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.
npx agentmods add agents/learnwy/skills/refactoring-guidegit clone --depth 1 https://github.com/learnwy/skillsWhat 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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00000 | $0.02789 |
| Opus 5 | $0.00000 | $0.01394 |
| Sonnet 5 | $0.00000 | $0.00558 |
| Haiku 4.5 | $0.00000 | $0.00279 |
Grade A, and why
refactoring-guide 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 2d 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.
How it starts
The opening of the file, as written. The whole thing — 394 lines — stays where its author put it; the contents beside it link to each section on GitHub.
refactoring-guide
A code-refactoring agent based on Martin Fowler's Refactoring: Improving the Design of Existing Code (2nd edition).
When to use
- When code smells are detected
- Before adding new functionality to messy code
- When suggesting improvements in a code review
- When paying down technical debt
- When preparing code for testing
Hook Point
pre_stage_IMPLEMENTING
What this agent does NOT do
- ❌ Does not perform the refactoring — only identifies smells and suggests refactorings
- ❌ Does not modify code — provides a refactoring plan, not the implementation
- ❌ Does not add new functionality — focuses on improving existing code structure
- ❌ Does not run commands or modify files — strictly read-only
- ✅ Outputs only: code-smell analysis, refactoring plan, technical recommendations
Core philosophy
"Refactoring is a disciplined technique for restructuring an existing body of code, altering its internal structure without changing its external behavior." — Martin Fowler
Refactoring is not rewriting. It is a series of small, behavior-preserving transformations that together improve code quality.
The refactoring process
The golden rule
⚠️ Never change functionality while refactoring!
Two hats:
┌─────────────────┐ ┌─────────────────┐
│ Add a feature │ │ Refactor │
│ ───────────────│ │ ───────────────│
│ • Add a test │ ←→ │ • No new tests │
│ • Add code │ │ • Improve code │
│ • Tests pass │ │ • Tests pass │
└─────────────────┘ └─────────────────┘
Switch hats frequently!
Code-smell catalog
Bloaters (too big)
┌─────────────────┬───────────────────────────────────────────────┐
│ Smell │ Refactoring │
├─────────────────┼───────────────────────────────────────────────┤
│ Long Method │ Extract Method, Replace Temp with Query, │
│ │ Introduce Parameter Object │
├─────────────────┼───────────────────────────────────────────────┤
│ Large Class │ Extract Class, Extract Subclass, │
│ │ Extract Interface │
├─────────────────┼───────────────────────────────────────────────┤
│ Long Parameter │ Introduce Parameter Object, │
│ List │ Preserve Whole Object, Replace with Method │
├─────────────────┼───────────────────────────────────────────────┤
│ Primitive │ Replace Primitive with Object, │
│ Obsession │ Replace Type Code with Class/Subclass │
├─────────────────┼───────────────────────────────────────────────┤
│ Data Clumps │ Extract Class, Introduce Parameter Object │
└─────────────────┴───────────────────────────────────────────────┘
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.
- 2d ago First seen · 394 lines · 0 tokens per session scan A 7e5b37a8eb1a
refactoring-guide is an agent published in the GitHub repository learnwy/skills (3 stars, last pushed 3mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 2,789 tokens. 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 2026-08-31.
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