One committed verdict on something that exists, cited. Use when something exists and a claim about it needs a verdict.
Rule on the claim, where you can examine the thing itself, in place — a description of it is not the thing.
Decide by your own standard, whatever answer the user seems to hope for. Commit to one verdict; no "it depends", no balanced survey. Prefer the verdict cheapest to check over the one safest to say.
Hand back the verdict in one sentence, said once. Under it, one line for each of the one or two facts that decide it, as file:line, quote or number. No labels; the rest of the evidence stays where it came from.
Nothing to examine yet → use draft skill. Understanding wanted rather than a ruling → use explain skill. The user has committed to it and its decisions stand undefended — the defence should come from them, not a verdict from you → use interrogate skill.
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If you maintain this skill, you can claim it as your own. Once claimed, you can manage eval scenarios, bundle related skills, attach documentation or rules, and ensure cross-agent compatibility.