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LangChain AI Updates: August 21, 2026

langchain langsmith agents testing

1. LangSmith Adds Preview Builds for Testing Agent Changes

LangChain. LangChain introduced LangSmith Preview Builds, which lets teams test agent changes in an isolated preview environment before shipping them to production. The capability aims to catch behavior regressions earlier in the development cycle, where non-deterministic agents are hard to validate. It brings a preview-deploy pattern familiar from web development to agent engineering. Source