fix(langchain): patch prompts created from runs fix (#9586)

Author: hntrl

.changeset/clever-bottles-yell.md

@@ -0,0 +1,5 @@
+---
+"langchain": patch
+---
+
+patch prompts created from runs fix

libs/langchain/src/hub/node.ts

@@ -8,10 +8,31 @@ import {
 import { load } from "../load/index.js";
 import { getChatModelByClassName } from "../chat_models/universal.js";
 
-// TODO: Make this the default, add web entrypoint in next breaking release
-
 export { basePush as push } from "./base.js";
 
+function _idEquals(a: string[], b: string[]): boolean {
+  if (!Array.isArray(a) || !Array.isArray(b)) {
+    return false;
+  }
+  if (a.length !== b.length) {
+    return false;
+  }
+  for (let i = 0; i < a.length; i++) {
+    if (a[i] !== b[i]) {
+      return false;
+    }
+  }
+  return true;
+}
+
+function isRunnableBinding(a: string[]): boolean {
+  const wellKnownIds = [
+    ["langchain_core", "runnables", "RunnableBinding"],
+    ["langchain", "schema", "runnable", "RunnableBinding"],
+  ];
+  return wellKnownIds.some((id) => _idEquals(a, id));
+}
+
 /**
  * Pull a prompt from the hub.
  * @param ownerRepoCommit The name of the repo containing the prompt, as well as an optional commit hash separated by a slash.
@@ -33,9 +54,14 @@ export async function pull<T extends Runnable>(
   const promptObject = await basePull(ownerRepoCommit, options);
   let modelClass;
   if (options?.includeModel) {
-    if (Array.isArray(promptObject.manifest.kwargs?.last?.kwargs?.bound?.id)) {
-      const modelName =
-        promptObject.manifest.kwargs?.last?.kwargs?.bound?.id.at(-1);
+    const chatModelObject = isRunnableBinding(
+      promptObject.manifest.kwargs?.last?.id
+    )
+      ? promptObject.manifest.kwargs?.last?.kwargs?.bound
+      : promptObject.manifest.kwargs?.last;
+
+    if (Array.isArray(chatModelObject?.id)) {
+      const modelName = chatModelObject?.id.at(-1);
 
       if (modelName) {
         modelClass = await getChatModelByClassName(modelName);