AI Tools

AI Prompt A/B Variant Generator

Generate controlled A/B variants of a prompt across the persona, tone/style, output format, and constraints dimensions, then compare them side by side with a heuristic rubric score and a word-level diff against the baseline. A reproducible way to test how a prompt behaves under different framings before picking one for production.

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Quick start

Call this tool from your code in three languages.

cURL

curl -X POST 'https://api.elysiatools.com/en/api/tools/ai-prompt-ab-variant-generator' \
  -H 'Content-Type: application/json' \
  -d '{"basePrompt":"Summarize the attached research paper for a busy product manager. Focus on what changed and why it matters.","dimensions":["persona","tone","format"],"count":4,"renderMode":"cards","temperature":0.5,"useAi":false}'

API reference

Send a POST request with your inputs as JSON. File parameters require a separate upload first.

Endpoint

HTTP

POST https://api.elysiatools.com/en/api/tools/ai-prompt-ab-variant-generator

Parameters

Name	Type	Required	Description
basePrompt	textarea	Yes	The prompt whose variants you want to generate. Its task intent is preserved across variants.
dimensions	select	No	Which axes to vary. Defaults to persona, tone, and format.
count	number	Yes	How many variants to generate, including baseline A.
renderMode	select	No	—
temperature	number	No

MCP integration

Add this tool to your Model Context Protocol server so AI agents can list and call it.

Server configuration

Add this block to your MCP client configuration:

mcp.json

{
  "mcpServers": {
    "elysiatools-ai-prompt-ab-variant-generator": {
      "name": "ai-prompt-ab-variant-generator",
      "description": "Generate controlled A/B variants of a prompt across the persona, tone/style, output format, and constraints dimensions, then compare them side by side with a heuristic rubric score and a word-level diff against the baseline. A reproducible way to test how a prompt behaves under different framings before picking one for production.",
      "baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=ai-prompt-ab-variant-generator",
      "command": "",
      "args": [],
      "env": {},
      "isActive": true,
      "type": "sse"
    }
  }
}

List available tools

After connecting to the SSE endpoint, list the exposed tools:

tools/list

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/list"
}

Call this tool

Invoke the tool by its id, passing arguments built from its parameters:

tools/call

{
  "jsonrpc": "2.0",
  "id": 2,
  "method": "tools/call",
  "params": {
    "name": "ai-prompt-ab-variant-generator",
    "arguments": {
  "basePrompt": "Summarize the attached research paper for a busy product manager. Focus on what changed and why it matters.",
  "dimensions": [
    "persona",
    "tone",
    "format"
  ],
  "count": 4,
  "renderMode": "cards",
  "temperature": 0.5,
  "useAi": false
}
  }
}

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