diff --git a/splunklib/ai/engines/langchain.py b/splunklib/ai/engines/langchain.py
index b53d1cd7..93a13527 100644
--- a/splunklib/ai/engines/langchain.py
+++ b/splunklib/ai/engines/langchain.py
@@ -485,6 +485,7 @@ def unpack_tool_call(self, call: LC_ToolCall) -> LC_ToolCall:
                         id=call["id"],
                         name=call["name"],
                         args=unpacked_args,
+                        type="tool_call",
                     )
 
                 return call
@@ -1142,6 +1143,7 @@ def _convert_model_response_to_model_result(
                 id=call.id,
                 name=f"{TOOL_STRATEGY_TOOL_PREFIX}{call.name}",
                 args=call.args,
+                type="tool_call",
             )
             for call in resp.message.structured_output_calls
         )
@@ -1646,7 +1648,7 @@ def _map_tool_call_to_langchain(call: ToolCall | SubagentCall) -> LC_ToolCall:
             name = _normalize_tool_name(call.name, call.type)
             args = call.args
 
-    return LC_ToolCall(id=call.id, name=name, args=args)
+    return LC_ToolCall(id=call.id, name=name, args=args, type="tool_call")
 
 
 def _map_content_from_langchain(
@@ -1754,6 +1756,7 @@ def _map_message_to_langchain(message: BaseMessage) -> LC_AnyMessage:
                     id=call.id,
                     name=f"{TOOL_STRATEGY_TOOL_PREFIX}{call.name}",
                     args=call.args,
+                    type="tool_call",
                 )
                 for call in message.structured_output_calls
             )
diff --git a/tests/unit/ai/engine/test_langchain_backend.py b/tests/unit/ai/engine/test_langchain_backend.py
index 1daa0add..450fd7f4 100644
--- a/tests/unit/ai/engine/test_langchain_backend.py
+++ b/tests/unit/ai/engine/test_langchain_backend.py
@@ -184,6 +184,7 @@ def test_map_message_from_langchain_ai_with_agent_call(self) -> None:
             name=f"{lc.AGENT_PREFIX}assistant",
             args={"args": {"q": "test"}, "thread_id": None},
             id="tc-2",
+            type="tool_call",
         )
         message = LC_AIMessage(content="done", tool_calls=[tool_call])
         mapped = lc._map_message_from_langchain(message)
@@ -199,11 +200,14 @@ def test_map_message_from_langchain_ai_with_agent_call(self) -> None:
         ]
 
     def test_map_message_from_langchain_ai_with_mixed_calls(self) -> None:
-        tool_call = LC_ToolCall(name="lookup", args={"q": "test"}, id="tc-1")
+        tool_call = LC_ToolCall(
+            name="lookup", args={"q": "test"}, id="tc-1", type="tool_call"
+        )
         agent_call = LC_ToolCall(
             name=f"{lc.AGENT_PREFIX}assistant",
             args={"args": {"q": "test"}, "thread_id": None},
             id="tc-2",
+            type="tool_call",
         )
         message = LC_AIMessage(content="done", tool_calls=[tool_call, agent_call])
 
@@ -280,7 +284,9 @@ def test_map_message_to_langchain_ai(self) -> None:
 
         assert isinstance(mapped, LC_AIMessage)
         assert mapped.content == "hi"
-        assert mapped.tool_calls == [LC_ToolCall(name="lookup", args={}, id="tc-1")]
+        assert mapped.tool_calls == [
+            LC_ToolCall(name="lookup", args={}, id="tc-1", type="tool_call")
+        ]
 
     def test_map_message_to_langchain_ai_with_text_content_block(self) -> None:
         extras = {
@@ -389,6 +395,7 @@ def test_map_message_to_langchain_ai_with_agent_call(self) -> None:
                 name=f"{lc.AGENT_PREFIX}assistant",
                 args={"args": {"q": "test"}, "thread_id": None},
                 id="tc-2",
+                type="tool_call",
             )
         ]
 
@@ -424,6 +431,7 @@ def test_map_message_to_langchain_ai_with_tool_call_with_thought_signature(
                 name=f"__local-startup_time",
                 args={"q": "test"},
                 id="tc-2",
+                type="tool_call",
             )
         ]
         assert mapped.additional_kwargs == extras
@@ -451,7 +459,9 @@ def test_map_message_to_langchain_tool_call_with_reserved_prefix(self) -> None:
         )
         assert isinstance(message, LC_AIMessage)
         assert message.tool_calls == [
-            LC_ToolCall(name="__tool-__agent-bad-tool", args={}, id="tc-1")
+            LC_ToolCall(
+                name="__tool-__agent-bad-tool", args={}, id="tc-1", type="tool_call"
+            )
         ]
 
         message = lc._map_message_to_langchain(
@@ -466,7 +476,7 @@ def test_map_message_to_langchain_tool_call_with_reserved_prefix(self) -> None:
         )
         assert isinstance(message, LC_AIMessage)
         assert message.tool_calls == [
-            LC_ToolCall(name="__tool-__bad-tool", args={}, id="tc-2")
+            LC_ToolCall(name="__tool-__bad-tool", args={}, id="tc-2", type="tool_call")
         ]
 
         message = lc._map_message_to_langchain(
@@ -535,6 +545,7 @@ def test_map_message_to_langchain_agent_call_with_agent_prefix_raises(
                 name="__agent-__agent-bad-agent",
                 args={"args": {}, "thread_id": None},
                 id="tc-1",
+                type="tool_call",
             )
         ]