code-modernization

Guided modernization for any legacy codebase: start with /modernize, get an assessment, an interactive map, the business rules mined from the code, and a plan you approve, then an upgrade, a rewrite or a rebuild with independent proof that the new code behaves like the old. Includes security hardening, a one-page report, specialist agents, and an optional live progress pane (early access).

Install

If the official marketplace isn’t added yet, run

Category: Development
Author: Anthropic
GitHub: anthropics/claude-plugins-official

Good for

Assess a legacy codebase: inventory, complexity, debt and security
Get an interactive map and business rules mined from the code with file:line citations
Upgrade, rewrite or rebuild the system from a plan you approve
Prove the new code behaves like the old by rerunning tests and comparing outputs

Getting started

Run /plugin install code-modernization@claude-plugins-official
Open a folder for the work, type /code-modernization:modernize and answer a few short questions
Follow the next-step line each command ends with; run modernize-status any time to see where you are

Before you install

Some steps start many agents at once, so expect real usage on a large system; pilot on one module first. Commands never edit the legacy source and write only to analysis/ and modernized/.

Summarized by AI from the project docs; check the official docs before relying on it.

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