Built by Inngest as an open-source TypeScript library for multi-agent systems.

AgentKit lets developers build networks of LLM agents with shared state, deterministic or LLM-based routers, and native MCP tool support.

Published as the @inngest/agent-kit npm package, used inside Node and TypeScript applications and often deployed with Inngest's durable execution platform.

First released in 2024 and receiving active releases through 2026.

It exists to make multi-agent handoffs and routing reproducible and debuggable instead of relying purely on LLM improvisation.

Requires Node.js, the separate inngest package for durable execution, and an LLM provider API key.

Open-source, runs in your own Node process and sends prompts to whichever configured LLM API.