fix: circular import

JoshParkSJ · JoshParkSJ · commit 115bcfd5ba0b · 2026-03-16T09:34:11.000-04:00
diff --git a/src/uipath_langchain/chat/hitl.py b/src/uipath_langchain/chat/hitl.py
@@ -12,8 +12,6 @@
     UiPathConversationToolCallConfirmationValue,
 )
 
-from uipath_langchain.agent.tools.durable_interrupt import add_interrupt_offset
-
 CANCELLED_MESSAGE = "Cancelled by user"
 
 CONVERSATIONAL_APPROVED_TOOL_ARGS = "conversational_approved_tool_args"
@@ -129,6 +127,10 @@ def request_approval(
             input_value=tool_args,
         )
     )
+    # Lazy import to avoid circular dependency:
+    # hitl -> agent.tools.durable_interrupt -> agent.tools -> tool_node -> hitl
+    from uipath_langchain.agent.tools.durable_interrupt import add_interrupt_offset
+
     # Workaround for langgraph#6792 — remove when subgraph @task + interrupt()
     # checkpoint caching is fixed upstream
     add_interrupt_offset()

Original file line number	Diff line number	Diff line change
`@@ -12,8 +12,6 @@`
`12`	`12`	`UiPathConversationToolCallConfirmationValue,`
`13`	`13`	`)`
`14`	`14`
`15`		`-from uipath_langchain.agent.tools.durable_interrupt import add_interrupt_offset`
`16`		`-`
`17`	`15`	`CANCELLED_MESSAGE = "Cancelled by user"`
`18`	`16`
`19`	`17`	`CONVERSATIONAL_APPROVED_TOOL_ARGS = "conversational_approved_tool_args"`
`@@ -129,6 +127,10 @@ def request_approval(`
`129`	`127`	`input_value=tool_args,`
`130`	`128`	`)`
`131`	`129`	`)`
	`130`	`+ # Lazy import to avoid circular dependency:`
	`131`	`+ # hitl -> agent.tools.durable_interrupt -> agent.tools -> tool_node -> hitl`
	`132`	`+ from uipath_langchain.agent.tools.durable_interrupt import add_interrupt_offset`
	`133`	`+`
`132`	`134`	`# Workaround for langgraph#6792 — remove when subgraph @task + interrupt()`
`133`	`135`	`# checkpoint caching is fixed upstream`
`134`	`136`	`add_interrupt_offset()`