Cline

Cline is an open-source coding agent for VS Code, JetBrains, and the terminal. It is built for developers who want an agent that can actually work inside a repository: inspect files, propose edits, create new files, run shell commands, open a browser for UI checks, and connect to external systems through MCP. The key distinction is control. Cline can do multi-step work, but file changes and terminal commands stay visible to the developer instead of happening as a hidden background process.

Top features

• Editor-native agent: Cline runs where the code is, with project context, diffs, approvals, and command output visible in the development flow.
• Human-approved actions: file edits, shell commands, browser steps, and tool calls can be reviewed before they affect the repo or machine.
• MCP marketplace and tool use: teams can wire Cline into docs, databases, APIs, issue trackers, and internal services through Model Context Protocol servers.
• Browser-assisted debugging: useful for web apps where the agent needs to inspect a page, reproduce a UI problem, or verify behavior after a change.
• Model flexibility: Cline is not limited to one backend, which matters for teams comparing Claude, OpenAI, Gemini, local models, or routed provider setups.

Use cases

• Investigate a bug from logs or a stack trace, trace it through the repository, and propose a bounded patch.
• Add tests around an existing module, run the suite, and iterate on failures while keeping each command visible.
• Refactor a feature across several files without losing the developer’s review loop.
• Connect repo work to private docs, ticket context, or internal APIs through MCP.
• Use an agent in a stricter environment where uncontrolled shell access is not acceptable.