Add \$ai_lib_metadata to sync/async paths and tests

- Added \$ai_lib_metadata to call_llm_and_track_usage (sync)
- Added \$ai_lib_metadata to call_llm_and_track_usage_async (async)
- Added test assertion in test_basic_completion
- Placed metadata at end of properties for consistency

All tests pass successfully.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: andrewm4894

posthog/ai/utils.py

@@ -320,6 +320,8 @@ def call_llm_and_track_usage(
                 ph_client, posthog_privacy_mode, kwargs.get("instructions")
             )
 
+        event_properties["$ai_lib_metadata"] = {"schema": "v1", "frameworks": [{"name": provider}]}
+
         # send the event to posthog
         if hasattr(ph_client, "capture") and callable(ph_client.capture):
             ph_client.capture(
@@ -423,6 +425,8 @@ async def call_llm_and_track_usage_async(
                 ph_client, posthog_privacy_mode, kwargs.get("instructions")
             )
 
+        event_properties["$ai_lib_metadata"] = {"schema": "v1", "frameworks": [{"name": provider}]}
+
         # send the event to posthog
         if hasattr(ph_client, "capture") and callable(ph_client.capture):
             ph_client.capture(

posthog/test/ai/openai/test_openai.py

@@ -482,6 +482,10 @@ def test_basic_completion(mock_client, mock_openai_response):
 
         assert call_args["distinct_id"] == "test-id"
         assert call_args["event"] == "$ai_generation"
+        assert props["$ai_lib_metadata"] == {
+            "schema": "v1",
+            "frameworks": [{"name": "openai"}],
+        }
         assert props["$ai_provider"] == "openai"
         assert props["$ai_model"] == "gpt-4"
         assert props["$ai_input"] == [{"role": "user", "content": "Hello"}]