---
title: "Function tool"
url: "https://kongair.terwilligar.com/apis/openai-api-2-3-0/versions/ea92d048-c746-4ead-a6a8-da28d93137d1/schemas/AssistantToolsFunction"
---

> Full API specification: https://kongair.terwilligar.com/apis/openai-api-2-3-0/versions/ea92d048-c746-4ead-a6a8-da28d93137d1.md

# Function tool

## OpenAPI definition

```yaml
openapi: 3.0.0
info:
  title: OpenAI API
  version: 2.3.0
servers:
  - url: https://api.openai.com/v1
components:
  schemas:
    FunctionObject:
      type: object
      properties:
        description:
          type: string
          description: A description of what the function does, used by the model to
            choose when and how to call the function.
        name:
          type: string
          description: The name of the function to be called. Must be a-z, A-Z, 0-9, or
            contain underscores and dashes, with a maximum length of 64.
        parameters:
          $ref: "#/components/schemas/FunctionParameters"
        strict:
          type: boolean
          nullable: true
          default: false
          description: Whether to enable strict schema adherence when generating the
            function call. If set to true, the model will follow the exact
            schema defined in the `parameters` field. Only a subset of JSON
            Schema is supported when `strict` is `true`. Learn more about
            Structured Outputs in the [function calling
            guide](docs/guides/function-calling).
      required:
        - name
    FunctionParameters:
      type: object
      description: >-
        The parameters the functions accepts, described as a JSON Schema object.
        See the [guide](/docs/guides/function-calling) for examples, and the
        [JSON Schema
        reference](https://json-schema.org/understanding-json-schema/) for
        documentation about the format. 


        Omitting `parameters` defines a function with an empty parameter list.
      additionalProperties: true
    AssistantToolsFunction:
      type: object
      title: Function tool
      properties:
        type:
          type: string
          description: "The type of tool being defined: `function`"
          enum:
            - function
          x-stainless-const: true
        function:
          $ref: "#/components/schemas/FunctionObject"
      required:
        - type
        - function
```