TTULAKITO
AI

Function Calling Builder

Convert a JSON schema into OpenAI and Anthropic tool-call specs.

All tools

Function

JSON Schema (parameters)

OpenAI tool spec

{
  "type": "function",
  "function": {
    "name": "get_weather",
    "description": "Get the current weather for a city",
    "parameters": {
      "type": "object",
      "properties": {
        "location": {
          "type": "string",
          "description": "City name, e.g. Paris"
        },
        "units": {
          "type": "string",
          "enum": [
            "celsius",
            "fahrenheit"
          ]
        }
      },
      "required": [
        "location"
      ]
    }
  }
}

Frequently asked questions

Is Function Calling Builder free to use?
Yes. Function Calling Builder is part of TULAKITO's collection of free browser tools. No signup, no subscription, no usage limits.
Is my data safe with Function Calling Builder?
Yes. Function Calling Builder runs entirely in your browser. Nothing you type, paste, or upload is sent to any server.
Do I need to install anything?
No. Function Calling Builder works directly in your browser on desktop and mobile — no downloads or extensions required.