# Chart Color System (remote · chart-color-mcp.vercel.app)

Solve, audit and simulate colorblind-safe chart palettes. WCAG contrast, OKLab ΔE. Read-only.

- Trust score: 74/100 (medium)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-09-20

## Components

- remote · `chart-color-mcp.vercel.app`: 74/100 (this document), [markdown](https://verifymcp.io/servers/socraticstatic-chart-color-system/chart-color-mcp.md), [page](https://verifymcp.io/servers/socraticstatic-chart-color-system/chart-color-mcp)

## Channel facts

- Endpoint: `https://chart-color-mcp.vercel.app/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `0.1.1`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-09-20.

- **Endpoint Security**: 80/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one.
  - HTTPS is enforced; there's no plaintext access path.
  - The HSTS (Strict-Transport-Security) header is present.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 70/100
  - AI-judged instruction clarity (excellent).
  - Context-footprint check failed: tool/resource definitions use about 733 tokens (~183/item across 4 items; 4 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 13/100
  - Stability observed for 4 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 94/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 81% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 4 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 5 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### How do I install the Chart Color System MCP server?

Chart Color System is a hosted endpoint at https://chart-color-mcp.vercel.app/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add --transport http socraticstatic-chart-color-system 'https://chart-color-mcp.vercel.app/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "socraticstatic-chart-color-system": {
      "url": "https://chart-color-mcp.vercel.app/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "socraticstatic-chart-color-system": {
      "type": "http",
      "url": "https://chart-color-mcp.vercel.app/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.socraticstatic-chart-color-system]
url = "https://chart-color-mcp.vercel.app/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "socraticstatic-chart-color-system": {
      "type": "remote",
      "url": "https://chart-color-mcp.vercel.app/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add socraticstatic-chart-color-system --url 'https://chart-color-mcp.vercel.app/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  socraticstatic-chart-color-system:
    url: "https://chart-color-mcp.vercel.app/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "socraticstatic-chart-color-system": {
      "Transport": "http",
      "Url": "https://chart-color-mcp.vercel.app/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add socraticstatic-chart-color-system -t streamable-http -u 'https://chart-color-mcp.vercel.app/mcp'
```

### Other

```json
{
  "mcpServers": {
    "socraticstatic-chart-color-system": {
      "type": "http",
      "url": "https://chart-color-mcp.vercel.app/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-09-19 (score 74, +1)

No change was recorded against any check on this day. Stability & Change Management went from 7 to 10. That category is still filling its 30-day observation window: 2 days of observed history at the previous scan, 3 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-17 (score 73, +1)

- [functional improvement] Stability: unverified → 0.03

### 2026-09-16 (score 72)

First indexed and scored.

## MCP tools (4)

### `solve_palette` (~180 tokens)

Solve a chart palette

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.

Input parameters:

- `anchors` (array): Brand or required colors, kept exactly, in slot order (CSS syntax)
- `background` (string): Chart background color
- `grid` (string): Gridline color; defaults to a light or dark gray to match the background
- `n` (integer): Number of categorical slots
- `posture` (string): kpi: few strong colors; comparative: balanced; exploratory: many muted

### `audit_palette` (~144 tokens)

Audit a chart palette

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.

Input parameters:

- `background` (string): Chart background color
- `colors` (array, required): Palette colors in slot order (CSS syntax)
- `ramp` (boolean): true for a sequential or diverging scale (skips pairwise separation)

### `simulate_palette` (~88 tokens)

Simulate colorblind vision

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.

Input parameters:

- `colors` (array, required): Colors in slot order (CSS syntax)
- `modes` (array): Vision modes to simulate; default all

### `build_ramp` (~132 tokens)

Build a sequential or diverging ramp

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).

Input parameters:

- `background` (string)
- `end` (string, required): Last color (or the positive end)
- `kind` (string, required)
- `mid` (string): Middle color for a diverging scale; default a neutral near the background
- `start` (string, required): First color (or the negative end of a diverging scale)
- `steps` (integer)

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/socraticstatic-chart-color-system/chart-color-mcp#diagnostics

## Score history

- 2026-09-20: 74
- 2026-09-19: 74
- 2026-09-18: 73
- 2026-09-17: 73
- 2026-09-16: 72

## Common questions

### What is the Chart Color System MCP server?

Chart Color System is an MCP server listed in the public MCP registry as io.github.socraticstatic/chart-color-system. Solve, audit and simulate colorblind-safe chart palettes. WCAG contrast, OKLab ΔE. Read-only. This page covers its hosted endpoint (https://chart-color-mcp.vercel.app/mcp).

### Is the Chart Color System MCP server safe to use?

Chart Color System scores 74 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the Chart Color System MCP server expose?

Chart Color System exposes 4 tools: solve_palette, audit_palette, simulate_palette, build_ramp. Their descriptions and schemas cost roughly 544 tokens of context every time the server is loaded.

### Does the Chart Color System MCP server require authentication?

No. We connected to Chart Color System without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the Chart Color System MCP server still maintained?

Chart Color System is still listed as active in the MCP registry. We last reached this channel on 20 September 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://chart-color-mcp.vercel.app/mcp
- Repository: https://github.com/socraticstatic/Visualizations
- Website: https://socraticstatic.github.io/Visualizations/mcp-docs.html
- Changelog RSS feed: https://verifymcp.io/servers/socraticstatic-chart-color-system/chart-color-mcp.xml
- Changelog JSON feed: https://verifymcp.io/servers/socraticstatic-chart-color-system/chart-color-mcp.json
- HTML version of this page: https://verifymcp.io/servers/socraticstatic-chart-color-system/chart-color-mcp