What kinds of codebases can it handle?

It targets legacy codebases, including COBOL, legacy Java and C++, and monolithic web applications.

What is the topology viewer for?

It is an interactive viewer that lets you explore the structure of the codebase being modernized.

Do I need to review the agent's changes?

The plugin includes specialist review agents that examine the work, but you can follow along at each stage of the workflow.

code-modernization

PackProductivity

The code modernization plugin gives an AI agent a structured workflow for updating legacy codebases such as COBOL, legacy Java or C++, and monolithic web apps. It walks a project through preflight, assess, map, extract-rules, brief, reimagine, transform, and harden stages, and includes an interactive topology viewer and specialist review agents.

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Have an AI agent setup that supports installing plugins.

What your AI can do with it

Runs a structured preflight / assess / map / extract-rules / brief / reimagine / transform
Modernizes COBOL, legacy Java/C++, and monolithic web apps
Provides an interactive topology viewer for exploring the codebase
Includes specialist review agents that check work at each stage

Getting started

Have an AI agent setup that supports installing plugins.
Add the code-modernization plugin to your agent's configuration.
Point the agent at the legacy codebase you want to modernize.
Start the workflow and follow the preflight, assess, and later stages as the agent guides them.

Signals

GitHub stars: 37k
Forks: 4k
Last commit: Sep 2026

Questions

What kinds of codebases can it handle?: It targets legacy codebases, including COBOL, legacy Java and C++, and monolithic web applications.
How does the workflow work?: It follows a structured sequence: preflight, assess, map, extract-rules, brief, reimagine, transform, and harden, so modernization happens step by step rather than all at once.
What is the topology viewer for?: It is an interactive viewer that lets you explore the structure of the codebase being modernized.
Do I need to review the agent's changes?: The plugin includes specialist review agents that examine the work, but you can follow along at each stage of the workflow.

Advanced

Item type: plugin
Key: anthropics-claude-plugins-official-code-modernization
Source: github.com/anthropics/claude-plugins-official

github.com/anthropics/claude-plugins-official