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POST
/
v1
/
evals
/
agents
/
{eval_agent_id}
/
versions
Create Eval Agent Version
curl --request POST \
  --url https://api.bland.ai/v1/evals/agents/{eval_agent_id}/versions \
  --header 'Content-Type: application/json' \
  --header 'authorization: <authorization>' \
  --data '
{
  "name": "<string>",
  "description": {},
  "from_version_id": "<string>"
}
'
import requests

url = "https://api.bland.ai/v1/evals/agents/{eval_agent_id}/versions"

payload = {
"name": "<string>",
"description": {},
"from_version_id": "<string>"
}
headers = {
"authorization": "<authorization>",
"Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)
const options = {
method: 'POST',
headers: {authorization: '<authorization>', 'Content-Type': 'application/json'},
body: JSON.stringify({name: '<string>', description: {}, from_version_id: '<string>'})
};

fetch('https://api.bland.ai/v1/evals/agents/{eval_agent_id}/versions', options)
.then(res => res.json())
.then(res => console.log(res))
.catch(err => console.error(err));
<?php

$curl = curl_init();

curl_setopt_array($curl, [
CURLOPT_URL => "https://api.bland.ai/v1/evals/agents/{eval_agent_id}/versions",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "POST",
CURLOPT_POSTFIELDS => json_encode([
'name' => '<string>',
'description' => [

],
'from_version_id' => '<string>'
]),
CURLOPT_HTTPHEADER => [
"Content-Type: application/json",
"authorization: <authorization>"
],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
echo "cURL Error #:" . $err;
} else {
echo $response;
}
package main

import (
"fmt"
"strings"
"net/http"
"io"
)

func main() {

url := "https://api.bland.ai/v1/evals/agents/{eval_agent_id}/versions"

payload := strings.NewReader("{\n \"name\": \"<string>\",\n \"description\": {},\n \"from_version_id\": \"<string>\"\n}")

req, _ := http.NewRequest("POST", url, payload)

req.Header.Add("authorization", "<authorization>")
req.Header.Add("Content-Type", "application/json")

res, _ := http.DefaultClient.Do(req)

defer res.Body.Close()
body, _ := io.ReadAll(res.Body)

fmt.Println(string(body))

}
HttpResponse<String> response = Unirest.post("https://api.bland.ai/v1/evals/agents/{eval_agent_id}/versions")
.header("authorization", "<authorization>")
.header("Content-Type", "application/json")
.body("{\n \"name\": \"<string>\",\n \"description\": {},\n \"from_version_id\": \"<string>\"\n}")
.asString();
require 'uri'
require 'net/http'

url = URI("https://api.bland.ai/v1/evals/agents/{eval_agent_id}/versions")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["authorization"] = '<authorization>'
request["Content-Type"] = 'application/json'
request.body = "{\n \"name\": \"<string>\",\n \"description\": {},\n \"from_version_id\": \"<string>\"\n}"

response = http.request(request)
puts response.read_body
{
  "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"
  }
}

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.
{
  "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"
  }
}