The body is lean and assumes Claude's competence — no pedagogy about what an LLM or model tier is, organized as tables and numbered steps. It is leaner than the score-2 anchor example (which editorializes "It's a good library that handles most formats well"); a slight redundancy where the "Key principle" paragraph restates the Layer 0 table row keeps it just inside 3 rather than flagging it at 2.

Provides fully concrete, copy-paste-ready guidance: exact config field names (defaultModel, agentModelOverrides.{name}), a full JSON schema, exact trigger phrases, and exact acknowledgment templates. This is instruction-only (no executable code) which the rubric permits when guidance is actionable; not 2 because no key details are vague or missing.

Multi-step processes are clearly sequenced (On Session Start, On Every Agent Spawn, When User Sets, When User Clears) with an explicit VALIDATE checkpoint ("VALIDATE the model ID against the catalog") before the destructive config write, plus a STOP checklist. Matches score 3 ("Clear sequence with explicit validation steps… checklists"); not 2 because validation and checkpoints are explicit, not 1 because the sequence is unambiguous.

No references/, scripts/, or assets/ bundle directories exist and the body has no markdown links to external files, so there is no nested reference chain to penalize. The single self-contained document is cleanly sectioned (SCOPE, Context, Hierarchy, AGENT WORKFLOW, Config Schema, Fallback Chains); per the simple-skills scoring note, well-organized sections without need for external refs score 3. Not 2 because organization is strong and nothing is poorly signaled.

Quotes "Determines which LLM model to use for each agent spawn" — names a concrete action over a defined domain, but it is a single action rather than multiple specific ones. Matches the score-2 anchor "Names domain and some actions, but not comprehensive"; not 3 because no list of actions, not 1 because a real action is named.

States what the skill does ("Determines which LLM model to use for each agent spawn") but has no "Use when…" clause or equivalent explicit trigger. Per the judging guideline, a missing "Use when…" clause caps completeness at 2; not 1 because the what is clearly present, not 3 because the when is absent.

No natural user-facing trigger phrasings (e.g. "pick a model", "switch to opus", "use a different model"); "agent spawn" is internal jargon users would not say. Matches score 2 ("Some relevant keywords but missing common variations") because "model" is relevant; not 3 due to lack of natural variations, not 1 because relevant keywords are present.

The model-selection niche is reasonably distinct (orchestration concern) but the description offers no distinct trigger phrasing to lock it away from adjacent skills. Matches score 2 ("Somewhat specific but could still overlap"); not 3 because no distinct triggers, not 1 because it is not generic.