Tools
LangSmith SDK 0.12.0 makes trace sampling deterministic and fails closed when an anonymizer throws
Released 2026-09-01, LangSmith SDK v0.12.0 ships three breaking changes: trace sampling is now deterministic (#3183), per-function anonymization callables fail closed when they raise instead of letting unredacted data through (#3328), and the SDK switches to httpx2 with httpx kept as a fallback (#3406). It also compresses replica writes that carry their own credentials and serializes identical replicas once into a single frame. The fail-closed anonymizer change is the one to read before upgrading: traces that previously shipped will now be dropped.
Source
↳ Follow the thread