code-simplifier

A wrapper that asks an official code-simplifier agent to make existing code easier to read and maintain while preserving its behavior. TDD means test-driven development; this tool may be used during a broader development workflow that includes such steps.

In plain words
What is it for?
Use it to simplify recently changed code or a specified file, folder, or code section, then review the differences and rerun tests.
Why use it?
It gives code cleanup a defined scope and process, so redundant logic, deep nesting, unclear names, and complicated conditions can be addressed without changing the public interface.

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/kopp0510/claude-dd/code-simplifier
Any agent
npx skills add kopp0510/claude-dd --skill code-simplifier
Clone the repo
git clone --depth 1 https://github.com/kopp0510/claude-dd

Made for: Claude Code, Codex.

Per session 78 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 726 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 $0.00078 $0.00726
Opus 5 $0.00039 $0.00363
Sonnet 5 $0.00016 $0.00145
Haiku 4.5 $0.00008 $0.00073

Measured 2d ago against content hash 10be2cdddc38, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

code-simplifier 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.

skills/code-simplifier/SKILL.md · 53 lines

What it actually says

Code Simplifier — 官方 agent 包裝器

本 skill 只負責介面層:定範圍 → 調用官方 code-simplifier agent → 呈現結果。 簡化邏輯全在 agent 內,不在此重複。

範圍決定

  • 7 步開發迴圈步驟 3(最常見):範圍 = 該功能段落新增/修改的程式碼(git diff HEAD~1 或使用者指明的段落),不詢問,直接執行
  • 使用者指明檔案/目錄/片段:照指示,不追問
  • 範圍不明:問一題 —「要簡化哪個範圍?(預設:最近修改的檔案)」,其餘參數用預設

預設不含測試檔;使用者要求才包含。

Agent 調用

依序嘗試 subagent_type

  1. code-simplifier:code-simplifier(plugin 命名空間)
  2. code-simplifier(本地 ~/.claude/agents/code-simplifier.md

兩者皆回 Agent type not found → 停下,請使用者跑 ./install-dd-pipeline.sh 補齊。

Prompt 模板:

請簡化以下程式碼,提高可讀性與可維護性,保留所有功能:

範圍:{檔案清單或片段}

重點:降低圈複雜度、改善命名、移除冗餘、簡化條件(early return、減少巢狀)。
約束:不改公開 API 簽名;有測試必須全過。
輸出:簡化摘要 + 關鍵變更的 Before/After 對比。

結果呈現

轉述 agent 的簡化摘要與 Before/After 對比。統計數字只引用 agent 實際回報的, 沒有就不列 — 禁止自行估算複雜度指標。

簡化後提醒(在 7 步迴圈中則直接續行步驟 4):用 git diff 審查變更,重跑測試確認行為不變。

範圍外

  • 架構層重構(模組拆分、設計模式)、效能調校 — 超出簡化範疇,明說不做
  • 第三方 / 生成的程式碼 — 不修改
  • 效能關鍵段落 — 「看似複雜但高效」的寫法保留,標註說明即可
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. 2d ago First seen · 53 lines · 78 tokens per session scan A 10be2cdddc38

Subscribe to this mod's changes

code-simplifier is a skill published in the GitHub repository kopp0510/claude-dd (6 stars, last pushed 2d ago), licensed MIT. It adds 78 tokens to every session and 726 once invoked, about $0.0004 per session on Opus 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 2026-08-31.

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