---
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

- **2026-05-23** `2040366204e5` — 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
- **2026-05-22** `67e2a3c6952d` — 3 warning
  - removed the optional property `evaluator_variant/anyOf[subschema #1: EvaluatorVariant]/artifact_slug` from the response with the `200` status
  - removed the optional property `evaluator_variant/anyOf[subschema #1: EvaluatorVariant]/evaluator_slug` from the response with the `200` status
  - removed the optional property `evaluator_variant/anyOf[subschema #1: EvaluatorVariant]/workflow_slug` from the response with the `200` status
- **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
- …earlier changes not shown

[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/06e03dbce2be/schema)