> ## Documentation Index
> Fetch the complete documentation index at: https://arize-ax.mintlify.dev/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Guardrails AI

> Trace Guardrails AI guard invocations with OpenInference and send spans to Arize AX for LLM observability.

[Guardrails AI](https://www.guardrailsai.com/) is a Python framework for adding validators and corrective behavior around LLM calls. Arize AX captures every Guardrails run — the guard wrapper, validator outcomes, and the underlying LLM call — via the [`openinference-instrumentation-guardrails`](https://github.com/Arize-ai/openinference/tree/main/python/instrumentation/openinference-instrumentation-guardrails) package, paired with the [`openinference-instrumentation-openai`](https://github.com/Arize-ai/openinference/tree/main/python/instrumentation/openinference-instrumentation-openai) instrumentor for full LLM-call detail.

<CardGroup>
  <Card horizontal icon="https://storage.googleapis.com/arize-phoenix-assets/assets/images/phoenix-docs-images/gc.ico" href="https://colab.research.google.com/github/Arize-ai/dataset-embeddings-guardrails/blob/main/validator/dataset_embeddings_guard.ipynb" title="Guardrails AI Tracing Tutorial (Google Colab)" />
</CardGroup>

## Prerequisites

* Python 3.10+
* An Arize AX account ([sign up](https://arize.com/sign-up/))
* An `OPENAI_API_KEY` from the [OpenAI Platform](https://platform.openai.com/api-keys)

## Launch Arize AX

1. Sign in to your [Arize AX account](https://app.arize.com/).
2. From **Space Settings**, copy your **Space ID** and **API Key**. You will set them as `ARIZE_SPACE_ID` and `ARIZE_API_KEY` below.

## Install

```bash theme={null}
pip install arize-otel \
  openinference-instrumentation-guardrails \
  openinference-instrumentation-openai \
  guardrails-ai openai
```

## Configure credentials

```bash theme={null}
export ARIZE_SPACE_ID="<your-space-id>"
export ARIZE_API_KEY="<your-api-key>"
export ARIZE_PROJECT_NAME="guardrails-ai-tracing-example"
export OPENAI_API_KEY="<your-openai-api-key>"
```

## Setup tracing

```python theme={null}
# instrumentation.py
import os

from arize.otel import register
from openinference.instrumentation.guardrails import GuardrailsInstrumentor
from openinference.instrumentation.openai import OpenAIInstrumentor

tracer_provider = register(
    space_id=os.environ["ARIZE_SPACE_ID"],
    api_key=os.environ["ARIZE_API_KEY"],
    project_name=os.environ["ARIZE_PROJECT_NAME"],
)

GuardrailsInstrumentor().instrument(tracer_provider=tracer_provider)
OpenAIInstrumentor().instrument(tracer_provider=tracer_provider)
print("Arize AX tracing initialized for Guardrails AI.")
```

## Run Guardrails AI

```python theme={null}
# example.py

# Importing instrumentation first ensures tracing is set up
# before `guardrails` is imported.
from instrumentation import tracer_provider

from guardrails import Guard

guard = Guard()

response = guard(
    model="gpt-5",
    messages=[
        {
            "role": "user",
            "content": "Why is the ocean salty? Answer in two sentences.",
        },
    ],
)

print(response.validated_output)
```

### Expected output

```text wrap theme={null}
Arize AX tracing initialized for Guardrails AI.
The ocean is salty because rivers continuously dissolve mineral salts from rocks and soil and carry them to the sea, where they accumulate over millions of years. Water leaves the ocean through evaporation but the salts remain, steadily concentrating until reaching today's roughly 3.5% salinity.
```

## Verify in Arize AX

1. Open your Arize AX space and select project **`guardrails-ai-tracing-example`**.
2. You should see a new trace within \~30 seconds containing a `guard` parent span wrapping a nested OpenAI `ChatCompletion` LLM child span with the prompt, response, and token usage attached.
3. If no traces appear, see [Troubleshooting](#troubleshooting).

## Troubleshooting

* **No traces in Arize AX.** Confirm `ARIZE_SPACE_ID` and `ARIZE_API_KEY` are set in the same shell that runs `example.py`. Enable OpenTelemetry debug logs with `export OTEL_LOG_LEVEL=debug` and re-run.
* **Guardrails spans missing but OpenAI spans present.** `GuardrailsInstrumentor().instrument(...)` must run before any `from guardrails import ...`. Make sure `instrumentation.py` is the first import in your entry point.
* **`401` from OpenAI.** Verify `OPENAI_API_KEY` is set and has access to `gpt-5`. Swap for a model your key can call.
* **Adding validators.** This minimal example uses a no-op `Guard()`. To attach validators (e.g. PII redaction, regex match, semantic similarity), install them from [Guardrails Hub](https://hub.guardrailsai.com/) with `guardrails hub install hub://guardrails/<validator>`. Validator outcomes appear as attributes on the Guardrails span.

## Resources

<CardGroup>
  <Card icon="book-open" href="https://www.guardrailsai.com/docs" title="Guardrails AI Documentation" horizontal />

  <Card icon="terminal" href="https://github.com/Arize-ai/openinference/tree/main/python/instrumentation/openinference-instrumentation-guardrails" title="OpenInference Guardrails Instrumentor" horizontal />

  <Card icon="github" href="https://github.com/guardrails-ai/guardrails" title="Guardrails AI GitHub" horizontal />
</CardGroup>