> ## Documentation Index
> Fetch the complete documentation index at: https://agent-observability-docs.splunk.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Luna Studio UI

> Use the Luna Studio web app to create, train, and register custom Luna evaluators.

<img className="block dark:hidden h-10 my-6" src="https://mintcdn.com/agent-observability-docs/Y4gaVgpsSUs8MBdT/images/luna-studio/logo/light.svg?fit=max&auto=format&n=Y4gaVgpsSUs8MBdT&q=85&s=223003a5a3f88a02a02c43cbbc6b0b94" alt="Luna Studio" noZoom width="268" height="48" data-path="images/luna-studio/logo/light.svg" />

<img className="hidden dark:block h-10 my-6" src="https://mintcdn.com/agent-observability-docs/Y4gaVgpsSUs8MBdT/images/luna-studio/logo/dark.svg?fit=max&auto=format&n=Y4gaVgpsSUs8MBdT&q=85&s=e2b18e53c138087db47dea08fc5dbebb" alt="Luna Studio" noZoom width="268" height="48" data-path="images/luna-studio/logo/dark.svg" />

The Luna Studio UI is Splunk Agent Observability's web app for building real-time **custom evaluators** tuned to your AI agent. You bring a human-labelled test set; Luna Studio generates a training set from it, fine-tunes a [Luna evaluator](/concepts/luna/luna) on the result, and lets you register eligible evaluators in the [Splunk Agent Observability evaluators store](/concepts/evaluators/overview) for use in evaluation, observability, and guardrails.

If you've ever wanted an evaluator that understands *your* definition of "tone consistent", "grounded answer", or "policy-violating output" — without writing a custom evaluator from scratch — Luna Studio is built for that.

<Note>
  **Enterprise tier and your own deployment.** Luna Studio is part of the enterprise tier of Splunk Agent Observability and is deployed by Splunk Agent Observability into your own cluster or cloud. See [Availability and deployment](/luna-studio/ui/availability), or [contact
  us](https://www.splunk.com/en_us/about-splunk/contact-us.html) to get started.
</Note>

<Frame caption="The Projects page — your home base in Luna Studio">
  <img src="https://mintcdn.com/agent-observability-docs/gQpj8uYVjt4F9vOJ/images/luna-studio/projects/projects-home.png?fit=max&auto=format&n=gQpj8uYVjt4F9vOJ&q=85&s=190d696bb2ec7fe118f2c2756278e937" alt="Luna Studio projects page" width="2021" height="1186" data-path="images/luna-studio/projects/projects-home.png" />
</Frame>

## What you can do

<CardGroup cols={2}>
  <Card title="Fine-tune a custom Luna evaluator" icon="sparkles" href="/luna-studio/ui/quickstart">
    Pick an evaluator template, supply a test set, generate a training set, and launch a training run — all in a guided flow.
  </Card>

  <Card title="Create synthetic data" icon="database" href="/luna-studio/ui/datasets/overview">
    Upload a representative CSV test set, fetch a CSV over HTTP(S), or import one from Splunk Agent Observability. In the run wizard, test sets require at least 300 rows total and 100 per class; Luna Studio targets 2,000 synthetic labelled examples and can append enhancement rows to the final training split.
  </Card>

  <Card title="Track training runs" icon="chart-line" href="/luna-studio/ui/projects/training-runs-home">
    Filter, star, and compare runs across the complete data-generation, training, registration, failure, and cancellation lifecycle.
  </Card>

  <Card title="Register custom evaluators" icon="circle-check" href="/luna-studio/ui/runs/register-evaluator">
    Once an eligible Luna evaluator is ready, register it so it shows up across the Splunk Agent Observability platform.
  </Card>
</CardGroup>

## Who Luna Studio is for

* **ML and AI engineers** who need evaluators tailored to a specific domain (legal, healthcare, RAG over internal docs, multilingual support, etc.).
* **Applied scientists** who want to skip the boilerplate of fine-tuning evaluator models.
* **Platform teams** standardizing how their organization evaluates LLM applications across many products.

## Start here

<CardGroup cols={2}>
  <Card title="Availability and deployment" icon="building" href="/luna-studio/ui/availability">
    How Luna Studio is provisioned for your organization, and what's fixed at deployment time.
  </Card>

  <Card title="Quickstart" icon="rocket" href="/luna-studio/ui/quickstart">
    The fastest path from sign up to a registered evaluator.
  </Card>

  <Card title="Core concepts" icon="book-open" href="/luna-studio/ui/core-concepts">
    Projects, runs, evaluators, test sets, training sets, and how they fit together.
  </Card>
</CardGroup>

## Where to go next

* New to evaluators? Read [Core concepts](/luna-studio/ui/core-concepts).
* Already have a Splunk Agent Observability account? Jump to the [Quickstart](/luna-studio/ui/quickstart).
* Wondering which platforms we support? See [Integrations overview](/luna-studio/ui/integrations/overview).
* Stuck? Check the [FAQ](/luna-studio/ui/reference/faq) and [Troubleshooting](/luna-studio/ui/reference/troubleshooting).