Cline v4.0.0 Changelog

This is a major update that completely rebuilds how Cline operates behind the scenes. If you use Cline to help you code, this update matters because it makes the AI assistant much more stable, organized, and adaptable to your specific workflow—while also introducing a new marketplace to easily add new features.

What's new

• A new core engine: Cline now runs on a shared foundation called the Cline SDK. Think of it like swapping out a car's engine for a much more powerful, standardized one while you're driving. It handles all the AI's thinking, tool usage, and memory.
• ClinePass: A new account and subscription system that makes it easier to log in, pick your AI models, and handle billing without confusing errors.
• The Customize Marketplace: A brand-new store inside the extension where you can browse, install, and manage "Plugins," "Skills," and "MCP servers" (external tools that let the AI do extra things, like check databases).
• Cline Plugins: You can now install add-ons that teach Cline new tricks. Plugins let you connect outside services and create custom workflows so Cline can adapt to exactly how you work, rather than just writing code.
• Message queuing: If you send a message while Cline is still working on a previous task, it will now save your new message in a queue instead of ignoring it. You can even cancel queued messages before they run.
• Edit past messages: You can now edit your previous chat messages and have Cline regenerate its answer based on your edits. There are also clearer buttons to reset the chat or your code.
• More AI models: The model picker (the menu where you choose which AI brain to use) now supports a lot more providers and models, including new options from Fireworks, Kimi, Qwen, MiniMax, and OpenAI-compatible setups.

Improvements

• Smoother Plan/Act switching: Cline has two modes—planning what to do, and actually doing it. Switching between these modes is now seamless and automatically continues your work without skipping a beat.
• Better settings menu: The menu for picking AI providers and models is much cleaner. Instead of having different screens for every single AI company, it now uses a shared, simplified layout.
• Safer terminal commands: When Cline runs code in your computer's terminal, it now formats commands more safely. Also, Cline will no longer auto-run commands by default when you start fresh, which keeps your computer safer.
• Easier tool management: Your settings for external tools (MCP) are now kept in one shared file. If you install a new tool from the marketplace, it shows up immediately without needing to restart the extension.
• Cleaned up history: Your past task history is better preserved when you pause and resume your work, and deleting old tasks works properly now.
• Retired old features: The old "Explain Changes" feature was removed to clean things up. Also, "subagents" (mini AI assistants) are temporarily turned off while the team makes sure they work perfectly with the new engine.

Fixes

• Chat dropouts fixed: Previously, if you sent a message while Cline was busy, your message might get dropped or cause a glitch. This is fixed—messages now wait nicely in line.
• Terminal reliability: A ton of terminal bugs were squashed. Cline now captures output correctly on Windows, handles PowerShell commands better, stops duplicating command echoes, and fixes issues where it would freeze while setting up folders.
• Memory limits: AI models can only read so much text at once. Cline now smartently trims massive outputs (like huge file reads or terminal logs) so it doesn't crash or freeze when reading too much information.
• Login fixes: Fixed an issue where the app might get confused about who was logged in on startup, making the whole login experience smoother.

Breaking changes

• Command auto-approval is now turned off by default for new and reset setups to keep your computer safe. If you relied on Cline automatically running terminal commands without asking, you will now need to manually approve them or change your settings to allow it.