Chart Color Audit MCP server

by socraticstatic·io.github.socraticstatic/chart-color-audit·v0.2.5

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CI-friendly accessibility audit for chart color palettes: WCAG contrast, CVD simulation, OKLab ΔE.

A88/100grade A

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Safety scan

A88/100

full report

Adoption

Growing

0 stars78 downloads/wk

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If you have run it, two minutes of your experience saves the next person an afternoon.

Chart Color Audit tools (2, 1 write)

write = sends, deletes, buys or posts

Read from the package source without running it. The installed server may list more.

audit_palette
Audit chart colors for accessibility: pairwise OKLab \u0394E separation under normal vision, deuteranopia, protanopia, tritanopia (published Machado 2009 matrices) and grayscale, plus WCAG 2.2 SC 1.4.11 non-text contrast (\u22653:1) against the background. Returns per-vision findings with human-word bands and a pass/fail verdict with reasons.
audit_tokenswrite action
Run the same audit against a chartaudit.config.json on disk \u2014 the config names a CSS or design-tokens file plus which tokens are the categorical palette, background, and semantic roles.

Public scan report

scanner v0.1.10 · 2026-11-03 · same rubric, same numbers if you re-run it

no findings

Code scan8 source files scanned25/25
–Live reliabilityno gateway calls yet and no remote to proben/a
–Tool poisoningtools not inspected (local package is not executed); not countedn/a
Auth qualitylocal package, no credentials required12/15
Maintenancelast push 30 days ago12/15
Maintainer identityregistry namespace matches repository owner; GitHub account older than a year8/10

Overall 88/100. Components that don't apply are left out of the denominator. Any critical finding is an F.Rubric Appeal a finding JSON

How Chart Color Audit compares

Against every graded Developer tools MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score: 88/100; higher than 75% of 1,119 Developer tools servers
Tools: 2; the typical Developer tools server has 7
Tools that change things: 50%; typical: 5%. Fewer write tools means less an agent can break
Downloads a week: 78; more than 51% of 436 Developer tools servers with a package

What its tools let an agent do: 1 read · 1 change

Release history: 2 versions in the registry since 2026-08-16, latest 2026-10-04, typically one every 49 days.

Install Chart Color Audit in Claude Code, Cursor or VS Code

Runs npx -y chart-color-audit on your machine. Read the scan report first; the gateway never runs local packages.

claude mcp add chart-color-audit -- npx -y chart-color-audit

Add to Cursor

What the publisher says

From the Chart Color Audit repository's README, as published. We do not edit it. Read it on GitHub

chart-color-audit

Accessibility audit for chart color palettes. Answers one question with math: can everyone still tell your data series apart?

Plenty of tools check text contrast. This one checks the thing dashboards actually break: whether your palette survives colorblindness. It simulates deuteranopia, protanopia, and tritanopia with the published Machado, Oliveira & Fernandes 2009 matrices, measures pairwise separation in OKLab, checks WCAG 2.2 contrast against your background, and fails your build when a change quietly breaks any of it.

Four ways in. Pick yours.

1 · Try a palette (nothing to install)

npx chart-color-audit --colors "#4E79A7,#F28E2B,#E15759" --bg "#fff"

chart-color-audit · 3 colors on #ffffff · mode: perceptual

  vision          min ΔE   closest pair   reading
  · normal          14.6   2 ↔ 3        clearly distinct
  · deutan          11.9   2 ↔ 3        clearly distinct
  · protan          11.9   1 ↔ 3        clearly distinct
  · tritan          10.3   2 ↔ 3        clearly distinct
  · achromatopsia    5.2   1 ↔ 3        distinguishable

  contrast vs background: worst 2.42:1 (slot 2, needs ≥ 3:1)
  ✗ slot 2 #f28e2b — 2.42:1

  FAIL — 1 finding:
    · contrast: slot 2 (#f28e2b) is 2.42:1 vs. background (needs ≥ 3:1, WCAG 2.2 SC 1.4.11).

Those three colors separate cleanly under every colorblind simulation. The orange still fails: 2.42:1 against white, below the 3:1 floor for chart marks. Pale bars on white is one of the oldest dashboard sins, and this is it, caught in numbers.

Exit codes: 0 pass, 1 fail, 2 bad input. That is the whole CI contract.

Reading the output

ΔE is perceptual color distance (OKLab × 100). About 2 is the edge of what a human eye can tell apart.

closest pair names the two slots (1-based) that came nearest. Fix those two, re-run, repeat.

CLI

npx chart-color-audit --colors <list> --bg <color> [options]
npx chart-color-audit [--config chartaudit.config.json]
npx chart-color-audit mcp

2 · Gate your CI

Two files, no dependencies added.

Step 1. Put chartaudit.config.json in your repo root, pointed at the tokens you already have:

Shortened. The full README is on GitHub.

Nothing above is checked by us. What we check is on the safety report.

Chart Color Audit: common questions

Is Chart Color Audit MCP server safe?: Yes, by our scan: it is graded A (88/100). Read the Chart Color Audit safety report
How do I install Chart Color Audit?: It runs on your machine. Copy the Claude Code, Cursor, VS Code or Claude Desktop config from the install section.
Does Chart Color Audit need an API key?: Not as far as the registry entry and our scan can tell: no credentials are declared or required.
Is Chart Color Audit maintained?: The last commit was 31 days ago (2026-10-04). The latest release is v0.2.5.
What can I use instead of Chart Color Audit?: Servers from other publishers that do the same job: Observatory MCP server, cloud-audit MCP server and Mason MCP server.
How does Chart Color Audit compare with other Developer tools MCP servers?: safety score 88/100 (higher than 75% of 1,119 Developer tools servers); tools 2 (the typical Developer tools server has 7); tools that change things 50% (typical: 5%. Fewer write tools means less an agent can break). Full comparison.

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