---
title: "Create a harness"
method: POST
path: "/v1/harnesses"
---

# Create a harness

`POST /v1/harnesses`

## Request

- Base URL: `https://api.harnessrouter.ai`
- URL: `https://api.harnessrouter.ai/v1/harnesses`
- Auth: none declared

## Request body

- HarnessBody
  - `name` string, required
  - `base` string, required
  - `base_label` string, nullable
  - `default_model` string, nullable
  - `system_prompt` string, nullable
  - `mcp_servers` unknown[], nullable
    - unknown
  - `skills` unknown[], nullable
    - unknown
  - `plugins` unknown[], nullable
    - unknown
  - `disabled_tools` unknown[], nullable
    - unknown
  - `max_step` integer, nullable
  - `timeout_seconds` integer, nullable
  - `max_cost_usd` number, nullable
  - `reasoning_effort` string, nullable
  - `engine_member` object, nullable
  - `additional_headers` unknown[], nullable
    - unknown
  - `env` object, nullable
  - `source` string, nullable
  - `source_instance` string, nullable
  - `environment` string, nullable

## Response `200`

Successful Response

- object

## Other responses

- `422`: Validation Error

---

[API](https://skmtc.dev/harnessrouter/apis/harnessrouter-api.md) - [All operations](https://skmtc.dev/harnessrouter/apis/harnessrouter-api/llms.txt) - [OpenAPI document](https://skmtc.dev/harnessrouter/apis/harnessrouter-api/revisions/a02863eb5a8f?raw)