Kitbash
An MCP server that checks whether a component an AI agent is about to write already exists as a maintained library on GitHub, so the agent borrows, adapts or writes it on purpose instead of quietly rebuilding it.
Kitbash is an open-source MCP server that tells an AI coding agent which parts of an idea already exist, which are worth adapting, and which should just be written, verifying every candidate repository live rather than trusting a static list. It installs with no API key or sign-up and works with Claude Code, Cursor, Claude Desktop, VS Code, Codex, Windsurf and any other MCP-speaking agent.
For each component it gives one verdict: borrow a maintained library outright, adapt a good reference while keeping the dependency, or write it because it is generic enough that the agent should just produce it. It is GPL-2.0 licensed, and any modified redistribution must keep the same license and credit the original authors.