# GitHub integration {#github}

Git repositories are the centerpiece of the vast majority of software projects
out there. We integrate with GitHub to provide Tuist insights right in your pull
requests and to save you some configuration such as syncing your default branch.

## Setup {#setup}

You will need to install the Tuist GitHub app in the `Integrations` tab of your
organization: ![An image that shows the integrations
tab](/images/guides/integrations/gitforge/github/integrations.png)

After that, you can add a project connection between your GitHub repository and
your Tuist project:

![An image that shows adding the project
connection](/images/guides/integrations/gitforge/github/add-project-connection.png)

## Pull/merge request comments {#pull-merge-request-comments}

The GitHub app posts a Tuist run report, which includes a summary of the PR,
including links to the latest
<LocalizedLink href="/guides/features/previews#pullmerge-request-comments">previews</LocalizedLink>
or
<LocalizedLink href="/guides/features/selective-testing#pullmerge-request-comments">tests</LocalizedLink>:

![An image that shows the pull request
comment](/images/guides/integrations/gitforge/github/pull-request-comment.png)

::: info REQUIREMENTS
<!-- -->
The comment is only posted when your CI runs are
<LocalizedLink href="/guides/integrations/continuous-integration#authentication">authenticated</LocalizedLink>.
<!-- -->
:::

::: info GITHUB_REF
<!-- -->
If you have a custom workflow that's not triggered on a PR commit, but for
example, a GitHub comment, you might need to ensure that the `GITHUB_REF`
variable is set to either `refs/pull/<PR_NUMBER>/merge` or
`refs/pull/<PR_NUMBER>/head`.

You can run the relevant command, like `tuist share`, with the prefixed
`GITHUB_REF` environment variable: <code v-pre>GITHUB_REF="refs/pull/${{
github.event.issue.number }}/head" tuist share</code>
<!-- -->
:::