kit-cor

kit-cor is a skill for Claude Code, Codex from harebeats/cannonball. It costs 193 tokens per session (2,977 once invoked), scanned A, original, MIT.

A Portuguese-language skill for choosing a website color palette based on a brand’s promise, industry expectations, attention priorities, and unwanted associations.

In plain words
What is it for?
Use it to define background, text, surface, and accent colors, assess design-system bias, and measure or improve color contrast.
Why use it?
It replaces arbitrary color selection with decisions about the role of each color and checks whether the resulting palette fits the brand and remains readable.

Skill for Claude CodeCodex

Part of the cannonball plugin — 9 skills shipped together

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/harebeats/cannonball/kit-cor
Any agent
npx skills add harebeats/cannonball --skill kit-cor
Clone the repo
git clone --depth 1 https://github.com/harebeats/cannonball

Made for: Claude Code, Codex.

Or install cannonball, the plugin that ships this one along with the rest of its 9 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 kit-cor

README.md
[![agentmods](https://agentmods.dev/badge/skills/harebeats/cannonball/kit-cor.svg)](https://agentmods.dev/skills/harebeats/cannonball/kit-cor)
Your own site
<a href="https://agentmods.dev/skills/harebeats/cannonball/kit-cor"><img src="https://agentmods.dev/badge/skills/harebeats/cannonball/kit-cor.svg" alt="Measured on agentmods" height="20"></a>
Per session 193 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,977 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 $0.00193 $0.02977
Opus 5 $0.00097 $0.01489
Sonnet 5 $0.00039 $0.00595
Haiku 4.5 $0.00019 $0.00298

Measured 4d ago against content hash cf4da05b6567, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

kit-cor 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 4d ago.

The scan reads SKILL.md. This mod also ships 26 executable files (scripts/armadilhas.py, scripts/assets.py, scripts/buscar.py, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

skills/kit-cor/SKILL.md · 264 lines

How it starts

The opening of the file, as written. The whole thing — 264 lines — stays where its author put it; the contents beside it link to each section on GitHub.

kit-cor — decidir a cor, em vez de herdar

Antes de qualquer comando: resolva o SKILL_DIR

Todo comando abaixo roda um script que viaja junto desta skill, em SKILL_DIR/scripts/. Defina SKILL_DIR como o caminho absoluto da pasta que contém ESTE SKILL.md que você acabou de ler — o seu harness informou esse caminho no resultado da leitura. Funciona em qualquer hospedeiro, sem depender de variável de ambiente de nenhum agente específico:

~/.claude/plugins/cache/cannonball/cannonball/<v>/skills/<nome>/SKILL.md
~/.codex/skills/<nome>/SKILL.md
~/.gemini/skills/<nome>/SKILL.md
~/.agents/skills/<nome>/SKILL.md

Em todos, SKILL_DIR é a pasta do SKILL.md, e SKILL_DIR/scripts/ está ao lado.

Um design system guarda as cores como lista plana: nenhuma diz qual é fundo, qual é tinta, qual é acento. Lista plana não se decide, só se copia — e copiar é exatamente a sensação de automático.

Pior: todo acervo de design system tem viés, e o viés é mensurável. Meça o seu antes de recomendar qualquer coisa:

python "${SKILL_DIR}/scripts/cor.py" --vies

Ele conta, dos design systems que você guardou, quantos têm acento neutro, azul, amarelo, quente, e quantos são tema claro. O padrão que aparece em quase todo acervo é o mesmo: cerca de metade cai em neutro ou azul, e a maioria é tema claro. Não porque o acervo é ruim — porque ele foi extraído de sites reais, e o mercado inteiro é assim.

A consequência prática: puxar design system por busca sem ter falado de cor devolve, na média, exatamente o lugar-comum que o --vies acabou de medir.

Esta skill existe para que a cor seja escolhida antes do design system, e o design system sirva à cor — não o contrário.


0. A cor faz cinco trabalhos diferentes — decida qual

Antes de escolher matiz, decida para que a cor serve nesta peça. São cinco usos, e eles pedem paletas diferentes (detalhe em ${SKILL_DIR}/references/fundamentos-visuais.md §5):

Uso O que a cor está fazendo
atenção hierarquia, ritmo (acento repetido com matiz mudando), agrupamento por proximidade, ponto de entrada
percepção profundidade (quente avança, frio recua), peso visual, valor
branding conformidade ou fuga da categoria, e recall de memória
função verde aprovado, amarelo atenção, vermelho descartar — lido antes do ícone
emoção o que a pessoa sente antes de interpretar qualquer outra coisa

Read the full file on GitHub · 264 lines

Files

What ships with it

51 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. 4d ago First seen · 264 lines · 193 tokens per session scan A cf4da05b6567

Subscribe to this mod's changes

kit-cor is a skill published in the GitHub repository harebeats/cannonball (2 stars, last pushed 7d ago), licensed MIT. It adds 193 tokens to every session and 2,977 once invoked, about $0.0010 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 2026-08-31.

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