Open sourcePython · ≈1.1k stars · Apache-2.0
W&B Weave
Toolkit for developing AI-powered applications, by Weights & Biases
Weave is a toolkit from Weights & Biases for developing AI-powered applications, used for tracing and evaluating LLM apps and agents.
The team behind it
Observability and continuous improvement for production agents
W&B Weave is Weights & Biases' observability and evaluation product for production AI agents. Its traces are organized around sessions, turns, steps, tools and sub-agents. It adds behavior monitoring with alerts, an evaluation API, guardrail scorers and leaderboards. Coding agents such as Claude Code can connect through W&B skills and an MCP server to read production data and run evaluations.
Neighbours on the workbench
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Alibaba's hybrid deterministic-plus-agent code review CLI.
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stanfordnlp/dspy
Programming, not prompting: optimize the whole pipeline.
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langfuse/langfuse
Open-source LLM engineering platform: traces, evals, prompts.
Maintained by Langfuse
Connections
Relations from the Harness Hub knowledge graph, as charted in the State of Harness reports.
Maintained by · 1
- Weights & Biases WeaveStartup
Similar entries · 3
- Arize AIStartup
- MLflowProject
- Weights & Biases WeaveStartup
Sources
Verified Oct 29, 2026