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

# Fork Evaluator Variant

`POST /evaluators/variants/fork`

Fork an evaluator variant into a new variant.

Creates a new branch whose initial revision is copied from the
source. Use this to experiment without touching the original.
The returned variant has a fresh id and slug but inherits
lineage metadata from its source.

## Query parameters

- `evaluator_variant_id` string, uuid, nullable

## Request body

- EvaluatorVariantForkRequest
  - `evaluator_variant` EvaluatorVariantFork, required
    - `flags` EvaluatorVariantFlags
      - `is_application` boolean
      - `is_evaluator` boolean
      - `is_snippet` boolean
    - `tags` object, nullable
    - `meta` object, nullable
    - `name` string, nullable
    - `description` string, nullable
    - `slug` string, nullable
  - `evaluator_variant_ref` Reference, required
    - `version` string, nullable
    - `slug` string, nullable
    - `id` string, uuid, nullable
  - `evaluator_revision_ref` Reference
    - `version` string, nullable
    - `slug` string, nullable
    - `id` string, uuid, 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

---

[API](https://skmtc.net/agenta-ai/apis/agenta-api.md) · [All operations](https://skmtc.net/agenta-ai/apis/agenta-api/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/agenta-ai/agenta-api/revisions/ea6421d829f1/schema)