diff --git a/libs/langgraph/langgraph/graph/graph.py b/libs/langgraph/langgraph/graph/graph.py
index ba2c8df72..137eb0862 100644
--- a/libs/langgraph/langgraph/graph/graph.py
+++ b/libs/langgraph/langgraph/graph/graph.py
@@ -472,7 +472,7 @@ class CompiledGraph(Pregel):
                 )
                 subgraph.trim_first_node()
                 subgraph.trim_last_node()
-                if len(subgraph.nodes) > 1:
+                if len(subgraph.nodes) >= 1:
                     e, s = graph.extend(subgraph, prefix=key)
                     if e is None:
                         raise ValueError(
diff --git a/libs/langgraph/poetry.lock b/libs/langgraph/poetry.lock
index c75b9f6f7..ef04df931 100644
--- a/libs/langgraph/poetry.lock
+++ b/libs/langgraph/poetry.lock
@@ -1324,19 +1324,19 @@ files = [
 
 [[package]]
 name = "langchain-core"
-version = "0.3.30"
+version = "0.3.44"
 description = "Building applications with LLMs through composability"
 optional = false
 python-versions = "<4.0,>=3.9"
 groups = ["main", "dev"]
 files = [
-    {file = "langchain_core-0.3.30-py3-none-any.whl", hash = "sha256:0a4c4e02fac5968b67fbb0142c00c2b976c97e45fce62c7ac9eb1636a6926493"},
-    {file = "langchain_core-0.3.30.tar.gz", hash = "sha256:0f1281b4416977df43baf366633ad18e96c5dcaaeae6fcb8a799f9889c853243"},
+    {file = "langchain_core-0.3.44-py3-none-any.whl", hash = "sha256:d989ce8bd62f1d07765acd575e6ec1254aec0cf7775aaea39fe4af8102377459"},
+    {file = "langchain_core-0.3.44.tar.gz", hash = "sha256:7c0a01e78360f007cbca448178fe7e032404068e6431dbe8ce905f84febbdfa5"},
 ]
 
 [package.dependencies]
 jsonpatch = ">=1.33,<2.0"
-langsmith = ">=0.1.125,<0.3"
+langsmith = ">=0.1.125,<0.4"
 packaging = ">=23.2,<25"
 pydantic = [
     {version = ">=2.5.2,<3.0.0", markers = "python_full_version < \"3.12.4\""},
@@ -1348,7 +1348,7 @@ typing-extensions = ">=4.7"
 
 [[package]]
 name = "langgraph-checkpoint"
-version = "2.0.16"
+version = "2.0.18"
 description = "Library with base interfaces for LangGraph checkpoint savers."
 optional = false
 python-versions = "^3.9.0,<4.0"
@@ -1366,7 +1366,7 @@ url = "../checkpoint"
 
 [[package]]
 name = "langgraph-checkpoint-postgres"
-version = "2.0.15"
+version = "2.0.16"
 description = "Library with a Postgres implementation of LangGraph checkpoint saver."
 optional = false
 python-versions = "^3.9.0,<4.0"
@@ -1386,7 +1386,7 @@ url = "../checkpoint-postgres"
 
 [[package]]
 name = "langgraph-checkpoint-sqlite"
-version = "2.0.5"
+version = "2.0.6"
 description = "Library with a SQLite implementation of LangGraph checkpoint saver."
 optional = false
 python-versions = "^3.9.0"
@@ -1404,7 +1404,7 @@ url = "../checkpoint-sqlite"
 
 [[package]]
 name = "langgraph-prebuilt"
-version = "0.1.1"
+version = "0.1.2"
 description = "Library with high-level APIs for creating and executing LangGraph agents and tools."
 optional = false
 python-versions = "^3.9.0,<4.0"
@@ -1422,7 +1422,7 @@ url = "../prebuilt"
 
 [[package]]
 name = "langgraph-sdk"
-version = "0.1.53"
+version = "0.1.55"
 description = "SDK for interacting with LangGraph API"
 optional = false
 python-versions = "^3.9.0,<4.0"
diff --git a/libs/langgraph/tests/__snapshots__/test_large_cases.ambr b/libs/langgraph/tests/__snapshots__/test_large_cases.ambr
index 017b1aa9b..62517bcb7 100644
--- a/libs/langgraph/tests/__snapshots__/test_large_cases.ambr
+++ b/libs/langgraph/tests/__snapshots__/test_large_cases.ambr
@@ -3116,8 +3116,6 @@
   	__start__([<p>__start__</p>]):::first
   	router_node(router_node)
   	normal_llm_node(normal_llm_node)
-  	weather_graph_model_node(model_node)
-  	weather_graph_weather_node(weather_node<hr/><small><em>__interrupt = before</em></small>)
   	__end__([<p>__end__</p>]):::last
   	__start__ --> router_node;
   	normal_llm_node --> __end__;
@@ -3126,6 +3124,8 @@
   	router_node -.-> weather_graph_model_node;
   	router_node -.-> __end__;
   	subgraph weather_graph
+  	weather_graph_model_node(model_node)
+  	weather_graph_weather_node(weather_node<hr/><small><em>__interrupt = before</em></small>)
   	weather_graph_model_node --> weather_graph_weather_node;
   	end
   	classDef default fill:#f2f0ff,line-height:1.2
@@ -3141,8 +3141,6 @@
   	__start__([<p>__start__</p>]):::first
   	router_node(router_node)
   	normal_llm_node(normal_llm_node)
-  	weather_graph_model_node(model_node)
-  	weather_graph_weather_node(weather_node<hr/><small><em>__interrupt = before</em></small>)
   	__end__([<p>__end__</p>]):::last
   	__start__ --> router_node;
   	normal_llm_node --> __end__;
@@ -3151,6 +3149,8 @@
   	router_node -.-> weather_graph_model_node;
   	router_node -.-> __end__;
   	subgraph weather_graph
+  	weather_graph_model_node(model_node)
+  	weather_graph_weather_node(weather_node<hr/><small><em>__interrupt = before</em></small>)
   	weather_graph_model_node --> weather_graph_weather_node;
   	end
   	classDef default fill:#f2f0ff,line-height:1.2
@@ -3166,8 +3166,6 @@
   	__start__([<p>__start__</p>]):::first
   	router_node(router_node)
   	normal_llm_node(normal_llm_node)
-  	weather_graph_model_node(model_node)
-  	weather_graph_weather_node(weather_node<hr/><small><em>__interrupt = before</em></small>)
   	__end__([<p>__end__</p>]):::last
   	__start__ --> router_node;
   	normal_llm_node --> __end__;
@@ -3176,6 +3174,8 @@
   	router_node -.-> weather_graph_model_node;
   	router_node -.-> __end__;
   	subgraph weather_graph
+  	weather_graph_model_node(model_node)
+  	weather_graph_weather_node(weather_node<hr/><small><em>__interrupt = before</em></small>)
   	weather_graph_model_node --> weather_graph_weather_node;
   	end
   	classDef default fill:#f2f0ff,line-height:1.2
@@ -3191,8 +3191,6 @@
   	__start__([<p>__start__</p>]):::first
   	router_node(router_node)
   	normal_llm_node(normal_llm_node)
-  	weather_graph_model_node(model_node)
-  	weather_graph_weather_node(weather_node<hr/><small><em>__interrupt = before</em></small>)
   	__end__([<p>__end__</p>]):::last
   	__start__ --> router_node;
   	normal_llm_node --> __end__;
@@ -3201,6 +3199,8 @@
   	router_node -.-> weather_graph_model_node;
   	router_node -.-> __end__;
   	subgraph weather_graph
+  	weather_graph_model_node(model_node)
+  	weather_graph_weather_node(weather_node<hr/><small><em>__interrupt = before</em></small>)
   	weather_graph_model_node --> weather_graph_weather_node;
   	end
   	classDef default fill:#f2f0ff,line-height:1.2
@@ -3216,8 +3216,6 @@
   	__start__([<p>__start__</p>]):::first
   	router_node(router_node)
   	normal_llm_node(normal_llm_node)
-  	weather_graph_model_node(model_node)
-  	weather_graph_weather_node(weather_node<hr/><small><em>__interrupt = before</em></small>)
   	__end__([<p>__end__</p>]):::last
   	__start__ --> router_node;
   	normal_llm_node --> __end__;
@@ -3226,6 +3224,8 @@
   	router_node -.-> weather_graph_model_node;
   	router_node -.-> __end__;
   	subgraph weather_graph
+  	weather_graph_model_node(model_node)
+  	weather_graph_weather_node(weather_node<hr/><small><em>__interrupt = before</em></small>)
   	weather_graph_model_node --> weather_graph_weather_node;
   	end
   	classDef default fill:#f2f0ff,line-height:1.2
@@ -3241,8 +3241,6 @@
   	__start__([<p>__start__</p>]):::first
   	router_node(router_node)
   	normal_llm_node(normal_llm_node)
-  	weather_graph_model_node(model_node)
-  	weather_graph_weather_node(weather_node<hr/><small><em>__interrupt = before</em></small>)
   	__end__([<p>__end__</p>]):::last
   	__start__ --> router_node;
   	normal_llm_node --> __end__;
@@ -3251,6 +3249,8 @@
   	router_node -.-> weather_graph_model_node;
   	router_node -.-> __end__;
   	subgraph weather_graph
+  	weather_graph_model_node(model_node)
+  	weather_graph_weather_node(weather_node<hr/><small><em>__interrupt = before</em></small>)
   	weather_graph_model_node --> weather_graph_weather_node;
   	end
   	classDef default fill:#f2f0ff,line-height:1.2
diff --git a/libs/langgraph/tests/__snapshots__/test_large_cases_async.ambr b/libs/langgraph/tests/__snapshots__/test_large_cases_async.ambr
index 898dd4f89..107532c66 100644
--- a/libs/langgraph/tests/__snapshots__/test_large_cases_async.ambr
+++ b/libs/langgraph/tests/__snapshots__/test_large_cases_async.ambr
@@ -6,8 +6,6 @@
   	__start__([<p>__start__</p>]):::first
   	router_node(router_node)
   	normal_llm_node(normal_llm_node)
-  	weather_graph_model_node(model_node)
-  	weather_graph_weather_node(weather_node<hr/><small><em>__interrupt = before</em></small>)
   	__end__([<p>__end__</p>]):::last
   	__start__ --> router_node;
   	normal_llm_node --> __end__;
@@ -16,6 +14,8 @@
   	router_node -.-> weather_graph_model_node;
   	router_node -.-> __end__;
   	subgraph weather_graph
+  	weather_graph_model_node(model_node)
+  	weather_graph_weather_node(weather_node<hr/><small><em>__interrupt = before</em></small>)
   	weather_graph_model_node --> weather_graph_weather_node;
   	end
   	classDef default fill:#f2f0ff,line-height:1.2
@@ -31,8 +31,6 @@
   	__start__([<p>__start__</p>]):::first
   	router_node(router_node)
   	normal_llm_node(normal_llm_node)
-  	weather_graph_model_node(model_node)
-  	weather_graph_weather_node(weather_node<hr/><small><em>__interrupt = before</em></small>)
   	__end__([<p>__end__</p>]):::last
   	__start__ --> router_node;
   	normal_llm_node --> __end__;
@@ -41,6 +39,8 @@
   	router_node -.-> weather_graph_model_node;
   	router_node -.-> __end__;
   	subgraph weather_graph
+  	weather_graph_model_node(model_node)
+  	weather_graph_weather_node(weather_node<hr/><small><em>__interrupt = before</em></small>)
   	weather_graph_model_node --> weather_graph_weather_node;
   	end
   	classDef default fill:#f2f0ff,line-height:1.2
@@ -56,8 +56,6 @@
   	__start__([<p>__start__</p>]):::first
   	router_node(router_node)
   	normal_llm_node(normal_llm_node)
-  	weather_graph_model_node(model_node)
-  	weather_graph_weather_node(weather_node<hr/><small><em>__interrupt = before</em></small>)
   	__end__([<p>__end__</p>]):::last
   	__start__ --> router_node;
   	normal_llm_node --> __end__;
@@ -66,6 +64,8 @@
   	router_node -.-> weather_graph_model_node;
   	router_node -.-> __end__;
   	subgraph weather_graph
+  	weather_graph_model_node(model_node)
+  	weather_graph_weather_node(weather_node<hr/><small><em>__interrupt = before</em></small>)
   	weather_graph_model_node --> weather_graph_weather_node;
   	end
   	classDef default fill:#f2f0ff,line-height:1.2
@@ -81,8 +81,6 @@
   	__start__([<p>__start__</p>]):::first
   	router_node(router_node)
   	normal_llm_node(normal_llm_node)
-  	weather_graph_model_node(model_node)
-  	weather_graph_weather_node(weather_node<hr/><small><em>__interrupt = before</em></small>)
   	__end__([<p>__end__</p>]):::last
   	__start__ --> router_node;
   	normal_llm_node --> __end__;
@@ -91,6 +89,8 @@
   	router_node -.-> weather_graph_model_node;
   	router_node -.-> __end__;
   	subgraph weather_graph
+  	weather_graph_model_node(model_node)
+  	weather_graph_weather_node(weather_node<hr/><small><em>__interrupt = before</em></small>)
   	weather_graph_model_node --> weather_graph_weather_node;
   	end
   	classDef default fill:#f2f0ff,line-height:1.2
@@ -106,8 +106,6 @@
   	__start__([<p>__start__</p>]):::first
   	router_node(router_node)
   	normal_llm_node(normal_llm_node)
-  	weather_graph_model_node(model_node)
-  	weather_graph_weather_node(weather_node<hr/><small><em>__interrupt = before</em></small>)
   	__end__([<p>__end__</p>]):::last
   	__start__ --> router_node;
   	normal_llm_node --> __end__;
@@ -116,6 +114,8 @@
   	router_node -.-> weather_graph_model_node;
   	router_node -.-> __end__;
   	subgraph weather_graph
+  	weather_graph_model_node(model_node)
+  	weather_graph_weather_node(weather_node<hr/><small><em>__interrupt = before</em></small>)
   	weather_graph_model_node --> weather_graph_weather_node;
   	end
   	classDef default fill:#f2f0ff,line-height:1.2
@@ -131,8 +131,6 @@
   	__start__([<p>__start__</p>]):::first
   	router_node(router_node)
   	normal_llm_node(normal_llm_node)
-  	weather_graph_model_node(model_node)
-  	weather_graph_weather_node(weather_node<hr/><small><em>__interrupt = before</em></small>)
   	__end__([<p>__end__</p>]):::last
   	__start__ --> router_node;
   	normal_llm_node --> __end__;
@@ -141,6 +139,8 @@
   	router_node -.-> weather_graph_model_node;
   	router_node -.-> __end__;
   	subgraph weather_graph
+  	weather_graph_model_node(model_node)
+  	weather_graph_weather_node(weather_node<hr/><small><em>__interrupt = before</em></small>)
   	weather_graph_model_node --> weather_graph_weather_node;
   	end
   	classDef default fill:#f2f0ff,line-height:1.2
diff --git a/libs/langgraph/tests/__snapshots__/test_pregel.ambr b/libs/langgraph/tests/__snapshots__/test_pregel.ambr
index b54324b06..c751b924f 100644
--- a/libs/langgraph/tests/__snapshots__/test_pregel.ambr
+++ b/libs/langgraph/tests/__snapshots__/test_pregel.ambr
@@ -1722,13 +1722,13 @@
   	__start__([<p>__start__</p>]):::first
   	uno(uno)
   	dos(dos)
-  	subgraph_one(one)
-  	subgraph_two(two)
-  	subgraph_three(three)
   	__start__ --> uno;
   	uno -.-> dos;
   	uno -.-> subgraph_one;
   	subgraph subgraph
+  	subgraph_one(one)
+  	subgraph_two(two)
+  	subgraph_three(three)
   	subgraph_one -.-> subgraph_two;
   	subgraph_one -.-> subgraph_three;
   	end
@@ -1752,12 +1752,14 @@
   %%{init: {'flowchart': {'curve': 'linear'}}}%%
   graph TD;
   	__start__([<p>__start__</p>]):::first
-  	inner(inner)
   	side(side)
   	__end__([<p>__end__</p>]):::last
-  	__start__ --> inner;
-  	inner --> side;
+  	__start__ --> inner_up;
+  	inner_up --> side;
   	side --> __end__;
+  	subgraph inner
+  	inner_up(up)
+  	end
   	classDef default fill:#f2f0ff,line-height:1.2
   	classDef first fill-opacity:0
   	classDef last fill:#bfb6fc
@@ -1895,10 +1897,6 @@
   graph TD;
   	__start__([<p>__start__</p>]):::first
   	tool_one(tool_one)
-  	tool_two___start__(<p>__start__</p>)
-  	tool_two_tool_two_slow(tool_two_slow)
-  	tool_two_tool_two_fast(tool_two_fast)
-  	tool_two___end__(<p>__end__</p>)
   	tool_three(tool_three)
   	__end__([<p>__end__</p>]):::last
   	__start__ -.-> tool_one;
@@ -1908,6 +1906,10 @@
   	__start__ -.-> tool_three;
   	tool_three --> __end__;
   	subgraph tool_two
+  	tool_two___start__(<p>__start__</p>)
+  	tool_two_tool_two_slow(tool_two_slow)
+  	tool_two_tool_two_fast(tool_two_fast)
+  	tool_two___end__(<p>__end__</p>)
   	tool_two___start__ -.-> tool_two_tool_two_slow;
   	tool_two_tool_two_slow --> tool_two___end__;
   	tool_two___start__ -.-> tool_two_tool_two_fast;
@@ -1962,24 +1964,24 @@
   graph TD;
   	__start__([<p>__start__</p>]):::first
   	gp_one(gp_one)
-  	gp_two___start__(<p>__start__</p>)
-  	gp_two_p_one(p_one)
-  	gp_two_p_two___start__(<p>__start__</p>)
-  	gp_two_p_two_c_one(c_one)
-  	gp_two_p_two_c_two(c_two)
-  	gp_two_p_two___end__(<p>__end__</p>)
-  	gp_two___end__(<p>__end__</p>)
   	__end__([<p>__end__</p>]):::last
   	__start__ --> gp_one;
   	gp_two___end__ --> gp_one;
   	gp_one -. &nbsp;0&nbsp; .-> gp_two___start__;
   	gp_one -. &nbsp;1&nbsp; .-> __end__;
   	subgraph gp_two
+  	gp_two___start__(<p>__start__</p>)
+  	gp_two_p_one(p_one)
+  	gp_two___end__(<p>__end__</p>)
   	gp_two___start__ --> gp_two_p_one;
   	gp_two_p_two___end__ --> gp_two_p_one;
   	gp_two_p_one -. &nbsp;0&nbsp; .-> gp_two_p_two___start__;
   	gp_two_p_one -. &nbsp;1&nbsp; .-> gp_two___end__;
   	subgraph p_two
+  	gp_two_p_two___start__(<p>__start__</p>)
+  	gp_two_p_two_c_one(c_one)
+  	gp_two_p_two_c_two(c_two)
+  	gp_two_p_two___end__(<p>__end__</p>)
   	gp_two_p_two___start__ --> gp_two_p_two_c_one;
   	gp_two_p_two_c_two --> gp_two_p_two_c_one;
   	gp_two_p_two_c_one -. &nbsp;0&nbsp; .-> gp_two_p_two_c_two;
@@ -1998,16 +2000,16 @@
   graph TD;
   	__start__([<p>__start__</p>]):::first
   	p_one(p_one)
-  	p_two___start__(<p>__start__</p>)
-  	p_two_c_one(c_one)
-  	p_two_c_two(c_two)
-  	p_two___end__(<p>__end__</p>)
   	__end__([<p>__end__</p>]):::last
   	__start__ --> p_one;
   	p_two___end__ --> p_one;
   	p_one -. &nbsp;0&nbsp; .-> p_two___start__;
   	p_one -. &nbsp;1&nbsp; .-> __end__;
   	subgraph p_two
+  	p_two___start__(<p>__start__</p>)
+  	p_two_c_one(c_one)
+  	p_two_c_two(c_two)
+  	p_two___end__(<p>__end__</p>)
   	p_two___start__ --> p_two_c_one;
   	p_two_c_two --> p_two_c_one;
   	p_two_c_one -. &nbsp;0&nbsp; .-> p_two_c_two;