Clarity.

Comments that are artifacts of the generation conversation — restated prompts, step-by-step narration, chat asides, and placeholder elisions like `// ... rest of the code here` — committed into source instead of real documentation.

AI assistants pad simple logic with comments that restate each line, step-by-step narration, defensive null ladders, and long-hand expressions where an idiom or an existing helper would do — inflating line count without adding behavior.

An AI assistant names new code with generic placeholders or a fresh convention that ignores the repository's existing identifiers and domain vocabulary, eroding readability and spawning duplicate, mis-described concepts.