Merge branch 'master' into redirect-new

MIGRATE.md

@@ -2,7 +2,6 @@
 
 Please see the following guides for migrating LangChain code:
 
-* Migrate to [LangChain v1.0](https://docs.langchain.com/oss/python/migrate/langchain-v1)
 * Migrate to [LangChain v0.3](https://python.langchain.com/docs/versions/v0_3/)
 * Migrate to [LangChain v0.2](https://python.langchain.com/docs/versions/v0_2/)
 * Migrating from [LangChain 0.0.x Chains](https://python.langchain.com/docs/versions/migrating_chains/)

libs/core/langchain_core/tools/base.py

@@ -1250,22 +1250,6 @@ def _is_injected_arg_type(
         `True` if the type is an injected argument, `False` otherwise.
     """
     injected_type = injected_type or InjectedToolArg
-
-    # if the type is a generic alias, check if the origin is a subclass of inj type
-    origin = get_origin(type_)
-    if (
-        origin is not None
-        and isinstance(origin, type)
-        and issubclass(origin, injected_type)
-    ):
-        return True
-
-    # check if the type is a subclass of the injected type
-    if isinstance(type_, type) and issubclass(type_, injected_type):
-        return True
-
-    # if the type is an Annotated type, check if any of the annotations
-    # are a subclass of the injected type
     return any(
         isinstance(arg, injected_type)
         or (isinstance(arg, type) and issubclass(arg, injected_type))

libs/langchain_v1/langchain/__init__.py

@@ -1,3 +1,3 @@
 """Main entrypoint into LangChain."""
 
-__version__ = "1.0.0rc2"
+__version__ = "1.0.0rc1"

libs/langchain_v1/langchain/agents/factory.py

@@ -1225,6 +1225,15 @@ def create_agent(  # noqa: PLR0915
     graph.add_edge(START, entry_node)
     # add conditional edges only if tools exist
     if tool_node is not None:
+        # Only include exit_node in destinations if any tool has return_direct=True
+        # or if there are structured output tools
+        tools_to_model_destinations = [loop_entry_node]
+        if (
+            any(tool.return_direct for tool in tool_node.tools_by_name.values())
+            or structured_output_tools
+        ):
+            tools_to_model_destinations.append(exit_node)
+
         graph.add_conditional_edges(
             "tools",
             _make_tools_to_model_edge(
@@ -1233,7 +1242,7 @@ def create_agent(  # noqa: PLR0915
                 structured_output_tools=structured_output_tools,
                 end_destination=exit_node,
             ),
-            [loop_entry_node, exit_node],
+            tools_to_model_destinations,
         )
 
         # base destinations are tools and exit_node

libs/langchain_v1/pyproject.toml

@@ -13,7 +13,7 @@ dependencies = [
 ]
 
 name = "langchain"
-version = "1.0.0rc2"
+version = "1.0.0rc1"
 description = "Building applications with LLMs through composability"
 readme = "README.md"
 

libs/langchain_v1/tests/unit_tests/agents/__snapshots__/test_middleware_agent.ambr

@@ -20,7 +20,6 @@
   	__start__ --> NoopZero\2ebefore_agent;
   	model -.-> NoopTwo\2eafter_agent;
   	model -.-> tools;
-  	tools -.-> NoopTwo\2eafter_agent;
   	tools -.-> model;
   	NoopOne\2eafter_agent --> __end__;
   	classDef default fill:#f2f0ff,line-height:1.2
@@ -343,7 +342,6 @@
   	__start__ --> NoopSeven\2ebefore_model;
   	model --> NoopEight\2eafter_model;
   	tools -.-> NoopSeven\2ebefore_model;
-  	tools -.-> __end__;
   	classDef default fill:#f2f0ff,line-height:1.2
   	classDef first fill-opacity:0
   	classDef last fill:#bfb6fc
@@ -376,7 +374,6 @@
   	__start__ --> NoopSeven\2ebefore_model;
   	model --> NoopEight\2eafter_model;
   	tools -.-> NoopSeven\2ebefore_model;
-  	tools -.-> __end__;
   	classDef default fill:#f2f0ff,line-height:1.2
   	classDef first fill-opacity:0
   	classDef last fill:#bfb6fc
@@ -409,7 +406,6 @@
   	__start__ --> NoopSeven\2ebefore_model;
   	model --> NoopEight\2eafter_model;
   	tools -.-> NoopSeven\2ebefore_model;
-  	tools -.-> __end__;
   	classDef default fill:#f2f0ff,line-height:1.2
   	classDef first fill-opacity:0
   	classDef last fill:#bfb6fc
@@ -442,7 +438,6 @@
   	__start__ --> NoopSeven\2ebefore_model;
   	model --> NoopEight\2eafter_model;
   	tools -.-> NoopSeven\2ebefore_model;
-  	tools -.-> __end__;
   	classDef default fill:#f2f0ff,line-height:1.2
   	classDef first fill-opacity:0
   	classDef last fill:#bfb6fc
@@ -475,7 +470,6 @@
   	__start__ --> NoopSeven\2ebefore_model;
   	model --> NoopEight\2eafter_model;
   	tools -.-> NoopSeven\2ebefore_model;
-  	tools -.-> __end__;
   	classDef default fill:#f2f0ff,line-height:1.2
   	classDef first fill-opacity:0
   	classDef last fill:#bfb6fc
@@ -497,7 +491,6 @@
   	__start__ --> model;
   	model -.-> __end__;
   	model -.-> tools;
-  	tools -.-> __end__;
   	tools -.-> model;
   	classDef default fill:#f2f0ff,line-height:1.2
   	classDef first fill-opacity:0

libs/langchain_v1/tests/unit_tests/agents/__snapshots__/test_return_direct_graph.ambr

@@ -0,0 +1,69 @@
+# serializer version: 1
+# name: test_agent_graph_with_mixed_tools
+  '''
+  ---
+  config:
+    flowchart:
+      curve: linear
+  ---
+  graph TD;
+  	__start__([<p>__start__</p>]):::first
+  	model(model)
+  	tools(tools)
+  	__end__([<p>__end__</p>]):::last
+  	__start__ --> model;
+  	model -.-> __end__;
+  	model -.-> tools;
+  	tools -.-> __end__;
+  	tools -.-> model;
+  	classDef default fill:#f2f0ff,line-height:1.2
+  	classDef first fill-opacity:0
+  	classDef last fill:#bfb6fc
+  
+  '''
+# ---
+# name: test_agent_graph_with_return_direct_tool
+  '''
+  ---
+  config:
+    flowchart:
+      curve: linear
+  ---
+  graph TD;
+  	__start__([<p>__start__</p>]):::first
+  	model(model)
+  	tools(tools)
+  	__end__([<p>__end__</p>]):::last
+  	__start__ --> model;
+  	model -.-> __end__;
+  	model -.-> tools;
+  	tools -.-> __end__;
+  	tools -.-> model;
+  	classDef default fill:#f2f0ff,line-height:1.2
+  	classDef first fill-opacity:0
+  	classDef last fill:#bfb6fc
+  
+  '''
+# ---
+# name: test_agent_graph_without_return_direct_tools
+  '''
+  ---
+  config:
+    flowchart:
+      curve: linear
+  ---
+  graph TD;
+  	__start__([<p>__start__</p>]):::first
+  	model(model)
+  	tools(tools)
+  	__end__([<p>__end__</p>]):::last
+  	__start__ --> model;
+  	model -.-> __end__;
+  	model -.-> tools;
+  	tools -.-> model;
+  	classDef default fill:#f2f0ff,line-height:1.2
+  	classDef first fill-opacity:0
+  	classDef last fill:#bfb6fc
+  
+  '''
+# ---

libs/langchain_v1/tests/unit_tests/agents/test_return_direct_graph.py

@@ -0,0 +1,73 @@
+"""Tests for return_direct tool graph structure."""
+
+from langchain_core.tools import tool
+from syrupy.assertion import SnapshotAssertion
+
+from langchain.agents.factory import create_agent
+
+from .model import FakeToolCallingModel
+
+
+def test_agent_graph_without_return_direct_tools(snapshot: SnapshotAssertion) -> None:
+    """Test that graph WITHOUT return_direct tools does NOT have edge from tools to end."""
+
+    @tool
+    def normal_tool(input_string: str) -> str:
+        """A normal tool without return_direct."""
+        return input_string
+
+    agent = create_agent(
+        model=FakeToolCallingModel(),
+        tools=[normal_tool],
+        system_prompt="You are a helpful assistant.",
+    )
+
+    # The mermaid diagram should NOT include an edge from tools to __end__
+    # when no tools have return_direct=True
+    mermaid_diagram = agent.get_graph().draw_mermaid()
+    assert mermaid_diagram == snapshot
+
+
+def test_agent_graph_with_return_direct_tool(snapshot: SnapshotAssertion) -> None:
+    """Test that graph WITH return_direct tools has correct edge from tools to end."""
+
+    @tool(return_direct=True)
+    def return_direct_tool(input_string: str) -> str:
+        """A tool with return_direct=True."""
+        return input_string
+
+    agent = create_agent(
+        model=FakeToolCallingModel(),
+        tools=[return_direct_tool],
+        system_prompt="You are a helpful assistant.",
+    )
+
+    # The mermaid diagram SHOULD include an edge from tools to __end__
+    # when at least one tool has return_direct=True
+    mermaid_diagram = agent.get_graph().draw_mermaid()
+    assert mermaid_diagram == snapshot
+
+
+def test_agent_graph_with_mixed_tools(snapshot: SnapshotAssertion) -> None:
+    """Test that graph with mixed tools (some return_direct, some not) has correct edges."""
+
+    @tool(return_direct=True)
+    def return_direct_tool(input_string: str) -> str:
+        """A tool with return_direct=True."""
+        return input_string
+
+    @tool
+    def normal_tool(input_string: str) -> str:
+        """A normal tool without return_direct."""
+        return input_string
+
+    agent = create_agent(
+        model=FakeToolCallingModel(),
+        tools=[return_direct_tool, normal_tool],
+        system_prompt="You are a helpful assistant.",
+    )
+
+    # The mermaid diagram SHOULD include an edge from tools to __end__
+    # because at least one tool has return_direct=True
+    mermaid_diagram = agent.get_graph().draw_mermaid()
+    assert mermaid_diagram == snapshot

libs/langchain_v1/uv.lock

@@ -1550,7 +1550,7 @@ wheels = [
 
 [[package]]
 name = "langchain"
-version = "1.0.0rc2"
+version = "1.0.0rc1"
 source = { editable = "." }
 dependencies = [
     { name = "langchain-core" },

libs/partners/huggingface/pyproject.toml

@@ -12,7 +12,7 @@ dependencies = [
     "huggingface-hub>=0.33.4,<1.0.0",
 ]
 name = "langchain-huggingface"
-version = "1.0.0a1"
+version = "0.3.1"
 description = "An integration package connecting Hugging Face and LangChain."
 readme = "README.md"
 

libs/partners/huggingface/uv.lock

@@ -904,7 +904,7 @@ wheels = [
 
 [[package]]
 name = "langchain-core"
-version = "1.0.0rc2"
+version = "1.0.0a5"
 source = { editable = "../../core" }
 dependencies = [
     { name = "jsonpatch" },
@@ -962,7 +962,7 @@ typing = [
 
 [[package]]
 name = "langchain-huggingface"
-version = "1.0.0a1"
+version = "0.3.1"
 source = { editable = "." }
 dependencies = [
     { name = "huggingface-hub" },
@@ -1040,7 +1040,7 @@ typing = [
 
 [[package]]
 name = "langchain-tests"
-version = "1.0.0rc1"
+version = "1.0.0a1"
 source = { editable = "../../standard-tests" }
 dependencies = [
     { name = "httpx" },