Server definition

Hash: sha256:a4677273b0eb31336f8d4b33fd9ee1d776499399f4ddb5ff81cd8ef727ead53a
What it is: What a remote MCP server returned when asked what it offers: 4 tools

The blob, as servednamed by its sha256

{
  "instructions": "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": [
    {
      "description": "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.",
      "inputSchema": {
        "$schema": "http://json-schema.org/draft-07/schema#",
        "additionalProperties": false,
        "properties": {
          "background": {
            "default": "#ffffff",
            "description": "Chart background color",
            "type": "string"
          },
          "colors": {
            "description": "Palette colors in slot order (CSS syntax)",
            "items": {
              "type": "string"
            },
            "maxItems": 24,
            "minItems": 1,
            "type": "array"
          },
          "ramp": {
            "default": false,
            "description": "true for a sequential or diverging scale (skips pairwise separation)",
            "type": "boolean"
          }
        },
        "required": [
          "colors"
        ],
        "type": "object"
      },
      "name": "audit_palette",
      "outputSchema": null
    },
    {
      "description": "Build an evenly spaced perceptual (OKLab) color scale: sequential from start to end, or diverging from start through mid to end. Returns the steps and a background-contrast audit (pairwise separation is not judged for ramps).",
      "inputSchema": {
        "$schema": "http://json-schema.org/draft-07/schema#",
        "additionalProperties": false,
        "properties": {
          "background": {
            "default": "#ffffff",
            "type": "string"
          },
          "end": {
            "description": "Last color (or the positive end)",
            "type": "string"
          },
          "kind": {
            "enum": [
              "sequential",
              "diverging"
            ],
            "type": "string"
          },
          "mid": {
            "description": "Middle color for a diverging scale; default a neutral near the background",
            "type": "string"
          },
          "start": {
            "description": "First color (or the negative end of a diverging scale)",
            "type": "string"
          },
          "steps": {
            "default": 7,
            "maximum": 24,
            "minimum": 3,
            "type": "integer"
          }
        },
        "required": [
          "kind",
          "start",
          "end"
        ],
        "type": "object"
      },
      "name": "build_ramp",
      "outputSchema": null
    },
    {
      "description": "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.",
      "inputSchema": {
        "$schema": "http://json-schema.org/draft-07/schema#",
        "additionalProperties": false,
        "properties": {
          "colors": {
            "description": "Colors in slot order (CSS syntax)",
            "items": {
              "type": "string"
            },
            "maxItems": 24,
            "minItems": 1,
            "type": "array"
          },
          "modes": {
            "description": "Vision modes to simulate; default all",
            "items": {
              "enum": [
                "normal",
                "deutan",
                "protan",
                "tritan",
                "achromatopsia"
              ],
              "type": "string"
            },
            "type": "array"
          }
        },
        "required": [
          "colors"
        ],
        "type": "object"
      },
      "name": "simulate_palette",
      "outputSchema": null
    },
    {
      "description": "Generate a categorical chart palette of n colors (1-12) that maximizes perceptual separation under normal vision and colorblindness, with the given brand colors locked as anchors in slot order. Returns the palette, the worst pair distances, the engine's relaxation notes, a full accessibility audit against the background, and a link to open it in the app. Honest cap is 6 slots; above that the result says so.",
      "inputSchema": {
        "$schema": "http://json-schema.org/draft-07/schema#",
        "additionalProperties": false,
        "properties": {
          "anchors": {
            "default": [],
            "description": "Brand or required colors, kept exactly, in slot order (CSS syntax)",
            "items": {
              "type": "string"
            },
            "maxItems": 12,
            "type": "array"
          },
          "background": {
            "default": "#ffffff",
            "description": "Chart background color",
            "type": "string"
          },
          "grid": {
            "description": "Gridline color; defaults to a light or dark gray to match the background",
            "type": "string"
          },
          "n": {
            "default": 6,
            "description": "Number of categorical slots",
            "maximum": 12,
            "minimum": 1,
            "type": "integer"
          },
          "posture": {
            "default": "comparative",
            "description": "kpi: few strong colors; comparative: balanced; exploratory: many muted",
            "enum": [
              "kpi",
              "comparative",
              "exploratory"
            ],
            "type": "string"
          }
        },
        "type": "object"
      },
      "name": "solve_palette",
      "outputSchema": null
    }
  ]
}

Verify it yourself

curl -s https://api.teppi.xyz/v1/evidence/sha256:a4677273b0eb31336f8d4b33fd9ee1d776499399f4ddb5ff81cd8ef727ead53a | sha256sum