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theme-custom

theme-custom is a skill for Claude Code, Codex from livlign/ccthemes. It costs 56 tokens per session (876 once invoked), scanned B, original, MIT.

An interactive tool for creating a Claude Code color theme as a JSON file, with a chosen light or dark base and selected color changes.

In plain words
What is it for?
Use it to create, adjust, save, and activate custom Claude Code themes, including themes based on an existing shipped theme.
Why use it?
It helps developers design and activate a personal theme without manually working out the theme file format.

Skill for Claude CodeCodex

Part of the theme-gallery plugin — 2 skills shipped together

not rated 2 1mo ago B scan 56 tokens original MIT
View the source file livlign/ccthemes
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 skills/livlign/ccthemes/theme-custom
Any agent
npx skills add livlign/ccthemes --skill theme-custom
Clone the repo
git clone --depth 1 https://github.com/livlign/ccthemes

Made for: Claude Code, Codex.

Or install theme-gallery, the plugin that ships this one along with the rest of its 2 skills.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for theme-custom

README.md
[![agentmods](https://agentmods.dev/badge/skills/livlign/ccthemes/theme-custom.svg)](https://agentmods.dev/skills/livlign/ccthemes/theme-custom)
Your own site
<a href="https://agentmods.dev/skills/livlign/ccthemes/theme-custom"><img src="https://agentmods.dev/badge/skills/livlign/ccthemes/theme-custom.svg" alt="Measured on agentmods" height="20"></a>
Per session 56 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 876 The whole file, excluding the scripts and references it only reads on demand.
Security scan B 1 finding. 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 $0.00056 $0.00876
Opus 5 $0.00028 $0.00438
Sonnet 5 $0.00011 $0.00175
Haiku 4.5 $0.00006 $0.00088

Measured 5d ago against content hash a0c8c1f663bf, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade B, and why

theme-custom scanned grade B with 1 finding 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 5d 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.

Reads agent configuration directoriesmediumAgent snooping

.claude/, .codex/, .gemini/ hold keys, settings and other credentials a mod has no legitimate need for.

`~/.claude/settings.json` (create `{}` if absent), set `"theme": "custom:<slug>"`,
plugins/theme-gallery/skills/theme-custom/SKILL.md · 57 lines

How it starts

The opening of the file, as written. The whole thing — 57 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Build a custom Claude Code theme

Guide the user to a finished, activated custom theme. A theme is a JSON file at ~/.claude/themes/<slug>.json with three fields: name, base, and overrides. Claude Code hot-reloads the folder, so a written file applies without restart (if ~/.claude/themes/ did not exist before this session, the user restarts once).

Steps

  1. Establish the direction. Ask two quick questions if the user hasn't already said:

    • Light or dark? → sets base (dark is the default; light, dark-daltonized, light-daltonized, dark-ansi, light-ansi are the other options).
    • A hero/accent color or a vibe (e.g. "warm terracotta", "cool neon", "muted forest"). Offer to start from an existing shipped theme as a base to tweak — read one from the plugin's themes/ directory and adjust it.

  2. Generate the overrides. Only set tokens you have a deliberate reason to change; everything else inherits from base. Colors accept #rrggbb, #rgb, rgb(r,g,b), ansi256(n), or ansi:<name>. The tokens that matter most, in priority order:

    Token Controls
    claude Primary accent — spinner, assistant label. Set claudeShimmer to a lighter tint of it.
    text Default foreground text
    inactive / subtle Hints, timestamps; faint borders
    success / error / warning Pass / fail / caution
    diffAdded / diffRemoved Backgrounds of added/removed lines — use dark, desaturated tints on dark bases and pale tints on light bases, NOT vivid foreground green/red
    diffAddedWord / diffRemovedWord Word-level highlight, a shade stronger than the line
    diffAddedDimmed / diffRemovedDimmed Faint context tint near a change
    planMode / autoAccept / bashBorder / promptBorder Mode accents and input borders

    Rule of thumb for diff backgrounds: composite the theme's green/red over its background at low alpha (~18–22% on dark, ~16% on light). Never reuse a vivid terminal foreground green as a background — it destroys the text contrast.

Read the full file on GitHub · 57 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. 5d ago First seen · 57 lines · 56 tokens per session scan B a0c8c1f663bf

Subscribe to this mod's changes

theme-custom is a skill published in the GitHub repository livlign/ccthemes (2 stars, last pushed 1mo ago), licensed MIT. It adds 56 tokens to every session and 876 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it B with 1 finding (reads agent configuration directories). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Design and UXcatppuccinclaude-codeclaude-code-plugincolor-schemedark-themedracula
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