Cline Releases Cline SDK: An Open-Source Agent Runtime Now Powering Its CLI and Kanban, With IDE Extensions Being Migrated
Cline just open-sourced its agent runtime. CLI now outscores Claude Code 74.2% vs 69.4% on Terminal Benchmark 2.0.
Why it matters
Cline's SDK release democratizes access to production-grade agent infrastructure and signals a shift toward open-source agent runtimes competing with proprietary Claude Code. The performance delta on identical benchmarks matters for teams evaluating build-vs-buy on agent tooling.
The key facts
8 to knowCline SDK released as open-source TypeScript runtime (@cline/sdk)
Four-layer architecture: @cline/shared, @cline/llms, @cline/agents, @cline/core
Native support for plugins, subagents, CRON scheduling, checkpointing, MCP connectors
Cline CLI scored 74.2% on Terminal Benchmark 2.0 (Claude Opus 4.7)
Anthropic's Claude Code published 69.4% on same benchmark and model
VS Code and JetBrains extensions being migrated to SDK
Requires Node.js 22+
Installation: npm install @cline/sdk
Go to the source
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Publisher excerpt: Cline has extracted its internal agent harness into an open-source TypeScript SDK called @cline/sdk, the same runtime now powering its CLI and Kanban, with VS Code and JetBrains extensions being migrated. The SDK is structured as a four-layer stack — @cline/shared, @cline/llms, @cline/agents, and…