LangSmith Preview Builds: Test agent changes before production

LangSmith Preview Builds, available in public beta for GitHub-connected LangSmith Cloud deployments, create temporary isolated, production-like environments from pull request branches so teams can test agent changes before merging. Each preview runs the proposed code without altering its parent deployment, enabling collaborators to evaluate prompts, tool calls, traces, dependencies, integrations, failure paths, and user behavior in a consistent shared environment without reproducing local setups. Previews automatically update when new commits are pushed and can be triggered for every pull request or only when a configured GitHub label is applied. Multiple previews can run independently for separate pull requests, while idle time-to-live settings, concurrency limits, and manual deletion help manage resource use. Preview deployments initially inherit parent secrets, though teams are advised to use credentials scoped for preview workloads when contributors may be less trusted.

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