Cline and Roo are open-source VS Code extensions that let a model, including Claude, act as an agent inside your editor: reading files, running commands, and proposing edits. Claude Code is Anthropic's own terminal-first agent, built specifically around Claude's tool-use behaviour. For an Australian engineering team choosing between them, the real question isn't which is more capable in isolation, it's which fits how your team already works.
Where the extensions genuinely differ
Cline and Roo run inside the IDE window, showing proposed diffs inline and requiring a click to approve each change, which suits developers who want to stay visually anchored to the file tree and never leave VS Code. Claude Code runs in the terminal, which suits developers comfortable with a command-line workflow and who want to drive multiple parallel sessions, pipe output into scripts, or run it headless in CI. Neither approach is objectively better, they optimise for different working styles.
Cline: IDE-native, inline diff review, strong community plugin ecosystem, model-agnostic
Roo: a Cline fork with additional modes (architect, debug, ask) and more configurable permission boundaries
Claude Code: terminal-first, scriptable, built-in support for hooks, subagents and CI integration
The model-agnostic trade-off
Both Cline and Roo can run with any capable model behind an API key, Claude, GPT, or an open-weight model, which is genuinely useful if your team wants to compare models on the same task without switching tools. Claude Code is Claude-specific, but that specificity buys tighter integration: permission modes, subagents, and hooks are built around how Claude actually calls tools, rather than a generic tool-calling layer that has to work across many providers. Teams that have already standardised on Claude tend to get more from the tighter integration than they lose from the lack of model choice.
What a Melbourne engineering team actually found
A 14-person Melbourne fintech engineering team trialled all three for a month across two squads. The squad doing mostly greenfield feature work preferred Roo's architect mode for planning before touching code. The squad doing CI-heavy maintenance work, running the same agent against a queue of dependency-upgrade tickets overnight, found Claude Code's headless mode saved roughly 6 hours a week of manual triage, worth close to $900 at a senior engineer's loaded rate. They kept both running rather than standardising on one, which is a reasonable outcome for a team split across genuinely different workflows.
A practical way to decide
If your team lives in VS Code and wants to compare models: start with Cline or Roo
If your team wants scriptable, CI-friendly, or high-volume overnight agent runs: start with Claude Code
If security review matters more than speed: Roo's granular permission modes are worth the extra setup
If you're already paying for Claude and want the tightest tool-use behaviour: Claude Code first
Cost differences worth knowing upfront
None of the three tools charge a separate licence fee, the cost is entirely in model API usage, which means the real comparison is about how efficiently each tool uses tokens for a given task, not a subscription line item. Claude Code's prompt caching and context management tend to keep long sessions cheaper than a naive agent loop, which matters more once a team is running dozens of sessions a day rather than one developer experimenting after hours. Teams running high-volume overnight batches, dependency upgrades, test generation, migration scripts, typically see the cost difference show up clearly in a monthly API bill within the first few weeks.
Setup friction is also worth weighing. Cline and Roo install as a VS Code extension in a couple of minutes with no separate terminal setup, which suits a team wanting the lowest-friction trial. Claude Code needs a terminal environment set up correctly, not hard, but a genuine extra step for developers unfamiliar with CLI tools. Neither friction level should be the deciding factor on its own, but it's a fair thing to budget half a day for either way before the real evaluation starts.
One more practical wrinkle worth flagging for Australian teams specifically: whichever tool you choose, check where the model calls actually route and whether that matters for your compliance posture. A financial services team under APRA scrutiny cares about this differently to a five-person marketing shop, and the extension layer itself doesn't change Claude's underlying data handling, but it's worth confirming rather than assuming when the choice is being made by a security-conscious buyer rather than an individual developer picking a tool for personal use.
None of these are locked-in choices. The extensions and Claude Code can run side by side on the same repository without conflict, so the lowest-risk approach for most Australian teams is a genuine two-week trial with real tickets, not a synthetic benchmark, before committing budget and workflow habits to one.
