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

# Fork Evaluator Variant

`POST /evaluators/variants/fork`

## Query parameters

- `evaluator_variant_id` string, uuid, nullable

## Request body

- EvaluatorForkRequest
  - `evaluator` EvaluatorFork, required
    - `evaluator_revision` EvaluatorRevisionFork
      - `flags` EvaluatorRevisionFlags
        - `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
      - `data` EvaluatorRevisionDataInput
        - `uri` string, nullable
        - `url` string, nullable
        - `headers` object, nullable
        - `runtime` 'python' | 'typescript' | 'javascript', nullable
        - `script` string, nullable
        - `schemas` JsonSchemasInput
          - `parameters` object, nullable
          - `inputs` object, nullable
          - `outputs` object, nullable
        - `parameters` object, nullable
      - `message` string, nullable
    - `revision` RevisionFork
      - `flags` object, nullable
      - `tags` object, nullable
      - `meta` object, nullable
      - `name` string, nullable
      - `description` string, nullable
      - `slug` string, nullable
      - `data` object, nullable
      - `message` string, nullable
    - `evaluator_revision_id` string, uuid, nullable
    - `workflow_revision_id` string, uuid, nullable
    - `evaluator_variant` EvaluatorVariantFork
      - `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
    - `variant` VariantFork
      - `flags` object, nullable
      - `tags` object, nullable
      - `meta` object, nullable
      - `name` string, nullable
      - `description` string, nullable
      - `slug` string, nullable
    - `evaluator_variant_id` string, uuid, nullable
    - `workflow_variant_id` string, uuid, nullable
    - `evaluator_id` string, uuid, nullable
    - `workflow_id` string, uuid, nullable
    - `workflow_revision` WorkflowRevisionFork
      - `flags` WorkflowRevisionFlags
        - `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
      - `data` WorkflowRevisionDataInput
        - `uri` string, nullable
        - `url` string, nullable
        - `headers` object, nullable
        - `runtime` 'python' | 'typescript' | 'javascript', nullable
        - `script` string, nullable
        - `schemas` JsonSchemasInput
          - `parameters` object, nullable
          - `inputs` object, nullable
          - `outputs` object, nullable
        - `parameters` object, nullable
      - `message` string, nullable
    - `revision_id` string, uuid, nullable
    - `workflow_variant` WorkflowVariantFork
      - `flags` WorkflowVariantFlags
        - `is_application` boolean
        - `is_evaluator` boolean
        - `is_snippet` boolean
      - `tags` object, nullable
      - `meta` object, nullable
      - `name` string, nullable
      - `description` string, nullable
      - `slug` string, nullable
    - `variant_id` string, uuid, nullable
    - `artifact_id` string, uuid, nullable
    - `depth` integer, nullable

## Response `200`

Successful Response

- EvaluatorVariantResponse
  - `count` integer
  - `evaluator_variant` EvaluatorVariant
    - `evaluator_id` string, uuid, nullable
    - `workflow_id` string, uuid, 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

- **2026-04-16** `8b06b786c977` — 8 breaking, 6 warning, 8 info
  - removed `#/components/schemas/EvaluatorFlags` from the `evaluator/evaluator_revision/anyOf[subschema #1: EvaluatorRevisionFork]/flags` request property `anyOf` list
  - removed `#/components/schemas/EvaluatorFlags` from the `evaluator/evaluator_variant/anyOf[subschema #1: EvaluatorVariantFork]/flags` request property `anyOf` list
  - removed `#/components/schemas/WorkflowFlags` from the `evaluator/workflow_revision/anyOf[subschema #1: WorkflowRevisionFork]/flags` request property `anyOf` list
  - removed `#/components/schemas/WorkflowFlags` from the `evaluator/workflow_variant/anyOf[subschema #1: WorkflowVariantFork]/flags` request property `anyOf` list
  - …18 more
- **2026-02-27** `8fcd55a5a656` — 1 info
  - endpoint added
- **2025-06-27** `e3e84db47198` — 1 breaking
  - api path removed without deprecation

[Change history](https://skmtc.dev/agenta-ai/apis/agenta-api/changes/evaluators/variants/fork/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/c469c2f6cdba/schema)