pi can create themes. Ask it to build one for your setup.

Themes

Themes are JSON files that define colors for the TUI.

Table of Contents

• Locations
• Selecting a Theme
• Creating a Custom Theme
• Theme Format
• Color Tokens
• Color Values
• Tips

Locations

Pi loads themes from:

• Built-in: dark, light
• Global: ~/.pi/agent/themes/*.json
• Project: .pi/themes/*.json (only after the project is trusted)
• Packages: themes/ directories or pi.themes entries in package.json
• Settings: themes array with files or directories
• CLI: --theme <path> (repeatable)

Disable discovery with --no-themes.

Selecting a Theme

Select a theme via /settings or in settings.json:

{
  "theme": "my-theme"
}

On first run, pi detects your terminal background and defaults to dark or light.

Initial Theme

Start an interactive run with a theme without changing the saved setting:

pi --use-theme light

To follow terminal appearance, use lightTheme/darkTheme syntax:

pi --use-theme light/dark

The CLI value is the initial theme for that run. Choosing another theme later in /settings applies it immediately and saves it normally.

Creating a Custom Theme

1. Create a theme file:

mkdir -p ~/.pi/agent/themes
vim ~/.pi/agent/themes/my-theme.json

2. Define the theme with all required colors (see Color Tokens):

{
  "$schema": "https://raw.githubusercontent.com/earendil-works/pi/main/packages/coding-agent/src/modes/interactive/theme/theme-schema.json",
  "name": "my-theme",
  "vars": {
    "primary": "#00aaff",
    "secondary": 242
  },
  "colors": {
    "accent": "primary",
    "border": "primary",
    "borderAccent": "#00ffff",
    "borderMuted": "secondary",
    "success": "#00ff00",
    "error": "#ff0000",
    "warning": "#ffff00",
    "muted": "secondary",
    "dim": 240,
    "text": "",
    "thinkingText": "secondary",
    "selectedBg": "#2d2d30",
    "scrollbarThumb": "#555566",
    "searchMatchBg": "#2d2d30",
    "searchMatchText": "",
    "userMessageBg": "#2d2d30",
    "userMessageText": "",
    "customMessageBg": "#2d2d30",
    "customMessageText": "",
    "customMessageLabel": "primary",
    "toolPendingBg": "#1e1e2e",
    "toolSuccessBg": "#1e2e1e",
    "toolErrorBg": "#2e1e1e",
    "toolTitle": "primary",
    "toolOutput": "",
    "mdHeading": "#ffaa00",
    "mdLink": "primary",
    "mdLinkUrl": "secondary",
    "mdCode": "#00ffff",
    "mdCodeBlock": "",
    "mdCodeBlockBorder": "secondary",
    "mdQuote": "secondary",
    "mdQuoteBorder": "secondary",
    "mdHr": "secondary",
    "mdListBullet": "#00ffff",
    "toolDiffAdded": "#00ff00",
    "toolDiffRemoved": "#ff0000",
    "toolDiffContext": "secondary",
    "syntaxComment": "secondary",
    "syntaxKeyword": "primary",
    "syntaxFunction": "#00aaff",
    "syntaxVariable": "#ffaa00",
    "syntaxString": "#00ff00",
    "syntaxNumber": "#ff00ff",
    "syntaxType": "#00aaff",
    "syntaxOperator": "primary",
    "syntaxPunctuation": "secondary",
    "thinkingOff": "secondary",
    "thinkingMinimal": "primary",
    "thinkingLow": "#00aaff",
    "thinkingMedium": "#00ffff",
    "thinkingHigh": "#ff00ff",
    "thinkingXhigh": "#ff0000",
    "thinkingMax": "#ff0088",
    "bashMode": "#ffaa00"
  }
}

3. Select the theme via /settings.

Hot reload: When you edit the currently active custom theme file, pi reloads it automatically for immediate visual feedback.

Theme Format

{
  "$schema": "https://raw.githubusercontent.com/earendil-works/pi/main/packages/coding-agent/src/modes/interactive/theme/theme-schema.json",
  "name": "my-theme",
  "vars": {
    "blue": "#0066cc",
    "gray": 242
  },
  "colors": {
    "accent": "blue",
    "muted": "gray",
    "text": "",
    ...
  }
}

• name is required, must be unique, and must not contain /.
• vars is optional. Define reusable colors here, then reference them in colors.
• colors must define all 51 required tokens. thinkingMax, scrollbarThumb, and the two search highlight tokens are optional and use the fallbacks listed below.

The $schema field enables editor auto-completion and validation.

Color Tokens

Every theme must define all 51 required color tokens. The optional tokens preserve compatibility with existing themes: thinkingMax falls back to thinkingXhigh, scrollbarThumb and searchMatchBg fall back to selectedBg, and searchMatchText falls back to text. Other search matches use searchMatchText on searchMatchBg with an underline; the current match reverses that foreground/background pair and uses bold text.

Core UI (11 colors)

Backgrounds & Content (11 required, 3 optional)

Markdown (10 colors)

Tool Diffs (3 colors)

Syntax Highlighting (9 colors)

Thinking Level Borders (6 required, 1 optional)

Editor border colors indicating thinking level (visual hierarchy from subtle to prominent):

Bash Mode (1 color)

HTML Export (optional)

The export section controls colors for /export HTML output. If omitted, colors are derived from userMessageBg.

{
  "export": {
    "pageBg": "#18181e",
    "cardBg": "#1e1e24",
    "infoBg": "#3c3728"
  }
}

Color Values

Four formats are supported:

256-Color Palette

• 0-15: Basic ANSI colors (terminal-dependent)
• 16-231: 6×6×6 RGB cube (16 + 36×R + 6×G + B where R,G,B are 0-5)
• 232-255: Grayscale ramp

Terminal Compatibility

Pi uses 24-bit RGB colors. Most modern terminals support this (iTerm2, Kitty, WezTerm, Windows Terminal, VS Code). For older terminals with only 256-color support, pi falls back to the nearest approximation.

Check truecolor support:

echo $COLORTERM  # Should output "truecolor" or "24bit"

Tips

Dark terminals: Use bright, saturated colors with higher contrast.

Light terminals: Use darker, muted colors with lower contrast.

Color harmony: Start with a base palette (Nord, Gruvbox, Tokyo Night), define it in vars, and reference consistently.

Testing: Check your theme with different message types, tool states, markdown content, and long wrapped text.

VS Code: Set terminal.integrated.minimumContrastRatio to 1 for accurate colors.

Examples

See the built-in themes:

• dark.json
• light.json