diff --git a/libs/sdk-js/package.json b/libs/sdk-js/package.json
index 29f67ab5d..e820f7634 100644
--- a/libs/sdk-js/package.json
+++ b/libs/sdk-js/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@langchain/langgraph-sdk",
-  "version": "0.0.83",
+  "version": "0.0.84",
   "description": "Client library for interacting with the LangGraph API",
   "type": "module",
   "packageManager": "yarn@1.22.19",
diff --git a/libs/sdk-js/src/types.messages.ts b/libs/sdk-js/src/types.messages.ts
index 62f2e6d5d..49123cf1a 100644
--- a/libs/sdk-js/src/types.messages.ts
+++ b/libs/sdk-js/src/types.messages.ts
@@ -70,6 +70,15 @@ export type ToolMessage = {
   tool_call_id: string;
   additional_kwargs?: MessageAdditionalKwargs | undefined;
   response_metadata?: Record<string, unknown> | undefined;
+  /**
+   * Artifact of the Tool execution which is not meant to be sent to the model.
+   *
+   * Should only be specified if it is different from the message content, e.g. if only
+   * a subset of the full tool output is being passed as message content but the full
+   * output is needed in other parts of the code.
+   */
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  artifact?: any;
 };
 
 export type SystemMessage = {