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---
name: changelog-management
description: Maintain project documentation including CHANGELOG.md, FILETREE.md, and FAILURELOG.md. Use this skill when making code changes, adding features, fixing bugs, restructuring files/directories, or when initial solutions fail. This skill ensures consistent documentation of all changes using Keep a Changelog format with semantic versioning.
---
# Changelog and Documentation Management
## Purpose
This skill provides systematic guidance for maintaining three mandatory project documentation files: CHANGELOG.md, FILETREE.md, and FAILURELOG.md. It ensures consistent tracking of all code changes, structural modifications, and debugging attempts using industry-standard formats.
## When to Use This Skill
Trigger this skill when:
- Making any code changes, feature additions, or bug fixes
- Adding, removing, or restructuring files or directories
- Initial solutions fail and debugging is required
- Completing any development task that affects the project state
## Documentation Requirements
### CHANGELOG.md - Change Tracking
**Update CHANGELOG.md for every code modification.**
Follow [Keep a Changelog](https://keepachangelog.com/) format with semantic versioning:
- Use standard categories: Added, Changed, Deprecated, Removed, Fixed, Security
- Include date stamps (YYYY-MM-DD) and version numbers for releases
- Reference GitHub issues/PRs when applicable
- Write clear, concise descriptions of changes
- Group related changes under appropriate category headings
### FILETREE.md - Structure Documentation
**Update FILETREE.md for any structural changes.**
Maintain accurate project structure representation:
- Add entries when creating new files or directories
- Remove entries when deleting files or directories
- Update paths when restructuring
- Include brief descriptions for new directories or significant files
- Keep the tree structure accurate and readable
### FAILURELOG.md - Debugging History
**Document all failed attempts when initial solutions don't work.**
Include comprehensive debugging information:
- What was tried (approach, code, commands)
- Error messages encountered (full stack traces when relevant)
- Root cause analysis (why it failed)
- Resolution approach (what finally worked)
- Lessons learned to prevent repeating the same debugging cycles
This is essential for complex integration issues and helps maintain institutional knowledge.
## Changelog Entry Format
Use this structure for all CHANGELOG.md entries:
```markdown
## [Version] - YYYY-MM-DD
### Added
- New features or functionality
- New files, endpoints, or capabilities
- New dependencies or tools
### Changed
- Modifications to existing features
- Refactoring or improvements
- Updated dependencies or configurations
### Deprecated
- Features marked for future removal
- Old APIs or endpoints being phased out
### Removed
- Deleted features, files, or functionality
- Removed dependencies
### Fixed
- Bug fixes and error corrections
- Performance issue resolutions
- Corrected behavior
### Security
- Security patches and improvements
- Vulnerability fixes
- New security features or validations
```
### Example Entry
```markdown
## [1.2.0] - 2025-11-15
### Added
- Customer search endpoint with fuzzy matching (#123)
- Export functionality for animal records to CSV format
- Automated backup system with daily scheduling
### Changed
- Updated Prisma client to v5.7.0 for performance improvements
- Refactored authentication middleware for better error handling
### Fixed
- Resolved memory leak in file upload handler (#145)
- Fixed date formatting issues in customer reports
- Corrected phone number validation regex
### Security
- Added rate limiting to prevent API abuse
- Implemented input sanitization for search queries
```
## Version Management
Apply semantic versioning (MAJOR.MINOR.PATCH) consistently:
- **MAJOR**: Breaking API changes, incompatible updates
- **MINOR**: New features that are backward compatible
- **PATCH**: Bug fixes that are backward compatible
- Tag releases in git with version numbers (e.g., `v1.2.0`)
### Version Increment Guidelines
Increment version numbers based on change significance:
- Breaking changes → increment MAJOR (1.2.3 → 2.0.0)
- New features → increment MINOR (1.2.3 → 1.3.0)
- Bug fixes → increment PATCH (1.2.3 → 1.2.4)
## Project-Specific Considerations
### API Changes
When modifying APIs:
- Document all endpoint modifications in Changed or Added
- Include request/response schema changes
- Note deprecation timelines for removed features
- Provide migration examples for breaking changes
### Database Schema Updates
When updating database schemas:
- Document migration scripts and procedures
- Note data transformation requirements
- Include rollback procedures for critical changes
- Specify Prisma version compatibility
### Performance Improvements
When optimizing performance:
- Document changes with before/after metrics when available
- Include configuration changes that affect performance
- Note any new hardware or dependency requirements
- Quantify improvements (e.g., "Reduced load time by 40%")
### Security Updates
When addressing security:
- Use the Security category in CHANGELOG.md
- Reference CVE numbers if applicable
- Describe the vulnerability and fix without exposing exploits
- Include upgrade instructions if dependencies are updated
## Workflow Integration
### Standard Development Workflow
1. Make code changes or add features
2. Update CHANGELOG.md with appropriate category entries
3. Update FILETREE.md if files/directories were added or removed
4. Commit changes with descriptive commit message
5. Reference the changelog entry in PR description
### Debugging Workflow
1. Attempt solution and encounter failure
2. Document attempt in FAILURELOG.md immediately:
- Timestamp the entry
- Describe what was tried
- Include error messages
- Note hypothesis about cause
3. Try alternative solution
4. Update FAILURELOG.md with resolution
5. Update CHANGELOG.md with the fix
### Release Workflow
1. Review all [Unreleased] entries in CHANGELOG.md
2. Determine appropriate version number using semantic versioning
3. Replace [Unreleased] with [Version] - YYYY-MM-DD
4. Create git tag with version number
5. Update any version references in package.json or similar files
## Best Practices
- **Be specific**: Avoid vague descriptions like "Fixed bugs" or "Updated code"
- **Group related changes**: Combine related modifications under a single bullet point
- **Use present tense**: Write "Add feature" not "Added feature"
- **Include context**: Mention the affected component or file when helpful
- **Link issues**: Reference GitHub issues/PRs for traceability
- **Update immediately**: Don't batch documentation updates; maintain them with code changes
- **Review before commit**: Ensure documentation accurately reflects all changes made
## Common Pitfalls to Avoid
- Forgetting to update CHANGELOG.md for "small" changes
- Using inconsistent category names (stick to the six standard categories)
- Placing entries in wrong categories (e.g., bug fix in Added instead of Fixed)
- Missing FILETREE.md updates when adding new directories
- Skipping FAILURELOG.md documentation during difficult debugging sessions
- Using incorrect date format (must be YYYY-MM-DD)
- Incrementing version numbers incorrectly