Cline SDK — released 2026-05-13 and announced by @DataChaz — is an open-source…

Brief

Cline SDK — released 2026-05-13 and announced by @DataChaz — is an open-source rebuild of Cline's agent harness (extension + CLI) available via npm i @cline/sdk. It introduces hub-backed persistent sessions and cron automations, was rebuilt using lessons from their 2024 coding-agent work, and the team claims it outperforms Claude Code on tbench.

The new Cline SDK just dropped and it changes everything 🔥

→ Rebuilt agent harness
→ Fully open SDK (npm i @cline/sdk)
→ Beats Claude Code on tbench
→ Hub-backed persistent sessions
→ Cron automations

best part?

they just open-sourced the SDK so you can build on it too👀

Cline (@cline)

Introducing the Cline SDK. We rebuilt the Cline harness for our extension and CLI from scratch using all the lessons learned since creating one of the world's first coding agents in 2024, and are open sourcing it for others to build with today.

npm i @cline/sdk

🧵

Video

— https://nitter.net/cline/status/2054580767779700775#m