AI SDK · 2026

Wisp

Drop-in AI agent SDK for React and Next.js.

Overview

A lightweight (~12kb gzipped) AI agent SDK that lets developers define capabilities as type-safe Zod commands — Wisp handles streaming, tool-calling, and UI. Provider-agnostic with OpenAI and Anthropic support out of the box.

My role

Solo creator — SDK design, streaming engine, docs site

Highlights

01
~12kb gzipped — minimal footprint with zero unnecessary dependencies
02
Provider-agnostic: swap between OpenAI and Anthropic with one config change
03
Type-safe command system via Zod schemas with full autocomplete

Key features

Hand-rolled SSE streaming engine for real-time agent responses
Drop-in UI kit with pre-built chat components
3-file setup: define commands, create endpoint, render UI
Tool-calling support with structured Zod-validated inputs/outputs