From e12f570ead16547b0dee11f61ea429d8a79d4f5d Mon Sep 17 00:00:00 2001
From: Mohammad Mohtashim <45242107+keenborder786@users.noreply.github.com>
Date: Tue, 1 Oct 2024 00:54:51 +0500
Subject: [PATCH] Merge pull request #26794

* [chore]: Agent Observation should be casted to string to avoid errors

* Merge branch 'master' into fix_observation_type_streaming

* [chore]: Using Json.dumps

* [chore]: Exact same logic as  when casting agent oobservation to string
---
 libs/core/langchain_core/agents.py | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/libs/core/langchain_core/agents.py b/libs/core/langchain_core/agents.py
index 39393317473..6e8cdc975eb 100644
--- a/libs/core/langchain_core/agents.py
+++ b/libs/core/langchain_core/agents.py
@@ -189,10 +189,17 @@ def _convert_agent_observation_to_messages(
     Returns:
         AIMessage that corresponds to the original tool invocation.
     """
+
     if isinstance(agent_action, AgentActionMessageLog):
         return [_create_function_message(agent_action, observation)]
     else:
-        return [HumanMessage(content=observation)]
+        content = observation
+        if not isinstance(observation, str):
+            try:
+                content = json.dumps(observation, ensure_ascii=False)
+            except Exception:
+                content = str(observation)
+        return [HumanMessage(content=content)]
 
 
 def _create_function_message(