LangSmith Sandboxes Private Preview: Locked-Down Temporary Environments for Agent Code Execution with Granular Resource Control

LangChain Blog·medium signal

LangSmith Sandboxes are now in Private Preview, providing agents with locked-down, temporary environments to run code safely. Admins get granular control over access and resources — what files, network endpoints, and compute the sandbox can touch. This addresses the top agent security concern: uncontrolled code execution in production. Sandboxes complement the new ABAC permissions in LangSmith Fleet for defense-in-depth agent governance.