---
title: "Create Experiment"
method: POST
path: "/api/v1/agents/{agent_id}/experiments"
tags: ["experiments"]
---

# Create Experiment

`POST /api/v1/agents/{agent_id}/experiments`

Open a round. Starts assigning immediately.

## Path parameters

- `agent_id` string, uuid, required

## Headers

- `authorization` string, nullable — Bearer <token>

## Request body

- ExperimentCreate
  - `name` string, required
  - `variants` VariantCreate[], required
    - `key` string, required
    - `name` string, required
    - `is_control` boolean
    - `weight` integer, required
    - `patch` object
    - `holdout` boolean
  - `varies` string[]
  - `window_hours` integer, nullable
  - `notes` string, nullable
  - `parent_experiment_id` string, uuid, nullable

## Response `201`

Successful Response

- EnvelopeExperimentResponse
  - `data` ExperimentResponse, required
    - `id` string, uuid, required
    - `agent_id` string, uuid, required
    - `name` string, required
    - `status` string, required
    - `varies` string[], nullable, required
    - `window_hours` integer, required
    - `base_config` object, nullable, required
    - `started_at` string, date-time, nullable, required
    - `ended_at` string, date-time, nullable, required
    - `promoted_variant_id` string, uuid, nullable, required
    - `parent_experiment_id` string, uuid, nullable, required
    - `notes` string, nullable, required
    - `created_at` string, date-time, required
  - `meta` Meta
    - `request_id` string
    - `timestamp` string, date-time
    - `total` integer, nullable
    - `truncated` boolean, nullable

## Other responses

- `422` — Validation Error

---

[API](https://skmtc.dev/minro/apis/minro-cs-platform.md) · [All operations](https://skmtc.dev/minro/apis/minro-cs-platform/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/minro/minro-cs-platform/revisions/eb854265cf29/schema)