“My recommendation: Start with W&B Weave alone, unless LangSmith offers a specific evaluation or debugging workflow that your team needs.”
+ row-level experiment comparisons
“Yes — this is a supported feature”
+ framework-agnostic
“LangSmith is also framework-agnostic, so it isn't limited to LangChain or LangGraph agents.”
+ LangChain ecosystem
“Agent development workflow | General-purpose | Particularly strong LangChain ecosystem”
+ row-level prompt regression analysis
“Row-level prompt regression analysis | LangSmith is a strong choice”
− operational duplication
“The downside is operational duplication:”
“Yes. You don't need LangSmith just to get production observability if you're already using Weights & Biases Weave.”
+ production observability
“Weave supports the core production agent-observability workflow:”
+ agent debugging
“Agent debugging | Strong | Strong”
+ ML experiment tracking
“ML experiment tracking | Excellent integration | Not its primary focus”
+ covers fundamental production observability requirements
“My verdict: W&B Weave already covers the fundamental production observability requirements for agentic systems.”