fowler

fowler is a plugin for Claude Code from el-feo/ai-context. Its manifest loads nothing; the 1 skill, 2 commands it bundles cost 243 tokens per session together, scanned A, original, MIT.

A refactoring advisor based on Martin Fowler's catalog, a well-known collection of techniques for improving code structure. It identifies code smells, meaning patterns that may make code harder to maintain, and guides changes step by step with tests.

In plain words
What is it for?
Use it to review code for structural problems, plan and apply refactorings, run tests between changes, and learn refactoring techniques across programming languages.
Why use it?
It helps you improve existing code while checking that each change preserves its behavior, and explains why a particular restructuring may be appropriate.

Plugin for Claude Code

Written for Claude Code: a Claude Code plugin manifest.

Good fit Use it to review code for structural problems, plan and apply refactorings, run tests between changes, and learn refactoring techniques across programming languages.

Compare 6 plugins from other repositories ↓
Install in Claude Code
/plugin marketplace add el-feo/ai-context
/plugin install fowler
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/el-feo/ai-context

Made for: Claude Code.

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 fowler

README.md
[![agentmods](https://agentmods.dev/badge/plugins/el-feo/ai-context/fowler/github.svg)](https://agentmods.dev/plugins/el-feo/ai-context/fowler)
Your own site
<a href="https://agentmods.dev/plugins/el-feo/ai-context/fowler"><img src="https://agentmods.dev/badge/plugins/el-feo/ai-context/fowler/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 fowler

Your own site · 80×15
<a href="https://agentmods.dev/plugins/el-feo/ai-context/fowler"><img src="https://agentmods.dev/badge/plugins/el-feo/ai-context/fowler.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session not measured What this adds to a session before it is invoked.
When invoked not measured The manifest loads nothing itself; its 1 skill, 2 commands cost 243 tokens a session between them.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Security

Grade A, and why

fowler 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 1mo 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.

plugins/fowler/.claude-plugin/plugin.json · 11 lines

What it actually says

{
  "name": "fowler",
  "version": "0.2.1",
  "description": "Refactoring advisor grounded in Martin Fowler's catalog (Refactoring, 2nd ed.). Diagnoses code smells, applies refactorings step-by-step with tests between steps, and teaches when and why to use each technique — language-agnostic",
  "author": {
    "name": "Jeb Coleman"
  },
  "commands": ["./commands/fowler.md", "./commands/install-review.md"],
  "skills": ["./skills/fowler"]
}
Contents

What it installs

The manifest is a name and a version. 1 skill, 2 commands travel with it, and installing the plugin installs all of them — 243 tokens a session between them. Each is measured on its own page, and each can be installed alone.

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. 1mo ago First seen · 11 lines scan A d41bb2cf518a

Subscribe to this mod's changes

fowler is a plugin published in the GitHub repository el-feo/ai-context (12 stars, last pushed 2mo ago), licensed MIT. Its token cost is not measured: this kind of file is read by the harness, not the model. 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 2026-08-30.