Spawn a persistent teammate when you want a named worker you can task or message repeatedly.
- Use `team_spawn` for a persistent named worker, not for one-off bounded work.
- Pass `driver` to force `claude-sdk`, `claude-cli`, or `codex-cli` for this teammate instead of using the extension default.
- Call `runtime_models` first when you need the supported model ids for a driver.
- Keep the teammate bootstrap prompt compact; give detailed work through later `team_task` or `team_message` calls.