Conciseness

The body is dense with repo-specific facts Claude could not know (Consumption Matrix, hosted-billing rules, per-provider doc URLs) and wastes no tokens explaining known concepts, but there is deliberate redundancy — the Hard rules are restated across Steps 2, 4, and 6 ('Always re-grep before relying on this table', 'Cite every fact', 'never delete it to make lint pass') — a level of anchor-5 leanness it does not quite reach.

Actionability

Every instruction is copy-paste executable: exact WebFetch prompts, exact 'rg "reasoningEffort|reasoning_effort" apps/sim/providers/<provider>/' grep commands, a full TypeScript entry template with field-order and inline comments, exact 'bun run lint' / 'bun run agent-stream-docs:generate' commands, and a mandatory verification-report table format. Nothing is pseudocode or hand-waved.

Workflow Clarity

A clear 6-step sequence with explicit validation checkpoints and feedback loops: 'Lint must pass before you report done — fix the entry you wrote, never delete it to make lint pass', 'If you cannot reach an authoritative source for any field, mark the field as UNVERIFIED... ask the user before guessing', the hosted-billing assertion 'verify with getHostedModels().includes(...)', and the CI-diff check on regenerated docs. Error-recovery paths (source not found, lint failure, test breakage) are each explicitly handled.

Progressive Disclosure

Well-sectioned single-file skill with clear headings, tables, and step navigation, and no bundle files to mis-link. It sits at anchor 4 rather than 5 because ~190 lines are all inline with zero references — conditional sections like 'Reseller providers', 'Wrong family entirely?', and the full Consumption Matrix/URL table load on every invocation when they could live one level deep in reference files.

Specificity

'Add a new LLM model to apps/sim/providers/models.ts with specs verified against the provider's live API docs (no hallucination)' names the domain, one concrete action, and a concrete verification property with an exact file path — but it lists only a single action rather than the several specific actions (pricing cross-check, capability-flag consumption, hosted-billing verification) the skill actually performs, matching anchor 3 ('1-2 concrete actions, but not comprehensive') rather than anchor 4's 'several specific actions'.

Completeness

The 'what' is clear and concrete (add a model entry to a specific file, specs verified against live docs), but the 'when' is entirely absent — there is no 'Use when...' clause or equivalent trigger guidance, which per the judging guidelines caps completeness at 3.

Trigger Term Quality

'Add a new LLM model', 'provider', 'API docs', 'specs' are natural phrases a user would say when needing this skill, and 'no hallucination' captures the anti-drift intent. It stays at 4 rather than 5 because common variations a user might actually say — 'model pricing', 'new model entry', 'model catalog', 'model list', provider names — are absent.

Distinctiveness Conflict Risk

The repo-specific path 'apps/sim/providers/models.ts' plus the narrow action ('Add a new LLM model') gives it a clear niche with minimal overlap with generic documentation or coding skills — no other plausible skill would trigger on this description.