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Diptish09 (2026-05-13) contrasts quick agent demos with the deeper work of…

Brief

Diptish09 (2026-05-13) contrasts quick agent demos with the deeper work of rebuilding a production harness after scale failures, asserting the Cline SDK is the latter. Cline announced the open-source SDK the same day, saying they rewrote their extension and CLI harness from scratch based on lessons since launching a coding agent in 2024, and released it as @cline/sdk.

Source evidence

There’s a big difference between:

building an agent demo

and rebuilding the entire harness
after learning what breaks at scale

The Cline SDK feels like it came from the second category

That’s what makes this interesting

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