generate-pr

name	generate-pr
description	Generate a pull request description by analyzing git changes against the target branch and filling in the project's PR template. Use this skill when the user asks to "generate PR description", "write PR description", "create PR body", "fill PR template", "prepare pull request", or similar requests related to pull request documentation.

PR Description Generator

Overview

Analyze git changes (committed or staged) against a target branch and generate a complete pull request description using the project's PR template. The skill examines diffs, affected modules, commit history, and code context to produce a ready-to-paste PR body.

When to Use

Use this skill when the user requests:

• "Generate a PR description"
• "Write a PR description"
• "Create a PR body"
• "Fill the PR template"
• "Prepare a pull request"
• Any similar request asking for help with pull request documentation

Workflow

1. Determine the Target Branch and Gather Git Info

Ask the user for the target branch if not provided. Default to main.

Run the following git commands in parallel:

git branch --show-current
git log --oneline <target>..HEAD
git diff --stat <target>..HEAD
git diff <target>..HEAD

Also check for a project PR template (run in parallel):

# Check for PR template (GitHub supports multiple locations)
ls .github/PULL_REQUEST_TEMPLATE.md .github/pull_request_template.md .github/PULL_REQUEST_TEMPLATE/ docs/pull_request_template.md pull_request_template.md 2>/dev/null

Replace <target> with the actual target branch.

Key information to extract:

• Current branch name (often contains a ticket ID like feature/PROJ-1234-description)
• List of commits being merged
• Files changed with summary stats
• The actual code diffs
• PR template — if a project template exists, read it and use it instead of the default template in Step 5. Fill in all template sections. If no project template exists, use the built-in default.

2. Analyze the Changes

Examine the diff output to understand:

• What was changed (which files, modules, components, services)
• Why it was changed (new feature, bug fix, refactor, tech debt, migration)
• Scope — which layers or modules are affected
• UI changes — whether any views or components were added or modified
• Test coverage — whether tests were added/updated alongside the changes
• Breaking changes — any public API changes, removed/renamed exports, schema migrations, changed configuration formats, or removed features. If found, these must be called out prominently in the PR description with a ⚠️ BREAKING label.
• Dependency changes — any modifications to package manifests (package.json, Podfile, requirements.txt, pyproject.toml, Cargo.toml, go.mod, Package.swift, build.gradle, Gemfile, etc.). If found, list what was added/removed/updated in the PR description.
• Migration requirements — any database migrations, schema changes, environment variable additions, or infrastructure changes that require action before/after deployment. If found, add a "Deployment Notes" section to the PR.

Size check: Count total lines changed from git diff --stat. If the PR exceeds 500 lines changed (excluding generated files, lock files, and snapshots), warn the user:

This PR is large ([N] lines changed across [N] files).
Large PRs are harder to review and more likely to introduce regressions.

Would you like me to:
1. Generate the description as-is
2. Suggest how to split into smaller PRs

Categorize the PR type:

• Feature — new user-facing functionality
• Bug Fix — corrects incorrect behavior
• Refactor — restructures code without changing behavior
• Tech Debt — cleanup, migration, dependency updates
• Documentation — docs-only changes

3. Extract Ticket Link

Look for a ticket identifier in:

1. The branch name (e.g., feature/PROJ-1234-something)
2. Commit messages (e.g., PROJ-1234: Add feature)

If a project tracking URL pattern is documented in AGENTS.md or CLAUDE.md, use it to construct the full URL. Otherwise, include just the ticket ID.

If no ticket is found, leave a placeholder: <!-- Add ticket link here -->

4. Assess Risk & Suggest Reviewers

Risk assessment — rate the PR based on:

Factor	Low	Medium	High
Files changed	1-5	6-15	16+
Modules touched	1	2-3	4+
Breaking changes	None	Backward-compatible	Removes/renames
Test coverage	Tests added	Existing tests pass	No tests for changed code
Reversibility	Easy rollback	Needs migration rollback	Irreversible (data changes)

If any factor is High, the overall PR risk is High. Include the risk level in the Review Focus section.

Reviewer suggestion — run git log --format='%an' <target>..HEAD -- <changed-files> | sort | uniq -c | sort -rn | head -5 to identify who has recently worked on the changed files. If the PR author is the only contributor, fall back to git log --format='%an' -- <changed-files> for historical authors. Suggest 1-2 reviewers in the output.

If git log returns no useful results (new files only), skip reviewer suggestion.

5. Generate Validation Steps

Based on the changes, generate concrete steps for local validation:

• If UI changes: include steps to navigate to the affected screen and verify the visual change
• If behavior changes: include steps to trigger the behavior and verify the outcome
• If refactor/migration: include steps to verify existing behavior is unchanged

6. Fill the PR Template

If a project PR template was found in Step 1, use it. Otherwise, use this default:

## Summary
<!-- What does this PR do? One or two sentences max. -->

## Motivation / Context
<!-- WHY are these changes being made? Link to ticket/issue if applicable. -->
Closes #

## Type of Change
- [ ] New feature
- [ ] Bug fix
- [ ] Refactoring (no functional changes)
- [ ] Performance improvement
- [ ] Documentation / CI/CD

## Changes Made
<!-- Bullet points of key changes. Not every file — just the meaningful decisions. -->
-
-

<!-- Include if breaking changes were detected in Step 2 -->
## ⚠️ Breaking Changes
<!-- What broke, what consumers need to do to migrate -->
-

<!-- Include if dependency changes were detected in Step 2 -->
## Dependency Changes
<!-- What was added/removed/updated -->
-

<!-- Include if migration/deployment requirements were detected in Step 2 -->
## Deployment Notes
<!-- Steps required before/after deployment: migrations, env vars, config changes -->
-

## How to Test
<!-- Step-by-step so a reviewer can verify it works. -->
1.
2.

## Review Focus
<!-- Tell reviewers WHERE you want their attention most. Include risk level from Step 4. -->
**Risk:** [Low / Medium / High]
**Suggested reviewers:** [names from git blame analysis]
-

## Screenshots / Demo
<!-- For UI changes: before/after screenshots or screen recordings. -->

## Checklist
- [ ] Self-reviewed my own code
- [ ] No new warnings/errors introduced
- [ ] Tests added or updated
- [ ] Existing tests pass locally
- [ ] Docs updated if needed

Omit the Breaking Changes, Dependency Changes, and Deployment Notes sections if not applicable — don't include them empty.

7. Present the Output

Output the generated PR description in a fenced markdown block.

Then ask if the user would like to:

• Use this description as-is
• Modify specific sections
• Regenerate with different emphasis
• Create the PR now (using gh pr create)

If UI changes were detected, remind the user to add before/after screenshots.

Do not automatically create a PR — just provide the description and let the user decide what to do with it.

Guidelines

• Be specific, not generic — "Add battery optimization toggle to Energy Settings" not "Update feature"
• Match project vocabulary — use terms from AGENTS.md or CLAUDE.md context files
• Reference modules by name — "Updates User client and Profile feature component"
• Checklist accuracy — mark the test checkbox as checked only if the diff actually contains test changes
• Keep descriptions scannable — use bullet points, keep paragraphs short
• Validation steps should be actionable — "Open the app > Navigate to Settings > Tap Profile" not "Test the feature"

Examples

Example 1: Feature PR

Branch: feature/PROJ-5678-user-history Changes: New history screen, new API endpoint

## Summary
Add user activity history screen showing past events with timestamps and details.

## Motivation / Context
Users need visibility into their past activity for auditing and personal tracking.
Closes #5678

## Type of Change
- [x] New feature
- [ ] Bug fix
- [ ] Refactoring (no functional changes)
- [ ] Performance improvement
- [ ] Documentation / CI/CD

## Changes Made
- Add `HistoryListView` displaying events in a chronological list
- Add `/api/history` endpoint to `User`
- Add `HistoryEvent` model with JSON decoding
- Cursor-based pagination matching the API contract (limited to 90 days)

## How to Test
1. Build and run the app on simulator
2. Navigate to Profile → Activity History
3. Verify event list loads with timestamps
4. Scroll to bottom to verify pagination loads more events

## Review Focus
- Pagination logic in `HistoryListView` — edge case handling for empty history
- JSON decoding of `HistoryEvent` — nullable fields

## Screenshots / Demo
<!-- Add screenshots of the history screen -->

## Checklist
- [x] Self-reviewed my own code
- [x] No new warnings/errors introduced
- [x] Tests added or updated
- [x] Existing tests pass locally
- [ ] Docs updated if needed

Example 2: Bug Fix PR

Branch: bugfix/PROJ-9012-crash-on-load Changes: Fix nil handling in data loader

## Summary
Fix crash when loading profile for users without premium subscription.

## Motivation / Context
Users without premium subscriptions hit a nil dereference on the profile screen.
Closes #9012

## Type of Change
- [ ] New feature
- [x] Bug fix
- [ ] Refactoring (no functional changes)
- [ ] Performance improvement
- [ ] Documentation / CI/CD

## Changes Made
- Add nil check for `profile.details` in `ProfileLoader`
- Update `UserProfile` model to make `premiumdetails` optional
- Add test case for users without premium subscription

## How to Test
1. Build and run the app on simulator
2. Log in as a user without premium subscription
3. Navigate to Profile
4. Verify the screen loads without crashing
5. Verify premium features are appropriately hidden

## Review Focus
- Optionality change on `UserProfile.premiumDetails` — ensure callers handle nil

## Screenshots / Demo
<!-- N/A — no UI changes -->

## Checklist
- [x] Self-reviewed my own code
- [x] No new warnings/errors introduced
- [x] Tests added or updated
- [x] Existing tests pass locally
- [ ] Docs updated if needed