# PR Auto-Labeling Implementation Summary

## Date: October 27, 2025

## Objective
Implement automatic PR labeling based on Conventional Commits format using `kind:<type>` and `scope:<scope>` labels.

## Implementation Details

### 1. Workflow: `.github/workflows/pr-triage.yml`

Added new job `label_kind_scope` that:

- **Triggers**: On `pull_request_target` events (opened, edited, synchronize)
- **Permissions**:
  - `pull-requests: write` (to add labels)
  - `issues: write` (to create labels)

#### Job Steps:

1. **Parse PR title** - Extract type and scope using regex
2. **Create kind label** - Create `kind:<type>` if doesn't exist (green #0E8A16)
3. **Create scope label** - Create `scope:<scope>` if doesn't exist (blue #1D76DB)
4. **Add labels to PR** - Assign both labels automatically
5. **Display summary** - Show result in GitHub Actions UI

#### Supported Types:
- feat, fix, cut, doc, ci, bump, test, refactor, revert, make, chore

#### Supported Scopes:
- eos_downloader, eos_downloader.cli

### 2. Documentation: `.github/docs/PR_LABELING.md`

Comprehensive documentation covering:
- Overview of the labeling system
- Complete list of label types and scopes
- How it works (workflow explanation)
- Label colors and benefits
- PR title format requirements
- Validation rules
- Examples and use cases

### 3. Documentation Index: `.github/docs/README.md`

Created index for all GitHub-related documentation:
- Workflows & Automation section
- Development Guidelines section
- Label System explanation
- Contributing guidelines
- Links to additional resources

### 4. PR Template: `.github/pull_request_template.md`

Updated with:
- Reminder about Conventional Commits format
- Note about automatic labeling
- Example of how labels are assigned

### 5. Instructions: `.github/instructions/conventional-commit.prompt.md`

Added `<automatic-labeling>` section with:
- Principle of automatic labeling
- Label format explanation
- Workflow reference
- Example with labels
- Benefits list
- Documentation link

## Testing

Tested parsing logic with multiple PR title formats:

| PR Title | Type | Scope | Labels |
|----------|------|-------|--------|
| `feat(eos_downloader): add cache support` | feat | eos_downloader | kind:feat, scope:eos_downloader |
| `fix(eos_downloader.cli): correct error` | fix | eos_downloader.cli | kind:fix, scope:eos_downloader.cli |
| `doc: update README` | doc | (none) | kind:doc |
| `chore: cleanup files` | chore | (none) | kind:chore |

All tests passed ✅

## Label Colors

- **Kind labels**: Green (#0E8A16) - Indicates nature of change
- **Scope labels**: Blue (#1D76DB) - Indicates affected component

## Benefits

1. **Automatic Organization** - PRs categorized without manual effort
2. **Better Filtering** - Easy to find PRs by type or scope
3. **Visual Clarity** - Color-coded labels for quick identification
4. **Release Notes** - Helps generate accurate changelogs
5. **Consistency** - Enforces standardized labeling across all PRs

## Files Created/Modified

### Created:
- `.github/workflows/pr-triage.yml` (140 lines)
- `.github/docs/PR_LABELING.md`
- `.github/docs/README.md`

### Modified:
- `.github/pull_request_template.md`
- `.github/instructions/conventional-commit.prompt.md`

## Validation

- ✅ YAML syntax validated
- ✅ Parsing logic tested
- ✅ Documentation complete
- ✅ Templates updated
- ✅ Instructions synchronized

## Next Steps

1. Commit and push changes
2. Test on a real PR
3. Monitor workflow execution
4. Adjust colors/descriptions if needed
5. Gather team feedback

## Maintenance Notes

- Labels are created automatically with `--force` flag (won't change color if already exist)
- Workflow uses `steps.parse.outputs` for proper variable passing
- Summary displayed in GitHub Actions UI for transparency
- Compatible with existing semantic PR validation

## Related Files

- Workflow: `.github/workflows/pr-triage.yml`
- Documentation: `.github/docs/PR_LABELING.md`
- Index: `.github/docs/README.md`
- Template: `.github/pull_request_template.md`
- Instructions: `.github/instructions/conventional-commit.prompt.md`

---

**Implementation Status**: ✅ Complete and tested
**Ready for deployment**: Yes
**Breaking changes**: No
