| title | W&B Weave |
|---|---|
| description | Track, test, and improve language model apps with W&B Weave |
| mode | wide |
W&B Weave is an observability and evaluation platform that helps you track, evaluate, and improve your agents and LLM applications. With Weave, you can:
- Trace and collect metrics about your agents built with popular SDKs and harnesses using Weave OTel-compatible SDK
- Manually instrument your application's LLM calls and arbitrary functions to trace, version, and collect feedback about your application
- Evaluate your agent's or application's responses using LLM judges and custom scorers
Select your workload type and then use the following docs to guide you through the basics of how to use Weave's suite of tools. For more information about the difference between workloads, see What is Weave?
Pick a built-in integration for your agent SDK or harness and start tracing sessions, turns, LLM calls, and tool calls in the Agents view.<Card title="Send OpenTelemetry spans to the Agents view" icon="code" href="/weave/guides/tracking/trace-agents-otel"
Quickly configure your OTel-instrumented agent to send traces to Weave's OTLP endpoint. No Weave SDK installation required.
<Card title="View agent metrics in Weave UI" icon="chart-line" href="/weave/guides/tracking/view-agent-activity"
Trace a basic call to an LLM and review the inputs, outputs, and code in your W&B account.
<Card title="Get started evaluating your app" icon="clipboard-check" href="/weave/tutorial-eval"
Learn how to build an evaluation pipeline using Weave scorers to test and track your application's performance.
<Card title="Evaluate a RAG application" icon="search" href="/weave/tutorial-rag"
Build and evaluate RAG applications using Weave with LLM judges to measure retrieval quality.
W&B Weave provides Python and TypeScript libraries. To install the Weave library, run the following command:
```bash pip install weave ``` ```bash npm install weave ```To start using the Weave library, create a Weights & Biases (W&B) account and an API key at User Settings. The API key allows you to authenticate to your W&B account and start sending data to it.