# Kili Tutorial: How to chain annotation projects with webhooks on Kili

In this tutorial, we will show how to use webhooks to monitor actions in Kili, such as a label creation. The goal of this tutorial is to illustrate some basic components and concepts of Kili in a simple way, but also to dive into the actual process of iteratively developing real applications in Kili.

For an overview of Kili, visit kili-technology.com You can also check out the Kili documentation https://cloud.kili-technology.com/docs. Our goal is to export labels that can predict whether an image contains a Porsche or a Tesla.

The tutorial is divided into two parts:

1. Why use webhooks?
2. Using Kili’s webhook in Python

## 1. Why use webhooks?

Webhooks allow to react to particular action in Kili’s database by triggering a callback whenever an action is completed. For instance, here, every time a label is created in frontend (upper panel), the label can be logged in Python (lower right panel):

from IPython.display import Image
with open('https://raw.githubusercontent.com/kili-technology/kili-playground/e8623b9a6e1de273da6494b5cb1c89f7b8005a9a/recipes/img/websockets.gif','rb') as f:


## 2. Using Kili’s webhook in Python

Kili Playground exposes a method label_created_or_updated that allows to listen for all actions on labels:

• creation of a new label
• update of an existing label

First of all, you need to authenticate:

import os

!pip install kili
from kili.authentication import KiliAuth
from kili.playground import Playground

email = os.getenv('KILI_EMAIL')
api_endpoint = 'https://cloud.kili-technology.com/api/label/graphql'

playground = Playground(kauth)


Then you can define a callback that will be triggered each time a label gets created/updated:

project_id = 'CHANGE_ME_FOR_YOUR_PROJECT_ID'

def callback(id, data):
print(f'New data: {data}\n')

playground.label_created_or_updated(
project_id=project_id, callback=callback)


## Summary

In this tutorial, we accomplished the following:

We introduced the concept of webhook and we used label_created_or_updated to trigger a webhook.

You can also visit the Kili website or Kili documentation for more info!

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