[FEATURE] Automated duplicate detection & fixing

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

Very often when Claude Code works on stuff, it reimplements already existing functionality or types. This is one of the most frustrating issues with the code quality on Claude Code.

Proposed Solution

Claude Code should have better context awareness and be able to automatically detect and fix duplicates. Claude should independently decide if the duplicate is warranted or not. This would help Claude code to be better aware of the code base and produce less slop.

Many IDEs already have duplicate detection, and some simple vector store & embedding implementation with semantic search could also be an option.

Alternative Solutions

_No response_

Priority

High - Significant impact on productivity

Feature Category

File operations

Use Case Example

1. Let Claude Code write code
2. It writers type User = {id: number, name: string}
3. It should detect that in another file we already have a centralized type User = {id: number, name: string} or maybe something close enough such as type User = {id: number, name: string, email: string}
4. It should make a decision to consolidate

Additional Context

This tends to happen all the time with types, zod schemas & utility functions etc etc.