Refactron

What it does

Refactron is a safety-first refactoring tool that helps developers analyze, refactor, and verify changes in legacy codebases without breaking behavior.

Prove that any change, your AI agent's, a codemod's, or your own, preserved behavior. Refactron runs your real tests in an isolated shadow tree and lands only on green, with a reproducible, audit-grade record of why it's safe.

Runs your real tests on a copy of your project. If anything breaks, nothing gets written. A real Claude Code session. The agent writes a migration, checks its own diff, and merges only on SAFE. The agent calls verify_change over MCP before it lands. The same gate runs in CI or on a migration. Point it at any change, from an agent, a codemod, or you. Every one gets the same gate. Apply the diff to a throwaway copy. Your tree is never touched. Point it at any change, from an agent, a codemod, or you. Every one gets the same gate. Apply the diff to a throwaway copy. Your tree is never touched. “Tests pass” can hide the truth. When the changed code was never run, we say UNPROVEN instead of…from refactron.dev

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