Keep a machine's discovery answer under the bus's message limit

Every tool's schema in one $SRV.INFO reply outgrew max_payload on machines
serving 137-206 tools, and the refused reply was dropped silently, so search
and a machine's view went empty. Module tools now announce without schema;
describe and tools/list ask the module for it. An answer still too large has
its descriptions cut to a line, and a failed reply is logged.

node-tools/internal/console/address_test.go

@@ -178,11 +178,20 @@ func TestTheMeshsToolsAreFoundByAddress(t *testing.T) {
 		}
 	}
 
+	// Discovery itself asked nothing but the bus.
+	if n := asked.Load(); n != 0 {
+		t.Errorf("discovery asked a roster or a module's tools %d time(s); it asks the bus", n)
+	}
+
 	// Described without `node`: the address carries the machine.
 	described, isErr := call(t, endpoint, "mesh_describe", map[string]any{"address": "desk/beta.three"})
 	if isErr || strings.Contains(described, `"node"`) || !strings.Contains(described, `"address": "desk/beta.three"`) {
 		t.Errorf("describe: %s", described)
 	}
+	// Its schema, which discovery no longer carries for a module's tool, asked of the runtime serving it.
+	if !strings.Contains(described, `"verbose"`) {
+		t.Errorf("describe lost the tool's arguments: %s", described)
+	}
 
 	// Search finds across the layers; a module that starts serving after the first answer is found.
 	if got, _ := call(t, endpoint, "mesh_search", map[string]any{"query": "shelf"}); !strings.Contains(got, "desk/node-shelf.list") {
@@ -212,8 +221,10 @@ func TestTheMeshsToolsAreFoundByAddress(t *testing.T) {
 		t.Errorf("a module that arrived later was not found: %s", found)
 	}
 
-	if n := asked.Load(); n != 0 {
-		t.Errorf("discovery asked a roster or a module's tools %d time(s); it asks the bus", n)
+	// Only describing a module's tool asks its runtime — once, for the schema discovery no longer carries
+	// (2026-10-04: every tool's schema made a machine's discovery answer outgrow the bus).
+	if n := asked.Load(); n != 1 {
+		t.Errorf("asked a module's tools %d time(s); describing one tool asks once, and discovery never", n)
 	}
 
 	// The old names still answer, unannounced.