Chart Color System
Solve, audit and simulate colorblind-safe chart palettes. WCAG contrast, OKLab ΔE. Read-only.
使うべきか
品質と安全性
ツール定義とプロトコルへの準拠に関する自動分析に基づいています。
コンテキストコスト
これは、サーバーのツールがモデルのコンテキストに読み込まれるたびに消費されるおおよそのトークン数です。数が多いほど、ほかのタスクに使える注意が減ります。
インストール
ワンクリックインストール
これを `claude_desktop_config.json` ファイルに追加してください:
{
"mcpServers": {
"chart-color-system": {
"url": "https://chart-color-mcp.vercel.app/mcp"
}
}
}リモートエンドポイント
https://chart-color-mcp.vercel.app/mcpstreamable-httpできること
ツール一覧
ツール（4）
🟢solve_palette(n, anchors, background, grid, posture)
Generate a categorical chart palette of n colors (1-12) that maximizes perceptual separation under normal vision and colorblindness, with the given brand colors locked as anchors in slot order. Returns the palette, the worst pair distances, the engine's relaxation notes, a full accessibility audit against the background, and a link to open it in the app. Honest cap is 6 slots; above that the result says so.
入力スキーマ
{
"type": "object",
"properties": {
"n": {
"type": "integer",
"minimum": 1,
"maximum": 12,
"default": 6,
"description": "Number of categorical slots"
},
"anchors": {
"type": "array",
"items": {
"type": "string"
},
"maxItems": 12,
"default": [],
"description": "Brand or required colors, kept exactly, in slot order (CSS syntax)"
},
"background": {
"type": "string",
"default": "#ffffff",
"description": "Chart background color"
},
"grid": {
"type": "string",
"description": "Gridline color; defaults to a light or dark gray to match the background"
},
"posture": {
"type": "string",
"enum": [
"kpi",
"comparative",
"exploratory"
],
"default": "comparative",
"description": "kpi: few strong colors; comparative: balanced; exploratory: many muted"
}
},
"additionalProperties": false,
"$schema": "http://json-schema.org/draft-07/schema#"
}🟢audit_palette(colors, background, ramp)
Audit existing chart colors for accessibility: pairwise OKLab separation under normal vision, deuteranopia, protanopia, tritanopia and achromatopsia, plus WCAG 2.2 non-text contrast (3:1) of every color against the chart background. Returns a pass / warn / fail verdict with the numbers behind it. Set ramp=true for sequential or diverging scales, whose steps are meant to be close.
入力スキーマ
{
"type": "object",
"properties": {
"colors": {
"type": "array",
"items": {
"type": "string"
},
"minItems": 1,
"maxItems": 24,
"description": "Palette colors in slot order (CSS syntax)"
},
"background": {
"type": "string",
"default": "#ffffff",
"description": "Chart background color"
},
"ramp": {
"type": "boolean",
"default": false,
"description": "true for a sequential or diverging scale (skips pairwise separation)"
}
},
"required": [
"colors"
],
"additionalProperties": false,
"$schema": "http://json-schema.org/draft-07/schema#"
}🟢simulate_palette(colors, modes)
Show what each color looks like to readers with deuteranopia, protanopia, tritanopia or achromatopsia (published Machado 2009 matrices), so an assistant can describe or render the palette as a colorblind reader sees it.
入力スキーマ
{
"type": "object",
"properties": {
"colors": {
"type": "array",
"items": {
"type": "string"
},
"minItems": 1,
"maxItems": 24,
"description": "Colors in slot order (CSS syntax)"
},
"modes": {
"type": "array",
"items": {
"type": "string",
"enum": [
"normal",
"deutan",
"protan",
"tritan",
"achromatopsia"
]
},
"description": "Vision modes to simulate; default all"
}
},
"required": [
"colors"
],
"additionalProperties": false,
"$schema": "http://json-schema.org/draft-07/schema#"
}🟢build_ramp(kind, start, end, mid, steps, ...)
Build an evenly spaced perceptual (OKLab) color scale: sequential from start to end, or diverging from start through mid to end. Returns the steps and a background-contrast audit (pairwise separation is not judged for ramps).
入力スキーマ
{
"type": "object",
"properties": {
"kind": {
"type": "string",
"enum": [
"sequential",
"diverging"
]
},
"start": {
"type": "string",
"description": "First color (or the negative end of a diverging scale)"
},
"end": {
"type": "string",
"description": "Last color (or the positive end)"
},
"mid": {
"type": "string",
"description": "Middle color for a diverging scale; default a neutral near the background"
},
"steps": {
"type": "integer",
"minimum": 3,
"maximum": 24,
"default": 7
},
"background": {
"type": "string",
"default": "#ffffff"
}
},
"required": [
"kind",
"start",
"end"
],
"additionalProperties": false,
"$schema": "http://json-schema.org/draft-07/schema#"
}コミュニティ
エビデンス