Roo Code

Roo Code is an open-source VS Code coding agent with specialized modes for coding, architecture, debugging, and custom workflows.

Overview

Roo Code grew out of the open-source Cline agent and adds a mode system that adapts the assistant’s behavior to the job at hand. Switch between Code mode for implementation, Architect mode for design documents, Ask mode for explanations, and Debug mode for systematic fault-finding, or define your own custom modes with tailored prompts and tool permissions. Like its sibling projects, it edits files with reviewable diffs and requires your approval before running terminal commands.

The mode system is Roo Code’s distinguishing idea: rather than a single assistant persona, it offers specialized roles that change the system prompt and available tools. Architects produce designs and trade-off discussions, while Debug mode walks a failing test toward a root cause with deliberate reasoning steps.

Teams with bespoke workflows appreciate that custom modes can encode internal standards such as documentation style, security checklists, or commit conventions, effectively turning tribal knowledge into a repeatable agent behavior.

Because Roo Code is free and open source, teams can experiment widely before standardizing, and community modes circulate freely for common jobs like test writing and documentation.

Key Features

• Mode system (Code, Architect, Ask, Debug, custom) for task-specific agent behavior
• Browser automation to verify web UI changes the agent makes
• MCP support and an MCP marketplace for extending the agent with external tools
• Multi-model support across major cloud providers and local models
• Checkpoints, diffs, and per-action approval for safe autonomous work
• Boomerang Tasks that delegate subtasks to focused agent runs

Pricing

Roo Code is free and open source. You connect your own model provider and pay for API usage directly, which keeps costs transparent and lets you mix premium and local models per task.

Who Is It For

Developers who want an agent that can shift roles during a project, from designing a feature to implementing and debugging it. Custom modes make it attractive to teams with distinctive review or documentation workflows.

FAQ

Is Roo Code free to use?

Yes, the extension is free and open source; only the model API usage you choose is billed by your provider.

Does Roo Code offer an API?

Roo Code is a VS Code extension and also ships a CLI/SDK variant for automation, with MCP support for tool integration.

How does Roo Code compare to alternatives?

Compared with Cline, Roo Code adds deeper mode customization; compared with commercial AI IDEs, it is free, open source, and provider-agnostic.