pr-agent/README.md

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Making pull requests less painful with an AI agent
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CodiumAI `PR-Agent` is an open-source tool aiming to help developers review pull requests faster and more efficiently. It automatically analyzes the pull request and can provide several types of PR feedback:

**Auto Description (/describe)**: Automatically generating [PR description](https://github.com/Codium-ai/pr-agent/pull/229#issue-1860711415) - title, type, summary, code walkthrough and labels.
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**Auto Review (/review)**: [Adjustable feedback](https://github.com/Codium-ai/pr-agent/pull/229#issuecomment-1695022908) about the PR main theme, type, relevant tests, security issues, score, and various suggestions for the PR content.
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**Question Answering (/ask ...)**: Answering [free-text questions](https://github.com/Codium-ai/pr-agent/pull/229#issuecomment-1695021332) about the PR.
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**Code Suggestions (/improve)**: [Committable code suggestions](https://github.com/Codium-ai/pr-agent/pull/229#discussion_r1306919276) for improving the PR.
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**Update Changelog (/update_changelog)**: Automatically updating the CHANGELOG.md file with the [PR changes](https://github.com/Codium-ai/pr-agent/pull/168#discussion_r1282077645).


See the [usage guide](./Usage.md) for instructions how to run the different tools from [CLI](./Usage.md#working-from-a-local-repo-cli), or by [online usage](./Usage.md#online-usage).

<h3>Example results:</h3>
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<h4><a href="https://github.com/Codium-ai/pr-agent/pull/229#issuecomment-1687561986">/describe:</a></h4>
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<img src="https://www.codium.ai/images/describe-2.gif" width="800">
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<h4><a href="https://github.com/Codium-ai/pr-agent/pull/229#issuecomment-1695021901">/review:</a></h4>
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<img src="https://www.codium.ai/images/review-2.gif" width="800">
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[//]: # (<h4><a href="https://github.com/Codium-ai/pr-agent/pull/78#issuecomment-1639739496">/reflect_and_review:</a></h4>)

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[//]: # (<img src="https://www.codium.ai/images/reflect_and_review.gif" width="800">)

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[//]: # (<h4><a href="https://github.com/Codium-ai/pr-agent/pull/229#issuecomment-1695020538">/ask:</a></h4>)

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[//]: # (<img src="https://www.codium.ai/images/ask-2.gif" width="800">)

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[//]: # (<h4><a href="https://github.com/Codium-ai/pr-agent/pull/229#issuecomment-1695024952">/improve:</a></h4>)

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## Table of Contents
- [Overview](#overview)
- [Try it now](#try-it-now)
- [Installation](#installation)
- [Usage guide](./Usage.md)
- [How it works](#how-it-works)
- [Why use PR-Agent](#why-use-pr-agent)
- [Roadmap](#roadmap)
</div>


## Overview
`PR-Agent` offers extensive pull request functionalities across various git providers:
|       |                                             | GitHub | Gitlab | Bitbucket | CodeCommit | Azure DevOps |
|-------|---------------------------------------------|:------:|:------:|:---------:|:----------:|:----------:|
| TOOLS | Review                                      |   :white_check_mark:    |   :white_check_mark:    |   :white_check_mark:       |   :white_check_mark:    |   :white_check_mark:    |
|       | Ask                                         |   :white_check_mark:    |   :white_check_mark:    |   :white_check_mark:          |   :white_check_mark:          | :white_check_mark:
|       | Auto-Description                            |   :white_check_mark:    |   :white_check_mark:    |           |   :white_check_mark:    |   :white_check_mark:    |
|       | Improve Code                                |   :white_check_mark:    |   :white_check_mark:    |           |          |          |
|       | ⮑ Extended                             |   :white_check_mark:    |   :white_check_mark:    |           |          |          |
|       | Reflect and Review                          |   :white_check_mark:    |                         |           |          |   :white_check_mark:    |
|       | Update CHANGELOG.md                         |   :white_check_mark:    |                         |           |          |          |
|       |                                             |        |        |      |      |      |
| USAGE | CLI                                         |   :white_check_mark:    |   :white_check_mark:    |   :white_check_mark:       |   :white_check_mark:    |   :white_check_mark:    |
|       | App / webhook                               |   :white_check_mark:    |   :white_check_mark:    |           |          |          |
|       | Tagging bot                                 |   :white_check_mark:    |        |           |          |          |
|       | Actions                                     |   :white_check_mark:    |        |           |          |          |
|       |                                             |        |        |      |      |      |
| CORE  | PR compression                              |   :white_check_mark:    |   :white_check_mark:    |   :white_check_mark:       | :white_check_mark: |   :white_check_mark:       |
|       | Repo language prioritization                |   :white_check_mark:    |   :white_check_mark:    |   :white_check_mark:       | :white_check_mark: |   :white_check_mark:       |
|       | Adaptive and token-aware<br />file patch fitting |   :white_check_mark:    |   :white_check_mark:    |   :white_check_mark:       | :white_check_mark: |   :white_check_mark:       |
|       | Multiple models support |   :white_check_mark:    |   :white_check_mark:    |   :white_check_mark:       | :white_check_mark: |   :white_check_mark:       |
|       | Incremental PR Review |   :white_check_mark:    |      |      |      |      |

Review the **[usage guide](./Usage.md)** section for detailed instructions how to use the different tools, select the relevant git provider (GitHub, Gitlab, Bitbucket,...), and adjust the configuration file to your needs.

## Try it now

You can try GPT-4 powered PR-Agent, on your public GitHub repository, instantly. Just mention `@CodiumAI-Agent` and add the desired command in any PR comment. The agent will generate a response based on your command.
For example, add a comment to any pull request with the following text:
```
@CodiumAI-Agent /review
```
and the agent will respond with a review of your PR

![Review generation process](https://www.codium.ai/images/demo-2.gif)


To set up your own PR-Agent, see the [Installation](#installation) section below.

---

## Installation

To get started with PR-Agent quickly, you first need to acquire two tokens:

1. An OpenAI key from [here](https://platform.openai.com/), with access to GPT-4.
2. A GitHub personal access token (classic) with the repo scope.

There are several ways to use PR-Agent:

- [Method 1: Use Docker image (no installation required)](INSTALL.md#method-1-use-docker-image-no-installation-required)
- [Method 2: Run from source](INSTALL.md#method-2-run-from-source)
- [Method 3: Run as a GitHub Action](INSTALL.md#method-3-run-as-a-github-action)
- [Method 4: Run as a polling server](INSTALL.md#method-4-run-as-a-polling-server)
  - Request reviews by tagging your GitHub user on a PR
- [Method 5: Run as a GitHub App](INSTALL.md#method-5-run-as-a-github-app)
  - Allowing you to automate the review process on your private or public repositories
- [Method 6: Deploy as a Lambda Function](INSTALL.md#method-6---deploy-as-a-lambda-function)
- [Method 7: AWS CodeCommit](INSTALL.md#method-7---aws-codecommit-setup)

## How it works

The following diagram illustrates PR-Agent tools and their flow:

![PR-Agent Tools](https://www.codium.ai/wp-content/uploads/2023/07/codiumai-diagram-v4.jpg)

Check out the [PR Compression strategy](./PR_COMPRESSION.md) page for more details on how we convert a code diff to a manageable LLM prompt

## Why use PR-Agent?

A reasonable question that can be asked is: `"Why use PR-Agent? What make it stand out from existing tools?"`

Here are some advantages of PR-Agent:

- We emphasize **real-life practical usage**. Each tool (review, improve, ask, ...) has a single GPT-4 call, no more. We feel that this is critical for realistic team usage - obtaining an answer quickly (~30 seconds) and affordably.
- Our [PR Compression strategy](./PR_COMPRESSION.md)  is a core ability that enables to effectively tackle both short and long PRs.
- Our JSON prompting strategy enables to have **modular, customizable tools**. For example, the '/review' tool categories can be controlled via the [configuration](pr_agent/settings/configuration.toml) file. Adding additional categories is easy and accessible.
- We support **multiple git providers** (GitHub, Gitlab, Bitbucket, CodeCommit), **multiple ways** to use the tool (CLI, GitHub Action, GitHub App, Docker, ...), and **multiple models** (GPT-4, GPT-3.5, Anthropic, Cohere, Llama2).
- We are open-source, and welcome contributions from the community.


## Roadmap

- [x] Support additional models, as a replacement for OpenAI (see [here](https://github.com/Codium-ai/pr-agent/pull/172))
- [x] Develop additional logic for handling large PRs (see [here](https://github.com/Codium-ai/pr-agent/pull/229))
- [ ] Add additional context to the prompt. For example, repo (or relevant files) summarization, with tools such a [ctags](https://github.com/universal-ctags/ctags)
- [ ] PR-Agent for issues, and just for pull requests
- [ ] Adding more tools. Possible directions:
  - [x] PR description
  - [x] Inline code suggestions
  - [x] Reflect and review
  - [x] Rank the PR (see [here](https://github.com/Codium-ai/pr-agent/pull/89))   
  - [ ] Enforcing CONTRIBUTING.md guidelines
  - [ ] Performance (are there any performance issues)
  - [ ] Documentation (is the PR properly documented)
  - [ ] ...

## Similar Projects

- [CodiumAI - Meaningful tests for busy devs](https://github.com/Codium-ai/codiumai-vscode-release) (although various capabilities are much more advanced in the CodiumAI IDE plugins)
- [Aider - GPT powered coding in your terminal](https://github.com/paul-gauthier/aider)
- [openai-pr-reviewer](https://github.com/coderabbitai/openai-pr-reviewer)
- [CodeReview BOT](https://github.com/anc95/ChatGPT-CodeReview)
- [AI-Maintainer](https://github.com/merwanehamadi/AI-Maintainer)