agent-pr-creator

Agent PR Creator

Analyze git diffs and commit history to intelligently fill PR templates and create pull requests via gh CLI. This skill walks through detecting the base branch, analyzing changes, reading the project's PR template, filling it with context from commits and diffs, and creating the PR.

Workflow

Phase 1: Detect Base Branch and Check for Existing PR

Determine what base branch this PR will target:

# Check if develop exists; fall back to main
git rev-parse --verify develop 2>/dev/null && echo "develop" || echo "main"

# Current branch
git branch --show-current

Check if a PR already exists for the current branch:

gh pr list --head $(git branch --show-current) --json number,url,title

If a PR exists, stop and inform the user. Ask if they want to update the description with gh pr edit instead.

Gate: If there are uncommitted changes or the branch is behind remote, warn the user and stop:

# Check for uncommitted changes
git status --porcelain

# Check if branch is behind remote
git rev-parse @{u} 2>/dev/null && git log --oneline @..@{u}

If the branch has no remote tracking, push with -u before creating the PR:

git push -u origin $(git branch --show-current)

Phase 2: Analyze Changes

Gather the full context of changes since the base branch:

# Get the base branch
BASE=$(git rev-parse --verify develop 2>/dev/null && echo "develop" || echo "main")

# Changed files
git diff ${BASE}...HEAD --name-only

# Commit log with oneline format
git log --oneline ${BASE}..HEAD

# Diff stats (file-level changes)
git diff ${BASE}...HEAD --stat

# Full diff for review (optional, context-dependent)
git diff ${BASE}...HEAD

Analyze the changes to understand:

• What files were modified and in what areas (frontend, backend, tests, docs, config)
• How many commits were made
• What conventional commit types are present (feat, fix, refactor, test, docs, chore)
• Any breaking changes (API changes, schema migrations, config format changes)
• Whether this is a refactor, new feature, bug fix, or combination

Phase 3: Read the PR Template

Locate and read the project's PR template:

# Standard locations
ls -la .github/PULL_REQUEST_TEMPLATE.md .github/pull_request_template.md PULL_REQUEST_TEMPLATE.md pull_request_template.md 2>/dev/null | head -1

If found, read the entire template to understand:

• All required sections (Description, Type of Change, Breaking Changes, Screenshots, Notes, Checklist)
• Exact checkbox labels and options
• Any specific instructions or conventions the project uses

If no template is found, create a minimal PR with just title and description.

Phase 4: Fill the PR Template

Fill each section of the template based on the changes:

Title: Use conventional commit format

• Prefix: feat:, fix:, refactor:, docs:, test:, chore: based on the majority of commits
• Format: <type>: <short description>
• Keep under 70 characters
• Use imperative mood ("add", "fix", "update", not "added", "fixed", "updates")
• Example: feat: add authentication service integration

Description:

• Analyze the diff and commits to write 2-3 sentence summary of what changed and why
• Focus on business value, not implementation details
• Group logically if multiple areas were modified (e.g., "Database layer changes to improve query performance. Frontend changes to display new metrics. New monitoring queries added to dashboard.")
• Reference Linear/issue IDs if present in branch name or commits (e.g., PUL3-34, #123)
• Example: "Adds OAuth 2.0 authentication flow for third-party integrations. Uses standard OIDC provider patterns to support multiple identity services. Closes PUL3-42."

Type of Change:

• Analyze commit prefixes: feat → New Feature, fix → Bug Fix, refactor → Code Refactoring, test → Tests, docs → Documentation, chore/build → Build/Config
• Check boxes that match: [x] for selected, [ ] for unselected
• Use exact checkbox labels from the template — do not rewrite or paraphrase
• Multiple boxes can be checked (e.g., a feature PR might also include tests)

Breaking Changes:

• Analyze if any of these were modified:
  • Public API contracts (function signatures, endpoints, exported types)
  • Database schemas (new required fields, removed columns, type changes)
  • Environment variables (new required vars, removed vars, changed format)
  • Config file formats (structure, required keys, deprecated options)
  • Removed exports or public methods
• If yes: check "Yes" and explain what breaks and required migration steps
• If no: check "No"
• Example: "Yes — POST /api/auth/login now requires oauth_provider field. Existing calls without this field will return 400. Migrate by updating client-side auth code to specify the provider."

Screenshots / Videos:

• If changes touch UI files (src/components/, pages/, app/, or file extensions like .jsx, .tsx, .vue): add placeholder <!-- Please attach screenshots/videos of UI changes -->
• Otherwise: write N/A — No UI changes

Additional Notes / Checklist:

• Mention deployment steps if non-standard (database migrations, environment setup, service restarts)
• Mention dependencies on other PRs or services
• Add reviewer instructions if changes require specific testing paths or edge cases
• If nothing special: N/A or leave empty per template style

Phase 5: Create the PR

Use gh pr create with the filled template and title:

gh pr create \
  --base ${BASE} \
  --title "<type>: <short description>" \
  --body "<filled template body as HEREDOC or string>"

Example:

gh pr create --base develop \
  --title "feat: add authentication service integration" \
  --body $'## Description\nAdds OAuth 2.0 support for third-party integrations.\n\n## Type of Change\n- [x] New Feature\n- [ ] Bug Fix\n\n## Breaking Changes\n- [ ] Yes\n- [x] No\n\n## Screenshots\nN/A'

Important: Preserve markdown formatting from the template. Use shell HEREDOC ($'...') or multi-line strings to maintain section separators and formatting.

Phase 6: Confirm and Report

After gh pr create succeeds, output:

1. The PR URL (e.g., https://github.com/owner/repo/pull/456)
2. PR number
3. A brief summary of what was included (types of changes, key areas affected)
4. Mention if any reviewers were auto-assigned or any special status (draft, ready for review)

Example output:

PR created: https://github.com/ravn/ai-toolkit/pull/123
Type: feat (New Feature)
Changes: 3 files, 156 additions
Affected areas: Authentication service, OAuth integration tests
Ready for review.

Examples

Positive Trigger

User: "fill the PR template and create a pull request for my branch"

Expected behavior: Use agent-pr-creator workflow to analyze git history, read the PR template, fill all sections intelligently based on the changes, and create the PR via gh pr create.

---

User: "I need to open a pull request with a good description"

Expected behavior: Use agent-pr-creator to gather context from commits and diffs, analyze the change type (feat/fix/refactor), detect breaking changes, and create a comprehensive PR with proper title and body following conventions.

---

User: "Make a PR to main"

Expected behavior: Use agent-pr-creator to detect the base branch, analyze all changes since branching, fill the template following project conventions, and create the PR.

Non-Trigger

User: "Review this pull request: https://github.com/org/repo/pull/123"

Expected behavior: Do not use agent-pr-creator. The user wants to review an existing PR, not create one. Use gh pr view or a review skill instead.

---

User: "What changes are in my branch?"

Expected behavior: Do not use agent-pr-creator. The user wants to see changes, not create a PR. Use git diff or git log directly.

Troubleshooting

Skill Does Not Trigger

• Error: The skill is not selected when the user asks to create a PR.
• Cause: Request wording does not match trigger phrases. Request used generic words like "review" or "commit" instead of "create PR", "open PR", or "make PR".
• Solution: Rephrase with explicit PR creation keywords like "create a pull request", "make a PR", or "open a PR" and retry.

PR Template Not Found

• Error: Cannot find .github/PULL_REQUEST_TEMPLATE.md or similar.
• Cause: Project does not have a PR template, or it's in a non-standard location.
• Solution: Search for template files in .github/ and common root locations. If none exist, create a minimal PR with just title and description using the conventional commit format.

PR Already Exists for This Branch

• Error: gh pr create fails because a PR already exists for this branch.
• Cause: The branch already has an open PR.
• Solution: Inform the user of the existing PR URL and ask if they want to update the description using gh pr edit <PR> instead of creating a new one.

Uncommitted Changes or Branch Behind Remote

• Error: Cannot create PR due to uncommitted changes or branch being behind remote.
• Cause: Working directory has unstaged/uncommitted changes or local branch is behind upstream.
• Solution: For uncommitted changes: warn the user and suggest committing with /commit or stashing first. For branch behind: pull and rebase before creating the PR.

Missing Remote Tracking Branch

• Error: gh pr create fails because branch has no upstream tracking.
• Cause: Local branch has never been pushed to the remote.
• Solution: Push the branch first with git push -u origin <branch-name>, then create the PR.

gh CLI Authentication Failed

• Error: gh commands fail with "not authenticated" or "token expired" error.
• Cause: GitHub CLI is not logged in or the auth token has expired.
• Solution: Run gh auth login to re-authenticate, then retry the skill.