diff --git a/docs/source/developers/index.md b/docs/source/developers/index.md
index 46b6c5719..465b5d1ee 100644
--- a/docs/source/developers/index.md
+++ b/docs/source/developers/index.md
@@ -492,7 +492,7 @@ def create_llm_chain(
         prompt_template = FIX_PROMPT_TEMPLATE
         self.prompt_template = prompt_template
 
-        runnable = prompt_template | llm  # type:ignore
+        runnable = prompt_template | llm | StrOutputParser()  # type:ignore
         self.llm_chain = runnable
 ```
 
diff --git a/packages/jupyter-ai/jupyter_ai/chat_handlers/default.py b/packages/jupyter-ai/jupyter_ai/chat_handlers/default.py
index 266ad73ad..852220be1 100644
--- a/packages/jupyter-ai/jupyter_ai/chat_handlers/default.py
+++ b/packages/jupyter-ai/jupyter_ai/chat_handlers/default.py
@@ -3,6 +3,7 @@
 
 from jupyter_ai.models import HumanChatMessage
 from jupyter_ai_magics.providers import BaseProvider
+from langchain_core.output_parsers import StrOutputParser
 from langchain_core.runnables import ConfigurableFieldSpec
 from langchain_core.runnables.history import RunnableWithMessageHistory
 
@@ -37,7 +38,7 @@ def create_llm_chain(
         self.llm = llm
         self.prompt_template = prompt_template
 
-        runnable = prompt_template | llm  # type:ignore
+        runnable = prompt_template | llm | StrOutputParser()  # type:ignore
         if not llm.manages_history:
             runnable = RunnableWithMessageHistory(
                 runnable=runnable,  #  type:ignore[arg-type]
diff --git a/packages/jupyter-ai/jupyter_ai/chat_handlers/fix.py b/packages/jupyter-ai/jupyter_ai/chat_handlers/fix.py
index 390b93cf6..27ec4d024 100644
--- a/packages/jupyter-ai/jupyter_ai/chat_handlers/fix.py
+++ b/packages/jupyter-ai/jupyter_ai/chat_handlers/fix.py
@@ -3,6 +3,7 @@
 from jupyter_ai.models import CellWithErrorSelection, HumanChatMessage
 from jupyter_ai_magics.providers import BaseProvider
 from langchain.prompts import PromptTemplate
+from langchain_core.output_parsers import StrOutputParser
 
 from .base import BaseChatHandler, SlashCommandRoutingType
 
@@ -76,7 +77,7 @@ def create_llm_chain(
         self.llm = llm
         prompt_template = FIX_PROMPT_TEMPLATE
 
-        runnable = prompt_template | llm  # type:ignore
+        runnable = prompt_template | llm | StrOutputParser()  # type:ignore
         self.llm_chain = runnable
 
     async def process_message(self, message: HumanChatMessage):