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LangSmith SDK 0.12.2 adds sandbox snapshot tags and stops treating 429 and 500 as terminal
Released 2026-09-05 at 20:25 UTC. PR #3447 adds snapshot-tag support to the Python sandbox client, so a sandbox can be resumed from a named snapshot rather than only an opaque id. PR #3480, a first contribution from @thibautlehmann, adds 429 and 500 to the retry `status_forcelist` (they were previously not retried), and #3493 retries rate-limited sandbox websocket connections in both the Python and JS clients. If you have been seeing LangSmith traces silently dropped under load, the missing 429 in the forcelist is the likely cause.
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