Theme

Parent: Interactive TUI.

Rho can match the host terminal or use a named color theme. Open the picker with /theme, or from /config → Models & reasoning → Theme.

Default: terminal

The default theme is terminal. Rho samples the host background and standard ANSI color slots at startup (when the host supports that query) and maps them into UI roles:

Role	Typical use
Default text	Body copy and ordinary labels
Dim	Muted chrome, secondary labels, separators
Accent	Brand marks, input prompt, focus highlights
Success / warning / error	Status, confirmations, and failures
Soft panels	User message and neutral tool backgrounds

Soft panels blend a little of the palette into the background so blocks sit on the same surface as the rest of the TUI.

Built-in themes

These ship with Rho and work offline:

Id	Name
terminal	Match the host terminal (default)
one-half-dark	One Half Dark
one-half-light	One Half Light
monochrome-dark	Monochrome Dark
monochrome-light	Monochrome Light

Named themes paint Rho's own surface and RGB accents so light and dark schemes stay readable even when the host terminal uses the opposite mode.

Custom themes

Drop Windows Terminal color-scheme JSON files into:

~/.rho/themes/

or $RHO_HOME/themes/ when RHO_HOME is set. The file stem is the theme id (dracula.json → dracula). Each file should include background, foreground, the eight normal colors (black … white), the eight bright colors (brightBlack … brightWhite), and may include name, cursorColor, and selectionBackground.

That shape matches common catalogs such as iTerm2-Color-Schemes (windowsterminal/*.json) and windowsterminalthemes.dev.

Built-in ids are reserved. A custom file named one-half-dark.json is ignored so it cannot hide the built-in scheme.

Picker and preview

The theme picker lists terminal, built-in, and custom schemes together, sorted by name. Moving the selection previews colors live on the whole UI. Enter saves the choice to config and keeps it. Escape restores the previous theme.

Config

[display]
theme = "terminal" # or one-half-dark, monochrome-light, a custom file stem, ...

Changes from /theme or /config apply immediately and persist in config.toml.

When sampling is unavailable

Some hosts cannot report exact RGB values. With theme = "terminal", Rho falls back to standard ANSI colors and terminal defaults. The match is coarser than a full palette sample. Named themes do not need host sampling.

Related

• Transcript display - scroll, copy, and Markdown
• Configuration - display group settings
• Interactive TUI - shortcuts and commands