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PATCH
/
v2
/
evaluators
/
{evaluator_id}
Update evaluator
curl --request PATCH \
  --url https://api.arize.com/v2/evaluators/{evaluator_id} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "name": "Updated Evaluator Name",
  "description": "Updated description"
}
'
{
  "id": "RXZhbHVhdG9yOjEyOmFCY0Q=",
  "name": "Updated Evaluator Name",
  "description": "Updated description",
  "type": "template",
  "space_id": "U3BhY2U6NDkzOkJaSkc=",
  "created_at": "2026-02-16T22:05:47.900Z",
  "updated_at": "2026-02-17T10:30:00.000Z",
  "created_by_user_id": "VXNlcjoxOm5OYkM="
}

Authorizations

​
Authorization
string
header
required

Most Arize AI endpoints require authentication. For those endpoints that require authentication, include your API key in the request header using the format

Path Parameters

​
evaluator_id
string
required

The unique evaluator identifier (base64) A universally unique identifier (base64-encoded opaque string).

Example:

"RW50aXR5OjEyMzQ1"

Body

application/json

Body containing evaluator update parameters

​
name
string

New evaluator name

​
description
string | null

New description

Response

Returns the updated evaluator

An evaluator defines reusable evaluation logic that can be attached to evaluation tasks. The type field determines the kind of evaluation: template (LLM-based template evaluation) or code (custom code evaluation).

​
id
string
required

The unique identifier for the evaluator

​
name
string
required

The name of the evaluator

​
type
enum<string>
required

The evaluator type: template (LLM-based) or code (managed built-in evaluators or custom Python code — both are subtypes of code, discriminated by the nested CodeConfig.type = managed | custom). Applies to both the parent Evaluator.type field and every version's type discriminator — a version's type must always match its parent evaluator's type.

Available options:
template,
code
​
space_id
string
required

The unique identifier for the space the evaluator belongs to

​
created_at
string<date-time>
required

When the evaluator was created

​
updated_at
string<date-time>
required

When the evaluator was last updated

​
created_by_user_id
string | null
required

The unique identifier for the user who created the evaluator

​
description
string | null

The description of the evaluator