A tools bundle is given its words, composed per machine; what they name is the account's to read (hq ADR 0192)

build.artifacts[].env on a bundle: words and values written with ${dir:…} and ${port:…} only,
refused when a value carries any other reference (a secret's content, a binding) or names a word
the runtime sets for itself, and on any artifact that is not a bundle. Resolved per machine like a
container's environment and handed to the runtime as MESH_TOOL_ENV, module by module, in the unit
so a change restarts it. Every file and directory of the module a word names, or that holds one, is
owned by the account the runtime runs as where it says no owner, since a tool reads as that account.

internal/catalogue/declaration.go

@@ -921,6 +921,16 @@ func (r Resolution) compose(with Rendering, owner map[string]string,
 		}
 		owner[fmt.Sprint(process["id"])] = RuntimeModule
 		out = append(out, process)
+		// What each module's bundles are given is read as the account the runtime runs as.
+		words := map[string]map[string]string{}
+		for _, m := range r.Modules {
+			w, err := bundleWords(m, with)
+			if err != nil {
+				return nil, err
+			}
+			words[m.Module] = w
+		}
+		givenTo(out, owner, words, r.Account)
 	}
 	if with.Adopted {
 		// First, before anything a module declares: what the mesh needs reachable, then its guard.