fix(sdk): stop ChatAnthropic emitting a duplicate event per LLM call - #86
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Summary
ChatAnthropic goes through the same Anthropic SDK methods Adrian patches, so every LangChain call produced two LLM events instead of one, which double-counts events and tokens. The fix is a chat_model_scope() contextvar set across the four patched BaseChatModel entry points. The Anthropic wrappers check it and skip emitting when LangChain already owns the call, verified at 1 event per call for ainvoke, astream and the raw SDK, with 5 new tests and 394 passing.
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