pub fn native(
ns: &str,
action: &str,
source: ToolSource,
annotations: ToolAnnotations,
usage: ToolUsage,
) -> ToolDescriptorExpand description
Build a native ToolDescriptor for (ns, action), pulling the description
and tier from the canonical verbs vocabulary and layering the supplied
usage guidance on top. The tier is filled from the verb hint when the
caller leaves it unset. Shared by every backend declaration and by the
composition root for the capabilities it owns directly.