> ## Documentation Index
> Fetch the complete documentation index at: https://docs.bland.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Create Eval Agent Version

> Fork a new editable draft version of an eval agent.

### Headers

**authorization** `string` *required*

Your API key for authentication.

### Path Parameters

**eval\_agent\_id** `string` *required*

The unique identifier of the eval agent.

### Body Parameters

**name** `string`

Display name for the new version. Between 1 and 200 characters.

**description** `string | null`

Optional description for the new version.

**from\_version\_id** `string`

ID of the version to fork from. Defaults to the current draft if not provided.

### Response

**data.id** `string`

Unique identifier for the new version.

**data.org\_id** `string`

ID of the organization that owns this version.

**data.eval\_agent\_id** `string`

ID of the parent eval agent.

**data.version\_number** `integer`

Sequential version number assigned to the new draft.

**data.name** `string`

Name of the new version.

**data.description** `string | null`

Description of the new version, or `null`.

**data.state** `string`

Always `"editable"` for a newly forked draft.

**data.modality** `string`

One of `text` or `audio`, inherited from the source version.

**data.system\_prompt\_md** `string`

The system prompt for the judge LLM, in Markdown.

**data.prompt\_md** `string`

The grading prompt for the judge LLM, in Markdown.

**data.levels** `array of objects`

Verdict levels copied from the source version. Each level contains `level_key`, `label`, `prompt_md`, and optionally `color`.

**data.target\_level\_keys** `array of strings`

Target level keys copied from the source version.

**data.weight** `number`

Relative weight copied from the source version. Between 0 and 100.

**data.created\_from\_version\_id** `string | null`

ID of the version this was forked from.

**data.created\_by** `string | null`

Identifier of the user who created this version, or `null`.

**data.created\_at** `string`

ISO 8601 timestamp for when this version was created.

**data.updated\_at** `string`

ISO 8601 timestamp for when this version was last updated.

```json Response theme={null}
{
  "errors": null,
  "data": {
    "id": "e5f6a7b8-c9d0-1234-efab-567890123456",
    "org_id": "f0e1d2c3-b4a5-9678-fedc-ba9876543210",
    "eval_agent_id": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
    "version_number": 4,
    "name": "Empathy Check v4",
    "description": null,
    "state": "editable",
    "modality": "audio",
    "system_prompt_md": "You are an expert call quality reviewer.",
    "prompt_md": "Did the agent express empathy when the caller described their problem?",
    "levels": [
      {
        "level_key": "excellent",
        "label": "Excellent",
        "prompt_md": "The agent clearly and warmly acknowledged the caller's feelings.",
        "color": "emerald"
      },
      {
        "level_key": "poor",
        "label": "Poor",
        "prompt_md": "The agent ignored or dismissed the caller's feelings.",
        "color": "rose"
      }
    ],
    "target_level_keys": ["excellent"],
    "weight": 10,
    "created_from_version_id": "b2c3d4e5-f6a7-8901-bcde-f12345678901",
    "created_by": "9a8b7c6d-5e4f-3210-9876-543210fedcba",
    "created_at": "2026-05-27T11:30:00.000Z",
    "updated_at": "2026-05-27T11:30:00.000Z"
  }
}
```


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