Task file authoring guide for project management. Use when creating new task files, planning features, bug fixes, refactorings, or any development work that needs structured documentation. Triggers include requests to "create a task", "write a task file", "document this feature/bug", "plan this work", or when organizing development work into phases. Always creates task files in the `_tasks` directory at project root with format Task-XXX_Title.md. Analyzes codebase for similar patterns, checks dependencies, and structures work into testable phases. Global skill - works across any project or solution.