Rainbow Week

A Claude Code mod that paints Claude's accent colour — the claude token and the prompt border — in one muted colour per weekday, following rainbow order: red → orange → yellow → green → blue → indigo → violet.

Four palettes, all low-saturation: Morandi (default), Monet, Vermeer, and Song porcelain.

Install

/plugin marketplace add IVLIU/rainbow-week
/plugin install rainbow-week@rainbow-week

Then restart Claude Code (or open /theme and pick "Rainbow Week").

Palettes

Monday → Sunday. Every palette walks the same hue order in its own key.

| | Mon | Tue | Wed | Thu | Fri | Sat | Sun | |---|---|---|---|---|---|---|---| | Morandi (default) | #C2A2A0 dusty rose | #C4A992 clay | #BDB58F wheat | #9FB49B sage | #9DACBD mist blue | #9C97B5 dusty indigo | #B29BB4 grey violet | | Monet | #D9AFAE water-lily | #D8AC96 sunrise | #CFC08D hay | #A5C3A2 iris | #A6BCD6 Giverny blue | #A9A2CF dusk | #C3A5D4 wisteria | | Vermeer | #AE7269 ochre red | #BF9469 ochre | #B9AA6B olive gold | #77A48D celadon | #6889AF Delft blue | #767AA9 blue violet | #977FA0 pearl violet | | Song porcelain | #AF6874 rouge | #B08164 ochre | #B9A156 rattan yellow | #789A86 bamboo | #7199AD sky blue | #666E9C indigo | #967B99 lotus violet |

Shimmer partners (claudeShimmer, promptBorderShimmer) are derived automatically by lifting the main colour 22% toward white.

Commands

• /rainbow — today's colour, active palette, on/off state
• /rainbow palette — list the four palettes, each with a true-colour dot preview
• /rainbow palette morandi|monet|vermeer|song — switch palette, applied immediately
• /rainbow on / /rainbow off — toggle the rotation and restore the previous theme

How it works

Claude Code's theme setting only accepts built-in presets, so a plugin cannot switch a custom theme through config.set. This mod instead:

1. writes ~/.claude/themes/rainbow-week.json — a custom theme whose overrides hold today's colour, inheriting base from whatever preset you had (light stays light);
2. points theme in ~/.claude/settings.json at custom:rainbow-week;
3. re-applies just past local midnight, so a long-running session turns over by itself. The theme directory is watched, so the file rewrite repaints without a restart.

Your previous theme is remembered and restored by /rainbow off.

Notes

• Writes only ~/.claude/themes/rainbow-week.json and the theme key of ~/.claude/settings.json.
• Requires a Claude Code build with custom themes (2.1.118+).
• Colour dots in command output use 24-bit ANSI escapes; terminals without true colour show them as plain white.