About
Cline is an open-source, autonomous AI coding agent built for developers who want full transparency and control over their AI-assisted development workflow. With over 5 million installs and 59,000 GitHub stars, Cline has earned deep trust across the developer community and is used by engineering teams at leading companies worldwide. Cline integrates natively into Visual Studio Code (the world's most popular code editor), JetBrains IDEs (IntelliJ IDEA, PyCharm, WebStorm, and more), and offers a powerful CLI for terminal-first developers. This multi-platform approach means developers can work the way they prefer without sacrificing AI capabilities. Key capabilities include Plan/Act modes that let developers think through changes before executing them, MCP (Model Context Protocol) integration for extending agent behavior with external tools, and terminal-first automation that enables Cline to run inside scripts, cron jobs, and CI/CD pipelines. Cline can explore and explain unfamiliar codebases, perform coordinated refactors across large projects while keeping imports and types consistent, and autonomously complete repetitive engineering tasks. Being fully open-source means Cline is extensible and auditable — ideal for security-conscious teams and enterprises. An enterprise tier is available for organizations needing collaboration features and support. Whether you're an individual developer or part of a large engineering team, Cline acts as a collaborative AI partner that amplifies developer impact.
Key Features
- Plan/Act Modes: Separate planning and execution phases let developers review and approve Cline's intended changes before any code is written or modified.
- Multi-IDE & CLI Support: Works natively inside VS Code, JetBrains IDEs, and as a standalone CLI tool, giving developers full flexibility over their preferred environment.
- MCP (Model Context Protocol) Integration: Extend Cline's capabilities with external tools and APIs through an open MCP marketplace, enabling custom agent behaviors and data sources.
- Large-Scale Codebase Refactoring: Performs coordinated changes across entire codebases while automatically maintaining consistent imports, types, and runtime behavior.
- CI/CD & Script Automation: Use Cline CLI inside scripts, cron jobs, and CI pipelines to automate recurring checks, code updates, and custom engineering workflows.
Use Cases
- Exploring and understanding an unfamiliar codebase by asking Cline about file structure, dependencies, and component behavior
- Performing large-scale refactors across a monorepo while ensuring imports, type signatures, and runtime behavior remain consistent
- Automating repetitive CI/CD tasks such as dependency updates, linting fixes, and code generation via the Cline CLI
- Accelerating onboarding for new engineering team members by letting Cline answer codebase questions interactively in VS Code or JetBrains
- Extending agent capabilities for specialized workflows by connecting custom tools and APIs through the MCP marketplace
Pros
- Fully Open Source & Auditable: The entire codebase is public on GitHub with 59k+ stars, making it transparent, forkable, and suitable for security-conscious teams and regulated industries.
- Wide Platform Coverage: Supports VS Code, JetBrains, and CLI — covering the vast majority of developer environments without requiring workflow changes.
- Massive Community & Ecosystem: With 5M+ installs and an active Discord, Reddit, and GitHub Discussions community, support and extensions are readily available.
- Powerful Automation Capabilities: The CLI integration enables Cline to be embedded into CI/CD pipelines and automation scripts, far beyond typical IDE assistant functionality.
Cons
- Requires LLM API Keys: Cline itself is free, but users must supply their own API keys (e.g., Anthropic Claude, OpenAI) which can result in significant usage costs for heavy workloads.
- Autonomous Agent Risk: As an agentic tool that can read, write, and execute code, mistakes in complex tasks may have wide-reaching effects if not carefully reviewed in Plan mode.
- Enterprise Features Are Paid: Advanced collaboration and organizational features are locked behind an enterprise tier, which may be a barrier for smaller teams needing those capabilities.
Frequently Asked Questions
Is Cline AI really free to use?
Yes, Cline itself is fully free and open-source. However, you need to provide your own LLM API key (such as Anthropic Claude or OpenAI), and the cost of API usage is determined by the model provider. An enterprise plan is also available for teams needing additional features.
Which editors and IDEs does Cline support?
Cline supports Visual Studio Code, JetBrains IDEs (including IntelliJ IDEA, PyCharm, and WebStorm), and provides a standalone CLI for terminal-first workflows and automation pipelines.
What is Plan/Act mode in Cline?
Plan mode lets you discuss and review what Cline intends to do before it takes any action, while Act mode executes the changes. This two-phase approach gives developers visibility and control over autonomous code modifications.
What is MCP integration and why does it matter?
MCP (Model Context Protocol) is an open standard that allows Cline to connect with external tools, APIs, and data sources. This makes Cline highly extensible — you can add custom capabilities through the MCP marketplace without modifying core functionality.
Can Cline be used in CI/CD pipelines?
Yes. The Cline CLI can be embedded in scripts, cron jobs, and CI/CD pipelines, allowing you to automate recurring code checks, updates, and custom engineering workflows beyond interactive IDE usage.
