> ## Documentation Index
> Fetch the complete documentation index at: https://docs.langchain.com/llms.txt
> Use this file to discover all available pages before exploring further.
# Manage evaluators
> View and manage evaluators at the workspace level in LangSmith.
[Evaluators](/langsmith/evaluation-concepts#evaluators) in LangSmith are [workspace-level](/langsmith/administration-overview#workspaces) resources. You can attach a single evaluator to multiple [tracing projects](/langsmith/observability-concepts#projects) and [datasets](/langsmith/evaluation-concepts#datasets), so you can apply consistent evaluation logic across your work without recreating it each time.
The [LangSmith Engine](/langsmith/engine) suggests custom evaluators for detected issues and can deploy them with one click.
## View evaluators
In the [LangSmith UI](https://smith.langchain.com?utm_source=docs\&utm_medium=cta\&utm_campaign=langsmith-signup\&utm_content=langsmith-evaluators), select **Evaluators** in the left sidebar to view all evaluators in your workspace.
The evaluators table shows the following columns:
| Column | Description |
| --------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Name | The evaluator name |
| Type | **LLM as a judge** or **Code**. Composite score evaluators are scoped to individual tracing projects and datasets and do not appear here. |
| Feedback Key | The feedback key the evaluator produces |
| Projects & Datasets | Tracing projects and datasets this evaluator is attached to |
| Evaluator Trace Count (this week) | Number of traces this evaluator ran on in the past week. Only shown when spend tracking is enabled; **–** for Code evaluators or evaluators with no attached rules. |
| Spend (this week) | Estimated USD spend for this evaluator in the past week. Only shown when spend tracking is enabled; **–** for Code evaluators or evaluators with no attached rules. |
| Spend Status | Whether the evaluator is **Under limits**, **Unlimited**, or has hit one or more configured spend limits. Only shown when spend tracking is enabled; **–** for Code evaluators. |
| Created By | The workspace member who created the evaluator |
| Updated At | When the evaluator was last modified |
| Created At | When the evaluator was created |
## Create an evaluator
1. In the [LangSmith UI](https://smith.langchain.com?utm_source=docs\&utm_medium=cta\&utm_campaign=langsmith-signup\&utm_content=langsmith-evaluators), select **Evaluators** in the left sidebar.
2. Click **+ Evaluator** to open the new evaluator panel.
3. The panel lets you:
* **Create from scratch**: Build a new [LLM-as-a-Judge](/langsmith/llm-as-judge) or [Code](/langsmith/online-evaluations-code) evaluator.
* **Create from a template**: Start from a ready-made evaluator (also known as a prebuilt evaluator) for common evaluation patterns. A **Recommended** section surfaces popular templates first, followed by templates organized by the following categories:
| Category | Description |
| ----------------- | ---------------------------------------------------- |
| Security | Detect leaks, injections, and adversarial inputs. |
| Safety | Evaluate content safety and moderation. |
| Quality | Measure output quality and accuracy. |
| Conversation | Evaluate conversational quality and user experience. |
| Trajectory | Evaluate agent tool use and decision paths. |
| Image Evaluations | Evaluate image content quality and safety. |
| Voice Evaluation | Evaluate voice and audio interaction quality. |
You can also add an evaluator directly from a [tracing project](/langsmith/observability-concepts#projects) or [dataset](/langsmith/evaluation-concepts#datasets). In that flow, you can additionally **attach an existing evaluator** from your workspace, or create a [Composite](/langsmith/composite-evaluators-ui) evaluator. Refer to [Set up LLM-as-a-judge online evaluators](/langsmith/online-evaluations-llm-as-judge) and [Automatically run evaluators on experiments](/langsmith/bind-evaluator-to-dataset).
## View evaluator details
Click any evaluator in the table to open its detail view. The detail view has four tabs:
* **Overview**: The evaluator's feedback configuration and prompt or code definition.
* **Traces**: Traces processed by this evaluator across all attached resources.
* **Logs**: Execution logs for this evaluator across all attached resources.
* **Resources**: The tracing projects and datasets this evaluator is attached to.
## Edit an evaluator
Open an evaluator. In the **Overview** tab, click the **Edit evaluator** icon to open the **Configure Evaluator** panel. Update the evaluator's configuration. Click **Save**.
Because the evaluator is shared, changes apply across all tracing projects and datasets it is attached to.
## Delete an evaluator
An evaluator cannot be deleted while it is attached to a tracing project or dataset. To delete an evaluator, first remove it from all resources via the **Resources** tab, then delete it.
***
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