled bundle files: the per-engine state/authority tables live in references/engine-states.md (verified to exist and contain exactly that) and the fixture-to-XR mapping in references/cert-clauses.md (also verified, one level deep with no further nested skill references). Both references are introduced with explicit 'The full ... tables are in [references/...]' framing, and the remaining inline content (workflow, worked example, anti-patterns, limitations) is appropriately placed.

Specificity

The description lists multiple concrete actions with comprehensive scope: "Builds a coverage matrix for connect, authority handoff, disconnect, reconnect and host migration under latency, loss and reordering for Unity Netcode, Unreal and Mirror, with a go/no-go gate" — the deliverables (coverage matrix, go/no-go gate), the transition edges, the fault types, and the three engine stacks are all named explicitly. It is not merely "names the domain" (level 2-3) nor "several actions with minor gaps" (level 4); the enumerated scope is comprehensive for the niche.

Completeness

Both halves are explicit: what — "Builds a coverage matrix for connect, authority handoff, disconnect, reconnect and host migration under latency, loss and reordering... with a go/no-go gate"; when — "Use before a multiplayer game goes to platform cert, where broken multiplayer is a common rejection". This matches the level-5 anchor (clear what AND when with concrete trigger phrasing), not level 4 where the 'when' is present but could be more specific.

Trigger Term Quality

Good natural-term coverage: "multiplayer game", "platform cert", "host migration", "reconnect", "disconnect", "latency", "loss", "Unity Netcode", "Unreal", "Mirror" — phrases a game developer would actually say. Falls short of the level-5 anchor (comprehensive including synonyms) because a few natural variants are absent: the "NGO" abbreviation users type, platform names (Xbox/PlayStation/Switch), and standalone "netcode"/"certification" phrasing.

Distinctiveness Conflict Risk

Clear niche with distinct triggers: pre-cert multiplayer state-machine coverage for three named netcode stacks, which does not overlap with generic testing or cert-overview skills. Not level 4 ("minor overlap risk with closely related skills") because the multiplayer/netcode/migration trigger vocabulary is unique to this skill's purpose.