vector-databases

On one June Tuesday, money poured into startups all selling AI-agent 'memory.' The word covers at least four different technical products, and the frontier labs are absorbing the easiest of them as a free feature.

Every agent-memory tutorial opens with a vector DB. That is a product opinion, not a default. Here is what mature agent runtimes actually use, and the narrow window where Qdrant or sqlite-vec earns its keep.