fix(sdk): use kind when checking for Studio user (#1411)

.changeset/pink-terms-attend.md

@@ -0,0 +1,8 @@
+---
+"@langchain/langgraph-api": patch
+"@langchain/langgraph-ui": patch
+"@langchain/langgraph-cli": patch
+"@langchain/langgraph-sdk": patch
+---
+
+fix(sdk): use `kind` when checking for Studio user

libs/langgraph-api/src/auth/custom.mts

@@ -61,6 +61,7 @@ export const handleAuthEvent = async <T extends keyof AuthEventValueMap>(
 };
 
 const STUDIO_USER = {
+  kind: "StudioUser",
   display_name: "langgraph-studio-user",
   identity: "langgraph-studio-user",
   permissions: [],

libs/sdk/src/auth/index.ts

@@ -49,6 +49,7 @@ export class Auth<
  * @returns True if the user is a studio user, false otherwise
  */
 export function isStudioUser(user: BaseUser) {
+  if ("kind" in user && user.kind === "StudioUser") return true;
   return user.identity === "langgraph-studio-user";
 }