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

# Automation scorer failures due to Gemini gateway routing errors

export const plans_0 = "Any"

export const deployments_0 = "Any"

export const data_plane_version_0 = undefined

export const use_case_0 = "Use case - Online scoring automations that silently stop firing because the scorer's Gemini model is unavailable or misconfigured in the AI gateway"

<Note>
  **Applies to:**

  * Plan - {plans_0}
  * Deployment - {deployments_0}
  * {data_plane_version_0}
  * {use_case_0}
</Note>

## Summary

**Issue:** Automations configured to run scorers stop firing silently, with no UI error. Playground tests return `Braintrust gateway error: Unable to detect source format`, and backend logs show `unknown model` or `provider not configured` for Gemini models such as `gemini-2.5-flash`, `gemini-2.5-pro`, or `gemini-3-flash-preview`.

**Cause:** The Gemini model configured in the scorer is unavailable or not routable through the currently enabled AI providers in your Braintrust org.

**Resolution:** Enable the Vertex AI default registry and update affected scorers to use a valid Vertex model ID.

## Resolution steps

### Step 1: Enable the Vertex AI default registry

1. Go to **Settings → AI providers** in your Braintrust org.
2. Locate the Vertex AI provider and enable the **default registry**.

### Step 2: Update the affected scorer

Open each affected scorer and change the configured model to one available in the Vertex registry (for example, `publishers/google/models/gemini-2.5-flash` or `gemini-2.5-flash`).

### Step 3: Verify the automation fires

Trigger a manual test of the automation or apply the scorer directly to a log entry. Confirm that scores are written and no gateway error is returned.

### If you prefer to avoid Vertex AI

#### Step 1: Switch to a different model provider

Update the scorer to use a model from a provider already configured and verified in your org (for example, an OpenAI or Anthropic model). Retry the automation test to confirm it runs successfully.

## Notes

* Silent failures occur because scorer LLM call errors at the gateway layer do not surface as visible errors in the automation UI.
* If multiple automations stopped firing around the same date, check whether a model was removed or a provider configuration changed around that time.
* If the playground returns `Unable to detect source format`, treat this as a signal of a misconfigured or unavailable model rather than a data formatting issue.