What is LangSmith?
Sep 22, 2026LangChain
Summary
This post introduces LangSmith as LangChain's comprehensive platform for agent development. It highlights key features such as tracing agent execution to debug issues, using datasets and evaluators for testing, and deploying/monitoring agents in production. The post also mentions annotation queues, insights, and the LangSmith Engine, positioning LangSmith as a central hub for the agent development lifecycle.
More from the Agent Memory Management trail
- How to go from your agent's traces to a fine-tuned model in one workflow
- Introducing LangSmith Trajectories: A readable view of every agent session
- Introducing LangSmith Engine v2: Detect and ship fixes to agents faster
- Introducing LangSmith Custom Apps: Build custom interfaces around your agent data
- Schedules for Managed Deep Agents: Cron jobs, prompts, and Slack delivery