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## Why Ultra reasoning may proactively use multiple agents. When `features.multi_agent_v2.max_concurrent_threads_per_session` is configured at 8 or higher, explicitly selecting Ultra can allow up to `N - 1` subagents to work concurrently and increase usage quickly. Showing the configured limits at selection time makes that tradeoff visible and points users to the setting that controls it. ## What changed - Show a warning history cell after the user explicitly selects Ultra reasoning with a concurrent-thread limit of at least 8. - Include the configured concurrent-thread count and maximum subagent count in the warning. - Apply the warning consistently across model and reasoning pickers, Plan-mode scope selection, and reasoning shortcuts. - Keep the trigger limited to the selected reasoning effort and configured thread limit, independent of how multi-agent v2 is activated. - Add focused threshold coverage and an `insta` snapshot for the rendered warning. ## User impact Users with high multi-agent concurrency receive a concrete warning immediately after selecting Ultra. Other reasoning efforts, limits below 8, and startup behavior are unchanged. https://github.com/user-attachments/assets/5795bcb9-432e-42bc-bde3-ee363e9aeb69 ## Test plan - `just test -p codex-tui ultra_reasoning_selection` - Built the full debug CLI with `cargo build -p codex-cli`. - Manually verified the debug TUI with a 10-thread limit: switching from Max to Ultra displayed the warning with 10 concurrent threads and up to 9 subagents.