Vercel's @aisdk is insanely good. Docs are fantastic. Great abstractions where you want them, doesn't force unnecessary ones, and lets you get under the hood where appropriate. Solves the hard stuff (stream parsing, tool streaming, multi-turn tool execution, error handling and healing/recovery) without forcing you into dumb patterns
It just works, it's fantastic software and delightful to use. The team ships insanely fast, and has turned PRs from me around in like 2 days, and frequently ships requested features in < 1w