
How We Migrated 11 Million Users to Cline's Biggest Harness Upgrade
How Cline migrated its VS Code extension for 11 million developers to the new Cline SDK, built a safe A/B rollout, and reduced agent failures by 10x.

How Cline migrated its VS Code extension for 11 million developers to the new Cline SDK, built a safe A/B rollout, and reduced agent failures by 10x.

On February 17th, a compromised npm token was used to publish an unauthorized version of the Cline CLI. No malicious code was delivered, and the Cline VS Code and JetBrains extensions were never affected. Here's the full breakdown of what happened, what we found, and what we've changed.

We surpassed five million installations of Cline across VS Code, JetBrains, Cursor, Windsurf, and other editors through OpenVSX.

A call for contribution to establish reproducible, practical reinforcement learning environments sourced from real open source development work — with a $1M commitment to support open source maintainers.

After weeks with GPT-5.1, we discovered it's unlike any coding model we've seen. It investigates obsessively, follows structure religiously, and sustains focus across massive tasks. We adapted Cline to channel these traits into stable, long-running execution.

The rise of intelligent, tool-enabled coding agents marks a turning point in how software is written.

Open source models can rival the best—if we give them the ground to stand on.
Explore open-source, affordable Claude Code alternatives with local model support, no usage limits, and seamless VS Code compatibility for true agentic coding.

Bigger context windows don’t stop coding agents from drifting. Cline’s new Focus Chain keeps every step anchored to the goal — so even the longest tasks finish exactly where they’re meant to.
Explore top 9 Cursor AI alternatives for 2025, with open source, no-limit coding assistants that support local models and streamline workflows.
Explore Claude Code alternatives for agentic coding. Open source, affordable tools with local model support, no usage limits, and VS Code compatibility.

Cline has raised $32M in combined Series A and Seed funding, led by Emergence Capital and Pace Capital, with participation from 1984 Ventures

In today's rapidly evolving technological landscape, artificial intelligence has transformed from a futuristic concept to an essential productivity tool for software engineers. However, many organizations find themselves at a crossroads: how to harness the power of AI while maintaining security, compliance, and control over sensitive code and data. The answer lies not in restricting AI access, but in strategically implementing secure, enterprise-ready AI solutions that empower development teams

Picture this: Your senior engineers spending most of their time on high-level architecture instead of debugging nested loops. Your new hires becoming productive in days instead of months. Your entire team shipping more code with fewer bugs while actually leaving work feeling energized instead of burnt out. Sound like fantasy? It's not. It's what happens when you put a senior engineer in everyone's back pocket. I've been watching engineering teams using Cline (our autonomous coding agent for VS

Remember when installing new apps meant typing cryptic commands into a terminal, manually resolving dependencies, and praying nothing would break? That's kind of where we are with Model Context Protocol (MCP) servers right now. But not anymore. Today, I'm excited to announce Cline's MCP Marketplace - think of it as the App Store for your AI's capabilities. It's our answer to making AI superpowers accessible to everyone, not just the tech-savvy few. Why This Matters A few months ago, Anthropic

At Cline, we've scaled to 500k+ users and raised significant funding from top-tier VCs. As Head of AI, I recently interviewed a strong ML engineer candidate. Despite their solid background, I voted "no hire." Let me explain why - it reveals a broader pattern about what AI companies actually need right now, and getting this wrong can be a $200k+ mistake. The $200k Mistake: Why Hiring MLEs Too Early Kills AI Startups Here's a pattern I see repeatedly in well-funded AI startups: 1. Raise a sub

As a passionate user of Cline, I've discovered something transformative about modern software development. It's not just another tool in our engineering toolkit—it's a fundamental shift in how we approach complex problems. Through my journey of pushing the boundaries of what can be automated, I've learned that the real power lies not in complete automation, but in the synergy between human insight and AI capabilities. The more time I spend using these tools the more strongly I come to believe th