> ## Documentation Index
> Fetch the complete documentation index at: https://allhandsai-add-helm-laminar-analytics-docs.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# GitHub PR Review Assistant

> Automatically review pull requests using an OpenHands agent.

Use the GitHub PR Review Assistant when you want Agent Canvas to watch pull requests and have an OpenHands agent review them.

The setup has two parts:

* Give the active backend access to GitHub
* Start the pre-built PR review workflow from `Automate`

## Prerequisites

Before you start, make sure you have:

* Agent Canvas installed and running
* An LLM configured for the backend that will run the automation
* Access to create a GitHub token for the repository you want to review
* Access to install MCP servers and save secrets in Agent Canvas

If you are new to Agent Canvas, start with [Install](/openhands/usage/agent-canvas/setup) and [First-Time Setup](/openhands/usage/agent-canvas/first-time-setup).

## Create a GitHub Access Token

1. Go to [GitHub Developer Settings](https://github.com/settings/tokens).
2. Click `Generate new token`.
3. Prefer a fine-grained personal access token if your organization supports it.
4. Give the token a clear name, such as `Agent Canvas PR Reviewer`.
5. Select repository access:
   * Choose `Only select repositories` for the safest setup.
   * Choose `All repositories` only if the automation needs broad access.
6. Set an expiration date that matches your team's security policy.

## Add Repository Permissions

In the token setup screen, grant the permissions the reviewer needs.

For a PR review automation, use:

| Permission      | Access                                                 |
| --------------- | ------------------------------------------------------ |
| `Contents`      | Read and write                                         |
| `Issues`        | Read and write                                         |
| `Pull requests` | Read and write                                         |
| `Metadata`      | Read-only                                              |
| `Actions`       | Read-only, if the automation should inspect CI results |
| `Checks`        | Read-only, if the automation should inspect check runs |

Then click `Generate token` and copy the token immediately.

<Note>
  GitHub only shows the token once. Store it somewhere secure until you finish configuring Agent Canvas.
</Note>

## Add the GitHub MCP Server

The GitHub MCP server gives the agent tools for reading repositories, inspecting pull requests, and posting review output.

1. In Agent Canvas, check the backend switcher in the bottom-left corner.
2. Make sure the active backend is the backend where you want the PR review automation to run.
3. Open `Customize`.
4. Open `MCP Servers`.
5. Select `GitHub` from the MCP library.
6. Paste the GitHub token you created earlier.
7. Make sure the secret-creation toggle is on so Agent Canvas creates the token secret automatically when you save the MCP server configuration.
8. Save the MCP server configuration.

## Start the PR Review Workflow

1. Open `Automate` in the left navigation.
2. Find `Start from a proven workflow`.
3. Choose the GitHub PR review workflow.
4. Agent Canvas opens a new conversation with a prefilled setup prompt.
5. Send the prompt as-is, or edit it first if you already know what you want.

After you send the prompt, the agent starts a setup conversation. It uses the preconfigured skills and GitHub access to interview you, clarify the review workflow, and create the automation.

## Customize the Review

You do not need to know every detail before sending the prefilled prompt. The agent will ask follow-up questions to clarify:

* The repository owner and name
* Which pull requests to review
* Whether the agent should post a single summary comment or detailed inline feedback
* Whether the agent should inspect CI results before commenting
* Any files, directories, or checks the reviewer should ignore

You can edit the prefilled prompt before sending it if you want to provide any of those details up front.

## Verify the Automation

After the automation is created:

1. Open `Automate`.
2. Confirm the new automation appears in the list.
3. Open the automation details and check that it is enabled.
4. Trigger or wait for a matching pull request event.
5. Confirm that the agent run appears and that the review is posted to GitHub.

## Related Guides

* [GitHub Repository Monitor](/openhands/usage/agent-canvas/prebuilt/github-repo-monitor)
* [Setup a Pre-built Automation](/openhands/usage/agent-canvas/prebuilt-automations)
* [Customize and Settings](/openhands/usage/agent-canvas/customize-and-settings)