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# Graphsignal
This page covers how to use the Graphsignal to trace and monitor LangChain.
## Installation and Setup
- Install the Python library with `pip install graphsignal`
- Create free Graphsignal account [here](https://graphsignal.com)
- Get an API key and set it as an environment variable (`GRAPHSIGNAL_API_KEY`)
## Tracing and Monitoring
Graphsignal automatically instruments and starts tracing and monitoring chains. Traces, metrics and errors are then available in your [Graphsignal dashboard](https://app.graphsignal.com/). No prompts or other sensitive data are sent to Graphsignal cloud, only statistics and metadata.
Initialize the tracer by providing a deployment name:
```python
import graphsignal
graphsignal.configure(deployment='my-langchain-app-prod')
```
In order to trace full runs and see a breakdown by chains and tools, you can wrap the calling routine or use a decorator:
```python
with graphsignal.start_trace('my-chain'):
chain.run("some initial text")
```
Optionally, enable profiling to record function-level statistics for each trace.
```python
with graphsignal.start_trace(
'my-chain', options=graphsignal.TraceOptions(enable_profiling=True)):
chain.run("some initial text")
```
See the [Quick Start](https://graphsignal.com/docs/guides/quick-start/) guide for complete setup instructions.
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