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API Contract Stress Tester

Generate boundary-value test cases from an OpenAPI 3.x document and optionally send them to a real backend to spot contract mismatches

json· JSON resultOpen tool

Quick start

Call this tool from your code in three languages.

cURL
curl -X POST 'https://api.elysiatools.com/en/api/tools/api-contract-stress-tester' \
  -H 'Content-Type: application/json' \
  -d '{"openApiSpec":"openapi: 3.0.0\npaths:\n  /users:\n    post:\n      requestBody:\n        required: true\n        content:\n          application/json:\n            schema:\n              type: object\n              required: [email, role]\n              properties:\n                email: { type: string, minLength: 5 }\n                role: { type: string, enum: [admin, member] }\n                age: { type: integer, minimum: 18 }\n      responses:\n        \"201\": { description: created }\n        \"400\": { description: bad request }\n","baseUrl":"https://api.example.com","executeRequests":false,"authorizationHeader":"Bearer <token>","maxCasesPerField":3,"timeoutMs":8000}'

© 2026 Elysia Tools. Developer documentation.

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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/api-contract-stress-tester

Parameters

NameTypeRequiredDescription
openApiSpectextareaYes—
baseUrltextNo—
executeRequestscheckboxNo—
authorizationHeadertextNo—
maxCasesPerFieldnumberNo—
timeoutMsnumberNo—

Response format

JSON result

JSON
{
  "key": {...},
  "metadata": {
    "key": "value"
  },
  "error": "Error message (optional)",
  "message": "Notification message (optional)"
}

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-api-contract-stress-tester": {
      "name": "api-contract-stress-tester",
      "description": "Generate boundary-value test cases from an OpenAPI 3.x document and optionally send them to a real backend to spot contract mismatches",
      "baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=api-contract-stress-tester",
      "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": "api-contract-stress-tester",
    "arguments": {
  "openApiSpec": "openapi: 3.0.0\npaths:\n  /users:\n    post:\n      requestBody:\n        required: true\n        content:\n          application/json:\n            schema:\n              type: object\n              required: [email, role]\n              properties:\n                email: { type: string, minLength: 5 }\n                role: { type: string, enum: [admin, member] }\n                age: { type: integer, minimum: 18 }\n      responses:\n        \"201\": { description: created }\n        \"400\": { description: bad request }\n",
  "baseUrl": "https://api.example.com",
  "executeRequests": false,
  "authorizationHeader": "Bearer <token>",
  "maxCasesPerField": 3,
  "timeoutMs": 8000
}
  }
}
Chain multiple tools in one session with a comma-separated toolId list, e.g. /mcp/sse?toolId=png-to-webp,jpg-to-webp,gif-to-webp (max 20).

Questions or issues? Contact [email protected]

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