diff --git a/src/behavior3 b/src/behavior3
index 9039934..98117af 160000
--- a/src/behavior3
+++ b/src/behavior3
@@ -1 +1 @@
-Subproject commit 903993458f6a45423d60b8db864f82cd618d1bc6
+Subproject commit 98117afec4a5fe7ef4bebc8443b5439714fb7f7e
diff --git a/src/components/inspector.tsx b/src/components/inspector.tsx
index bc8b810..2d61a07 100644
--- a/src/components/inspector.tsx
+++ b/src/components/inspector.tsx
@@ -1,5 +1,15 @@
 import { EditNode, EditTree, useWorkspace } from "@/contexts/workspace-context";
-import { NodeModel, TreeGraphData } from "@/misc/b3type";
+import {
+  isBoolType,
+  isEnumType,
+  isExprType,
+  isFloatType,
+  isIntType,
+  isJsonType,
+  isStringType,
+  NodeModel,
+  TreeGraphData,
+} from "@/misc/b3type";
 import {
   checkNodeArgValue,
   checkOneof,
@@ -132,14 +142,14 @@ const NodeInspector: FC = () => {
         form.setFieldValue(
           name,
           (Array.isArray(value) ? value : []).map((item) => {
-            if (type === "json") {
+            if (isJsonType(type)) {
               return item === null ? "null" : JSON.stringify(item ?? arg.default, null, 2);
             } else {
               return item;
             }
           })
         );
-      } else if (type === "json") {
+      } else if (isJsonType(type)) {
         form.setFieldValue(
           name,
           value === null ? "null" : JSON.stringify(value ?? arg.default, null, 2)
@@ -249,7 +259,7 @@ const NodeInspector: FC = () => {
             const arr: unknown[] = [];
             if (Array.isArray(value)) {
               value.forEach((item) => {
-                if (type === "json") {
+                if (isJsonType(type)) {
                   try {
                     arr.push(item === "null" ? null : JSON.parse(item));
                   } catch {
@@ -261,7 +271,7 @@ const NodeInspector: FC = () => {
               });
             }
             data.args[arg.name] = arr;
-          } else if (type === "json") {
+          } else if (isJsonType(type)) {
             try {
               data.args[arg.name] = value === "null" ? null : JSON.parse(value);
             } catch {
@@ -546,9 +556,9 @@ const NodeInspector: FC = () => {
                                   validateTrigger={["onChange", "onBlur"]}
                                   style={{ width: "100%", marginBottom: 5 }}
                                   initialValue={
-                                    type === "boolean" ? arg.default ?? false : arg.default
+                                    isBoolType(type) ? arg.default ?? false : arg.default
                                   }
-                                  valuePropName={type === "boolean" ? "checked" : undefined}
+                                  valuePropName={isBoolType(type) ? "checked" : undefined}
                                   rules={[
                                     {
                                       required,
@@ -556,7 +566,7 @@ const NodeInspector: FC = () => {
                                     },
                                     () => ({
                                       validator(_, value) {
-                                        if (type === "json") {
+                                        if (isJsonType(type)) {
                                           try {
                                             if (value !== "null") {
                                               JSON.parse(value);
@@ -576,29 +586,29 @@ const NodeInspector: FC = () => {
                                     }),
                                   ]}
                                 >
-                                  {type === "string" && (
+                                  {isStringType(type) && (
                                     <TextArea autoSize disabled={disabled} onBlur={form.submit} />
                                   )}
-                                  {type === "json" && (
+                                  {isJsonType(type) && (
                                     <TextArea autoSize disabled={disabled} onBlur={form.submit} />
                                   )}
-                                  {type === "int" && (
+                                  {isIntType(type) && (
                                     <InputNumber
                                       disabled={disabled}
                                       onBlur={form.submit}
                                       precision={0}
                                     />
                                   )}
-                                  {type === "float" && (
+                                  {isFloatType(type) && (
                                     <InputNumber disabled={disabled} onBlur={form.submit} />
                                   )}
-                                  {type === "boolean" && (
+                                  {isBoolType(type) && (
                                     <Switch disabled={disabled} onChange={form.submit} />
                                   )}
-                                  {type === "code" && (
+                                  {isExprType(type) && (
                                     <Input disabled={disabled} onBlur={form.submit} />
                                   )}
-                                  {type === "enum" && (
+                                  {isEnumType(type) && (
                                     <Select
                                       showSearch
                                       disabled={disabled}
@@ -639,8 +649,8 @@ const NodeInspector: FC = () => {
                               <Button
                                 type="dashed"
                                 onClick={() => {
-                                  add(arg.default ?? type === "boolean" ? false : "");
-                                  if (type === "boolean") {
+                                  add(arg.default ?? isBoolType(type) ? false : "");
+                                  if (isBoolType(type)) {
                                     form.submit();
                                   }
                                 }}
@@ -663,13 +673,13 @@ const NodeInspector: FC = () => {
                       name={`args.${arg.name}`}
                       key={`args.${arg.name}`}
                       label={arg.desc}
-                      initialValue={type === "boolean" ? arg.default ?? false : arg.default}
-                      valuePropName={type === "boolean" ? "checked" : undefined}
+                      initialValue={isBoolType(type) ? arg.default ?? false : arg.default}
+                      valuePropName={isBoolType(type) ? "checked" : undefined}
                       rules={[
                         { required, message: t("node.fileRequired", { field: arg.desc }) },
                         ({ getFieldValue, setFieldValue, isFieldValidating, validateFields }) => ({
                           validator(_, value) {
-                            if (value && type === "json") {
+                            if (value && isJsonType(type)) {
                               try {
                                 if (value !== "null") {
                                   JSON.parse(value);
@@ -716,19 +726,21 @@ const NodeInspector: FC = () => {
                         }),
                       ]}
                     >
-                      {type === "string" && (
+                      {isStringType(type) && (
                         <TextArea autoSize disabled={disabled} onBlur={form.submit} />
                       )}
-                      {type === "json" && (
+                      {isJsonType(type) && (
                         <TextArea autoSize disabled={disabled} onBlur={form.submit} />
                       )}
-                      {type === "int" && (
+                      {isIntType(type) && (
                         <InputNumber disabled={disabled} onBlur={form.submit} precision={0} />
                       )}
-                      {type === "float" && <InputNumber disabled={disabled} onBlur={form.submit} />}
-                      {type === "boolean" && <Switch disabled={disabled} onChange={form.submit} />}
-                      {type === "code" && <Input disabled={disabled} onBlur={form.submit} />}
-                      {type === "enum" && (
+                      {isFloatType(type) && (
+                        <InputNumber disabled={disabled} onBlur={form.submit} />
+                      )}
+                      {isBoolType(type) && <Switch disabled={disabled} onChange={form.submit} />}
+                      {isExprType(type) && <Input disabled={disabled} onBlur={form.submit} />}
+                      {isEnumType(type) && (
                         <Select
                           showSearch
                           disabled={disabled}
diff --git a/src/misc/b3type.ts b/src/misc/b3type.ts
index 14fff18..2098fc0 100644
--- a/src/misc/b3type.ts
+++ b/src/misc/b3type.ts
@@ -5,10 +5,10 @@ export type NodeType = "Action" | "Composite" | "Decorator" | "Condition" | "Oth
 export interface NodeArg {
   name: string;
   type:
-    | "boolean"
-    | "boolean?"
-    | "boolean[]"
-    | "boolean[]?"
+    | "bool"
+    | "bool?"
+    | "bool[]"
+    | "bool[]?"
     | "int"
     | "int?"
     | "int[]"
@@ -29,16 +29,24 @@ export interface NodeArg {
     | "enum?"
     | "enum[]"
     | "enum[]?"
-    | "code"
-    | "code?"
-    | "code[]"
-    | "code[]?";
+    | "expr"
+    | "expr?"
+    | "expr[]"
+    | "expr[]?";
   desc: string;
   oneof?: string;
   default?: unknown;
   options?: { name: string; value: string | number }[];
 }
 
+export const isIntType = (type: string) => type.startsWith("int");
+export const isFloatType = (type: string) => type.startsWith("float");
+export const isStringType = (type: string) => type.startsWith("string");
+export const isBoolType = (type: string) => type.startsWith("bool");
+export const isEnumType = (type: string) => type.startsWith("enum");
+export const isExprType = (type: string) => type.startsWith("expr") || type.startsWith("code");
+export const isJsonType = (type: string) => type.startsWith("json");
+
 export interface NodeDef {
   name: string;
   type: NodeType;
diff --git a/src/misc/b3util.ts b/src/misc/b3util.ts
index 6d7892c..7c178cc 100644
--- a/src/misc/b3util.ts
+++ b/src/misc/b3util.ts
@@ -1,5 +1,19 @@
 import { useWorkspace } from "@/contexts/workspace-context";
-import { NodeArg, NodeDef, NodeModel, TreeGraphData, TreeModel } from "@/misc/b3type";
+import {
+  isBoolType,
+  isEnumType,
+  isExprType,
+  isFloatType,
+  isIntType,
+  isJsonType,
+  isStringType,
+  NodeArg,
+  NodeDef,
+  NodeModel,
+  TreeGraphData,
+  TreeModel,
+  unknownNodeDef,
+} from "@/misc/b3type";
 import i18n from "@/misc/i18n";
 import * as fs from "fs";
 import { message } from "./hooks";
@@ -130,7 +144,7 @@ export const checkNodeArgValue = (
 ) => {
   let hasError = false;
   const type = getNodeArgRawType(arg);
-  if (type === "float") {
+  if (isFloatType(type)) {
     const isNumber = typeof value === "number";
     const isOptional = value === undefined && isNodeArgOptional(arg);
     if (!(isNumber || isOptional)) {
@@ -139,7 +153,7 @@ export const checkNodeArgValue = (
       }
       hasError = true;
     }
-  } else if (type === "int") {
+  } else if (isIntType(type)) {
     const isInt = typeof value === "number" && value === Math.floor(value);
     const isOptional = value === undefined && isNodeArgOptional(arg);
     if (!(isInt || isOptional)) {
@@ -148,7 +162,7 @@ export const checkNodeArgValue = (
       }
       hasError = true;
     }
-  } else if (type === "string") {
+  } else if (isStringType(type)) {
     const isString = typeof value === "string" && value;
     const isOptional = (value === undefined || value === "") && isNodeArgOptional(arg);
     if (!(isString || isOptional)) {
@@ -157,7 +171,7 @@ export const checkNodeArgValue = (
       }
       hasError = true;
     }
-  } else if (type === "enum") {
+  } else if (isEnumType(type)) {
     const isEnum = !!arg.options?.find((option) => option.value === value);
     const isOptional = value === undefined && isNodeArgOptional(arg);
     if (!(isEnum || isOptional)) {
@@ -166,16 +180,16 @@ export const checkNodeArgValue = (
       }
       hasError = true;
     }
-  } else if (type === "code") {
-    const isCode = typeof value === "string" && value;
+  } else if (isExprType(type)) {
+    const isExpr = typeof value === "string" && value;
     const isOptional = (value === undefined || value === "") && isNodeArgOptional(arg);
-    if (!(isCode || isOptional)) {
+    if (!(isExpr || isOptional)) {
       if (verbose) {
-        error(data, `'${arg.name}=${JSON.stringify(value)}' is not a string`);
+        error(data, `'${arg.name}=${JSON.stringify(value)}' is not an expr string`);
       }
       hasError = true;
     }
-  } else if (type === "json") {
+  } else if (isJsonType(type)) {
     const isJson = value !== undefined && value !== "";
     const isOptional = isNodeArgOptional(arg);
     if (!(isJson || isOptional)) {
@@ -184,6 +198,16 @@ export const checkNodeArgValue = (
       }
       hasError = true;
     }
+  } else if (isBoolType(type)) {
+    const isBool = typeof value === "boolean" || value === undefined;
+    if (!isBool) {
+      if (verbose) {
+        error(data, `'${arg.name}=${JSON.stringify(value)}' is not a boolean`);
+      }
+      hasError = true;
+    }
+  } else {
+    error(data, `unknown arg type '${arg.type}'`);
   }
 
   return !hasError;
@@ -240,8 +264,14 @@ export const checkNodeData = (data: NodeModel | null | undefined) => {
   if (!data) {
     return false;
   }
-  let hasError = false;
   const conf = useWorkspace.getState().getNodeDef(data.name);
+  if (conf.name === unknownNodeDef.name) {
+    error(data, `undefined node: ${data.name}`);
+    return false;
+  }
+
+  let hasError = false;
+
   if (conf.children !== undefined && conf.children !== -1) {
     const count = data.children?.length || 0;
     if (conf.children !== count) {