python[patch]: call create_react_agent model node without is_last_step (#3114)

So that you can call agent.nodes['agent'].invoke({'messages': []})
without needing to specify is_last_step. very helpful for evaluating
just the model node of the agent

libs/langgraph/langgraph/prebuilt/chat_agent_executor.py

@@ -635,7 +635,7 @@ def create_react_agent(
         if (
             (
                 "remaining_steps" not in state
-                and state["is_last_step"]
+                and state.get("is_last_step", False)
                 and has_tool_calls
             )
             or (
@@ -672,7 +672,7 @@ def create_react_agent(
         if (
             (
                 "remaining_steps" not in state
-                and state["is_last_step"]
+                and state.get("is_last_step", False)
                 and has_tool_calls
             )
             or (

libs/langgraph/pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "langgraph"
-version = "0.2.64"
+version = "0.2.65"
 description = "Building stateful, multi-actor applications with LLMs"
 authors = []
 license = "MIT"