Legacy Code Refactoring Tools: How AI Planning Prevents Disasters
Legacy code is where AI-assisted refactoring becomes dangerous. One wrong move breaks production. Here's how to modernize 100K+ line codebases safely with AI planning.
Map hidden dependencies
4-stage FileFinderWorkflow discovers import chains, circular dependencies, and cross-module references before you touch any code. Know the blast radius of every change.
Explore file discoveryMulti-model migration plans
Generate migration strategies from GPT-5.2, Claude Sonnet 4.5, and Gemini. Each model brings a different perspective—merge the best approaches with human review.
Learn about planningMerge instructions for safety
Write plain-English merge instructions to combine plans: "Prefer GPT-5.2 rollback strategy, use Gemini test coverage." Control exactly how changes are synthesized.
See merge instructionsIncremental execution
Execute migration plans step-by-step in the integrated terminal. Each change is deployable and testable. Feature flags and rollback plans built into every stage.
Terminal workflowsRelated Solutions
Explore more ways PlanToCode solves complex development challenges
Large Refactors with Claude Code on macOS
Guide Claude Code through system-wide refactors without breaking dependencies
Bug Triage with Cursor on Windows
Find root causes faster with architectural context Cursor doesn't have
Incident Response & Production Debugging
When every second counts, AI needs full system context
Learn moreStart Modernizing Your Legacy Code
Discover dependencies, plan migrations, and execute with confidence.