Streamsy

Streamsy is a toolkit for working with Durable Streams.

Durable Streams are the data primitive for the agent loop.

Persistent, addressable, real‑time streams for building resilient agent sessions and collaborative multi-user, multi-agent systems.

Streamsy provides a server implementation of the Durable Streams protocol with:

• support for any runtime/framework that supports Web Standards fetch
• pluggable storage backends with in-memory, SQLite, and Durable Object implementations
• TypeScript interfaces for direct protocol access, including support for JSON mode with typed codecs and Standard Schema support

Start here

• Basic usage — compose a Durable Streams HTTP server, drive the protocol in-process, and choose a storage backend (memory / SQLite / Durable Object).
• JSON mode — typed JSON streams with @streamsy/json (codecs and Standard Schema).
• Durable State — typed change/control messages over collections with @streamsy/state.