Add vector search / RAG · prompt 3 · Claude Code · week 2026-W44-vercel-template

Claude Code built it with @upstash/vector

Prompt: I need a vector database for similarity search in this app. Set it up and add an API route to upsert and query.

Grader: The agent installed @upstash/vector, added a VectorStore with an Upstash backend and an in-memory cosine fallback, built an upsert/query route at /api/vectors, and verified it against the production build, though the real Upstash path was untested because no credentials were available.

Replay of the real agent session in an isolated sandbox. Tool output is truncated for readability.