Koskamo

Chart Color System MCP

A read-only MCP server that solves chart palettes around brand colors, audits existing colors for WCAG contrast and colorblind accessibility, simulates colorblind vision, and builds sequential or diverging scales using OKLab ΔE measurements.

Endpoint and access

No sign-in to connect and list tools. Individual tools may still need a vendor account, credentials, or permissions; check the documented prerequisites.

Chart Color System MCP logo, by socraticstaticCommunity listingStreamable HTTPNo sign-inEndpoint checked 2026-11-07Published by socraticstatic
MCP endpoint (Streamable HTTP)
https://chart-color-mcp.vercel.app/mcp
Vendor documentation

What its tools do

4 tools, grouped by the hints the server advertises. Hints are self-declared, not verified behavior.

Read-only (4)

4 of 4 have a description · 4 of 4 declare behavior hints · 3 of 4 with parameters document them all

Checks and signals

Each line is separate evidence, not a trust score.

  • Passed Endpoint answered the live check ·
  • Availability 1 of 1 checks passed in 30 days

What you can do with it

  • Solve a categorical palette of n colors keeping anchor colors in slot order
  • Audit existing colors for pairwise OKLab separation and WCAG contrast
  • Simulate how a palette appears under deuteranopia, protanopia, or tritanopia
  • Build an evenly spaced perceptual sequential or diverging scale

Source and maintenance

Community listingRegistry 0.1.2
mcp-registry: io.github.socraticstatic/chart-color-system@0.1.2Source repositoryProject website
Maintenance checked

Protocol and capabilities

Server
chart-color-system 0.1.2
MCP protocol negotiated in check
2025-11-25
Tools
4 advertised
Resources
Not advertised
Resource templates
Not advertised
Prompts
Not advertised
Server-advertised capabilities
{
  "tools": {
    "listChanged": true
  }
}

Server-provided instructions

Untrusted server output shown for inspection. It is not Koskamo guidance and is excluded from knowledge search.

The Chart Color System solves, audits and simulates chart color palettes: categorical palettes that stay distinguishable under normal vision and colorblindness (deuteranopia, protanopia, tritanopia, achromatopsia), with WCAG non-text contrast against the chart background. Use solve_palette when the user needs colors (pass brand colors as anchors; they are kept exactly, in slot order). Use audit_palette to judge colors they already have. Use simulate_palette to show what a colorblind reader sees. Use build_ramp for sequential or diverging scales. Numbers are OKLab distances and WCAG contrast ratios from engine 0.8.0; report them and the relaxations honestly. The honest safe cap for categorical slots is 6; above that, recommend a second encoding (shape, dash, position). Every result carries app_url; offer it so the user can open the palette in the app.

Tools

4 advertised

solve_palette — Solve a chart palette
Advertised by the server during the last successful anonymous check.
Advertised read-only

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.

solve_palette input schema
{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "properties": {
    "n": {
      "type": "integer",
      "default": 6,
      "maximum": 12,
      "minimum": 1,
      "description": "Number of categorical slots"
    },
    "grid": {
      "type": "string",
      "description": "Gridline color; defaults to a light or dark gray to match the background"
    },
    "anchors": {
      "type": "array",
      "items": {
        "type": "string"
      },
      "default": [],
      "maxItems": 12,
      "description": "Brand or required colors, kept exactly, in slot order (CSS syntax)"
    },
    "posture": {
      "enum": [
        "kpi",
        "comparative",
        "exploratory"
      ],
      "type": "string",
      "default": "comparative",
      "description": "kpi: few strong colors; comparative: balanced; exploratory: many muted"
    },
    "background": {
      "type": "string",
      "default": "#ffffff",
      "description": "Chart background color"
    }
  },
  "additionalProperties": false
}
solve_palette annotations
{
  "readOnlyHint": true,
  "openWorldHint": false,
  "idempotentHint": true,
  "destructiveHint": false
}
audit_palette — Audit a chart palette
Advertised by the server during the last successful anonymous check.
Advertised read-only

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.

audit_palette input schema
{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "colors"
  ],
  "properties": {
    "ramp": {
      "type": "boolean",
      "default": false,
      "description": "true for a sequential or diverging scale (skips pairwise separation)"
    },
    "colors": {
      "type": "array",
      "items": {
        "type": "string"
      },
      "maxItems": 24,
      "minItems": 1,
      "description": "Palette colors in slot order (CSS syntax)"
    },
    "background": {
      "type": "string",
      "default": "#ffffff",
      "description": "Chart background color"
    }
  },
  "additionalProperties": false
}
audit_palette annotations
{
  "readOnlyHint": true,
  "openWorldHint": false,
  "idempotentHint": true,
  "destructiveHint": false
}
simulate_palette — Simulate colorblind vision
Advertised by the server during the last successful anonymous check.
Advertised read-only

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.

simulate_palette input schema
{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "colors"
  ],
  "properties": {
    "modes": {
      "type": "array",
      "items": {
        "enum": [
          "normal",
          "deutan",
          "protan",
          "tritan",
          "achromatopsia"
        ],
        "type": "string"
      },
      "description": "Vision modes to simulate; default all"
    },
    "colors": {
      "type": "array",
      "items": {
        "type": "string"
      },
      "maxItems": 24,
      "minItems": 1,
      "description": "Colors in slot order (CSS syntax)"
    }
  },
  "additionalProperties": false
}
simulate_palette annotations
{
  "readOnlyHint": true,
  "openWorldHint": false,
  "idempotentHint": true,
  "destructiveHint": false
}
build_ramp — Build a sequential or diverging ramp
Advertised by the server during the last successful anonymous check.
Advertised read-only

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).

build_ramp input schema
{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "kind",
    "start",
    "end"
  ],
  "properties": {
    "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"
    },
    "kind": {
      "enum": [
        "sequential",
        "diverging"
      ],
      "type": "string"
    },
    "start": {
      "type": "string",
      "description": "First color (or the negative end of a diverging scale)"
    },
    "steps": {
      "type": "integer",
      "default": 7,
      "maximum": 24,
      "minimum": 3
    },
    "background": {
      "type": "string",
      "default": "#ffffff"
    }
  },
  "additionalProperties": false
}
build_ramp annotations
{
  "readOnlyHint": true,
  "openWorldHint": false,
  "idempotentHint": true,
  "destructiveHint": false
}

Prompts

Not advertised

No prompt definitions available.

Resources

Not advertised

No resource definitions available.

90-day uptime

A lightweight connection check about every six hours, sampled on hosts with many listings. It shows the server answered, not that its tools work.

Too few checks for a percentage yet (1 of 1 answered).

  1. 2026-11-07: 1 of 1 checks answered

30-day availability

Aggregated from read-only remote checks; this is not a tool-execution or security guarantee.

Successful checks
1 of 1 (100%)
Average latency
433 ms
95th percentile latency
433 ms

Maintenance history

Public check and source-refresh events. Editorial and ownership records remain private.

  • · probe · passed · 433 ms · metadata changed · 4 tool(s)

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers the remote server. Use --scope project to write .mcp.json for the repo.
Claude Code configuration
claude mcp add --transport http chart-color-system-mcp https://chart-color-mcp.vercel.app/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).
Codex configuration
codex mcp add chart-color-system-mcp --url https://chart-color-mcp.vercel.app/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable chart-color-system-mcp in your MCP settings.
Cursor configuration
{
  "mcpServers": {
    "chart-color-system-mcp": {
      "url": "https://chart-color-mcp.vercel.app/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure).
Cline configuration
{
  "mcpServers": {
    "chart-color-system-mcp": {
      "type": "streamableHttp",
      "url": "https://chart-color-mcp.vercel.app/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start chart-color-system-mcp and inspect its tools.
VS Code configuration
{
  "servers": {
    "chart-color-system-mcp": {
      "type": "http",
      "url": "https://chart-color-mcp.vercel.app/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.
Gemini CLI configuration
gemini mcp add --transport http chart-color-system-mcp https://chart-color-mcp.vercel.app/mcp

Claude Desktop

Open Claude Settings > Connectors > Add custom connector, enter this server URL and enable it for the conversation. This is a manual remote-connector handoff, not a desktop JSON configuration.
Claude Desktop configuration
https://chart-color-mcp.vercel.app/mcp

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.
Windsurf configuration
{
  "mcpServers": {
    "chart-color-system-mcp": {
      "serverUrl": "https://chart-color-mcp.vercel.app/mcp"
    }
  }
}

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