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/mcp.go

@@ -125,7 +125,15 @@ func (s *Surface) Handle(r Request) *Reply {
 			return refuse(r.ID, -32603, "the mesh's discovery failed: "+err.Error())
 		}
 		tools := make([]map[string]any, 0, len(l.Tools))
-		for _, t := range l.Tools {
+		inputs := map[string]map[string]json.RawMessage{} // module → tool → input, asked once per module
+		for i, t := range l.Tools {
+			if !t.Seat && len(t.Input) == 0 {
+				if inputs[t.Module] == nil {
+					inputs[t.Module] = toolInputs(s.conn, t.Module)
+				}
+				l.Tools[i].Input = inputs[t.Module][t.Name]
+				t = l.Tools[i]
+			}
 			var schema map[string]any
 			switch {
 			case t.Seat && t.Scope != "node":
@@ -295,3 +303,24 @@ func (s *Surface) instructions() string {
 		"arguments; mesh_call calls it. " + grammar + " What may be called was fixed when this account " +
 		"was issued, so a refusal means the account, not the tool."
 }
+
+// toolInputs is every tool's input schema of one module, asked of a runtime that serves it.
+func toolInputs(conn *bus.Conn, module string) map[string]json.RawMessage {
+	out := map[string]json.RawMessage{}
+	got, err := conn.Ask(module+".tools", map[string]any{}, "")
+	if err != nil {
+		return out
+	}
+	var answer struct {
+		Tools []struct {
+			Name  string          `json:"name"`
+			Input json.RawMessage `json:"input"`
+		} `json:"tools"`
+	}
+	if json.Unmarshal(got.Result, &answer) == nil {
+		for _, t := range answer.Tools {
+			out[t.Name] = t.Input
+		}
+	}
+	return out
+}