refactor

A code-cleanup guide for improving existing code while keeping its behavior unchanged. Refactoring means changing the structure of working code without changing what it does.

In plain words
What is it for?
Use it to rename code, extract functions, simplify conditions, remove duplication, and verify the result with tests, linting, and builds.
Why use it?
It reduces duplication and fragility while tests and small changes help detect accidental behavior changes.

Skill for Claude CodeCodex

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.

agentmods
npx agentmods add skills/oreum-ai/smartstack/refactor
Any agent
npx skills add oreum-ai/smartstack --skill refactor
Clone the repo
git clone --depth 1 https://github.com/oreum-ai/smartstack

Made for: Claude Code, Codex.

Per session 0 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 371 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00000 $0.00371
Opus 5 $0.00000 $0.00186
Sonnet 5 $0.00000 $0.00074
Haiku 4.5 $0.00000 $0.00037

Measured yesterday against content hash 9d1719b4d97e, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

refactor 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 yesterday.

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.

ai-rules/skills/refactor/SKILL.md · 32 lines

What it actually says

Skill: Refactor

When to use

When code works but is hard to read, duplicated, or fragile — and you want to improve its structure without changing behavior. Not for features; for making existing code cleaner and safer to change.

The golden rule

Refactoring never changes behavior. If behavior should change, that's a feature/fix — do it separately, so each diff is either "same behavior, cleaner" or "new behavior," never both.

Procedure

  1. Protect first. Ensure the code is covered by tests. If it isn't and it's risky, use test-writer to add coverage BEFORE refactoring — the tests prove you didn't change behavior.
  2. One transformation at a time. Rename, extract a function, remove duplication, simplify a conditional — each as its own small step. Run tests/lint after each step.
  3. Keep the diff focused. Don't reformat unrelated lines; it hides the real change.
  4. Follow existing patterns. Move shared logic into the right home rather than copy-pasting.
  5. Don't break the public shape. Keep function signatures / API contracts stable unless the task allows changing them.
  6. Verify. All tests green; lint/build clean; behavior identical.

Good refactor targets

  • Duplicate fetches that should share a cached value.
  • Repeated validation/guard logic that could be one helper.
  • Long functions mixing data, logic, and presentation.
  • Dead code, unclear names, deep nesting.

Checklist

  • Covered by tests before starting.
  • Behavior unchanged (tests still green, same outputs).
  • One transformation per step, verified each time.
  • Follows repo patterns; diff focused; quality gate clean.
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. yesterday First seen · 32 lines · 0 tokens per session scan A 9d1719b4d97e

Subscribe to this mod's changes

refactor is a skill published in the GitHub repository oreum-ai/smartstack (5 stars, last pushed 3mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 371 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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