From d868f39aea0df06bbf3bd1e94e218c8abe5850f4 Mon Sep 17 00:00:00 2001
From: Allen Porter <allen@thebends.org>
Date: Fri, 11 Apr 2025 08:30:12 -0700
Subject: [PATCH] Fix Anthropic bug parsing a streaming response with no json
 (#142745)

---
 .../components/anthropic/conversation.py      |  2 +-
 .../components/anthropic/test_conversation.py | 20 +++++++++++++++++--
 2 files changed, 19 insertions(+), 3 deletions(-)

diff --git a/homeassistant/components/anthropic/conversation.py b/homeassistant/components/anthropic/conversation.py
index 5e5ad464eaa..288ec63509e 100644
--- a/homeassistant/components/anthropic/conversation.py
+++ b/homeassistant/components/anthropic/conversation.py
@@ -266,7 +266,7 @@ async def _transform_stream(
                 raise ValueError("Unexpected stop event without a current block")
             if current_block["type"] == "tool_use":
                 tool_block = cast(ToolUseBlockParam, current_block)
-                tool_args = json.loads(current_tool_args)
+                tool_args = json.loads(current_tool_args) if current_tool_args else {}
                 tool_block["input"] = tool_args
                 yield {
                     "tool_calls": [
diff --git a/tests/components/anthropic/test_conversation.py b/tests/components/anthropic/test_conversation.py
index 67a4434a664..caaef43e931 100644
--- a/tests/components/anthropic/test_conversation.py
+++ b/tests/components/anthropic/test_conversation.py
@@ -303,11 +303,27 @@ async def test_conversation_agent(
 
 
 @patch("homeassistant.components.anthropic.conversation.llm.AssistAPI._async_get_tools")
+@pytest.mark.parametrize(
+    ("tool_call_json_parts", "expected_call_tool_args"),
+    [
+        (
+            ['{"param1": "test_value"}'],
+            {"param1": "test_value"},
+        ),
+        (
+            ['{"para', 'm1": "test_valu', 'e"}'],
+            {"param1": "test_value"},
+        ),
+        ([""], {}),
+    ],
+)
 async def test_function_call(
     mock_get_tools,
     hass: HomeAssistant,
     mock_config_entry_with_assist: MockConfigEntry,
     mock_init_component,
+    tool_call_json_parts: list[str],
+    expected_call_tool_args: dict[str, Any],
 ) -> None:
     """Test function call from the assistant."""
     agent_id = "conversation.claude"
@@ -343,7 +359,7 @@ async def test_function_call(
                         1,
                         "toolu_0123456789AbCdEfGhIjKlM",
                         "test_tool",
-                        ['{"para', 'm1": "test_valu', 'e"}'],
+                        tool_call_json_parts,
                     ),
                 ]
             )
@@ -387,7 +403,7 @@ async def test_function_call(
         llm.ToolInput(
             id="toolu_0123456789AbCdEfGhIjKlM",
             tool_name="test_tool",
-            tool_args={"param1": "test_value"},
+            tool_args=expected_call_tool_args,
         ),
         llm.LLMContext(
             platform="anthropic",