Pr Writer

---
name: pr-writer
description: ALWAYS use this skill when creating or updating pull requests — never create or edit a PR directly without it. Follows Sentry conventions for PR titles, descriptions, and issue references. Trigger on any create PR, open PR, submit PR, make PR, update PR title, update PR description, edit PR, push and create PR, prepare changes for review task, or request for a PR writer.
---

# PR Writer

Create pull requests following Sentry's engineering practices.

**Requires**: GitHub CLI (`gh`) authenticated and available.

## Prerequisites

Before creating a PR, ensure all changes are committed. If there are uncommitted changes, run the `sentry-skills:commit` skill first to commit them properly.

```bash
# Check for uncommitted changes
git status --porcelain
```

If the output shows any uncommitted changes (modified, added, or untracked files that should be included), invoke the `sentry-skills:commit` skill before proceeding.

## Process

### Step 1: Verify Branch State

```bash
# Detect the default branch — note the output for use in subsequent commands
gh repo view --json defaultBranchRef --jq '.defaultBranchRef.name'
```

```bash
# Check current branch and status (substitute the detected branch name above for BASE)
git status
git log BASE..HEAD --oneline
```

Ensure:
- All changes are committed
- Branch is up to date with remote
- Changes are rebased on the base branch if needed

### Step 2: Analyze Changes

Review what will be included in the PR:

```bash
# See all commits that will be in the PR (substitute detected branch name for BASE)
git log BASE..HEAD

# See the full diff
git diff BASE...HEAD
```

Understand the scope and purpose of all changes before writing the description.

### Step 3: Write the PR Description

Use this structure for PR descriptions (ignoring any repository PR templates):

```markdown
<brief description of what the PR does>

<why these changes are being made - the motivation>

<alternative approaches considered, if any>

<any additional context reviewers need>
```

**Do NOT include:**
- "Test plan" sections
- Checkbox lists of testing steps
- Redundant summaries of the diff
- Customer data — customer/org names, user emails, support ticket contents, or PII. Describe the technical symptom, not who hit it, and if available, reference the internal ticket (e.g. `Fixes SENTRY-1234`). PRs are typically public on open-source repos.

**Do include:**
- Clear explanation of what and why
- Links to relevant issues or tickets
- Context that isn't obvious from the code
- Notes on specific areas that need careful review

### Step 4: Create the PR

```bash
gh pr create --draft --title "<type>(<scope>): <description>" --body "$(cat <<'EOF'
<description body here>
EOF
)"
```

**Title format** follows commit conventions:
- `feat(scope): Add new feature`
- `fix(scope): Fix the bug`
- `ref: Refactor something`

## PR Description Examples

### Feature PR

```markdown
Add Slack thread replies for alert notifications

When an alert is updated or resolved, we now post a reply to the original
Slack thread instead of creating a new message. This keeps related
notifications grouped and reduces channel noise.

Previously considered posting edits to the original message, but threading
better preserves the timeline of events and works when the original message
is older than Slack's edit window.

Refs SENTRY-1234
```

### Bug Fix PR

```markdown
Handle null response in user API endpoint

The user endpoint could return null for soft-deleted accounts, causing
dashboard crashes when accessing user properties. This adds a null check
and returns a proper 404 response.

Found while investigating SENTRY-5678.

Fixes SENTRY-5678
```

### Refactor PR

```markdown
Extract validation logic to shared module

Moves duplicate validation code from the alerts, issues, and projects
endpoints into a shared validator class. No behavior change.

This prepares for adding new validation rules in SENTRY-9999 without
duplicating logic across endpoints.
```

## Issue References

Reference issues in the PR body:

| Syntax | Effect |
|--------|--------|
| `Fixes #1234` | Closes GitHub issue on merge |
| `Fixes SENTRY-1234` | Closes Sentry issue |
| `Refs GH-1234` | Links without closing |
| `Refs LINEAR-ABC-123` | Links Linear issue |

## Guidelines

- **One PR per feature/fix** - Don't bundle unrelated changes
- **Keep PRs reviewable** - Smaller PRs get faster, better reviews
- **Explain the why** - Code shows what; description explains why
- **Mark WIP early** - Use draft PRs for early feedback

## Editing Existing PRs

If you need to update a PR after creation, use `gh api` instead of `gh pr edit`:

```bash
# Update PR description
gh api -X PATCH repos/{owner}/{repo}/pulls/PR_NUMBER -f body="$(cat <<'EOF'
Updated description here
EOF
)"

# Update PR title
gh api -X PATCH repos/{owner}/{repo}/pulls/PR_NUMBER -f title='new: Title here'

# Update both
gh api -X PATCH repos/{owner}/{repo}/pulls/PR_NUMBER \
  -f title='new: Title' \
  -f body='New description'
```

Note: `gh pr edit` is currently broken due to GitHub's Projects (classic) deprecation.

## References

- [Sentry Code Review Guidelines](https://develop.sentry.dev/engineering-practices/code-review/)
- [Sentry Commit Messages](https://develop.sentry.dev/engineering-practices/commit-messages/)