# Code Simplifier

> Community Code Simplification Best Practices

- Skill: `comeonoliver/code-simplifier-2` (Agent Skill)
- Install (CLI): `npx skillmds@latest add comeonoliver/code-simplifier-2`
- Raw SKILL.md: https://api.skillmd.com/api/skills/comeonoliver/code-simplifier-2/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: ComeOnOliver (https://skillmd.com/u/comeonoliver)
- Updated: 2026-09-22
- Page: https://skillmd.com/skills/comeonoliver/code-simplifier-2

---

# Community Code Simplification Best Practices

Comprehensive code simplification guide for AI agents and LLMs. Contains 47 rules across 8 categories, prioritized by impact from critical (context discovery, behavior preservation) to incremental (language idioms). Each rule includes detailed explanations, real-world examples comparing incorrect vs. correct implementations, and specific impact metrics.

## Core Principles

1. **Context First**: Understand project conventions before making any changes
2. **Behavior Preservation**: Change how code is written, never what it does
3. **Scope Discipline**: Focus on recently modified code, keep diffs small
4. **Clarity Over Brevity**: Explicit, readable code beats clever one-liners

## When to Apply

Reference these guidelines when:
- Simplifying or cleaning up recently modified code
- Reducing nesting, complexity, or duplication
- Improving naming and readability
- Applying language-specific idiomatic patterns
- Reviewing code for maintainability issues

## Rule Categories by Priority

| Priority | Category | Impact | Prefix | Rules |
|----------|----------|--------|--------|-------|
| 1 | Context Discovery | CRITICAL | `ctx-` | 4 |
| 2 | Behavior Preservation | CRITICAL | `behave-` | 6 |
| 3 | Scope Management | HIGH | `scope-` | 5 |
| 4 | Control Flow Simplification | HIGH | `flow-` | 9 |
| 5 | Naming and Clarity | MEDIUM-HIGH | `name-` | 6 |
| 6 | Duplication Reduction | MEDIUM | `dup-` | 5 |
| 7 | Dead Code Elimination | MEDIUM | `dead-` | 5 |
| 8 | Language Idioms | LOW-MEDIUM | `idiom-` | 7 |

## Quick Reference

### 1. Context Discovery (CRITICAL)

- [`ctx-read-claude-md`](references/ctx-read-claude-md.md) - Always read CLAUDE.md before simplifying
- [`ctx-detect-lint-config`](references/ctx-detect-lint-config.md) - Check for linting and formatting configs
- [`ctx-follow-existing-patterns`](references/ctx-follow-existing-patterns.md) - Match existing code style in file and project
- [`ctx-project-over-generic`](references/ctx-project-over-generic.md) - Project conventions override generic best practices

### 2. Behavior Preservation (CRITICAL)

- [`behave-preserve-outputs`](references/behave-preserve-outputs.md) - Preserve all return values and outputs
- [`behave-preserve-errors`](references/behave-preserve-errors.md) - Preserve error messages, types, and handling
- [`behave-preserve-api`](references/behave-preserve-api.md) - Preserve public function signatures and types
- [`behave-preserve-side-effects`](references/behave-preserve-side-effects.md) - Preserve side effects (logging, I/O, state changes)
- [`behave-no-semantics-change`](references/behave-no-semantics-change.md) - Forbid subtle semantic changes
- [`behave-verify-before-commit`](references/behave-verify-before-commit.md) - Verify behavior preservation before finalizing

### 3. Scope Management (HIGH)

- [`scope-recent-code-only`](references/scope-recent-code-only.md) - Focus on recently modified code only
- [`scope-minimal-diff`](references/scope-minimal-diff.md) - Keep changes small and reviewable
- [`scope-no-unrelated-refactors`](references/scope-no-unrelated-refactors.md) - No unrelated refactors
- [`scope-no-global-rewrites`](references/scope-no-global-rewrites.md) - Avoid global rewrites and architectural changes
- [`scope-respect-boundaries`](references/scope-respect-boundaries.md) - Respect module and component boundaries

### 4. Control Flow Simplification (HIGH)

- [`flow-early-return`](references/flow-early-return.md) - Use early returns to reduce nesting
- [`flow-guard-clauses`](references/flow-guard-clauses.md) - Use guard clauses for preconditions
- [`flow-no-nested-ternaries`](references/flow-no-nested-ternaries.md) - Never use nested ternary operators
- [`flow-explicit-over-dense`](references/flow-explicit-over-dense.md) - Prefer explicit control flow over dense expressions
- [`flow-flatten-nesting`](references/flow-flatten-nesting.md) - Flatten deep nesting to maximum 2-3 levels
- [`flow-single-responsibility`](references/flow-single-responsibility.md) - Each code block should do one thing
- [`flow-positive-conditions`](references/flow-positive-conditions.md) - Prefer positive conditions over double negatives
- [`flow-optional-chaining`](references/flow-optional-chaining.md) - Use optional chaining and nullish coalescing
- [`flow-boolean-simplification`](references/flow-boolean-simplification.md) - Simplify boolean expressions

### 5. Naming and Clarity (MEDIUM-HIGH)

- [`name-intention-revealing`](references/name-intention-revealing.md) - Use intention-revealing names
- [`name-nouns-for-data`](references/name-nouns-for-data.md) - Use nouns for data, verbs for actions
- [`name-avoid-abbreviations`](references/name-avoid-abbreviations.md) - Avoid cryptic abbreviations
- [`name-consistent-vocabulary`](references/name-consistent-vocabulary.md) - Use consistent vocabulary throughout
- [`name-avoid-generic`](references/name-avoid-generic.md) - Avoid generic names
- [`name-string-interpolation`](references/name-string-interpolation.md) - Prefer string interpolation over concatenation

### 6. Duplication Reduction (MEDIUM)

- [`dup-rule-of-three`](references/dup-rule-of-three.md) - Apply the rule of three
- [`dup-no-single-use-helpers`](references/dup-no-single-use-helpers.md) - Avoid single-use helper functions
- [`dup-extract-for-clarity`](references/dup-extract-for-clarity.md) - Extract only when it improves clarity
- [`dup-avoid-over-abstraction`](references/dup-avoid-over-abstraction.md) - Prefer duplication over premature abstraction
- [`dup-data-driven`](references/dup-data-driven.md) - Use data-driven patterns over repetitive conditionals

### 7. Dead Code Elimination (MEDIUM)

- [`dead-remove-unused`](references/dead-remove-unused.md) - Delete unused code artifacts
- [`dead-delete-not-comment`](references/dead-delete-not-comment.md) - Delete code, never comment it out
- [`dead-remove-obvious-comments`](references/dead-remove-obvious-comments.md) - Remove comments that state the obvious
- [`dead-keep-why-comments`](references/dead-keep-why-comments.md) - Keep comments that explain why, not what
- [`dead-remove-todo-fixme`](references/dead-remove-todo-fixme.md) - Remove stale TODO/FIXME comments

### 8. Language Idioms (LOW-MEDIUM)

- [`idiom-ts-strict-types`](references/idiom-ts-strict-types.md) - Use strict types over any (TypeScript)
- [`idiom-ts-const-assertions`](references/idiom-ts-const-assertions.md) - Use const assertions and readonly (TypeScript)
- [`idiom-rust-question-mark`](references/idiom-rust-question-mark.md) - Use ? for error propagation (Rust)
- [`idiom-rust-iterator-chains`](references/idiom-rust-iterator-chains.md) - Use iterator chains when clearer (Rust)
- [`idiom-python-comprehensions`](references/idiom-python-comprehensions.md) - Use comprehensions for simple transforms (Python)
- [`idiom-go-error-handling`](references/idiom-go-error-handling.md) - Handle errors immediately (Go)
- [`idiom-prefer-language-builtins`](references/idiom-prefer-language-builtins.md) - Prefer language and stdlib builtins

## Workflow

1. **Discover context**: Read CLAUDE.md, lint configs, examine existing patterns
2. **Identify scope**: Focus on recently modified code unless asked to expand
3. **Apply transformations**: Use rules in priority order (CRITICAL first)
4. **Verify behavior**: Ensure outputs, errors, and side effects remain identical
5. **Keep diffs minimal**: Small, focused changes that are easy to review

## How to Use

Read individual reference files for detailed explanations and code examples:

- [Section definitions](references/_sections.md) - Category structure and impact levels
- [Rule template](assets/templates/_template.md) - Template for adding new rules

## Reference Files

| File | Description |
|------|-------------|
| [references/_sections.md](references/_sections.md) | Category definitions and ordering |
| [assets/templates/_template.md](assets/templates/_template.md) | Template for new rules |
| [metadata.json](metadata.json) | Version and reference information |