Weights & Biases

Weights & Biases is an AI developer platform for building, managing, evaluating, and monitoring AI applications, agents, and machine-learning models. It includes W&B Models for experiment tracking and model management, W&B Weave for agent/LLM tracing, evaluation, and monitoring, registry and lineage features, SDK/API tooling, deployment options, and agent-facing capabilities such as an MCP server.