LangSmith integration: connect LangSmith to Polylane

Connect your LangSmith workspace to let agents query traces, open failing runs, and compare error rates, latency, tokens, and cost across your tracing projects. Polylane watches each project for changes in errors, latency, and cost, and your LangSmith alert rules reach Polylane the moment they fire.

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Tools for the investigation.

What Polylane can do with LangSmith while it investigates. Every call is recorded in the transcript.

LangSmith Polylane MCP

langsmithListProjects List LangSmith tracing projects with run counts, error rates, latency, tokens and cost
langsmithQueryRuns Search LangSmith runs and traces by project, time window, status, run type and filter
langsmithGetTrace Read one LangSmith trace as a run tree with latency, tokens, cost and errors
langsmithGetProjectMetrics Read LangSmith project metrics over time: traces, errors, latency, LLM calls, tokens and cost
langsmithListFeedback List LangSmith feedback scores and comments on runs
langsmithListDatasets List LangSmith datasets and read dataset examples
langsmithListAlertRules List LangSmith alert rules and where each rule sends its alerts
langsmithApi Call the connected LangSmith REST API

Common questions.

Does Polylane replace LangSmith?

No. Your LangSmith setup stays where it is. Polylane connects to it and adds the triage, root cause and fixes on top.

Connect it once. Then get back to shipping.

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