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## Summary - Adds a `langsmith_tracing` parameter to `runs.create()`, `runs.stream()`, and `runs.wait()` on both async and sync SDK clients - Accepts a `LangSmithTracing` TypedDict with optional `project_name` and `example_id` fields - Maps to the server's existing `langsmith_tracer` payload key, enabling users to route traces to specific LangSmith projects or associate with dataset examples from the SDK ## Test plan - [x] Unit tests verify payload serialization (langsmith_tracing → langsmith_tracer mapping) - [x] Unit tests verify key is excluded when param not provided - [x] Unit tests verify partial configs (project_name only) work - [x] API parity tests pass (async/sync client signatures match) - [x] Full test suite passes (86 tests) - [x] Lint + type check pass Release Notes: Added `langsmith_tracing` parameter to `runs.create()`, `runs.stream()`, and `runs.wait()` in the Python SDK, allowing users to route traces to a specific LangSmith project or associate with a dataset example. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-authored-by: Will Fu-Hinthorn <will@langchain.dev> Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>