Developer Tool

OpenAI Function Schema Builder

Quickly build, edit, and export OpenAI function schemas with a simple, intuitive interface built to streamline your development workflow.

Each tool has type: "function" at the top level
Function properties (name, description, parameters) are at the same level as type
Parameters use JSON Schema format with type definitions
Use additionalProperties: false for strict validation
Mark required parameters to ensure they're included in calls
Supports nested objects and arrays with complex structures

Build Your Functions

Import

No functions added yet

Click "Add Function" to start.

{
  "type": "function",
  "name": "get_weather",
  "description": "Get current temperature...",
  "parameters": { ... }
}

Tips:

Edit the JSON schema directly and click the save icon to update the visual builder
The type: "function" field is automatically included for OpenAI compatibility
Use "Strict Mode" for higher reliability with newer models
Test your schema using the tool below

Test your function schema with a sample call. The test data should be in the format:

⚠️ No functions added yet. Click "Add Function" to start building your schema.

YourGPT can import and learn from your function schemas and JSON data to create an intelligent chatbot that knows your business.