Status correction: DeepSeek’s API quickstart calls Harness a developer preview. Earlier wording on this site calling it generally available, quoting a universal task cost or treating an rc.8 feature list as current has been withdrawn.
What the source establishes
The official quickstart links a Harness guide for agent developers worldwide. That establishes a documented entry point; it does not establish a completed installation, a particular release’s permissions, a price per task or a MonkeyCode integration test on this site.
Evaluate the runtime separately from the model
Choose an exact released version and save its installation instructions. In an isolated example directory, verify how the runtime reads files, proposes edits, runs checks, handles a denied action and stops a task. Keep the resulting diff and logs. A model’s API compatibility does not determine the runtime’s filesystem or network permissions.
Use a small acceptance task
The first-task pack provides fixed inputs and checks. Try it without private code, retain failed attempts and record any setup work. Before adding a plugin or another agent, repeat the same checks with its new permissions. Compare the evidence against the current workflow comparisons, not old claims about which product is only an editor or terminal.