theme

A command that changes the colors and design tokens of an AstroDeck website theme.

In plain words
What is it for?
Use it to customize light and dark mode colors for backgrounds, text, buttons, muted areas, accents, cards, borders, inputs, and focus rings.
Why use it?
It lets you adjust the site's visual system in one place instead of changing colors across individual pages and components.

Command for Claude Code

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add commands/holger1411/astrodeck/theme
Clone the repo
git clone --depth 1 https://github.com/holger1411/astrodeck

Made for: Claude Code.

Per session 9 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 801 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00009 $0.00801
Opus 5 $0.00005 $0.00400
Sonnet 5 $0.00002 $0.00160
Haiku 4.5 $0.00001 $0.00080

Measured 2d ago against content hash 3d70183299ca, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

theme scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.claude/commands/theme.md · 101 lines

How it starts

The opening of the file, as written. The whole thing — 101 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Customize Theme

Modify the design system in src/styles/globals.css using Tailwind CSS v4's @theme directive and OKLCH color format.

Color request from the user (ask if empty): $ARGUMENTS

Current Theme Location

All design tokens are in src/styles/globals.css under:

  • @theme { ... } - Light mode colors (Tailwind v4 token registration)
  • .dark { ... } - Dark mode color overrides

Available Tokens

/* Core */
--color-background      /* Page background */
--color-foreground      /* Primary text */

/* Primary (buttons, links, CTAs) */
--color-primary
--color-primary-foreground

/* Secondary */
--color-secondary
--color-secondary-foreground

/* Muted (subtle backgrounds, secondary text) */
--color-muted
--color-muted-foreground

/* Accent (highlights) */
--color-accent
--color-accent-foreground

/* Cards & Borders */
--color-card
--color-card-foreground
--color-border
--color-input
--color-ring

How to Customize

  1. Read current values from src/styles/globals.css
  2. Use the user's color request from the arguments above; only ask if no colors were given (hex, HSL, OKLCH, or color name accepted)
  3. Convert to OKLCH format: oklch(lightness% chroma hue)
  4. Update both @theme and .dark sections
  5. Check contrast - foreground must be readable on background

OKLCH Color Format

oklch(lightness% chroma hue)
  • Lightness: 0-100% (0 = black, 100 = white)
  • Chroma: Color intensity (0 = grayscale, 0.1-0.4 = vivid)
  • Hue: Color angle in degrees (0-360)

Common hues: Red ~25, Orange ~70, Yellow ~100, Green ~145, Blue ~250, Purple ~300

Example Transformation

User wants: "Make primary color forest green"

/* Before (in @theme block) */
--color-primary: oklch(11.2% 0.0079 286.75);

/* After */
--color-primary: oklch(45% 0.15 145);  /* Forest green */

Important Rules

  • Always use OKLCH format - oklch(L% C H) (NOT HSL, NOT hex)
  • Use --color- prefix for all tokens (Tailwind v4 convention)
  • Update both themes - @theme block and .dark block
  • Test contrast - primary-foreground must be readable on primary (4.5:1 minimum)
  • Never create a tailwind.config.mjs - Tailwind v4 uses CSS-based config only

Read the full file on GitHub · 101 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2d ago First seen · 101 lines · 0 tokens per session scan A 3d70183299ca

Subscribe to this mod's changes

theme is a command published in the GitHub repository holger1411/astrodeck (72 stars, last pushed 25d ago), licensed MIT. It adds 9 tokens to every session and 801 once invoked, about $0.0000 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.