promptflow - Build high-quality LLM apps - from prototyping, testing to production deployment and monitoring.

Created at: 2023-06-30 14:03:06
Language: Python
License: MIT

Prompt flow

Python package Python PyPI - Downloads CLI vsc extension

Doc Issue Discussions CONTRIBUTING License: MIT

Welcome to join us to make Prompt flow better by participating discussions, opening issues, submitting PRs.

Prompt flow is a suite of development tools designed to streamline the end-to-end development cycle of LLM-based AI applications, from ideation, prototyping, testing, evaluation to production deployment and monitoring. It makes prompt engineering much easier and enables you to build LLM apps with production quality.

With prompt flow, you will be able to:

  • Create and iteratively develop flow
    • Create executable flows that link LLMs, prompts, Python code and other tools together.
    • Debug and iterate your flows, especially the interaction with LLMs with ease.
  • Evaluate flow quality and performance
    • Evaluate your flow's quality and performance with larger datasets.
    • Integrate the testing and evaluation into your CI/CD system to ensure quality of your flow.
  • Streamlined development cycle for production
    • Deploy your flow to the serving platform you choose or integrate into your app's code base easily.
    • (Optional but highly recommended) Collaborate with your team by leveraging the cloud version of Prompt flow in Azure AI.


Ensure you have a python environment, python=3.9 is recommended.

pip install promptflow promptflow-tools

Quick Start ⚡

Create a chatbot with prompt flow

Run the command to initiate a prompt flow from a chat template, it creates folder named my_chatbot and generates required files within it:

pf flow init --flow ./my_chatbot --type chat

Setup a connection for your API key

For OpenAI key, establish a connection by running the command, using the openai.yaml file in the my_chatbot folder, which stores your OpenAI key (override keys and name with --set to avoid yaml file changes):

pf connection create --file ./my_chatbot/openai.yaml --set api_key=<your_api_key> --name open_ai_connection

For Azure OpenAI key, establish the connection by running the command, using the azure_openai.yaml file:

pf connection create --file ./my_chatbot/azure_openai.yaml --set api_key=<your_api_key> api_base=<your_api_base> --name open_ai_connection

Chat with your flow

In the my_chatbot folder, there's a flow.dag.yaml file that outlines the flow, including inputs/outputs, nodes, connection, and the LLM model, etc

Note that in the chat node, we're using a connection named open_ai_connection (specified in connection field) and the gpt-35-turbo model (specified in deployment_name field). The deployment_name filed is to specify the OpenAI model, or the Azure OpenAI deployment resource.

Interact with your chatbot by running: (press Ctrl + C to end the session)

pf flow test --flow ./my_chatbot --interactive

Next Step! Continue with the Tutorial 👇 section to delve deeper into Prompt flow.

Tutorial 🏃‍♂️

Prompt Flow is a tool designed to build high quality LLM apps, the development process in prompt flow follows these steps: develop a flow, improve the flow quality, deploy the flow to production.

Develop your own LLM apps

VS Code Extensionlogo

We also offer a VS Code extension (a flow designer) for an interactive flow development experience with UI.


You can install it from the visualstudio marketplace.

Deep dive into flow development

Getting Started with Prompt Flow: A step by step guidance to invoke your first flow run.

Learn from use cases

Tutorial: Chat with PDF: An end-to-end tutorial on how to build a high quality chat application with prompt flow, including flow development and evaluation with metrics.

More examples can be found here. We welcome contributions of new use cases!

Setup for contributors

If you're interested in contributing, please start with our dev setup guide:

Next Step! Continue with the Contributing 👇 section to to contribute to Prompt flow.


This project welcomes contributions and suggestions. Most contributions require you to agree to a Contributor License Agreement (CLA) declaring that you have the right to, and actually do, grant us the rights to use your contribution. For details, visit

When you submit a pull request, a CLA bot will automatically determine whether you need to provide a CLA and decorate the PR appropriately (e.g., status check, comment). Simply follow the instructions provided by the bot. You will only need to do this once across all repos using our CLA.

This project has adopted the Microsoft Open Source Code of Conduct. For more information see the Code of Conduct FAQ or contact with any additional questions or comments.


This project may contain trademarks or logos for projects, products, or services. Authorized use of Microsoft trademarks or logos is subject to and must follow Microsoft's Trademark & Brand Guidelines. Use of Microsoft trademarks or logos in modified versions of this project must not cause confusion or imply Microsoft sponsorship. Any use of third-party trademarks or logos are subject to those third-party's policies.

Code of Conduct

This project has adopted the Microsoft Open Source Code of Conduct. For more information see the Code of Conduct FAQ or contact with any additional questions or comments.


Copyright (c) Microsoft Corporation. All rights reserved.

Licensed under the MIT license.