LangSmith Agent Builder is now LangSmith Fleet We've renamed LangSmith Agent Builder to LangSmith Fleet . What changed Agent Builder is now LangSmith Fleet . You'll see the new name reflected across the... March 19, 2026
LangSmith Pin a baseline experiment in LangSmith You can now pin any experiment as your baseline, so every subsequent run is automatically measured against it. Instead of manually selecting experiments for... February 19, 2026
LangSmith Agent Builder: chat, file uploads, and tool registry We built Agent Builder around a simple idea: working with an agent should feel like working with a teammate. There's now a central Chat agent with access to... February 18, 2026
LangSmith Scheduled reports for Insights Agent The LangSmith Insights Agent now runs on your schedule, no manual triggers required. Set a recurring cadence (daily, weekly, or a custom cron expression) and... February 17, 2026
v0.13.10 LangSmith Customize trace previews in LangSmith You can now configure which parts of a trace’s inputs and outputs appear directly in the tracing table. This is especially useful for projects with custom... February 6, 2026
LangSmith Track costs across your entire agent stack LangSmith now gives you a unified view of costs across your full agent workflow, not just LLM calls. Submit custom cost metadata for any run, whether that's... February 5, 2026
v0.12.61 LangSmith Pairwise annotation queues for comparing agent outputs Pairwise Annotation Queues in LangSmith are a fast, structured way to compare two agent outputs side-by-side and pick a winner. Scoring subjective tasks is... December 17, 2025
LangSmith LangSmith Fetch: Debug agents from your terminal We've launched LangSmith Fetch — a CLI tool that brings full LangSmith trace access directly into your terminal, coding environment, or IDE. If you build... December 10, 2025
LangSmith LangSmith Polly, our AI assistant for debugging, analyzing, and improving agents, is now in beta We've launched Polly — an AI-powered assistant inside LangSmith that helps you debug, analyze, and improve your agents. Polly, now in beta, understands agent... December 10, 2025
v0.12.61 LangSmith Unified cost tracking for LLMs, tools, retrieval We’ve added full-stack cost tracking to LangSmith to make it easier to understand and monitor spend across complex agent applications. LangSmith now... December 2, 2025
