LangSmith

Trace AI agents and inspect quality, cost, and latency

Meet LangSmith

LangSmith traces and evaluates applications using language models or agents. A trace shows the steps of a run, including tool calls and multi-turn messages, for examining response quality, latency, or cost. SDKs and OpenTelemetry connect different frameworks to the platform.

Production dashboards follow usage, errors, and feedback. Code-based and model-based evaluations score the characteristics a team selects, with alerts for configured thresholds. Trace analysis groups common behaviors and failures. Developers can inspect a particular run or compare a recurring pattern, then use evaluations to examine the application's behavior after a change.

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Product details

Website: langchain.com
Status: Launched
Category: Developer tools
Listed: Oct 9, 2026

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AI AI agents Evaluation Observability SDK

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