From 947a5b5e87bea6095fd7b642762c88bc4416f539 Mon Sep 17 00:00:00 2001
From: Noah Stapp <noah.stapp@mongodb.com>
Date: Mon, 17 Nov 2025 14:20:10 -0500
Subject: [PATCH 1/6] INTPYTHON-828 - Make Langchain-MongoDB compatible with
 LangChain >= 1.0

---
 .../retrievers/parent_document.py             |  10 +-
 .../retrievers/self_querying.py               |  18 +-
 libs/langchain-mongodb/pyproject.toml         |  21 +-
 .../integration_tests/test_agent_toolkit.py   |  15 +-
 .../test_chat_message_histories.py            |   9 +-
 .../test_retriever_selfquerying.py            |  17 +-
 .../unit_tests/test_chat_message_histories.py |  10 +-
 libs/langchain-mongodb/uv.lock                | 120 +++++----
 pyproject.toml                                |   2 +-
 uv.lock                                       | 255 +++++++++++++++---
 10 files changed, 373 insertions(+), 104 deletions(-)

diff --git a/libs/langchain-mongodb/langchain_mongodb/retrievers/parent_document.py b/libs/langchain-mongodb/langchain_mongodb/retrievers/parent_document.py
index 78255c99..1353e5ca 100644
--- a/libs/langchain-mongodb/langchain_mongodb/retrievers/parent_document.py
+++ b/libs/langchain-mongodb/langchain_mongodb/retrievers/parent_document.py
@@ -3,7 +3,15 @@
 from typing import Any, List, Optional
 
 import pymongo
-from langchain.retrievers.parent_document_retriever import ParentDocumentRetriever
+
+try:
+    from langchain.retrievers.parent_document_retriever import (  # type: ignore[import-not-found]
+        ParentDocumentRetriever,
+    )
+except ImportError:
+    from langchain_classic.retrievers.parent_document_retriever import (  # type: ignore[import-not-found]
+        ParentDocumentRetriever,
+    )
 from langchain_core.callbacks import (
     AsyncCallbackManagerForRetrieverRun,
     CallbackManagerForRetrieverRun,
diff --git a/libs/langchain-mongodb/langchain_mongodb/retrievers/self_querying.py b/libs/langchain-mongodb/langchain_mongodb/retrievers/self_querying.py
index 554244a8..859e3118 100644
--- a/libs/langchain-mongodb/langchain_mongodb/retrievers/self_querying.py
+++ b/libs/langchain-mongodb/langchain_mongodb/retrievers/self_querying.py
@@ -1,7 +1,21 @@
 from typing import Any, Dict, Sequence, Tuple, Union
 
-from langchain.chains.query_constructor.schema import AttributeInfo
-from langchain.retrievers.self_query.base import SelfQueryRetriever
+try:
+    from langchain.chains.query_constructor.schema import (  # type: ignore[import-not-found]
+        AttributeInfo,
+    )
+except ImportError:
+    from langchain_classic.chains.query_constructor.schema import (  # type: ignore[import-not-found]
+        AttributeInfo,
+    )
+try:
+    from langchain.retrievers.self_query.base import (  # type: ignore[import-not-found]
+        SelfQueryRetriever,
+    )
+except ImportError:
+    from langchain_classic.retrievers.self_query.base import (  # type: ignore[import-not-found]
+        SelfQueryRetriever,
+    )
 from langchain_core.language_models import BaseLanguageModel
 from langchain_core.runnables import Runnable
 from langchain_core.structured_query import (
diff --git a/libs/langchain-mongodb/pyproject.toml b/libs/langchain-mongodb/pyproject.toml
index 07ac4982..b8db16f5 100644
--- a/libs/langchain-mongodb/pyproject.toml
+++ b/libs/langchain-mongodb/pyproject.toml
@@ -10,10 +10,11 @@ description = "An integration package connecting MongoDB and LangChain"
 readme = "README.md"
 requires-python = ">=3.10"
 dependencies = [
-    "langchain-core>=0.3,<1.0",
-    "langchain>=0.3,<1.0",
+    "langchain-core>=1.0",
+    "langchain>=1.0",
+    "langchain-classic>=1.0",
     "pymongo>=4.6.1",
-    "langchain-text-splitters>=0.3,<1.0",
+    "langchain-text-splitters>=1.0",
     "numpy>=1.26",
     "lark<2.0.0,>=1.1.9",
 ]
@@ -21,9 +22,9 @@ dependencies = [
 [dependency-groups]
 dev = [
     "freezegun>=1.2.2",
-    "langchain>=0.3.14,<1.0",
-    "langchain-core>=0.3.29,<1.0",
-    "langchain-text-splitters>=0.3.5,<1.0",
+    "langchain>=1.0",
+    "langchain-core>=1.0",
+    "langchain-text-splitters>=1.0",
     "pytest-mock>=3.10.0",
     "pytest>=7.3.0",
     "syrupy>=4.0.2",
@@ -33,13 +34,13 @@ dev = [
     "pre-commit>=4.0",
     "mypy>=1.10",
     "simsimd>=6.5.0",
-    "langchain-ollama>=0.2.2,<1.0",
-    "langchain-openai>=0.2.14,<1.0",
-    "langchain-community>=0.3.27,<1.0",
+    "langchain-ollama>=1.0",
+    "langchain-openai>=1.0",
+    "langchain-community>=0.3.27",
     "pypdf>=5.0.1",
     "langgraph>=0.2.72",
     "flaky>=3.8.1",
-    "langchain-tests==0.3.22,<1.0",
+    "langchain-tests==0.3.22",
     "pip>=25.0.1",
     "typing-extensions>=4.12.2",
 ]
diff --git a/libs/langchain-mongodb/tests/integration_tests/test_agent_toolkit.py b/libs/langchain-mongodb/tests/integration_tests/test_agent_toolkit.py
index d5b1ae5f..1be4a412 100644
--- a/libs/langchain-mongodb/tests/integration_tests/test_agent_toolkit.py
+++ b/libs/langchain-mongodb/tests/integration_tests/test_agent_toolkit.py
@@ -5,7 +5,15 @@
 import requests
 from flaky import flaky  # type:ignore[import-untyped]
 from langchain_openai import AzureChatOpenAI, ChatOpenAI
-from langgraph.prebuilt import create_react_agent
+
+try:
+    from langgraph.prebuilt import create_react_agent as create_agent
+
+    _HAVE_V1 = False
+except ImportError:
+    from langchain.agents import create_agent  # type: ignore[assignment]
+
+    _HAVE_V1 = True
 from pymongo import MongoClient
 
 from langchain_mongodb.agent_toolkit import (
@@ -64,7 +72,10 @@ def test_toolkit_response(db):
     prompt = MONGODB_AGENT_SYSTEM_PROMPT.format(top_k=5)
 
     test_query = "Which country's customers spent the most?"
-    agent = create_react_agent(llm, toolkit.get_tools(), prompt=prompt)
+    if _HAVE_V1:
+        agent = create_agent(llm, toolkit.get_tools(), system_prompt=prompt)
+    else:
+        agent = create_agent(llm, toolkit.get_tools(), prompt=prompt)
     agent.step_timeout = 60
     events = agent.stream(
         {"messages": [("user", test_query)]},
diff --git a/libs/langchain-mongodb/tests/integration_tests/test_chat_message_histories.py b/libs/langchain-mongodb/tests/integration_tests/test_chat_message_histories.py
index 39386ecc..b88e711a 100644
--- a/libs/langchain-mongodb/tests/integration_tests/test_chat_message_histories.py
+++ b/libs/langchain-mongodb/tests/integration_tests/test_chat_message_histories.py
@@ -1,7 +1,14 @@
 import json
 import warnings
 
-from langchain.memory import ConversationBufferMemory  # type: ignore[import-not-found]
+try:
+    from langchain.memory import (  # type: ignore[import-not-found]
+        ConversationBufferMemory,
+    )
+except ImportError:
+    from langchain_classic.memory import (  # type: ignore[import-not-found]
+        ConversationBufferMemory,
+    )
 from langchain_core.messages import message_to_dict
 
 from langchain_mongodb.chat_message_histories import MongoDBChatMessageHistory
diff --git a/libs/langchain-mongodb/tests/integration_tests/test_retriever_selfquerying.py b/libs/langchain-mongodb/tests/integration_tests/test_retriever_selfquerying.py
index f94b5d23..a64071eb 100644
--- a/libs/langchain-mongodb/tests/integration_tests/test_retriever_selfquerying.py
+++ b/libs/langchain-mongodb/tests/integration_tests/test_retriever_selfquerying.py
@@ -4,8 +4,21 @@
 from typing import Generator, Sequence, Union
 
 import pytest
-from langchain.chains.query_constructor.schema import AttributeInfo
-from langchain.retrievers.self_query.base import SelfQueryRetriever
+
+try:
+    from langchain.chains.query_constructor.schema import (  # type: ignore[import-not-found]
+        AttributeInfo,
+    )
+    from langchain.retrievers.self_query.base import (  # type: ignore[import-not-found]
+        SelfQueryRetriever,
+    )
+except ImportError:
+    from langchain_classic.chains.query_constructor.schema import (  # type: ignore[import-not-found]
+        AttributeInfo,
+    )
+    from langchain_classic.retrievers.self_query.base import (  # type: ignore[import-not-found]
+        SelfQueryRetriever,
+    )
 from langchain_core.documents import Document
 from langchain_openai import AzureChatOpenAI, ChatOpenAI
 from langchain_openai.chat_models.base import BaseChatOpenAI
diff --git a/libs/langchain-mongodb/tests/unit_tests/test_chat_message_histories.py b/libs/langchain-mongodb/tests/unit_tests/test_chat_message_histories.py
index a9f198b8..e53359c5 100644
--- a/libs/langchain-mongodb/tests/unit_tests/test_chat_message_histories.py
+++ b/libs/langchain-mongodb/tests/unit_tests/test_chat_message_histories.py
@@ -3,7 +3,15 @@
 
 import mongomock
 import pytest
-from langchain.memory import ConversationBufferMemory  # type: ignore[import-not-found]
+
+try:
+    from langchain.memory import (  # type: ignore[import-not-found]
+        ConversationBufferMemory,
+    )
+except ImportError:
+    from langchain_classic.memory import (  # type: ignore[import-not-found]
+        ConversationBufferMemory,
+    )
 from langchain_core.messages import message_to_dict
 from pytest_mock import MockerFixture
 
diff --git a/libs/langchain-mongodb/uv.lock b/libs/langchain-mongodb/uv.lock
index f96e8612..9a782c36 100644
--- a/libs/langchain-mongodb/uv.lock
+++ b/libs/langchain-mongodb/uv.lock
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diff --git a/pyproject.toml b/pyproject.toml
index ee910346..379f8530 100644
--- a/pyproject.toml
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diff --git a/uv.lock b/uv.lock
index d3121500..331fc37e 100644
--- a/uv.lock
+++ b/uv.lock
@@ -1,8 +1,9 @@
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-    { name = "langchain" },
+    { name = "langchain-classic" },
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@@ -771,6 +787,7 @@ version = "0.7.2"
 source = { editable = "libs/langchain-mongodb" }
 dependencies = [
     { name = "langchain" },
+    { name = "langchain-classic" },
     { name = "langchain-core" },
     { name = "langchain-text-splitters" },
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-    { name = "langchain-text-splitters", specifier = ">=0.3,<1.0" },
+    { name = "langchain", specifier = ">=1.0" },
+    { name = "langchain-classic", specifier = ">=1.0" },
+    { name = "langchain-core", specifier = ">=1.0" },
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+]
+
 [[package]]
 name = "yarl"
 version = "1.19.0"

From e28fe19009ba9c6da1dee12af86fcf583e1f8de8 Mon Sep 17 00:00:00 2001
From: Noah Stapp <noah.stapp@mongodb.com>
Date: Mon, 17 Nov 2025 14:46:18 -0500
Subject: [PATCH 2/6] Update langgraph dependency

---
 libs/langchain-mongodb/pyproject.toml | 2 +-
 libs/langchain-mongodb/uv.lock        | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/libs/langchain-mongodb/pyproject.toml b/libs/langchain-mongodb/pyproject.toml
index b8db16f5..eb92a775 100644
--- a/libs/langchain-mongodb/pyproject.toml
+++ b/libs/langchain-mongodb/pyproject.toml
@@ -38,7 +38,7 @@ dev = [
     "langchain-openai>=1.0",
     "langchain-community>=0.3.27",
     "pypdf>=5.0.1",
-    "langgraph>=0.2.72",
+    "langgraph>=1.0.0",
     "flaky>=3.8.1",
     "langchain-tests==0.3.22",
     "pip>=25.0.1",
diff --git a/libs/langchain-mongodb/uv.lock b/libs/langchain-mongodb/uv.lock
index 9a782c36..fa73b78d 100644
--- a/libs/langchain-mongodb/uv.lock
+++ b/libs/langchain-mongodb/uv.lock
@@ -849,7 +849,7 @@ dev = [
     { name = "langchain-openai", specifier = ">=1.0" },
     { name = "langchain-tests", specifier = "==0.3.22" },
     { name = "langchain-text-splitters", specifier = ">=1.0" },
-    { name = "langgraph", specifier = ">=0.2.72" },
+    { name = "langgraph", specifier = ">=1.0.0" },
     { name = "mongomock", specifier = ">=4.2.0.post1" },
     { name = "mypy", specifier = ">=1.10" },
     { name = "pip", specifier = ">=25.0.1" },

From 3553ff1ad80050f18bef1c6165aa33fcd041d581 Mon Sep 17 00:00:00 2001
From: Noah Stapp <noah.stapp@mongodb.com>
Date: Mon, 17 Nov 2025 16:58:38 -0500
Subject: [PATCH 3/6] Refactor

---
 libs/langchain-mongodb/CHANGELOG.md           |  4 ++++
 .../retrievers/parent_document.py             | 12 +++-------
 .../retrievers/self_querying.py               | 22 +++++--------------
 .../integration_tests/test_agent_toolkit.py   | 15 ++-----------
 .../test_chat_message_histories.py            | 11 +++-------
 .../test_retriever_selfquerying.py            | 21 +++++-------------
 .../unit_tests/test_chat_message_histories.py | 12 +++-------
 7 files changed, 27 insertions(+), 70 deletions(-)

diff --git a/libs/langchain-mongodb/CHANGELOG.md b/libs/langchain-mongodb/CHANGELOG.md
index 9ddc5e76..fec77b2d 100644
--- a/libs/langchain-mongodb/CHANGELOG.md
+++ b/libs/langchain-mongodb/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ---
 
+## Changes in version 0.8.0 (2025/11/18)
+
+- Update dependencies to align with LangChain 1.0, which is now the minimum supported version of LangChain.
+
 ## Changes in version 0.7.2 (2025/10/30)
 
 - Pin LangChain version to < 1.0 to avoid compatibility issues while in pre-1.0.
diff --git a/libs/langchain-mongodb/langchain_mongodb/retrievers/parent_document.py b/libs/langchain-mongodb/langchain_mongodb/retrievers/parent_document.py
index 1353e5ca..a4ef90c8 100644
--- a/libs/langchain-mongodb/langchain_mongodb/retrievers/parent_document.py
+++ b/libs/langchain-mongodb/langchain_mongodb/retrievers/parent_document.py
@@ -3,15 +3,9 @@
 from typing import Any, List, Optional
 
 import pymongo
-
-try:
-    from langchain.retrievers.parent_document_retriever import (  # type: ignore[import-not-found]
-        ParentDocumentRetriever,
-    )
-except ImportError:
-    from langchain_classic.retrievers.parent_document_retriever import (  # type: ignore[import-not-found]
-        ParentDocumentRetriever,
-    )
+from langchain_classic.retrievers.parent_document_retriever import (
+    ParentDocumentRetriever,
+)
 from langchain_core.callbacks import (
     AsyncCallbackManagerForRetrieverRun,
     CallbackManagerForRetrieverRun,
diff --git a/libs/langchain-mongodb/langchain_mongodb/retrievers/self_querying.py b/libs/langchain-mongodb/langchain_mongodb/retrievers/self_querying.py
index 859e3118..fa5ddf1f 100644
--- a/libs/langchain-mongodb/langchain_mongodb/retrievers/self_querying.py
+++ b/libs/langchain-mongodb/langchain_mongodb/retrievers/self_querying.py
@@ -1,21 +1,11 @@
 from typing import Any, Dict, Sequence, Tuple, Union
 
-try:
-    from langchain.chains.query_constructor.schema import (  # type: ignore[import-not-found]
-        AttributeInfo,
-    )
-except ImportError:
-    from langchain_classic.chains.query_constructor.schema import (  # type: ignore[import-not-found]
-        AttributeInfo,
-    )
-try:
-    from langchain.retrievers.self_query.base import (  # type: ignore[import-not-found]
-        SelfQueryRetriever,
-    )
-except ImportError:
-    from langchain_classic.retrievers.self_query.base import (  # type: ignore[import-not-found]
-        SelfQueryRetriever,
-    )
+from langchain_classic.chains.query_constructor.schema import (
+    AttributeInfo,
+)
+from langchain_classic.retrievers.self_query.base import (
+    SelfQueryRetriever,
+)
 from langchain_core.language_models import BaseLanguageModel
 from langchain_core.runnables import Runnable
 from langchain_core.structured_query import (
diff --git a/libs/langchain-mongodb/tests/integration_tests/test_agent_toolkit.py b/libs/langchain-mongodb/tests/integration_tests/test_agent_toolkit.py
index 1be4a412..b0a2b80d 100644
--- a/libs/langchain-mongodb/tests/integration_tests/test_agent_toolkit.py
+++ b/libs/langchain-mongodb/tests/integration_tests/test_agent_toolkit.py
@@ -4,16 +4,8 @@
 import pytest
 import requests
 from flaky import flaky  # type:ignore[import-untyped]
+from langchain.agents import create_agent  # type: ignore[assignment]
 from langchain_openai import AzureChatOpenAI, ChatOpenAI
-
-try:
-    from langgraph.prebuilt import create_react_agent as create_agent
-
-    _HAVE_V1 = False
-except ImportError:
-    from langchain.agents import create_agent  # type: ignore[assignment]
-
-    _HAVE_V1 = True
 from pymongo import MongoClient
 
 from langchain_mongodb.agent_toolkit import (
@@ -72,10 +64,7 @@ def test_toolkit_response(db):
     prompt = MONGODB_AGENT_SYSTEM_PROMPT.format(top_k=5)
 
     test_query = "Which country's customers spent the most?"
-    if _HAVE_V1:
-        agent = create_agent(llm, toolkit.get_tools(), system_prompt=prompt)
-    else:
-        agent = create_agent(llm, toolkit.get_tools(), prompt=prompt)
+    agent = create_agent(llm, toolkit.get_tools(), system_prompt=prompt)
     agent.step_timeout = 60
     events = agent.stream(
         {"messages": [("user", test_query)]},
diff --git a/libs/langchain-mongodb/tests/integration_tests/test_chat_message_histories.py b/libs/langchain-mongodb/tests/integration_tests/test_chat_message_histories.py
index b88e711a..510c856a 100644
--- a/libs/langchain-mongodb/tests/integration_tests/test_chat_message_histories.py
+++ b/libs/langchain-mongodb/tests/integration_tests/test_chat_message_histories.py
@@ -1,14 +1,9 @@
 import json
 import warnings
 
-try:
-    from langchain.memory import (  # type: ignore[import-not-found]
-        ConversationBufferMemory,
-    )
-except ImportError:
-    from langchain_classic.memory import (  # type: ignore[import-not-found]
-        ConversationBufferMemory,
-    )
+from langchain_classic.memory import (
+    ConversationBufferMemory,
+)
 from langchain_core.messages import message_to_dict
 
 from langchain_mongodb.chat_message_histories import MongoDBChatMessageHistory
diff --git a/libs/langchain-mongodb/tests/integration_tests/test_retriever_selfquerying.py b/libs/langchain-mongodb/tests/integration_tests/test_retriever_selfquerying.py
index a64071eb..025fa3e8 100644
--- a/libs/langchain-mongodb/tests/integration_tests/test_retriever_selfquerying.py
+++ b/libs/langchain-mongodb/tests/integration_tests/test_retriever_selfquerying.py
@@ -4,21 +4,12 @@
 from typing import Generator, Sequence, Union
 
 import pytest
-
-try:
-    from langchain.chains.query_constructor.schema import (  # type: ignore[import-not-found]
-        AttributeInfo,
-    )
-    from langchain.retrievers.self_query.base import (  # type: ignore[import-not-found]
-        SelfQueryRetriever,
-    )
-except ImportError:
-    from langchain_classic.chains.query_constructor.schema import (  # type: ignore[import-not-found]
-        AttributeInfo,
-    )
-    from langchain_classic.retrievers.self_query.base import (  # type: ignore[import-not-found]
-        SelfQueryRetriever,
-    )
+from langchain_classic.chains.query_constructor.schema import (
+    AttributeInfo,
+)
+from langchain_classic.retrievers.self_query.base import (
+    SelfQueryRetriever,
+)
 from langchain_core.documents import Document
 from langchain_openai import AzureChatOpenAI, ChatOpenAI
 from langchain_openai.chat_models.base import BaseChatOpenAI
diff --git a/libs/langchain-mongodb/tests/unit_tests/test_chat_message_histories.py b/libs/langchain-mongodb/tests/unit_tests/test_chat_message_histories.py
index e53359c5..9bd817c8 100644
--- a/libs/langchain-mongodb/tests/unit_tests/test_chat_message_histories.py
+++ b/libs/langchain-mongodb/tests/unit_tests/test_chat_message_histories.py
@@ -3,15 +3,9 @@
 
 import mongomock
 import pytest
-
-try:
-    from langchain.memory import (  # type: ignore[import-not-found]
-        ConversationBufferMemory,
-    )
-except ImportError:
-    from langchain_classic.memory import (  # type: ignore[import-not-found]
-        ConversationBufferMemory,
-    )
+from langchain_classic.memory import (
+    ConversationBufferMemory,
+)
 from langchain_core.messages import message_to_dict
 from pytest_mock import MockerFixture
 

From 5ab8b9d9f5577551b7dec2defa1aaa721e0d46f4 Mon Sep 17 00:00:00 2001
From: Noah Stapp <noah.stapp@mongodb.com>
Date: Mon, 17 Nov 2025 17:05:36 -0500
Subject: [PATCH 4/6] Linting

---
 uv.lock | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/uv.lock b/uv.lock
index 331fc37e..d97d744d 100644
--- a/uv.lock
+++ b/uv.lock
@@ -817,7 +817,7 @@ dev = [
     { name = "langchain-openai", specifier = ">=1.0" },
     { name = "langchain-tests", specifier = "==0.3.22" },
     { name = "langchain-text-splitters", specifier = ">=1.0" },
-    { name = "langgraph", specifier = ">=0.2.72" },
+    { name = "langgraph", specifier = ">=1.0.0" },
     { name = "mongomock", specifier = ">=4.2.0.post1" },
     { name = "mypy", specifier = ">=1.10" },
     { name = "pip", specifier = ">=25.0.1" },

From 2864476ebd8364e747adb36013b8fc8f3dbeaed0 Mon Sep 17 00:00:00 2001
From: Noah Stapp <noah.stapp@mongodb.com>
Date: Tue, 18 Nov 2025 09:46:59 -0500
Subject: [PATCH 5/6] Update changelog

---
 libs/langchain-mongodb/CHANGELOG.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/libs/langchain-mongodb/CHANGELOG.md b/libs/langchain-mongodb/CHANGELOG.md
index fec77b2d..e4f3d078 100644
--- a/libs/langchain-mongodb/CHANGELOG.md
+++ b/libs/langchain-mongodb/CHANGELOG.md
@@ -5,6 +5,7 @@
 ## Changes in version 0.8.0 (2025/11/18)
 
 - Update dependencies to align with LangChain 1.0, which is now the minimum supported version of LangChain.
+  This includes adding `langchain_classic` as a dependency to support existing Retriever APIs.
 
 ## Changes in version 0.7.2 (2025/10/30)
 

From efec545db16c8a54fc02f0521f69ff1ebc381819 Mon Sep 17 00:00:00 2001
From: Noah Stapp <noah.stapp@mongodb.com>
Date: Tue, 18 Nov 2025 13:45:31 -0500
Subject: [PATCH 6/6] Fix _id handling for LLM pipeline generation

---
 .../langchain_mongodb/agent_toolkit/database.py              | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libs/langchain-mongodb/langchain_mongodb/agent_toolkit/database.py b/libs/langchain-mongodb/langchain_mongodb/agent_toolkit/database.py
index 31e8c5ef..a918ca5f 100644
--- a/libs/langchain-mongodb/langchain_mongodb/agent_toolkit/database.py
+++ b/libs/langchain-mongodb/langchain_mongodb/agent_toolkit/database.py
@@ -341,10 +341,15 @@ def _handle_object_id(match: Any) -> str:
                 raise ValueError("ObjectId must contain a value.")
             return f"ObjectId('{oid_str}')"
 
+        def _handle_id_key(match: Any) -> str:
+            return f'"{match.group(1)}"'
+
         patterns = [
             (r'ISODate\(\s*["\']([^"\']*)["\']\s*\)', _handle_iso_date),
             (r'new\s+Date\(\s*["\']([^"\']*)["\']\s*\)', _handle_new_date),
             (r'ObjectId\(\s*["\']([^"\']*)["\']\s*\)', _handle_object_id),
+            (r'ObjectId\(\s*["\']([^"\']*)["\']\s*\)', _handle_object_id),
+            (r'(?<!["\'])\b(_id)\b(?!["\'])', _handle_id_key),
         ]
 
         for pattern, replacer in patterns: