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codex/codex-rs/tui
Felipe CouryandGitHub c6bcd27832 feat(tui): suggest plan mode from composer drafts (#19901)
## Summary

- suggest Plan mode when the current composer draft contains the
standalone word `plan`
- shares the Codex App heuristics for detection
- excludes things line `/plan` and the word plan in shell mode
- reuse the existing `Shift+Tab` mode cycle and add thread-scoped
dismissal with `Esc`
- replace the normal footer hint while the reminder is visible so the
statusline stays anchored


https://github.com/user-attachments/assets/01123ae8-cee6-4e95-b563-44655c071cde

## Why

The desktop app already nudges users toward Plan mode when their draft
clearly signals planning intent. The TUI had the underlying `/plan` and
`Shift+Tab` flows, but no equivalent reminder at the moment the user was
most likely to benefit from them.

## Details

The reminder is shown only when Plan mode is available, the draft
contains standalone `plan`, the user is not already in Plan mode, the
composer is actionable, and the current thread has not dismissed the
reminder. Slash-command and shell-command drafts are excluded.

The first implementation used an extra composer row, but that moved the
statusline whenever the heuristic fired. This version keeps the layout
stable by rendering the reminder in the existing footer row instead.

## Validation

- `INSTA_UPDATE=always cargo test -p codex-tui
chatwidget::tests::plan_mode::plan_mode_nudge -- --nocapture`
- `just fmt`
- `just fix -p codex-tui`
- `./tools/argument-comment-lint/run.py -p codex-tui`
- `cargo insta pending-snapshots`
- `git diff --check`
2026-04-28 14:34:10 -03:00
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