In Rasa, a custom action is a piece of Python code that you can write to customize the behavior of your chatbot. Custom actions allow you to perform actions such as fetching data from an API, querying a database, or executing any custom logic based on the user's message or the current conversation state.
To create a custom action in Rasa, you need to define a new class that inherits from the Action class provided by Rasa. This class should implement a name() method that returns the name of the action and a run() method that defines the logic of the action. Here's a basic example of a custom action that responds with a fixed message: