Weights & Biases

Weights & Biases is W&B's AI developer platform for building AI agents, applications, and models. It combines W&B Models for experiment tracking and model management, W&B Weave for tracing/evaluating/monitoring LLM and agent applications, registry capabilities, hosted/self-managed deployment options, and agent-facing tools such as a W&B MCP Server for querying W&B runs, traces, evaluations, and artifacts.