chore(sdk): add description field for assistants auth handlers (#1644)

Co-authored-by: David Duong <david@duong.cz>

.changeset/stale-islands-grow.md

@@ -0,0 +1,5 @@
+---
+"@langchain/langgraph-sdk": patch
+---
+
+Add `description` field for assistants auth handlers

libs/sdk/src/auth/types.ts

@@ -21,6 +21,7 @@ interface AssistantCreate {
   context?: Maybe<unknown>;
   if_exists?: Maybe<"raise" | "do_nothing">;
   name?: Maybe<string>;
+  description?: Maybe<string>;
   graph_id: string;
 }
 
@@ -42,6 +43,7 @@ interface AssistantUpdate {
   context?: Maybe<unknown>;
   graph_id?: Maybe<string>;
   name?: Maybe<string>;
+  description?: Maybe<string>;
   version?: Maybe<number>;
 }