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Reusable Evaluators and Template Library: LangSmith Eval Updates

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LangSmith introduces reusable evaluators and a library of 30+ evaluator templates to standardize and scale agent evaluation across projects. Teams can define evaluation logic once and apply it across tracing workflows, ensuring consistent safety checks, response quality metrics, and trajectory validation. The templates cover safety (prompt injection, PII, toxicity), response quality, multi-step agent trajectories, user behavior analysis, and multimodal outputs. These evaluators support both online monitoring of production traffic and offline experimentation, enabling teams to detect failures, analyze agent decisions, and continuously improve performance without rebuilding evaluation logic from scratch.

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