Perhaps it would help if I include the quote, so from
Vibe Coding pages 165-166:
> [IDEs index] your code base with sophisticated proprietary analysis and then serve that index to any tool that needs it, typically via LSP, the Language Services Protocol. The indexing capabilities of IDEs will remain important in the vibe coding world as (human) IDE usage declines. Those indexes will help AIs find their way around your code, like they do for you.
> ...It will almost always be easier, cheaper, and more accurate for AI to make a refactoring using an IDE or large-scale refactoring tool (when it can) than for AI to attempt that same refactoring itself.
> Some IDEs, such as IntelliJ, now host an MCP server, which makes their capabilities accessible to coding agents.