Expression-level code cleanup — guard clauses, naming, magic values, conditional simplification, duplication. Language-agnostic. Out of scope: architecture, module decomposition. Use when user asks to clean code, simplify expressions, flatten nesting, or invokes /logic-cleaner.
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Universal Logic & Code Cleanliness Standards
1. Control Flow
Flattening: Maximum 2 levels of indentation per function. Extract deeper logic into helpers.
Guard Clauses: Handle edge cases and errors at the very top with early returns. Keep the happy path left-aligned.
Fail Fast: Halt execution immediately on invalid states instead of passing nulls or error flags down the stack.
2. Conditionals
Phrasing: Enforce positive phrasing; avoid double negatives (e.g., use isPending, not isNotFinished).
Extraction: Extract conditions with more than two logical operators into well-named boolean variables or functions.
Simplification: Apply De Morgan's Laws to simplify negated compound conditions (e.g., convert !(A || B) to !A && !B).
3. State & Mutation
Scope: Declare variables as close to their first use as possible. Never shadow variables from an outer scope.
Immutability: Treat function parameters as strictly read-only. Never reassign them; assign results to new variables instead.
4. Naming
Rules: Avoid abbreviations (req, idx) unless they are universal language standards (e.g., ctx in Go). Use symmetric pairs for related concepts (start/stop, open/close).
Verbs: Function names must begin with strong, specific action verbs (e.g., CalculateTotal, not ProcessData or Handle).
5. Magic Values & Hardcoding
Constants: Extract raw strings and numbers (except 0 and 1) into named constants that explain why the value exists.
Config: Inject all environment-dependent values (timeouts, retry limits, paths) via configuration. Never hardcode them.
6. Duplication (Rule of Three)
WET vs DRY: Logic may be duplicated once without abstraction (Write Everything Twice). Refactor into a shared, generic function only upon the third occurrence (Don't Repeat Yourself).
7. Out of Scope
This skill is expression-level only — intentionally narrow. Anything broader belongs to a different skill:
Module decomposition, class hierarchies, dependency direction → code-design-refactor
