simplify

simplify is a command for Claude Code from ckorhonen/claude-skills. It costs 19 tokens per session (703 once invoked), scanned A, a copy of code-simplifier, MIT.

A code-cleanup command that reviews recent changes and suggests or applies structural simplifications without changing behaviour.

In plain words
What is it for?
Use it after coding to simplify functions, conditionals, abstractions, imports, and other parts of a recent change.
Why use it?
It helps remove duplicate, unused, overcomplicated, or over-engineered code after implementation.

Command for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the claude-skills plugin — 62 skills, 4 commands, 7 agents shipped together

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 commands/ckorhonen/claude-skills/simplify
Clone the repo
git clone --depth 1 https://github.com/ckorhonen/claude-skills

Made for: Claude Code.

Or install claude-skills, the plugin that ships this one along with the rest of its 62 skills, 4 commands, 7 agents.

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 simplify

README.md
[![agentmods](https://agentmods.dev/badge/commands/ckorhonen/claude-skills/simplify.svg)](https://agentmods.dev/commands/ckorhonen/claude-skills/simplify)
Your own site
<a href="https://agentmods.dev/commands/ckorhonen/claude-skills/simplify"><img src="https://agentmods.dev/badge/commands/ckorhonen/claude-skills/simplify.svg" alt="Measured on agentmods" height="20"></a>
Per session 19 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 703 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin 97% copy Near-identical to another mod 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 $0.00019 $0.00703
Opus 5 $0.00010 $0.00351
Sonnet 5 $0.00004 $0.00141
Haiku 4.5 $0.00002 $0.00070

Measured 6d ago against content hash 6b10eaae6717, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

simplify 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 6d 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

This is a copy

97% identical to code-simplifier — 4 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

commands/simplify.md · 143 lines

How it starts

The opening of the file, as written. The whole thing — 143 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Code Simplifier

Simplify code after implementation. Find ways to make code cleaner and simpler without changing behavior.

Philosophy

  • Simpler is better
  • Less code = fewer bugs
  • Clarity over cleverness
  • Don't change behavior, only structure
  • Delete code when possible

Phase 1: Identify Recent Changes

git diff HEAD~1 --name-only
git log -1 --stat
git diff HEAD~1

Phase 2: Analyze for Simplification

Look for these patterns:

1. Duplicate Code

  • Repeated logic that can be extracted
  • Similar functions that can be merged
  • Copy-pasted code with minor variations

2. Over-Engineering

  • Abstractions used only once
  • Unnecessary wrapper functions
  • Over-parameterized functions (too many options)
  • Premature generalization

3. Dead Code

  • Unused variables
  • Unreachable branches
  • Commented-out code
  • Unused imports/dependencies

4. Complex Conditionals

  • Nested if-else chains (flatten with early returns)
  • Complex boolean expressions (extract to named variables)
  • Guard clauses that can be simplified

5. Long Functions

  • Functions > 20 lines (consider splitting)
  • Multiple responsibilities (single responsibility)
  • Too many parameters (use objects)

6. Unnecessary Complexity

  • Try-catch around code that can't fail
  • Null checks on values that can't be null
  • Defensive code for impossible cases

Phase 3: Propose Simplifications

For each finding, present:

### Simplification: [Short description]

**Location**: `file:line`
**Type**: [Duplicate/Over-engineering/Dead code/etc.]

**Current** (X lines):
```[lang]
[code block]

Simplified (Y lines):

[code block]

Benefit: [Why this is better] Risk: Low - behavior unchanged


## Phase 4: Apply Simplifications

After user approval:
1. Make one change at a time
2. Run tests after each change
3. Commit with clear message: `refactor: simplify [description]`
4. Move to next simplification

## Output Format

Simplification Report

Changes Analyzed

  • Files: [count]
  • Lines added: [count]
  • Lines removed: [count]

Simplification Opportunities

[List each opportunity with current/simplified code]

Summary

  • Simplifications found: X
  • Estimated lines reducible: Y
  • Complexity reduction: [High/Medium/Low]

Recommended Actions

  1. Apply simplification #1 (highest impact)
  2. Apply simplification #2 ...

Tests to Run After

  • [List of test commands to verify no behavior change]

Read the full file on GitHub · 143 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. 6d ago First seen · 143 lines · 19 tokens per session scan A 6b10eaae6717

Subscribe to this mod's changes

simplify is a command published in the GitHub repository ckorhonen/claude-skills (14 stars, last pushed 2mo ago), licensed MIT. It adds 19 tokens to every session and 703 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. It is 97% identical to code-simplifier, differing in 4 lines, and is treated as a copy.