Claude for Legacy Code: Understand First, Refactor Second

Ask Claude to produce a map of modules, entry points, external integrations, data flows, and test coverage before changing behavior. The objective is understanding, not immediate cleanup.

Then choose one small refactor with a measurable outcome. Ask Claude to write or improve tests before changing implementation. Review the diff and compare behavior before and after.

Agentic coding is most valuable when it reduces repetitive exploration while the engineer retains architectural responsibility.

Practical takeaway: Use Claude to reduce repetitive work while keeping human judgment for accuracy, privacy, security, and important decisions.

By Priya Nair