diff --git a/homeassistant/components/llama_cpp/entity.py b/homeassistant/components/llama_cpp/entity.py
index 5a9910f93baa..dd8cac74468e 100644
--- a/homeassistant/components/llama_cpp/entity.py
+++ b/homeassistant/components/llama_cpp/entity.py
@@ -104,7 +104,9 @@ def _convert_content_to_chat_message(
         return ChatCompletionToolMessageParam(
             role="tool",
             tool_call_id=content.tool_call_id,
-            content=json_dumps(content.tool_result),
+            content=json_dumps(
+                {"data": content.result.data, "error": content.result.error}
+            ),
         )
 
     role: Literal["user", "assistant", "system"] = content.role
@@ -177,7 +179,9 @@ def _convert_content_to_param(
         return ChatCompletionToolMessageParam(
             role="tool",
             tool_call_id=content.tool_call_id,
-            content=json_dumps(content.tool_result),
+            content=json_dumps(
+                {"data": content.result.data, "error": content.result.error}
+            ),
         )
     if not isinstance(content, conversation.AssistantContent) or not content.tool_calls:
         if isinstance(content, conversation.SystemContent):