refactoring-patterns

refactoring-patterns is a skill for Claude Code, Codex from irahardianto/awesome-agv. It costs 26 tokens per session (733 once invoked), scanned A, original, MIT.

A catalogue of techniques for changing existing code while preserving what it does.

In plain words
What is it for?
Use it to identify code smells such as long methods or circular dependencies and choose suitable refactoring patterns.
Why use it?
It helps address messy structure and technical debt through smaller, safer code changes.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: installed under .agents/ (shared by several agents).

Good fit Use it to identify code smells such as long methods or circular dependencies and choose suitable refactoring patterns.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/irahardianto/awesome-agv/refactoring-patterns
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.

Any agent
npx skills add irahardianto/awesome-agv --skill refactoring-patterns
Clone the repo
git clone --depth 1 https://github.com/irahardianto/awesome-agv

Made for: Claude Code, Codex.

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 refactoring-patterns

README.md
[![agentmods](https://agentmods.dev/badge/skills/irahardianto/awesome-agv/refactoring-patterns/github.svg)](https://agentmods.dev/skills/irahardianto/awesome-agv/refactoring-patterns)
Your own site
<a href="https://agentmods.dev/skills/irahardianto/awesome-agv/refactoring-patterns"><img src="https://agentmods.dev/badge/skills/irahardianto/awesome-agv/refactoring-patterns/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 refactoring-patterns

Your own site · 80×15
<a href="https://agentmods.dev/skills/irahardianto/awesome-agv/refactoring-patterns"><img src="https://agentmods.dev/badge/skills/irahardianto/awesome-agv/refactoring-patterns.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 26 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 733 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. Third-party audits
  • NVIDIA SkillSpector warn 7 Sept 2026
SkillSpector: 2 findings, up to medium

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

  • medium Agent Snooping · line 90
    Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.
    Fix: Remove all code or instructions that list or read other skills' files or directories. Skills should operate independently; cross-skill access is a privilege escalation.
  • medium Agent Snooping · line 91
    Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.
    Fix: Remove all code or instructions that list or read other skills' files or directories. Skills should operate independently; cross-skill access is a privilege escalation.
How audits are shown
Origin original 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 $0.00026 $0.00733
Opus 5.5 $0.00010 $0.00293
Sonnet 5.5 $0.00005 $0.00147
Haiku 4.5 $0.00003 $0.00073

Measured 1mo ago against content hash fdeed15d8113, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

refactoring-patterns 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.

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

.agents/skills/refactoring-patterns/SKILL.md · 93 lines

How it starts

The opening of the file, as written. The whole thing — 93 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Refactoring Patterns

Catalog of safe, incremental code transformation patterns.

When to Invoke

  • Executing /refactor command
  • Technical debt remediation
  • Pattern migration (e.g., callbacks → async/await)
  • Code smell resolution from static analysis findings

Code Smell Taxonomy

Structural Smells

Smell Detection Refactoring
Long method >30 lines Extract method
Large class >300 lines or >5 responsibilities Extract class
Long parameter list >4 parameters Introduce parameter object
Feature envy Method uses another class's data more than its own Move method
Data clumps Same fields appear together repeatedly Extract class
Primitive obsession Primitives where domain types belong Introduce value object

Coupling Smells

Smell Detection Refactoring
God class One class knows/does too much Extract classes by responsibility
Circular dependency A → B → A Introduce interface, dependency inversion
Inappropriate intimacy Classes access each other's internals Move method, extract interface
Shotgun surgery One change requires touching many files Move related code together

Safe Transformation Techniques

1. Characterization Tests

Before refactoring, write tests that capture current behavior:

Run existing code → record outputs → assert in tests → now refactor safely

2. Strangler Fig Pattern

Gradually replace old implementation with new:

Old Code ← requests
         ↓ gradually route to
New Code ← requests (eventually all traffic)
Old Code ← delete

3. Branch by Abstraction

  1. Create abstraction (interface) over existing implementation
  2. Modify all clients to use abstraction
  3. Create new implementation behind abstraction
  4. Switch to new implementation
  5. Remove old implementation

4. Parallel Run

Run old and new implementations simultaneously, compare outputs:

Request → Old Implementation → Response (returned to user)
       → New Implementation → Response (logged, compared)

Read the full file on GitHub · 93 lines

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 · 93 lines · 26 tokens per session scan A fdeed15d8113

Subscribe to this mod's changes

refactoring-patterns is a skill published in the GitHub repository irahardianto/awesome-agv (156 stars, last pushed 9d ago), licensed MIT. It adds 26 tokens to every session and 733 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 2026-09-03.