Mixed
I've found it's not as effective as the vector index
electroly on Hacker News
In the thread “Why Cline doesn't index your codebase”, replying to this comment
Helped: Vector indexing for database context
Got in the way: Cursor's documentation indexing for JavaScript-based docs
… The first 90% I expect to be replaced by better MCP tools over time, which integrate vector indexing along with traditional indexing/exploration techniques. I've got one written to allow AI to interactively poke around the database, but I've found it's not as effective as the vector index.