Claude Code mod

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).

45,633 starsMemory & instructions mods Plugin marketplaceIn Anthropic's plugin directoryValidates on Claude Code 2.1.316 Source

Install

Inside Claude Code
/plugin marketplace add anthropics/claude-plugins-official
/plugin install code-modernization@claude-plugins-official

Mods install like plugins. Run /reload-plugins or start a new session to load it.

What it can access

Reach
L2Writes or runs: writes files, drives Claude, writes the prompt box, reads files, persists state, draws
Sees
every prompt, every tool call
Draws in
PromptHintAbovePromptPane
Hooks
session.startui.renderui.closecommand.runprompt.submitturn.startturn.completetool.call

From a static scan of the mod's code by awesome-claude-code-mods. It shows what the code asks for, not a security review.

How Claude Code mods work

  • A mod is a plugin with a JavaScript or TypeScript module that runs inside Claude Code (version 2.1.287 or later). It can draw panes beside the transcript, a band above the prompt, buttons and toasts, restyle the spinner and tool rows, and watch or rewrite tool calls and prompts.
  • It installs like any plugin: add its marketplace with /plugin marketplace add owner/repo, then /plugin install name@marketplace.
  • Check what a mod can reach before installing: it runs with your permissions. Reach goes from drawing only, to reading files, to writing files or running processes, to the network. Run claude plugin validate on a clone to list its hooks and calls without running it.
  • Turn one off from the Installed tab in /plugin, or start Claude Code with --safe-mode to skip every customization for a session.
Claude Code docs

Details

Repository
anthropics/claude-plugins-official
Folder
plugins/code-modernization
Marketplace
claude-plugins-official
Author
Anthropic
Type
Memory & instructions mods
License
Apache-2.0
Last updated
1 November 2026
Listed in
awesome-claude-code-mods

FAQ

What is 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). It is a mod for Claude Code, from anthropics/claude-plugins-official on GitHub.

What can the code-modernization mod access?

Its widest reach is "writes or runs" (writes files, drives Claude, writes the prompt box, reads files, persists state, draws). It sees every prompt, every tool call. It draws in PromptHint, AbovePrompt, Pane. Like any mod, it runs with your permissions.

How do I install code-modernization?

Inside Claude Code (v2.1.287 or later), run /plugin marketplace add anthropics/claude-plugins-official and then /plugin install code-modernization@claude-plugins-official.

Is code-modernization popular?

anthropics/claude-plugins-official has 45,633 GitHub stars and 0 forks, and is included in 1 curated Claude Code list. It was last updated on 1 November 2026.

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