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 🧵

We tested @OpenAI's new WebSocket connection mode for the Responses API into Cline and the early numbers are wild. Instead of resending full context every turn, WebSocket mode keeps a persistent connection, sends only incremental inputs. With 5.2 Codex results vs the standard API: → ~15% faster on simple tasks → ~39% faster on complex multi-file workflows → Best cases hitting 50% faster WebSocket handshake adds slight TTFT overhead on short tasks, but it gets amortized fast. On heavier workloads with dozens of tool calls, the speed gains are massive. Still expanding our test sample, but this is a very promising step forward for every Cline user. Faster AI coding is coming.