---
title: "Create Evaluator Variant"
method: POST
path: "/evaluators/variants/"
tags: ["Evaluators"]
---

# Create Evaluator Variant

`POST /evaluators/variants/`

Create a new variant on an existing evaluator.

A variant is a named branch of the evaluator's history. New
revisions committed to this variant do not touch other variants.
See the Versioning guide.

## Request body

- EvaluatorVariantCreateRequest — Body for creating a new variant on an existing evaluator.
  - `evaluator_variant` EvaluatorVariantCreate, required
    - `evaluator_id` string, uuid, nullable
    - `workflow_id` string, uuid, nullable
    - `artifact_id` string, uuid, nullable
    - `flags` EvaluatorFlags — Legacy full evaluator flag set.
      - `is_application` boolean
      - `is_evaluator` boolean
      - `is_snippet` boolean
      - `is_managed` boolean
      - `is_custom` boolean
      - `is_llm` boolean
      - `is_hook` boolean
      - `is_code` boolean
      - `is_match` boolean
      - `is_feedback` boolean
      - `is_chat` boolean
      - `has_url` boolean
      - `has_script` boolean
      - `has_handler` boolean
    - `tags` object, nullable
    - `meta` object, nullable
    - `name` string, nullable
    - `description` string, nullable
    - `slug` string, nullable

## Response `200`

Successful Response

- EvaluatorVariantResponse — Envelope for a single evaluator variant.
  - `count` integer — 1 when a variant is returned, 0 otherwise.
  - `evaluator_variant` EvaluatorVariant
    - `evaluator_slug` string, nullable
    - `workflow_slug` string, nullable
    - `evaluator_id` string, uuid, nullable
    - `workflow_id` string, uuid, nullable
    - `artifact_slug` string, nullable
    - `artifact_id` string, uuid, nullable
    - `flags` EvaluatorVariantFlags
      - `is_application` boolean
      - `is_evaluator` boolean
      - `is_snippet` boolean
    - `tags` object, nullable
    - `meta` object, nullable
    - `name` string, nullable
    - `description` string, nullable
    - `created_at` string, date-time, nullable
    - `updated_at` string, date-time, nullable
    - `deleted_at` string, date-time, nullable
    - `created_by_id` string, uuid, nullable
    - `updated_by_id` string, uuid, nullable
    - `deleted_by_id` string, uuid, nullable
    - `slug` string, nullable
    - `id` string, uuid, nullable

## Other responses

- `422` — Validation Error

## Changes

- **2026-05-22** `ca3686e05842` — 3 info
  - added the optional property `evaluator_variant/anyOf[subschema #1: EvaluatorVariant]/artifact_slug` to the response with the `200` status
  - added the optional property `evaluator_variant/anyOf[subschema #1: EvaluatorVariant]/evaluator_slug` to the response with the `200` status
  - added the optional property `evaluator_variant/anyOf[subschema #1: EvaluatorVariant]/workflow_slug` to the response with the `200` status
- **2026-05-19** `a7f9a6823230` — 2 warning
  - removed the optional property `support_id` from the response with the `200` status
  - removed the optional property `support_ts` from the response with the `200` status
- **2026-04-23** `925e8b901a26` — 2 info
  - added the optional property `support_id` to the response with the `200` status
  - added the optional property `support_ts` to the response with the `200` status
- **2026-04-16** `8b06b786c977` — 1 warning, 13 info
  - removed the request property `evaluator_variant/flags/anyOf[subschema #1: EvaluatorFlags]/is_human`
  - added the new optional request property `evaluator_variant/flags/anyOf[subschema #1: EvaluatorFlags]/has_handler`
  - added the new optional request property `evaluator_variant/flags/anyOf[subschema #1: EvaluatorFlags]/has_script`
  - added the new optional request property `evaluator_variant/flags/anyOf[subschema #1: EvaluatorFlags]/has_url`
  - …10 more
- **2026-02-27** `8fcd55a5a656` — 1 info
  - endpoint added

[Full history](https://skmtc.dev/agenta-ai/apis/agenta-api/changes/evaluators/variants/post.md)

---

[API](https://skmtc.dev/agenta-ai/apis/agenta-api.md) · [All operations](https://skmtc.dev/agenta-ai/apis/agenta-api/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/agenta-ai/agenta-api/revisions/ca3686e05842/schema)