Is the Code Simplification skill free?

Yes. The skill itself is free from addyosmani/agent-skills. SkillProof publishes the install command and an independent test verdict at no cost.

What is the Code Simplification SkillProof Score?

8.8/10 — installs cleanly 5/5, triggers reliably 5/5, output vs. baseline 7/10, docs & honesty 5/5.

How do I install Code Simplification?

Copy the install command from this page, run it in your terminal, and restart Claude Code. Skills live in ~/.claude/skills/ (global) or .claude/skills/ inside a project.

Can I use Code Simplification with Cursor, Copilot, Gemini CLI, Codex or other AI tools?

The SKILL.md format is native to Claude (Claude Code, Desktop, claude.ai). The instructions inside adapt to other assistants: Cursor rules, GitHub Copilot instructions, Windsurf rules, Custom GPTs, AGENTS.md for OpenAI Codex, and GEMINI.md for Google Gemini CLI — our conversion guides cover each, and the free converter on the tools page does the wrapping for you.

Code Simplification

A disciplined, five-principle process for simplifying code readability without touching behavior.

by addyosmani · addyosmani/agent-skills

Tested · Works

Install — copy the command Download source ↗

Test report

Verdict: Tested · Works
Score: 8.8/10
Tested: Jul 14, 2026
Environment: Claude Code 2.x (agent harness)
Upstream re-checked: Aug 10, 2026 · 239b284

Ran it on a real nested-if discount calculator: a careful baseline rewrite and the skill-guided rewrite both preserved behavior (checked against 12 input combinations in Node, zero mismatches), but only the skill version followed its own advice — one named priceFor() predicate instead of the baseline's unrequested new DISCOUNT_RULES registry, which is exactly the 'unnecessary abstraction' trap the skill's Red Flags section warns against.

Scored on four weighted criteria — install, triggering, output vs. baseline, docs. How scoring works

Installs cleanly 5/5
Triggers reliably 5/5
Output vs. baseline 7/10
Docs & honesty 5/5

What Code Simplification does

Guides Claude through a Chesterton's-Fence-first refactoring process: identify concrete complexity signals (deep nesting, boolean flags, generic names, duplication), simplify incrementally with explicit behavior-preservation checks, and stop before over-simplifying. Triggers on refactor-for-clarity and complexity-review requests, not on feature work or bug fixes.

How to install Code Simplification

git clone https://github.com/addyosmani/agent-skills
cd agent-skills
mkdir -p ~/.claude/skills
cp -r skills/code-simplification ~/.claude/skills/code-simplification

Skills live in ~/.claude/skills/ (global) or .claude/skills/ (per-project). Restart Claude Code after installing.

Commands — how to trigger Code Simplification

/code-simplification A disciplined, five-principle process for simplifying code readability without touching behavior.

It also activates on plain-language prompts like these:

Simplify this nested if-else checkout discount function
Refactor this module without adding unnecessary abstraction
Clean up this tangled function and flag over-engineering

Frequently asked questions

Is the Code Simplification skill free?: Yes. The skill itself is free from addyosmani/agent-skills. SkillProof publishes the install command and an independent test verdict at no cost.
Does Code Simplification work with Claude Code?: We tested it with Claude Code 2.x (agent harness) on Jul 14, 2026. Verdict: Tested · Works. Ran it on a real nested-if discount calculator: a careful baseline rewrite and the skill-guided rewrite both preserved behavior (checked against 12 input combinations in Node, zero mismatches), but only the skill version followed its own advice — one named priceFor() predicate instead of the baseline's unrequested new DISCOUNT_RULES registry, which is exactly the 'unnecessary abstraction' trap the skill's Red Flags section warns against.
What is the Code Simplification SkillProof Score?: 8.8/10 — installs cleanly 5/5, triggers reliably 5/5, output vs. baseline 7/10, docs & honesty 5/5.
How do I install Code Simplification?: Copy the install command from this page, run it in your terminal, and restart Claude Code. Skills live in ~/.claude/skills/ (global) or .claude/skills/ inside a project.
Can I use Code Simplification with Cursor, Copilot, Gemini CLI, Codex or other AI tools?: The SKILL.md format is native to Claude (Claude Code, Desktop, claude.ai). The instructions inside adapt to other assistants: Cursor rules, GitHub Copilot instructions, Windsurf rules, Custom GPTs, AGENTS.md for OpenAI Codex, and GEMINI.md for Google Gemini CLI — our conversion guides cover each, and the free converter on the tools page does the wrapping for you.