ADR 0595 §9, ADR 0597 §10, design 25 § 12.5: the request and answer types
and method names of the bundle-pipe calls the tool runner serves, apply
naming the tool call it serves (ADR 0597 §7) and answering taken, its
sequence and state behind. It imports nothing of mesh-sdk, so a change
rebuilds only its importers; the package list names it.
