feat(ai): add error handling to python ai sdk (#174)

CHANGELOG.md

@@ -1,3 +1,7 @@
+## 3.10.0 - 2025-01-24
+
+1. Add `$ai_error` and `$ai_is_error` properties to LangChain callback handler, OpenAI, and Anthropic.
+
 ## 3.9.2 - 2025-01-22
 
 1. Fix importing of LangChain callback handler under certain circumstances.

posthog/ai/langchain/callbacks.py

@@ -305,6 +305,8 @@ def on_llm_error(
             "$ai_latency": latency,
             "$ai_trace_id": trace_id,
             "$ai_base_url": run.get("base_url"),
+            "$ai_is_error": True,
+            "$ai_error": error.__str__(),
             **self._properties,
         }
         if self._distinct_id is None:

posthog/ai/utils.py

@@ -116,12 +116,17 @@ def call_llm_and_track_usage(
     error = None
     http_status = 200
     usage: Dict[str, Any] = {}
+    error_params: Dict[str, any] = {}
 
     try:
         response = call_method(**kwargs)
     except Exception as exc:
         error = exc
         http_status = getattr(exc, "status_code", 0)  # default to 0 becuase its likely an SDK error
+        error_params = {
+            "$ai_is_error": True,
+            "$ai_error": exc.__str__(),
+        }
     finally:
         end_time = time.time()
         latency = end_time - start_time
@@ -149,6 +154,7 @@ def call_llm_and_track_usage(
             "$ai_trace_id": posthog_trace_id,
             "$ai_base_url": str(base_url),
             **(posthog_properties or {}),
+            **(error_params or {}),
         }
 
         if posthog_distinct_id is None:
@@ -186,12 +192,17 @@ async def call_llm_and_track_usage_async(
     error = None
     http_status = 200
     usage: Dict[str, Any] = {}
+    error_params: Dict[str, any] = {}
 
     try:
         response = await call_async_method(**kwargs)
     except Exception as exc:
         error = exc
         http_status = getattr(exc, "status_code", 0)  # default to 0 because its likely an SDK error
+        error_params = {
+            "$ai_is_error": True,
+            "$ai_error": exc.__str__(),
+        }
     finally:
         end_time = time.time()
         latency = end_time - start_time
@@ -219,6 +230,7 @@ async def call_llm_and_track_usage_async(
             "$ai_trace_id": posthog_trace_id,
             "$ai_base_url": str(base_url),
             **(posthog_properties or {}),
+            **(error_params or {}),
         }
 
         if posthog_distinct_id is None:

posthog/test/ai/anthropic/test_anthropic.py

@@ -325,3 +325,17 @@ async def test_async_streaming_system_prompt(mock_client, mock_anthropic_stream)
         {"role": "system", "content": "You must always answer with 'Bar'."},
         {"role": "user", "content": "Foo"},
     ]
+
+
+def test_error(mock_client, mock_anthropic_response):
+    with patch("anthropic.resources.Messages.create", side_effect=Exception("Test error")):
+        client = Anthropic(api_key="test-key", posthog_client=mock_client)
+        with pytest.raises(Exception):
+            client.messages.create(model="claude-3-opus-20240229", messages=[{"role": "user", "content": "Hello"}])
+
+        assert mock_client.capture.call_count == 1
+
+        call_args = mock_client.capture.call_args[1]
+        props = call_args["properties"]
+        assert props["$ai_is_error"] is True
+        assert props["$ai_error"] == "Test error"

posthog/test/ai/openai/test_openai.py

@@ -173,3 +173,17 @@ def test_privacy_mode_global(mock_client, mock_openai_response):
         props = call_args["properties"]
         assert props["$ai_input"] is None
         assert props["$ai_output_choices"] is None
+
+
+def test_error(mock_client, mock_openai_response):
+    with patch("openai.resources.chat.completions.Completions.create", side_effect=Exception("Test error")):
+        client = OpenAI(api_key="test-key", posthog_client=mock_client)
+        with pytest.raises(Exception):
+            client.chat.completions.create(model="gpt-4", messages=[{"role": "user", "content": "Hello"}])
+
+        assert mock_client.capture.call_count == 1
+
+        call_args = mock_client.capture.call_args[1]
+        props = call_args["properties"]
+        assert props["$ai_is_error"] is True
+        assert props["$ai_error"] == "Test error"

posthog/version.py

@@ -1,4 +1,4 @@
-VERSION = "3.9.3"
+VERSION = "3.10.0"
 
 if __name__ == "__main__":
     print(VERSION, end="")  # noqa: T201