Generators use Google's latest generative large language models (LLMs), and prompts that you provide, to generate agent behavior and responses at runtime. The available models are provided by Vertex AI.

A Generator allows you to make a call to an LLM natively from Dialogflow CX without needing to create your own external webhook. You can configure the generator to do anything you would normally ask an LLM to do.

Generators are great at tasks like summarization, parameter extraction, data transformations, and so on, see examples below.


This feature is currently available for agents in any Dialogflow language. Note that the available models may have more restrictive language limitations, see Vertex AI for more.

Understand generator concepts

The Vertex AI documentation contains information that is important to understand when creating generators for Dialogflow:

Define a generator

To create a generator:

  1. Go to the Dialogflow CX Console.
  2. Select your Google Cloud project.
  3. Select the agent.
  4. Click the Manage tab.
  5. Click Generators.
  6. Click Create new.
  7. Enter a descriptive display name for the generator.
  8. Enter the text prompt, model, and controls as described in concepts.
  9. Click Save.

The text prompt is sent to the generative model during fulfillment at runtime. It should be a clear question or request in order for the model to generate a satisfactory response.

You can make the prompt contextual by marking words as placeholders by adding a $ before the word. You can later associate these generator prompt placeholders with session parameters in fulfillment and they are replaced by the session parameter values during execution.

Define a generator
Define a generator

There are special generator prompt placeholders that do not need to be associated with session parameters. These built-in generator prompt placeholders are

Term Definition
$conversation The conversation between the agent and the user, excluding the very last user utterance.
$last-user-utterance The last user utterance.

Use a generator in fulfillment

You can use generators during fulfillment (in Routes, Event-handlers, Parameters and more).

Go to the Generators section of the Fulfillment pane and expand it. Then, click Add generator. Now you can select a predefined generator or define a new generator in place.

After selecting a generator, you need to associate the generator prompt placeholders of the prompt with session parameters. Moreover, you need to define the output parameter that will contain the result of the generator after execution.

Use a generator
Use the generator in fulfillment

Note that you can add several generators in one fulfillment, which are executed in parallel.

The output parameter can then be used later on, for example in the agent response.

Use generator output
Use the output of the generator

Test a generator

The generator feature can be directly tested in the simulator.

Test generator in simulator
Test the generator in simulator


This section provides example use cases for generators.

Content summarization

This example shows how to summarize content.


Your goal is to summarize a given text.


A concise summary of the text in 1 or 2 sentences is:

Conversation summarization

This example shows how to provide a conversation summary. Note how we can explicitly specify the prefixes of the conversation turns in the conversation history and add the $last-user-utterance because it is not included in $conversation.


Your goal is to summarize a given conversation between a Human and an AI.

${conversation USER:"Human:" AGENT:"AI:"}Human: $last-user-utterance

A concise summary of the conversation in 1 or 2 sentences is:

Resolved prompt:

For an example conversation, the resolved prompt that is sent to the generative model could be:

Your goal is to summarize a given conversation between a Human and an AI.

AI: Good day! What can I do for you today?
Human: Hi, which models can I use in Dialogflow's generators?
AI: You can use all models that Vertex AI provides!
Human: Thanks, thats amazing!

A concise summary of the conversation in 1 or 2 sentences is:

Markdown formatting

This example shows how to format text in markdown.

# Instructions

You are presented with a text and your goal is to apply markdown formatting to text.

**NOTE:** Do not change the meaning of the text, only the formatting.

# Example

## Text

Generators allow you to use Googles latest generative models to format text,
or to create a summaries, or even to write code. What an amazing feature.

## Text in Markdown

*Generators* allow you to use Google's latest generative models to

*   format text
*   create a summaries
*   write code

What an amazing feature.

# Your current task

## Text


## Text in Markdown

Question answering

This series of examples shows how to use generators to answer questions.

First, you can simply rely on the internal knowledge of the generative model to answer the question. Note however, that the model will simply provide an answer based on information that was part of its training data. There is no guarantee that the answer is true or up-to-date.

Prompt for question answering with self-knowledge

Your goal is to politely reply to a human with an answer to their question.

The human asked:

You answer:

Prompt for question answering with provided information

However, if you want the model to answer based on information you provide, you can simply add it to the prompt. This works if there is not too much information you want to provide (e.g. a small restaurant menu or contact information of your company).

# Instructions

Your goal is to politely answer questions about the restaurant menu.
If you cannot answer the question because it is not related to the restaurant
menu or because relevant information is missing from the menu, you politely
decline to answer.

# Restaurant menu:

## Starters
Salat 5$

## Main dishes
Pizza 10$

## Deserts
Ice cream 2$

# Examples

Question: How much is the pizza?
Answer: The pizza is 10$.

Question: I want to order the ice cream.
Answer: We do have ice cream! However, I can only answer questions about the menu.

Question: Do you have spaghetti?
Answer: I'm sorry, we do not have spaghetti on the menu.

# Your current task

Question: $last-user-utterance

Prompt for question answering with dynamic provided information

Often, the information you want the model to base its answer on is too much to simply be pasted into the prompt. In this case you can connect the generator to an information retrieval system like a database or a search engine, to dynamically retrieve the information based on a query. You can simply save the output of that system into a parameter and connect it to a placeholder in the prompt.

# Instructions

Your goal is to politely answer questions based on the provided information.
If you cannot answer the question given the provided information, you plitely
decline to answer.

# Provided information:

Question: $last-user-utterance

Code generation

This example shows how to use a generator to write code! Note that here it makes sense to use a generative model that was specifically trained to generate code.


# Instructions:

Your goal is to write code in a given programming language solving a given problem.

Problem to solve:

Programming language:

# Solution:

Escalation to a human agent

This example shows how to handle escalation to a human agent. The final two instructions in the prompt prevent the model from being too verbose.


# Instructions:

You are a polite customer service agent that handles requests
from users to speak with an operator.

Based on the $last-user-utterance,
respond to the user appropriately about their request to speak with an operator.
Always be polite and assure the user that you
will do your best to help their situation.

Do not ask the user any questions.
Do not ask the user if there is anything you can do to help them.

# Answer:

Search query generation

This example shows how to optimize a Google Search query provided by the user.


# Instructions:

You are an expert at Google Search and using "Google Fu"
to build concise search terms that provide the highest quality results.
A user will provide an example query,
and you will attempt to optimize this to be the best Google Search query possible.

# Example:

User: when was covid-19 first started and where did it originated from?
Agent: covid-19 start origin

# Your task:

User: $text

Customer information retrieval

This example shows how to perform information retrieval and search data provided in string or JSON format. These formats are commonly used by Dialogflow session parameters.


You are a database engineer and specialize in extracting information
from both structured and unstructured data formats like CSV, SQL, JSON,
and also plain text.

Given a $user_db, extract the information requested
by the user from the $last-user-utterance

user_db: {'customer_name': 'Patrick', 'balance': '100'}
User: What is my current account balance?
Agent: Your current balance is 100.


user_db: $user_db
User: $last-user-utterance

Updating a JSON object

This example shows how to accept an input JSON object from the user (or webhook), then manipulate the object based on the user's request.


You are an expert Software Engineer
that specializes in the JSON object data structure.

Given some user $update_request and existing $json_object,
you will modify the $json_object based on the user's $update_request.

json_object = { "a": 1, "b": 123 }
User: Add a new key/value pair to my JSON
Agent: What do you want to add?
User: c: cat
Agent: { "a": 1, "b": 123, "c": "cat"}

json_object = {"accounts": [{"username": "user1", "account_number": 12345}, {"username": "user2", "account_number": 98765}], "timestamp": "2023-05-25", "version":"1.0"}
User: Add a new value for user1
Agent: What do you want to add?
User: birthday, 12/05/1982
Agent: {"accounts": [{"username": "user1", "account_number": 12345, "birthday": "12/05/1982"}, {"username": "user2", "account_number": 98765}], "timestamp": "2023-05-25", "version":"1.0"}

json_object = $json_object
User: Add a new key value to my db
Agent: What do you want to add?
User: $last-user-utterance


Also see the Generators Codelab.