Version: Latest


The configuration file defines the components and policies that your model will use to make predictions based on user input.

You can customise many aspects of how Rasa works by modifying the config.yml file.

A minimal configuration for a CALM assistant looks like this:

recipe: default.v1
language: en
assistant_id: 20230405-114328-tranquil-mustard
- name: LLMCommandGenerator
- name: rasa.core.policies.flow_policy.FlowPolicy
Default Configuration

For backwards compatibility, running rasa init will create an NLU-based assistant. To create a CALM assistant with the right config.yml, add the additional --template argument:

rasa init --template calm

The recipe, language, and assistant_id keys

The recipe key only needs to be modified if you want to use a custom graph recipe. The vast majority of projects should use the default value "default.v1".

The language key is a 2-letter ISO code for the language your assistant supports.

The assistant_id key should be a unique value and allows you to distinguish multiple deployed assistants. This id is added to each event's metadata, together with the model id. See event brokers for more information. Note that if the config file does not include this required key or the placeholder default value is not replaced, a random assistant name will be generated and added to the configuration every time you run rasa train.


The pipeline key lists the components which will be used to process and understand the messages that end users send to your assistant. In a CALM assistant, the output of your components pipeline is a list of commands.

The main component in your pipeline is the LLMCommandGenerator. Here is what an example configuration looks like:

- name: LLMCommandGenerator
model_name: "gpt-4"
request_timeout: 7
temperature: 0.0
max_characters: 420

The full set of configurable parameters is listed here.

All components which make use of LLMs have common configuration parameters which are listed here


The policies key lists the dialogue policies your assistant will use to progress the conversation.

- name: rasa.core.policies.flow_policy.FlowPolicy

The FlowPolicy currently doesn't have an additional configuration parameters.