modernize-harden

modernize-harden is a command for Claude Code from fuxicodex/Fuxi. It costs 21 tokens per session (1,790 once invoked), scanned A, original, no licence file.

A security scan that looks for known weaknesses, leaked secrets, and unsafe code patterns, then produces a patch for human review. OWASP and CWE are security weakness catalogues, while CVE lists publicly known vulnerabilities.

In plain words
What is it for?
Use it to check legacy code for vulnerabilities, injection risks, and secrets, and to prepare remediation changes.
Why use it?
It brings security problems into the modernization work and makes proposed fixes reviewable before they are applied.

Command for Claude Code

Written for Claude Code: argument-hint in frontmatter.

Part of the code-modernization plugin — 10 commands, 8 agents shipped together

Good fit Use it to check legacy code for vulnerabilities, injection risks, and secrets, and to prepare remediation changes.

Compare 6 commands from other repositories ↓
Install with agentmods
npx agentmods add commands/fuxicodex/fuxi/modernize-harden
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo
git clone --depth 1 https://github.com/fuxicodex/Fuxi

Made for: Claude Code.

Or install code-modernization, the plugin that ships this one along with the rest of its 10 commands, 8 agents.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for modernize-harden

README.md
[![agentmods](https://agentmods.dev/badge/commands/fuxicodex/fuxi/modernize-harden/github.svg)](https://agentmods.dev/commands/fuxicodex/fuxi/modernize-harden)
Your own site
<a href="https://agentmods.dev/commands/fuxicodex/fuxi/modernize-harden"><img src="https://agentmods.dev/badge/commands/fuxicodex/fuxi/modernize-harden/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for modernize-harden

Your own site · 80×15
<a href="https://agentmods.dev/commands/fuxicodex/fuxi/modernize-harden"><img src="https://agentmods.dev/badge/commands/fuxicodex/fuxi/modernize-harden.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 21 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,790 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin unknown No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00021 $0.01790
Opus 5.5 $0.00008 $0.00716
Sonnet 5 $0.00004 $0.00358
Haiku 4.5 $0.00002 $0.00179

Measured 5d ago against content hash 6bf3b9234fad, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-28, from the pricing page.

Security

Grade A, and why

modernize-harden scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 5d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

fuxi-marketplace/plugins/fuxi-plugins/plugins/code-modernization/commands/modernize-harden.md · 155 lines

The source is not reproduced here

A licence we could not identify

The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.

Read it on GitHub

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 5d ago First seen · 155 lines · 21 tokens per session scan A 6bf3b9234fad

Subscribe to this mod's changes

modernize-harden is a command published in the GitHub repository fuxicodex/Fuxi (3,363 stars, last pushed 4d ago), with no licence file. It adds 21 tokens to every session and 1,790 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-24.