Cline is a VS Code extension designed to integrate Large Language Models (LLMs) directly into your development workflow. It allows you to chat with an AI assistant, asking it to perform tasks like writing code, modifying files, or running terminal commands. Key features include support for various LLM providers through a unified ApiHandler, intelligent ContextManager to handle conversation limits, a CheckpointTracker to safely revert changes, and the ability to extend functionality with external tools via the McpHub. The Controller orchestrates interactions between the WebviewProvider (UI) and the core Task processing logic, often using gRPC for structured communication.

Source Repository: https://github.com/cline/cline/tree/main/src

flowchart TD
    A0["ApiHandler
"]
    A1["Controller
"]
    A2["Task
"]
    A3["WebviewProvider
"]
    A4["ContextManager
"]
    A5["CheckpointTracker
"]
    A6["TerminalManager
"]
    A7["McpHub (Model Context Protocol Hub)
"]
    A8["GrpcHandler / ServiceRegistry
"]
    A1 -- "Sends messages to UI" --> A3
    A1 -- "Manages task lifecycle" --> A2
    A2 -- "Calls LLM API" --> A0
    A2 -- "Manages LLM context" --> A4
    A4 -- "Gets model info" --> A0
    A2 -- "Manages workspace snapshots" --> A5
    A2 -- "Executes shell commands" --> A6
    A1 -- "Manages external providers" --> A7
    A2 -- "Uses external tools" --> A7
    A8 -- "Routes UI requests" --> A1

1. WebviewProvider
2. Controller
3. Task
4. ApiHandler
5. CheckpointTracker
6. ContextManager
7. TerminalManager
8. McpHub (Model Context Protocol Hub)
9. GrpcHandler / ServiceRegistry

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