model: sonnet name: workflow-checkpoint-refactor description: | Multi-phase refactoring with persistent checkpoint files that survive context limits. Use when refactoring spans 10+ files, requires multiple phases, or risks hitting conversation context limits. Each phase reads/writes a plan file, enabling resume from any point. Supports "continue the refactor" across sessions. args: "[--init|--continue|--status|--phase=N]" allowed-tools: Bash(git status *), Bash(git diff *), Bash(git log *), Bash(git add *), Bash(git commit *), Bash(npm run *), Bash(npx *), Bash(uv run *), Bash(cargo *), Read, Write, Edit, Grep, Glob, Task, TodoWrite argument-hint: "--init to create plan, --continue to resume, --status to check progress" created: 2026-02-08 modified: 2026-02-14 reviewed: 2026-02-14

/workflow:checkpoint-refactor

Multi-phase refactoring with persistent state that survives context limits and session boundaries.

When to Use This Skill

Context

• Repo root: !git rev-parse --show-toplevel
• Plan file exists: !find . -maxdepth 1 -name REFACTOR_PLAN.md
• Git status: !git status --porcelain
• Recent commits: !git log --oneline --max-count=5

Parameters

• --init: Create a new refactoring plan interactively
• --continue: Resume from the last completed phase
• --status: Show current plan progress
• --phase=N: Execute a specific phase

Plan File Format

The plan file (REFACTOR_PLAN.md) serves as persistent state:

# Refactor Plan: {description}

Created: {date}
Last updated: {date}
Base commit: {hash}

## Overview
{What is being refactored and why}

## Phase 1: {phase name}
- **Status**: done | in-progress | pending | needs-review
- **Files**: file1.ts, file2.ts, file3.ts
- **Description**: {what this phase does}
- **Acceptance criteria**: {how to verify success}
- **Result**: {summary of changes made, filled in after completion}

## Phase 2: {phase name}
- **Status**: pending
- **Files**: file4.ts, file5.ts
- **Description**: {what this phase does}
- **Acceptance criteria**: {how to verify success}
- **Result**: {empty until completed}

...

Execution

Execute this multi-phase refactoring workflow:

Step 1: Initialize refactoring plan (--init mode)

If --init flag provided:

1. Analyze scope: Read files to be refactored, understand dependencies
2. Define phases where each:
   • Touches 3-7 files (bounded scope)
   • Has clear acceptance criteria (tests, type check)
   • Can be committed independently
   • Builds on previous phases
3. Write plan file: Create REFACTOR_PLAN.md at repo root
4. Record base commit: git log --format='%H' -1

Phase ordering: Shared utilities/types first, leaf components last, tests alongside implementation.

Step 2: Resume existing refactor (--continue mode)

If --continue flag provided:

1. Read REFACTOR_PLAN.md
2. Find next pending phase (status pending or needs-review)
3. Verify all prior phases are done
4. Execute phase (go to Step 4)

Step 3: Check progress (--status mode)

If --status flag provided:

1. Read REFACTOR_PLAN.md
2. Parse plan and display status table with phases, descriptions, statuses, file counts
3. Exit

Step 4: Execute target phase (--phase=N or selected via Step 2)

For each phase:

1. Read context from plan file (current phase's details)
2. Read only the files listed for this phase
3. Implement changes according to phase description
4. Validate with appropriate tool (tsc, ty check, cargo check, or npm/pytest test)
5. If validation fails:
   • Fix errors if straightforward
   • If complex, mark phase as needs-review with error details
   • Commit partial work with WIP: prefix
6. If validation passes:
   • Update plan file: set status to done, write result summary
   • Commit: git add -u && git commit -m "refactor phase N: {description}"
7. If more phases remain, proceed to next phase or suggest --continue

Step 5: Sub-agent delegation (for large phases)

For phases with 7+ files, delegate to Task sub-agent with:

• File list to modify
• Phase description and acceptance criteria
• Instructions: run validation, update plan file, stage/commit changes
• If validation fails: mark phase as needs-review with error details

Recovery Patterns

Agentic Optimizations

Quick Reference

Related Skills

• code-review-checklist - Review refactored code
• refactoring-patterns - Refactoring techniques