Claude Offers a Six-Step Guide to Replacing Legacy Code

Anthropic has published a field guide on managing AI-driven code modernization projects using Claude Code, arguing that while autonomous agents can slash rewrite timelines from years to weeks, the real bottleneck is no longer writing the code. Instead, the friction has shifted to organisational change management, regulatory approval, and deciding what your system actually needs to do before you unleash an army of subagents on it.

• Anthropic breaks the preparation phase into six distinct steps, starting with defining a clear target and a strict certificate of correctness that can be evaluated without human intervention.
• The guide stresses that traditional code reviews break down under agentic velocity, requiring pre-agreed promotion policies and tiered review paths keyed to blast radius.
• For heavily regulated industries, success depends on top-down alignment so that leadership shares the risk of automated deployments rather than leaving individual approvers exposed.

Why should I care? Could be big
Useful methodology for a future you might face, provided your compliance team stops crying long enough to read it.

Read the original: How to prepare for AI-driven code modernization projects