> ## Documentation Index
> Fetch the complete documentation index at: https://docs.innochat.ch/llms.txt
> Use this file to discover all available pages before exploring further.

# Introduction

> This introduction explains how to use INNOCHAT tool functions with function calling, create your own API keys, and integrate frequently used tools such as the Weekday Service. Learn how to integrate APIs, set up authentication correctly, and efficiently expand your chatbot functions.

When using [function calling](/rag-from-external-data-provider), you generally need to use publically available APIs - or make your own. However, we also host a number of commonly-used tool functions on our own site, tools.innochat.ch. More are being added every day, so watch this space!

If you would like to suggest a function for us to add, please let us know! You can email us at [hello@innochat.ch](mailto:hello@innochat.ch).

In order to use these tool functions, you must first create your own INNOCHAT API key. For details, please see [Getting a INNOCHAT API Key](/api-reference/api-key-setup).

Our current tool functions are:

<CardGroup cols={2}>
  <Card title="weekday" icon="calendar" href="/tools/weekday">
    Get the day of the week for a given date
  </Card>

  <Card title="Coming soon" icon="question">
    Under construction!
  </Card>
</CardGroup>

## Usage

In each tool function's individual page, the description and parameters of the tool are provided. These can be used directly when creating a function in your agent. For example, the settings in the image below are taken directly from the [Weekday](/tools/weekday) page.

<Frame>
  <img src="https://mintcdn.com/innoq/9CizSgZikx55e9_4/images/tools-intro-1.png?fit=max&auto=format&n=9CizSgZikx55e9_4&q=85&s=a8723eb15cf297712e8d150777abadcd" width="1296" height="1304" data-path="images/tools-intro-1.png" />

  <img src="https://mintcdn.com/innoq/9CizSgZikx55e9_4/images/tools-intro-2.png?fit=max&auto=format&n=9CizSgZikx55e9_4&q=85&s=0201db9df284b8977ac5680983b764a3" width="1282" height="1190" data-path="images/tools-intro-2.png" />
</Frame>

For the "Headers" section of the form, you will want to enter the INNOCHAT API key you created earlier, like so:

```json theme={null}
{
  "Authorization": "Bearer Your-INNOCHAT-API-key-here"
}
```

<Warning>
  You must replace *Your-INNOCHAT-API-key-here* with your own API key. The
  tool function will not work otherwise.
</Warning>

And then, just click "Save", and you should be all set!