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

# Debug a Request with Reruns + Evaluations

> Test variations of a single request (model/messages) and evaluate them with Sentinels

This recipe is for “I have one problematic request, I want to try changes quickly and see what improves.”

## 1) Open the Request Overview page

You can reach a Request detail page from:

* an Intent Group’s **Requests** tab, or
* `Test > Evaluations` (open a request from a row), or
* Test Set / Test Run request tables (open a request from a row)

See: [Request Overview](/observe/request_overview)

## 2) Create a rerun version

On the right side of the Request page, open the **Versions** panel and click **New Rerun**.

Then:

1. Select the new rerun version from the Versions list.
2. Adjust the rerun inputs (for example, model selection and messages as needed).
3. Click **Run Request** to execute the rerun.

The rerun will capture a new response and show its basic metrics (time / tokens / cost) in the UI.

## 3) Evaluate the rerun with Sentinels

On the same Request page, use the **Evaluation** section:

1. Click **Add Evaluation**
2. Select the sentinel(s) you want to run
3. Click **Run Evaluation**

This makes it easy to compare sentinel outcomes between the **original request** and your **rerun**.

See: [Evaluating a Request](/observe/sentinels/request_evaluations)

## 4) Promote the original case into a Test Set (optional)

If this is a case you don’t want to regress on:

1. Switch back to **Original** in the Versions panel.
2. Click **Add to Test Set**.
3. Add tags and submit.

Then run a Test Run on that Test Set to verify improvements at scale.

See:

* [Test Set Creation](/test/test_sets/creation)
* [Test Run Execution](/test/test_sets/execution)