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Cline shipped @cline/sdk on May 13. The agent runtime that’s been running inside Cline’s VS Code extension across 5M+ installs is now a standalone TypeScript package. npm i @cline/sdk and you’ve got it. The team migrated their own CLI and Kanban onto the SDK first; VS Code and JetBrains extensions are next in line.

What’s inside @cline/sdk

Full agent loop in one package — LLM calls, tool orchestration, file diff engine, session persistence, multi-agent coordination, scheduling. Layered design: install the whole stack with @cline/sdk, or grab individual sub-packages when you only need one piece. Plug in whichever model provider you want underneath.

Typical use case: you’re building a coding agent that lives outside an IDE — a CLI, a Slack bot, a CI checker, a Kanban-style task runner — and you don’t want to rewrite tool calling and context management from scratch. You install the SDK and inherit a year of production hardening.

Why it matters

Cline raised $32M from Emergence Capital and Pace Capital and just committed $1M in credits to open-source projects. The SDK puts them head-to-head with Anthropic’s Agent SDK and LangChain’s Open SWE for the runtime layer underneath every coding agent. The difference: Cline already ships to 5 million developers, so this isn’t a clean-room framework — it’s the harness that’s been hardening in production for a year, with 57K GitHub stars of bug reports baked in.

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