Validate Prompt

POST /v2/agents/prompt/validate

Validate Prompt

cURL

curl --request POST \
  --url https://api.velt.dev/v2/agents/prompt/validate \
  --header 'Content-Type: application/json' \
  --header 'x-velt-api-key: <x-velt-api-key>' \
  --header 'x-velt-auth-token: <x-velt-auth-token>' \
  --data '
{
  "data": {
    "prompt": "<string>",
    "provider": "<string>",
    "userContextFields": [
      {}
    ]
  }
}
'

import requests

url = "https://api.velt.dev/v2/agents/prompt/validate"

payload = { "data": {
        "prompt": "<string>",
        "provider": "<string>",
        "userContextFields": [{}]
    } }
headers = {
    "x-velt-api-key": "<x-velt-api-key>",
    "x-velt-auth-token": "<x-velt-auth-token>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {
    'x-velt-api-key': '<x-velt-api-key>',
    'x-velt-auth-token': '<x-velt-auth-token>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({data: {prompt: '<string>', provider: '<string>', userContextFields: [{}]}})
};

fetch('https://api.velt.dev/v2/agents/prompt/validate', 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.velt.dev/v2/agents/prompt/validate",
  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([
    'data' => [
        'prompt' => '<string>',
        'provider' => '<string>',
        'userContextFields' => [
                [
                                
                ]
        ]
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "x-velt-api-key: <x-velt-api-key>",
    "x-velt-auth-token: <x-velt-auth-token>"
  ],
]);

$response = curl_exec($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.velt.dev/v2/agents/prompt/validate"

	payload := strings.NewReader("{\n  \"data\": {\n    \"prompt\": \"<string>\",\n    \"provider\": \"<string>\",\n    \"userContextFields\": [\n      {}\n    ]\n  }\n}")

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

	req.Header.Add("x-velt-api-key", "<x-velt-api-key>")
	req.Header.Add("x-velt-auth-token", "<x-velt-auth-token>")
	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.velt.dev/v2/agents/prompt/validate")
  .header("x-velt-api-key", "<x-velt-api-key>")
  .header("x-velt-auth-token", "<x-velt-auth-token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"data\": {\n    \"prompt\": \"<string>\",\n    \"provider\": \"<string>\",\n    \"userContextFields\": [\n      {}\n    ]\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.velt.dev/v2/agents/prompt/validate")

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

request = Net::HTTP::Post.new(url)
request["x-velt-api-key"] = '<x-velt-api-key>'
request["x-velt-auth-token"] = '<x-velt-auth-token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"data\": {\n    \"prompt\": \"<string>\",\n    \"provider\": \"<string>\",\n    \"userContextFields\": [\n      {}\n    ]\n  }\n}"

response = http.request(request)
puts response.read_body

{
  "result": {
    "status": "success",
    "message": "Prompt validated successfully",
    "data": {
      "validationResult": {
        "analysis_prompt": "## Objective\n...",
        "requires_tool": "NONE",
        "response_descriptions": {},
        "demos": {},
        "suggested_required_inputs": []
      }
    }
  }
}

Use this API to expand a simple instruction into a structured QA task with an analysis prompt, tool requirements, response descriptions, and demo examples. This is the transformation step that turns a one-line instruction into a comprehensive QA task definition you can ship as an agent.

Endpoint

POST https://api.velt.dev/v2/agents/prompt/validate

Headers

x-velt-api-key · string · required

Your API key.

x-velt-auth-token · string · required

Your Auth Token.

Body

Params

data · object · required

Show properties

prompt · string · required

Min 1 char. The user’s simple instruction to expand.

provider · string

LLM provider override: "gemini" or "claude".

userContextFields · object[]

Optional declared user-context fields. Each entry: { id, title, type, example?, defaultValue? }.

Example Requests

1. Broken links

{
  "data": {
    "prompt": "Make sure there are no broken links on the page"
  }
}

2. Accessibility check

{
  "data": {
    "prompt": "Check all images have alt text and all form inputs have labels"
  }
}

Response

The validationResult object maps to the PromptValidatorResult interface.

Success Response

{
  "result": {
    "status": "success",
    "message": "Prompt validated successfully",
    "data": {
      "validationResult": {
        "analysis_prompt": "## Objective\nIdentify all broken or non-functional hyperlinks on the page\n\n## Scope\nAll anchor elements (<a href>) and embedded resource URLs\n\n## Detection Logic\nHTTP HEAD/GET validation of link targets, checking for non-2xx status codes\n\n## Output Format\nList of broken links with source element, target URL, and HTTP status",
        "requires_tool": "TOOL_TEXT_EXTRACTOR",
        "response_descriptions": {
          "title": "Brief description of the broken link",
          "severity": "critical for 5xx errors, high for 4xx, medium for timeouts, low for redirects",
          "targetText": "The anchor text of the broken link",
          "suggestion": "The correct URL or action to fix the broken link",
          "issueType": "broken-link"
        },
        "demos": {
          "detection_dimensions": ["Link targets", "HTTP status codes", "Redirect chains"],
          "cases": [
            {
              "id": "demo-1",
              "title": "Broken link to documentation",
              "tier": "obvious_match",
              "dimension_tested": "HTTP status codes: 404",
              "html": "<a href=\"https://docs.example.com/api\">API Reference</a>",
              "expected": "detected",
              "reason": "Link returns 404 Not Found"
            }
          ]
        },
        "suggested_required_inputs": []
      }
    }
  }
}

Response fields (PromptValidatorResult):

Field	Type	Description
analysis_prompt	string	Markdown-formatted QA analysis prompt (objective, scope, detection logic, output format).
requires_tool	string	"TOOL_TEXT_EXTRACTOR" or "NONE".
response_descriptions	object	Per-field descriptions for AI response shaping.
demos	object	Demo test cases with detection dimensions and tiered cases.
suggested_required_inputs	object[]	Runtime-dependent fields the user must provide at execution time.

Failure Response

{
  "error": {
    "message": "ERROR_MESSAGE",
    "status": "INVALID_ARGUMENT"
  }
}

Errors: INVALID_ARGUMENT (missing or empty prompt).

{
  "result": {
    "status": "success",
    "message": "Prompt validated successfully",
    "data": {
      "validationResult": {
        "analysis_prompt": "## Objective\n...",
        "requires_tool": "NONE",
        "response_descriptions": {},
        "demos": {},
        "suggested_required_inputs": []
      }
    }
  }
}