Cline and Roo Code on the same API key

Using your own API key with Cline or Roo Code separates two decisions: which coding agent you prefer, and which service supplies its models. Both can work with an OpenAI-compatible provider, making it possible to compare their workflows without changing your billing account. The useful differences are in planning, permissions, and how much context each task sends.

Vana API provides one endpoint at https://api.vanaapi.com, with OpenAI-compatible access alongside Anthropic Messages and Gemini native protocols. For this comparison, the OpenAI-compatible route is the common starting point. Protocol support alone does not make every client feature interchangeable; the selected provider adapter still matters.

§ Connecting the same account

Cline: Select its OpenAI-compatible provider option, then enter your API key, the provider's documented base URL, and an exact supported model identifier. Setting names can change between releases, so check the installed extension rather than following an old screenshot.

Roo Code: Use the equivalent OpenAI-compatible configuration. Roo Code's configuration profiles can be useful when keeping different model or provider settings for different tasks. Start with one profile before introducing more combinations.

In either client, follow Vana API's current instructions for the complete base URL, including any required path suffix. Copy the model identifier from the provider's listing rather than deriving it from a display name. Confirm the connection with a small, read-only request before allowing file edits or terminal commands.

§ Planning and carrying out changes

Cline: Its Plan and Act workflow offers a clear boundary between discussing an approach and carrying it out. This suits sessions where you want to inspect the proposed scope before the agent starts modifying a repository.

Roo Code: Its mode-oriented workflow gives more room to separate activities such as architecture, coding, and debugging. Custom modes can help establish repeatable instructions and tool boundaries, although maintaining them introduces configuration work.

Neither arrangement guarantees a better patch. Compare them on the same bounded task: explain a failing test, propose a fix, then make the smallest justified change. Review the diff and test results, not just the confidence of the final response.

§ Permissions and repository safety

Cline: Begin with explicit approval for consequential actions. Read command requests carefully, especially when they install dependencies, access the network, or operate outside the intended workspace.

Roo Code: Apply the same restraint to mode permissions and automatic approvals. A narrowly named mode is not a substitute for checking which tools and actions it can actually use.

For both, use a clean working tree or a dedicated branch. Checkpoints, where available and configured, can help recovery, but they do not replace version control or reverse every external side effect. Keep credentials out of repository files and review the extension's credential-storage behavior.

§ Model choice and the actual bill

Cline: Planning exchanges, file reads, tool results, and retries can all contribute to token usage. A long session may cost more than its visible code changes suggest.

Roo Code: Switching modes or delegating work can make a complex task easier to organize, but extra agent exchanges can also add usage. More structure is useful only when it reduces mistakes or unnecessary work.

Vana API bills per real token with no monthly fee. A model such as Claude Sonnet 5.5 is one option to evaluate, provided the chosen adapter supports the capabilities your workflow needs. Use the same model, repository state, and task instructions for a fair comparison. Record total cost, elapsed time, manual corrections, and whether the tests pass.

§ Choosing the workflow to keep

Choose Cline if a direct planning-to-action loop feels easier to supervise. Choose Roo Code if distinct modes and reusable configurations match the way you divide development work. These are workflow preferences, not universal rankings.

Using your own key does not make either client local-only: repository content included in requests travels to the configured service. Check data-handling requirements before connecting a private codebase. To try this setup, create a Vana API account, keep approvals conservative, and run one small task in each client before committing to a larger session.