---
title: Agentic Instrumentation
description: Datadog, the leading service for cloud-scale monitoring.
breadcrumbs: >-
  Docs > Agent Observability > Agent Observability Instrumentation > Agentic
  Instrumentation
---

# Agentic Instrumentation

{% callout %}
# Important note for users on the following Datadog sites: app.ddog-gov.com, us2.ddog-gov.com

{% alert level="danger" %}
This product is not supported for your selected [Datadog site](https://docs.datadoghq.com/getting_started/site.md). ({% placeholder "user-datadog-site-name" /%}).
{% /alert %}

{% /callout %}

## Guidelines{% #guidelines %}

**Important**: Follow **all** guidelines listed here when following hyperlinks to other steps.

1. Only add Datadog Agent Observability and Datadog tracer-related code. Unless for the purposes of manual instrumentation, do not modify unrelated code.
1. If being run in a monorepo or project with multiple services or instrumentation targets, confirm with the user which service or sub-project should be instrumented with Agent Observability.
1. Install the latest Datadog SDKs. If it is already installed, check with the user if it is ok to update the dependency.

## Pre-requisites{% #pre-requisites %}

1. A Datadog API key is required to send Agent Observability data to Datadog. Without an API key, the user will not receive Agent Observability data, so this is a **hard requirement**. If the user has not provided one already and does not wish to provide one, continue instrumenting their application, making sure in an explicit call-out at the end that they must set it, and point them to where it can be set.
1. Determine the programming language and framework being used in the application to instrument. This is important for correctly instrumenting the application.

## Environment variables{% #environment-variables %}

All environment variables should be set *either* before the main application process starts up, or as the first lines of the application entrypoint.

These environment variables should not be inlined. Rather, they should be read from the process directly.

- For local development, set them in an appropriate `.env`, or similar, file for the application and the language it is written in, making sure those are populated when the Agent Observability SDK is initiated (see the language-specific guides for each)
- For non-local development, also let the user know which environment variables they will need to set

### API Key{% #api-key %}

This is **critical**. Set the API key with the following environment variable.

```bash
DD_API_KEY=<provided-dd-api-key>
```

### Enable Agent Observability{% #enable-agent-observability %}

This is **critical**. Set the following environment variables to properly enable Agent Observability.

```bash
DD_LLMOBS_ENABLED=true
DD_LLMOBS_AGENTLESS_ENABLED=true
```

### Agent Observability application name{% #agent-observability-application-name %}

This is **strongly suggested**. If the user provided an application name (or `DD_LLMOBS_ML_APP`) as part of the initial prompt, use that value. Otherwise, use a logical name based on the folder, repository, or project name.

```bash
DD_LLMOBS_ML_APP=<provided-or-inferred-application-name>
```

### Datadog site{% #datadog-site %}

This is **optional**. Set the Datadog site, corresponding to the datacenter associated with the user's API key. If not provided (possibly via `DD_SITE`), inform the user that the site of `datadoghq.com` will be used. *If* a value is provided, set it as an environment variable.

```bash
DD_SITE=<provided-dd-site>
```

## Instrument the application{% #instrument-the-application %}

Follow the instructions for the detected language:

| Language      | Instructions                                                                                                                  |
| ------------- | ----------------------------------------------------------------------------------------------------------------------------- |
| Python        | [Python Application Agentic Instrumentation](https://docs.datadoghq.com/llm_observability/instrumentation/agentic/python.md)  |
| Node.js       | [Node.js Application Agentic Instrumentation](https://docs.datadoghq.com/llm_observability/instrumentation/agentic/nodejs.md) |
| Java          | [Java Application Agentic Instrumentation](https://docs.datadoghq.com/llm_observability/instrumentation/agentic/java.md)      |
| OpenTelemetry | [OpenTelemetry Instrumentation](https://docs.datadoghq.com/llm_observability/instrumentation/otel_instrumentation.md)         |

## Viewing traces{% #viewing-traces %}

Let the user know that they can hit their application and see data in Datadog.

**Mandatory**: provide a permalink where the user can view the data associated with this application. This will take the form of

```
https://app.{dd_site}/llm/applications?query=@ml_app:{application_name}
```

Fill in the provided values:

1. `dd_site` - if the value was provided for Datadog site, use that value. Otherwise, use `datadoghq.com`.
1. `application_name` - use either the provided or inferred value from the Agent Observability application name section.