diff --git a/libs/langchain_v1/langchain/agents/middleware/human_in_the_loop.py b/libs/langchain_v1/langchain/agents/middleware/human_in_the_loop.py
index 86bf75c71f31a..49ad5d00d66e4 100644
--- a/libs/langchain_v1/langchain/agents/middleware/human_in_the_loop.py
+++ b/libs/langchain_v1/langchain/agents/middleware/human_in_the_loop.py
@@ -112,14 +112,14 @@ class HumanInTheLoopMiddleware(AgentMiddleware):
 
     def __init__(
         self,
-        tool_configs: dict[str, bool | ToolConfig],
+        interrupt_on: dict[str, bool | ToolConfig],
         *,
         description_prefix: str = "Tool execution requires approval",
     ) -> None:
         """Initialize the human in the loop middleware.
 
         Args:
-            tool_configs: Mapping of tool name to allowed actions.
+            interrupt_on: Mapping of tool name to allowed actions.
                 If a tool doesn't have an entry, it's auto-approved by default.
                 * `True` indicates all actions are allowed: accept, edit, and respond.
                 * `False` indicates that the tool is auto-approved.
@@ -130,7 +130,7 @@ def __init__(
         """
         super().__init__()
         resolved_tool_configs: dict[str, ToolConfig] = {}
-        for tool_name, tool_config in tool_configs.items():
+        for tool_name, tool_config in interrupt_on.items():
             if isinstance(tool_config, bool):
                 if tool_config is True:
                     resolved_tool_configs[tool_name] = ToolConfig(
@@ -142,11 +142,11 @@ def __init__(
                 tool_config.get(x, False) for x in ["allow_accept", "allow_edit", "allow_respond"]
             ):
                 resolved_tool_configs[tool_name] = tool_config
-        self.tool_configs = resolved_tool_configs
+        self.interrupt_on = resolved_tool_configs
         self.description_prefix = description_prefix
 
     def after_model(self, state: AgentState) -> dict[str, Any] | None:  # type: ignore[override]
-        """Trigger HITL flows for relevant tool calls after an AIMessage."""
+        """Trigger interrupt flows for relevant tool calls after an AIMessage."""
         messages = state["messages"]
         if not messages:
             return None
@@ -156,16 +156,16 @@ def after_model(self, state: AgentState) -> dict[str, Any] | None:  # type: igno
             return None
 
         # Separate tool calls that need interrupts from those that don't
-        hitl_tool_calls: list[ToolCall] = []
+        interrupt_tool_calls: list[ToolCall] = []
         auto_approved_tool_calls = []
 
         for tool_call in last_ai_msg.tool_calls:
-            hitl_tool_calls.append(tool_call) if tool_call[
+            interrupt_tool_calls.append(tool_call) if tool_call[
                 "name"
-            ] in self.tool_configs else auto_approved_tool_calls.append(tool_call)
+            ] in self.interrupt_on else auto_approved_tool_calls.append(tool_call)
 
         # If no interrupts needed, return early
-        if not hitl_tool_calls:
+        if not interrupt_tool_calls:
             return None
 
         # Process all tool calls that require interrupts
@@ -173,11 +173,11 @@ def after_model(self, state: AgentState) -> dict[str, Any] | None:  # type: igno
         artificial_tool_messages: list[ToolMessage] = []
 
         # Create interrupt requests for all tools that need approval
-        hitl_requests: list[HumanInTheLoopRequest] = []
-        for tool_call in hitl_tool_calls:
+        interrupt_requests: list[HumanInTheLoopRequest] = []
+        for tool_call in interrupt_tool_calls:
             tool_name = tool_call["name"]
             tool_args = tool_call["args"]
-            config = self.tool_configs[tool_name]
+            config = self.interrupt_on[tool_name]
             description = (
                 config.get("description")
                 or f"{self.description_prefix}\n\nTool: {tool_name}\nArgs: {tool_args}"
@@ -191,21 +191,23 @@ def after_model(self, state: AgentState) -> dict[str, Any] | None:  # type: igno
                 "config": config,
                 "description": description,
             }
-            hitl_requests.append(request)
+            interrupt_requests.append(request)
 
-        responses: list[HumanInTheLoopResponse] = interrupt(hitl_requests)
+        responses: list[HumanInTheLoopResponse] = interrupt(interrupt_requests)
 
         # Validate that the number of responses matches the number of interrupt tool calls
-        if (responses_len := len(responses)) != (hitl_tool_calls_len := len(hitl_tool_calls)):
+        if (responses_len := len(responses)) != (
+            interrupt_tool_calls_len := len(interrupt_tool_calls)
+        ):
             msg = (
                 f"Number of human responses ({responses_len}) does not match "
-                f"number of hanging tool calls ({hitl_tool_calls_len})."
+                f"number of hanging tool calls ({interrupt_tool_calls_len})."
             )
             raise ValueError(msg)
 
         for i, response in enumerate(responses):
-            tool_call = hitl_tool_calls[i]
-            config = self.tool_configs[tool_call["name"]]
+            tool_call = interrupt_tool_calls[i]
+            config = self.interrupt_on[tool_call["name"]]
 
             if response["type"] == "accept" and config.get("allow_accept"):
                 approved_tool_calls.append(tool_call)
diff --git a/libs/langchain_v1/tests/unit_tests/agents/test_middleware_agent.py b/libs/langchain_v1/tests/unit_tests/agents/test_middleware_agent.py
index f2c42bb34672e..5953ba8d1ae2f 100644
--- a/libs/langchain_v1/tests/unit_tests/agents/test_middleware_agent.py
+++ b/libs/langchain_v1/tests/unit_tests/agents/test_middleware_agent.py
@@ -372,13 +372,13 @@ def test_human_in_the_loop_middleware_initialization() -> None:
     """Test HumanInTheLoopMiddleware initialization."""
 
     middleware = HumanInTheLoopMiddleware(
-        tool_configs={
+        interrupt_on={
             "test_tool": {"allow_accept": True, "allow_edit": True, "allow_respond": True}
         },
         description_prefix="Custom prefix",
     )
 
-    assert middleware.tool_configs == {
+    assert middleware.interrupt_on == {
         "test_tool": {"allow_accept": True, "allow_edit": True, "allow_respond": True}
     }
     assert middleware.description_prefix == "Custom prefix"
@@ -388,7 +388,7 @@ def test_human_in_the_loop_middleware_no_interrupts_needed() -> None:
     """Test HumanInTheLoopMiddleware when no interrupts are needed."""
 
     middleware = HumanInTheLoopMiddleware(
-        tool_configs={
+        interrupt_on={
             "test_tool": {"allow_respond": True, "allow_edit": True, "allow_accept": True}
         }
     )
@@ -417,7 +417,7 @@ def test_human_in_the_loop_middleware_single_tool_accept() -> None:
     """Test HumanInTheLoopMiddleware with single tool accept response."""
 
     middleware = HumanInTheLoopMiddleware(
-        tool_configs={
+        interrupt_on={
             "test_tool": {"allow_respond": True, "allow_edit": True, "allow_accept": True}
         }
     )
@@ -452,7 +452,7 @@ def mock_accept(requests):
 def test_human_in_the_loop_middleware_single_tool_edit() -> None:
     """Test HumanInTheLoopMiddleware with single tool edit response."""
     middleware = HumanInTheLoopMiddleware(
-        tool_configs={
+        interrupt_on={
             "test_tool": {"allow_respond": True, "allow_edit": True, "allow_accept": True}
         }
     )
@@ -487,7 +487,7 @@ def test_human_in_the_loop_middleware_single_tool_response() -> None:
     """Test HumanInTheLoopMiddleware with single tool response with custom message."""
 
     middleware = HumanInTheLoopMiddleware(
-        tool_configs={
+        interrupt_on={
             "test_tool": {"allow_respond": True, "allow_edit": True, "allow_accept": True}
         }
     )
@@ -518,7 +518,7 @@ def test_human_in_the_loop_middleware_multiple_tools_mixed_responses() -> None:
     """Test HumanInTheLoopMiddleware with multiple tools and mixed response types."""
 
     middleware = HumanInTheLoopMiddleware(
-        tool_configs={
+        interrupt_on={
             "get_forecast": {"allow_accept": True, "allow_edit": True, "allow_respond": True},
             "get_temperature": {"allow_accept": True, "allow_edit": True, "allow_respond": True},
         }
@@ -565,7 +565,7 @@ def test_human_in_the_loop_middleware_multiple_tools_edit_responses() -> None:
     """Test HumanInTheLoopMiddleware with multiple tools and edit responses."""
 
     middleware = HumanInTheLoopMiddleware(
-        tool_configs={
+        interrupt_on={
             "get_forecast": {"allow_accept": True, "allow_edit": True, "allow_respond": True},
             "get_temperature": {"allow_accept": True, "allow_edit": True, "allow_respond": True},
         }
@@ -617,7 +617,7 @@ def test_human_in_the_loop_middleware_edit_with_modified_args() -> None:
     """Test HumanInTheLoopMiddleware with edit action that includes modified args."""
 
     middleware = HumanInTheLoopMiddleware(
-        tool_configs={
+        interrupt_on={
             "test_tool": {"allow_accept": True, "allow_edit": True, "allow_respond": True}
         }
     )
@@ -657,7 +657,7 @@ def mock_edit_with_args(requests):
 def test_human_in_the_loop_middleware_unknown_response_type() -> None:
     """Test HumanInTheLoopMiddleware with unknown response type."""
     middleware = HumanInTheLoopMiddleware(
-        tool_configs={
+        interrupt_on={
             "test_tool": {"allow_accept": True, "allow_edit": True, "allow_respond": True}
         }
     )
@@ -684,7 +684,7 @@ def test_human_in_the_loop_middleware_disallowed_action() -> None:
 
     # edit is not allowed by tool config
     middleware = HumanInTheLoopMiddleware(
-        tool_configs={
+        interrupt_on={
             "test_tool": {"allow_respond": True, "allow_edit": False, "allow_accept": True}
         }
     )
@@ -721,7 +721,7 @@ def test_human_in_the_loop_middleware_mixed_auto_approved_and_interrupt() -> Non
     """Test HumanInTheLoopMiddleware with mix of auto-approved and interrupt tools."""
 
     middleware = HumanInTheLoopMiddleware(
-        tool_configs={
+        interrupt_on={
             "interrupt_tool": {"allow_respond": True, "allow_edit": True, "allow_accept": True}
         }
     )
@@ -755,7 +755,7 @@ def test_human_in_the_loop_middleware_interrupt_request_structure() -> None:
     """Test that interrupt requests are structured correctly."""
 
     middleware = HumanInTheLoopMiddleware(
-        tool_configs={
+        interrupt_on={
             "test_tool": {"allow_accept": True, "allow_edit": True, "allow_respond": True}
         },
         description_prefix="Custom prefix",
@@ -796,7 +796,7 @@ def mock_capture_requests(requests):
 
 def test_human_in_the_loop_middleware_boolean_configs() -> None:
     """Test HITL middleware with boolean tool configs."""
-    middleware = HumanInTheLoopMiddleware(tool_configs={"test_tool": True})
+    middleware = HumanInTheLoopMiddleware(interrupt_on={"test_tool": True})
 
     ai_message = AIMessage(
         content="I'll help you",
@@ -834,7 +834,7 @@ def test_human_in_the_loop_middleware_boolean_configs() -> None:
         assert len(result["messages"]) == 1
         assert result["messages"][0].tool_calls[0]["args"] == {"input": "edited"}
 
-    middleware = HumanInTheLoopMiddleware(tool_configs={"test_tool": False})
+    middleware = HumanInTheLoopMiddleware(interrupt_on={"test_tool": False})
 
     result = middleware.after_model(state)
     # No interruption should occur
@@ -843,7 +843,7 @@ def test_human_in_the_loop_middleware_boolean_configs() -> None:
 
 def test_human_in_the_loop_middleware_sequence_mismatch() -> None:
     """Test that sequence mismatch in resume raises an error."""
-    middleware = HumanInTheLoopMiddleware(tool_configs={"test_tool": True})
+    middleware = HumanInTheLoopMiddleware(interrupt_on={"test_tool": True})
 
     ai_message = AIMessage(
         content="I'll help you",