code-modernization

Q: How to install code-modernization?

Add a marketplace: /plugin marketplace add . Then add the config to /plugin install code-modernization@ . Finally, /plugin in Claude Code.

Q: What is code-modernization best for?

code-modernization is categorized under Development. It covers: code-review, agent.

New

30.2kOfficial PluginDevelopmentby Anthropic

Modernize legacy codebases (COBOL, legacy Java/C++, monolith web apps) with a structured preflight / assess / map / extract-rules / brief / reimagine / transform / harden workflow, an interactive topology viewer, and specialist review agents

Python3272 forks747 issuesUpdated 6/16/2026First seen 5/22/2026

Summary

This skill provides a structured workflow for modernizing legacy codebases, including COBOL, legacy Java/C++, and monolith web apps.

It guides you through preflight assessment, mapping, rule extraction, reimagination, transformation, and hardening, with an interactive topology viewer and specialist review agents to ensure quality.

Install & Usage

Add a marketplace

/plugin marketplace add <org/repo>

Install the plugin

Add the configuration to /plugin install code-modernization@<marketplace>

Manage with /plugin

/plugin

Use Cases

Modernize a COBOL mainframe application to a cloud-native Java microservices architecture.

Refactor a legacy Java/C++ monolith into modular, maintainable components with automated rule extraction.

Assess and transform a monolithic web app into a decoupled frontend and backend with API-driven design.

Generate a modernization roadmap with topology visualization and risk analysis for a legacy system.

Automate code transformation by extracting business rules from legacy code and applying them to a new framework.

Perform a preflight audit of a legacy codebase to identify technical debt and modernization blockers.

Usage Examples

/code-modernization assess path/to/legacy/cobol-app --output assessment.md

Modernize my legacy Java monolith at ./src to a Spring Boot microservices architecture using the full workflow.

Run a preflight check on the COBOL codebase in /legacy and generate a topology map with dependencies.

View source on GitHub

code-reviewagentclaude-codemcpskills

Security Audits

LicenseUnknownSourcePassRepositoryPass

Frequently Asked Questions

What is code-modernization?

This skill provides a structured workflow for modernizing legacy codebases, including COBOL, legacy Java/C++, and monolith web apps. It guides you through preflight assessment, mapping, rule extraction, reimagination, transformation, and hardening, with an interactive topology viewer and specialist review agents to ensure quality.

How to install code-modernization?

To install code-modernization: add a marketplace (/plugin marketplace add <org/repo>), then add the config to /plugin install code-modernization@<marketplace>. Finally, /plugin in Claude Code.

What is code-modernization best for?

code-modernization is a plugin categorized under Development. It is designed for: code-review, agent. Created by Anthropic.

What can I use code-modernization for?

code-modernization is useful for: Modernize a COBOL mainframe application to a cloud-native Java microservices architecture.; Refactor a legacy Java/C++ monolith into modular, maintainable components with automated rule extraction.; Assess and transform a monolithic web app into a decoupled frontend and backend with API-driven design.; Generate a modernization roadmap with topology visualization and risk analysis for a legacy system.; Automate code transformation by extracting business rules from legacy code and applying them to a new framework.; Perform a preflight audit of a legacy codebase to identify technical debt and modernization blockers..