pipecat-flows

Open source conversation framework and visual editor for structured Pipecat dialogues

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Pipecat Flows is a framework designed for building structured conversations in AI applications. It allows users to create both predefined conversation paths and dynamically generated flows, handling state management and LLM interactions. The framework includes a Python module for building conversation flows and a visual editor for designing and exporting flow configurations. Pipecat Flows is suitable for scenarios such as customer service scripts, intake forms, personalized experiences, and complex decision trees.

README:

Pipecat Flows provides a framework for building structured conversations in your AI applications. It enables you to create both predefined conversation paths and dynamically generated flows while handling the complexities of state management and LLM interactions.

The framework consists of:

A Python module for building conversation flows with Pipecat
A visual editor for designing and exporting flow configurations

When to Use Pipecat Flows

Static Flows: When your conversation structure is known upfront and follows predefined paths. Perfect for customer service scripts, intake forms, or guided experiences.
Dynamic Flows: When conversation paths need to be determined at runtime based on user input, external data, or business logic. Ideal for personalized experiences or complex decision trees.

Installation

If you're already using Pipecat:

pip install pipecat-ai-flows

If you're starting fresh:

# Basic installation
pip install pipecat-ai-flows

# Install Pipecat with specific LLM provider options:
pip install "pipecat-ai[daily,openai,deepgram,cartesia]"     # For OpenAI
pip install "pipecat-ai[daily,anthropic,deepgram,cartesia]"  # For Anthropic
pip install "pipecat-ai[daily,google,deepgram,cartesia]"     # For Google

Quick Start

Here's a basic example of setting up a static conversation flow:

from pipecat_flows import FlowManager

# Initialize flow manager with static configuration
flow_manager = FlowManager(task, llm, tts, flow_config=flow_config)

@transport.event_handler("on_first_participant_joined")
async def on_first_participant_joined(transport, participant):
    await transport.capture_participant_transcription(participant["id"])
    await flow_manager.initialize()
    await task.queue_frames([context_aggregator.user().get_context_frame()])

For more detailed examples and guides, visit our documentation.

Core Concepts

Flow Configuration

Each conversation flow consists of nodes that define the conversation structure. A node includes:

Messages

Nodes use two types of messages to control the conversation:

Role Messages: Define the bot's personality or role (optional)

"role_messages": [
    {
        "role": "system",
        "content": "You are a friendly pizza ordering assistant. Keep responses casual and upbeat."
    }
]

Task Messages: Define what the bot should do in the current node

"task_messages": [
    {
        "role": "system",
        "content": "Ask the customer which pizza size they'd like: small, medium, or large."
    }
]

Role messages are typically defined in your initial node and inherited by subsequent nodes, while task messages are specific to each node's purpose.

Functions

Functions come in two types:

Node Functions: Execute operations within the current state

{
    "type": "function",
    "function": {
        "name": "select_size",
        "handler": select_size_handler,
        "description": "Select pizza size",
        "parameters": {
            "type": "object",
            "properties": {
                "size": {"type": "string", "enum": ["small", "medium", "large"]}
            }
        },
    }
}

Edge Functions: Create transitions between states

{
    "type": "function",
    "function": {
        "name": "next_step",
        "handler": select_size_handler, # Optional handler
        "description": "Move to next state",
        "parameters": {"type": "object", "properties": {}},
        "transition_to": "target_node"  # Required: Specify target node
    }
}

Functions can:

Have a handler (for data processing)
Have a transition_to (for state changes)
Have both (process data and transition)
Have neither (end node functions)

Actions

There are two types of actions available:

pre_actions: Run before the LLM inference. For long function calls, you can use a pre_action for the TTS to say something, like "Hold on a moment..."
post_actions: Run after the LLM inference. This is handy for actions like ending or transferring a call.

"pre_actions": [
    {
        "type": "tts_say",
        "text": "Processing your order..."
    }
],
"post_actions": [
    {
        "type": "end_conversation"
    }
]

Learn more about built-in actions and defining your own action in the docs.

Provider-Specific Formats

Pipecat Flows automatically handles format differences between LLM providers:

OpenAI Format

"functions": [{
    "type": "function",
    "function": {
        "name": "function_name",
        "description": "description",
        "parameters": {...}
    }
}]

Anthropic Format

"functions": [{
    "name": "function_name",
    "description": "description",
    "input_schema": {...}
}]

Google (Gemini) Format

"functions": [{
    "function_declarations": [{
        "name": "function_name",
        "description": "description",
        "parameters": {...}
    }]
}]

Flow Management

The FlowManager handles both static and dynamic flows through a unified interface:

Static Flows

# Define flow configuration upfront
flow_config = {
    "initial_node": "greeting",
    "nodes": {
        "greeting": {
            "role_messages": [
                {
                    "role": "system",
                    "content": "You are a helpful assistant. Your responses will be converted to audio."
                }
            ],
            "task_messages": [
                {
                    "role": "system",
                    "content": "Start by greeting the user and asking for their name."
                }
            ],
            "functions": [{
                "type": "function",
                "function": {
                    "name": "collect_name",
                    "description": "Record user's name",
                    "parameters": {...},
                    "handler": collect_name_handler,     # Specify handler
                    "transition_to": "next_step"         # Specify transition
                }
            }]
        }
    }
}

# Create and initialize the FlowManager
flow_manager = FlowManager(task, llm, tts, flow_config=flow_config)
await flow_manager.initialize()

Dynamic Flows

def create_initial_node() -> NodeConfig:
    return {
        "role_messages": [
            {
                "role": "system",
                "content": "You are a helpful assistant."
            }
        ],
        "task_messages": [
            {
                "role": "system",
                "content": "Ask the user for their age."
            }
        ],
        "functions": [
            {
                "type": "function",
                "function": {
                    "name": "collect_age",
                    "handler": collect_age,
                    "description": "Record user's age",
                    "parameters": {
                        "type": "object",
                        "properties": {
                            "age": {"type": "integer"}
                        },
                        "required": ["age"]
                    }
                }
            }
        ]
    }

# Initialize with transition callback
flow_manager = FlowManager(task, llm, tts, transition_callback=handle_transitions)
await flow_manager.initialize()

@transport.event_handler("on_first_participant_joined")
async def on_first_participant_joined(transport, participant):
    await transport.capture_participant_transcription(participant["id"])
    await flow_manager.initialize()
    await flow_manager.set_node("initial", create_initial_node())
    await task.queue_frames([context_aggregator.user().get_context_frame()])

Examples

The repository includes several complete example implementations in the examples/ directory.

Static

In the examples/static directory, you'll find these examples:

food_ordering.py - A restaurant order flow demonstrating node and edge functions
movie_explorer_openai.py - Movie information bot demonstrating real API integration with TMDB
movie_explorer_anthropic.py - The same movie information demo adapted for Anthropic's format
movie_explorer_gemini.py - The same movie explorer demo adapted for Google Gemini's format
patient_intake.py - A medical intake system showing complex state management
restaurant_reservation.py - A reservation system with availability checking
travel_planner.py - A vacation planning assistant with parallel paths

Dynamic

In the examples/dynamic directory, you'll find these examples:

insurance_openai.py - An insurance quote system using OpenAI's format
insurance_anthropic.py - The same insurance system adapted for Anthropic's format
insurance_gemini.py - The insurance system implemented with Google's format

Each LLM provider (OpenAI, Anthropic, Google) has slightly different function calling formats, but Pipecat Flows handles these differences internally while maintaining a consistent API for developers.

To run these examples:

Setup Virtual Environment (recommended):

python3 -m venv venv
source venv/bin/activate

Installation:

Install the package in development mode:

pip install -e .

Install Pipecat with required options for examples:

pip install "pipecat-ai[daily,openai,deepgram,cartesia,silero,examples]"

If you're running Google or Anthropic examples, you will need to update the installed options. For example:

# Install Google Gemini
pip install "pipecat-ai[daily,google,deepgram,cartesia,silero,examples]"
# Install Anthropic
pip install "pipecat-ai[daily,anthropic,deepgram,cartesia,silero,examples]"

Configuration:

Copy env.example to .env in the examples directory:
```
cp env.example .env
```
Add your API keys and configuration:
- DEEPGRAM_API_KEY
- CARTESIA_API_KEY
- OPENAI_API_KEY
- ANTHROPIC_API_KEY
- GOOGLE_API_KEY
- DAILY_API_KEY
Looking for a Daily API key and room URL? Sign up on the Daily Dashboard.

Running:

python examples/static/food_ordering.py -u YOUR_DAILY_ROOM_URL

Tests

The package includes a comprehensive test suite covering the core functionality.

Setup Test Environment

Create Virtual Environment:

python3 -m venv venv
source venv/bin/activate  # On Windows: venv\Scripts\activate

Install Test Dependencies:

pip install -r dev-requirements.txt -r test-requirements.txt
pip install "pipecat-ai[google,openai,anthropic]"
pip install -e .

Running Tests

Run all tests:

pytest tests/

Run specific test file:

pytest tests/test_state.py

Run specific test:

pytest tests/test_state.py -k test_initialization

Run with coverage report:

pytest tests/ --cov=pipecat_flows

Pipecat Flows Editor

A visual editor for creating and managing Pipecat conversation flows.

Features

Visual flow creation and editing
Import/export of flow configurations
Support for node and edge functions
Merge node support for complex flows
Real-time validation

Naming Conventions

While the underlying system is flexible with node naming, the editor follows these conventions for clarity:

Start Node: Named after your initial conversation state (e.g., "greeting", "welcome")
End Node: Conventionally named "end" for clarity, though other names are supported
Flow Nodes: Named to reflect their purpose in the conversation (e.g., "get_time", "confirm_order")

These conventions help maintain readable and maintainable flows while preserving technical flexibility.

Online Editor

The editor is available online at flows.pipecat.ai.

Local Development

Prerequisites

Node.js (v14 or higher)
npm (v6 or higher)

Installation

Clone the repository

git clone [email protected]:pipecat-ai/pipecat-flows.git

Navigate to project directory

cd pipecat-flows/editor

Install dependencies

npm install

Start development server

npm run dev

Open the page in your browser: http://localhost:5173.

Usage

Create a new flow using the toolbar buttons
Add nodes by right-clicking in the canvas
- Start nodes can have descriptive names (e.g., "greeting")
- End nodes are conventionally named "end"
Connect nodes by dragging from outputs to inputs
Edit node properties in the side panel
Export your flow configuration using the toolbar

Examples

The editor/examples/ directory contains sample flow configurations:

food_ordering.json
movie_explorer.py
patient_intake.json
restaurant_reservation.json
travel_planner.json

To use an example:

Open the editor
Click "Import Flow"
Select an example JSON file

See the examples directory for the complete files and documentation.

Development

Available Scripts

npm start - Start production server
npm run dev - Start development server
npm run build - Build for production
npm run preview - Preview production build locally
npm run preview:prod - Preview production build with base path
npm run lint - Check for linting issues
npm run lint:fix - Fix linting issues
npm run format - Format code with Prettier
npm run format:check - Check code formatting
npm run docs - Generate documentation
npm run docs:serve - Serve documentation locally

Documentation

The Pipecat Flows Editor project uses JSDoc for documentation. To generate and view the documentation:

Generate documentation:

npm run docs

Serve documentation locally:

npm run docs:serve

View in browser by opening: http://localhost:8080

Contributing

We welcome contributions from the community! Whether you're fixing bugs, improving documentation, or adding new features, here's how you can help:

Found a bug? Open an issue
Have a feature idea? Start a discussion
Want to contribute code? Check our CONTRIBUTING.md guide
Documentation improvements? Docs PRs are always welcome

Before submitting a pull request, please check existing issues and PRs to avoid duplicates.

We aim to review all contributions promptly and provide constructive feedback to help get your changes merged.

Getting help

➡️ Join our Discord

➡️ Pipecat Flows Guide

➡️ Reach us on X

For Tasks:

Click tags to check more tools for each tasks

design conversation flows manage state create personalized experiences handle customer service scripts build complex decision trees

For Jobs:

ai developer conversation designer customer support specialist data scientist software engineer

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