From 567475fd39cd56bee419254b978f5ff6b55113e6 Mon Sep 17 00:00:00 2001
From: Claude <noreply@anthropic.com>
Date: Sun, 31 May 2026 16:36:47 +0000
Subject: [PATCH] v2 truth layer: accessibility MCP tool (WCAG contrast),
 model-agnostic
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

The first piece of v2's 'seam' — turning a checkable claim from narrative into
evidence. Designpowers asserts things are 'accessible'; this measures it.

mcp-tools/accessibility/:
- wcag.js — pure, zero-dependency WCAG 2.2 contrast logic (relative luminance,
  contrast ratio, AA/AAA thresholds incl. large-text/UI 3.0). The 'truth',
  deliberately separate from the protocol plumbing so it's unit-testable.
- server.js — thin MCP adapter exposing check_contrast (one pair) and
  check_palette (many). Returns human-readable text + structuredContent.
- Tests: 11 pure-logic checks (verified against WCAG reference values — black/
  white=21:1 — and the by-hand smoke-test numbers) + 5 live MCP round-trip
  checks (real client launches the server over stdio, lists tools, calls them).
  16/16 green.

Speaks MCP, so it works with ANY MCP client — Claude AND Gemini (README shows
identical wiring for both). This satisfies the hard 'must work on both'
constraint: the tool is model-agnostic by construction, nothing Claude-specific.

Also: wired design-md's accessibility overlay to MEASURE via this tool rather
than estimate contrast from hex; added CI (check-mcp-tools.yml); gitignore for
node_modules. Repo nets (consistency, routing) still pass.
---
 .github/workflows/check-mcp-tools.yml     |   29 +
 .gitignore                                |    1 +
 mcp-tools/accessibility/README.md         |   55 +
 mcp-tools/accessibility/package-lock.json | 1156 +++++++++++++++++++++
 mcp-tools/accessibility/package.json      |   18 +
 mcp-tools/accessibility/server.js         |   97 ++
 mcp-tools/accessibility/server.test.mjs   |   75 ++
 mcp-tools/accessibility/wcag.js           |   80 ++
 mcp-tools/accessibility/wcag.test.mjs     |   57 +
 skills/design-md/SKILL.md                 |    2 +-
 10 files changed, 1569 insertions(+), 1 deletion(-)
 create mode 100644 .github/workflows/check-mcp-tools.yml
 create mode 100644 .gitignore
 create mode 100644 mcp-tools/accessibility/README.md
 create mode 100644 mcp-tools/accessibility/package-lock.json
 create mode 100644 mcp-tools/accessibility/package.json
 create mode 100644 mcp-tools/accessibility/server.js
 create mode 100644 mcp-tools/accessibility/server.test.mjs
 create mode 100644 mcp-tools/accessibility/wcag.js
 create mode 100644 mcp-tools/accessibility/wcag.test.mjs

diff --git a/.github/workflows/check-mcp-tools.yml b/.github/workflows/check-mcp-tools.yml
new file mode 100644
index 0000000..4c8be03
--- /dev/null
+++ b/.github/workflows/check-mcp-tools.yml
@@ -0,0 +1,29 @@
+name: Check MCP tools
+
+# Tests the v2 truth-layer MCP tools: the pure WCAG logic and a live MCP
+# round-trip against the server. Runs on PRs and pushes touching the tools.
+
+on:
+  workflow_dispatch: {}
+  pull_request:
+    paths:
+      - "mcp-tools/**"
+      - ".github/workflows/check-mcp-tools.yml"
+  push:
+    branches: ["main"]
+    paths:
+      - "mcp-tools/**"
+
+jobs:
+  accessibility-tool:
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: mcp-tools/accessibility
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: "22"
+      - run: npm install
+      - run: npm test
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..c2658d7
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+node_modules/
diff --git a/mcp-tools/accessibility/README.md b/mcp-tools/accessibility/README.md
new file mode 100644
index 0000000..226780a
--- /dev/null
+++ b/mcp-tools/accessibility/README.md
@@ -0,0 +1,55 @@
+# Designpowers Accessibility MCP tool
+
+The first **truth-layer** tool for Designpowers v2. It computes **WCAG 2.2 colour-contrast facts** — measured ratios and pass/fail — so an agent gets *evidence* instead of estimating contrast from a screenshot.
+
+It speaks the [Model Context Protocol](https://modelcontextprotocol.io), so it works with **any MCP client — Claude and Gemini alike.** The design knowledge stays portable markdown; this supplies the checkable facts.
+
+## Why this exists
+
+Designpowers' workflow is mostly prose an LLM performs. Most of that is *judgment* (taste, craft) and rightly stays prose. But some claims have a **checkable answer** — contrast is the clearest. This tool turns "the reviewer says it's accessible" into "the Save button is 2.19:1 — FAIL AA," with no model guesswork. It's deliberately split into:
+
+- `wcag.js` — pure, zero-dependency WCAG logic (the truth; unit-tested)
+- `server.js` — a thin MCP adapter over it (the protocol plumbing)
+
+## Tools
+
+- **`check_contrast`** — one foreground/background pair → ratio + AA/AAA pass/fail. `textSize: "large"` uses the 3.0 threshold (≥18pt, or ≥14pt bold, and UI components).
+- **`check_palette`** — many pairs at once (a whole screen or a `DESIGN.md` palette) → per-pair results + a pass/fail summary.
+
+Both return human-readable text **and** `structuredContent` (machine-readable: `ratio`, `passAA`, `passAAA`, thresholds).
+
+## Install
+
+```bash
+cd mcp-tools/accessibility
+npm install
+npm test   # 16 checks: pure WCAG logic + a live MCP round-trip
+```
+
+## Wire it into an agent
+
+### Claude Code / Claude Agent SDK
+Add to your MCP config (e.g. `.mcp.json` or `claude mcp add`):
+```json
+{
+  "mcpServers": {
+    "designpowers-accessibility": {
+      "command": "node",
+      "args": ["mcp-tools/accessibility/server.js"]
+    }
+  }
+}
+```
+
+### Gemini CLI
+Gemini CLI also speaks MCP — add the same server to its `settings.json` `mcpServers` block (the command/args are identical). The tool is model-agnostic by construction; nothing in it is Claude-specific.
+
+## Example
+
+```
+check_contrast { foreground: "#9aa0a6", background: "#e8eaed", label: "Save button" }
+→ Save button: #9aa0a6 on #e8eaed (normal)
+  Contrast ratio: 2.19:1
+  WCAG AA (>=4.5): FAIL
+  Verdict: FAIL (below AA)
+```
diff --git a/mcp-tools/accessibility/package-lock.json b/mcp-tools/accessibility/package-lock.json
new file mode 100644
index 0000000..e09e37e
--- /dev/null
+++ b/mcp-tools/accessibility/package-lock.json
@@ -0,0 +1,1156 @@
+{
+  "name": "accessibility",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
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+    "": {
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+      }
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+      "license": "MIT",
+      "engines": {
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+      },
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+      }
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diff --git a/mcp-tools/accessibility/package.json b/mcp-tools/accessibility/package.json
new file mode 100644
index 0000000..c616b2e
--- /dev/null
+++ b/mcp-tools/accessibility/package.json
@@ -0,0 +1,18 @@
+{
+  "name": "@designpowers/accessibility-mcp",
+  "version": "0.1.0",
+  "description": "Designpowers v2 truth-layer MCP tool: deterministic WCAG 2.2 contrast checks, callable from any MCP client (Claude or Gemini).",
+  "type": "module",
+  "main": "server.js",
+  "bin": {
+    "designpowers-accessibility": "server.js"
+  },
+  "scripts": {
+    "start": "node server.js",
+    "test": "node wcag.test.mjs && node server.test.mjs"
+  },
+  "license": "MIT",
+  "dependencies": {
+    "@modelcontextprotocol/sdk": "^1.29.0"
+  }
+}
diff --git a/mcp-tools/accessibility/server.js b/mcp-tools/accessibility/server.js
new file mode 100644
index 0000000..f771028
--- /dev/null
+++ b/mcp-tools/accessibility/server.js
@@ -0,0 +1,97 @@
+#!/usr/bin/env node
+// Designpowers accessibility MCP server.
+//
+// A thin protocol adapter over the pure WCAG logic in wcag.js. It exposes the
+// deterministic contrast checks as MCP tools so any MCP-speaking agent — Claude
+// or Gemini — can get *evidence* (measured ratios, pass/fail) instead of
+// guessing contrast from a screenshot.
+//
+// This is Designpowers v2's first "truth layer" tool: the design process stays
+// model-agnostic markdown, the checkable facts come from real code.
+//
+// Run: node server.js   (communicates over stdio per the MCP spec)
+import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
+import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
+import { z } from "zod";
+import { contrastRatio, evaluatePair, evaluatePairs } from "./wcag.js";
+
+const server = new McpServer({
+  name: "designpowers-accessibility",
+  version: "0.1.0",
+});
+
+// --- Tool 1: check a single foreground/background pair ---
+server.registerTool(
+  "check_contrast",
+  {
+    title: "Check colour contrast (WCAG 2.2)",
+    description:
+      "Compute the contrast ratio between a foreground and background colour and " +
+      "report pass/fail against WCAG 2.2 AA and AAA. Use this instead of estimating " +
+      "contrast from a screenshot — it returns measured evidence. textSize 'large' " +
+      "(>=18pt or >=14pt bold) and UI components use the 3.0 threshold.",
+    inputSchema: {
+      foreground: z.string().describe('Foreground/text hex colour, e.g. "#1d2430"'),
+      background: z.string().describe('Background hex colour, e.g. "#ffffff"'),
+      textSize: z.enum(["normal", "large"]).default("normal").describe("normal = body text (AA 4.5); large = >=18pt or >=14pt bold, and UI components (AA 3.0)"),
+      label: z.string().optional().describe("Optional label for what this pair is, e.g. 'primary button'"),
+    },
+  },
+  async ({ foreground, background, textSize, label }) => {
+    const r = evaluatePair({ foreground, background, textSize, label: label || "" });
+    const verdict = r.passAAA ? "PASS (AAA)" : r.passAA ? "PASS (AA)" : "FAIL (below AA)";
+    const text =
+      `${label ? label + ": " : ""}${foreground} on ${background} (${textSize})\n` +
+      `Contrast ratio: ${r.ratio}:1\n` +
+      `WCAG AA (>=${r.aaThreshold}): ${r.passAA ? "PASS" : "FAIL"}\n` +
+      `WCAG AAA (>=${r.aaaThreshold}): ${r.passAAA ? "PASS" : "FAIL"}\n` +
+      `Verdict: ${verdict}`;
+    return {
+      content: [{ type: "text", text }],
+      structuredContent: r,
+      isError: false,
+    };
+  }
+);
+
+// --- Tool 2: check many pairs at once (a whole palette/screen) ---
+server.registerTool(
+  "check_palette",
+  {
+    title: "Check many contrast pairs (WCAG 2.2)",
+    description:
+      "Evaluate a list of foreground/background pairs at once — e.g. every text/surface " +
+      "combination on a screen or in a DESIGN.md palette. Returns each result plus a " +
+      "summary of how many pass/fail WCAG AA.",
+    inputSchema: {
+      pairs: z
+        .array(
+          z.object({
+            foreground: z.string(),
+            background: z.string(),
+            textSize: z.enum(["normal", "large"]).default("normal"),
+            label: z.string().optional(),
+          })
+        )
+        .describe("List of colour pairs to check"),
+    },
+  },
+  async ({ pairs }) => {
+    const { results, summary } = evaluatePairs(pairs);
+    const lines = results.map((r) => {
+      const v = r.passAAA ? "AAA" : r.passAA ? "AA" : "FAIL";
+      return `  ${(r.label || `${r.foreground} on ${r.background}`).padEnd(34)} ${String(r.ratio).padStart(6)}:1  ${v}`;
+    });
+    const text = `Checked ${summary.total} pair(s) — ${summary.verdict}\n` + lines.join("\n");
+    return {
+      content: [{ type: "text", text }],
+      structuredContent: { results, summary },
+      isError: false,
+    };
+  }
+);
+
+const transport = new StdioServerTransport();
+await server.connect(transport);
+// stderr is safe for logs (stdout is the MCP channel)
+console.error("designpowers-accessibility MCP server running on stdio");
diff --git a/mcp-tools/accessibility/server.test.mjs b/mcp-tools/accessibility/server.test.mjs
new file mode 100644
index 0000000..a47ff2b
--- /dev/null
+++ b/mcp-tools/accessibility/server.test.mjs
@@ -0,0 +1,75 @@
+// End-to-end MCP smoke test: launches server.js over stdio via a real MCP
+// client, lists tools, and calls them — proving the server actually speaks the
+// protocol, not just that the file parses. Run: node server.test.mjs
+import { Client } from "@modelcontextprotocol/sdk/client/index.js";
+import { StdioClientTransport } from "@modelcontextprotocol/sdk/client/stdio.js";
+import assert from "node:assert";
+import { fileURLToPath } from "node:url";
+import { dirname, join } from "node:path";
+
+const here = dirname(fileURLToPath(import.meta.url));
+let pass = 0, fail = 0;
+const ok = (n) => { pass++; console.log("  ✓ " + n); };
+const no = (n, e) => { fail++; console.log("  ✗ " + n + " — " + e.message); };
+
+const transport = new StdioClientTransport({
+  command: process.execPath,
+  args: [join(here, "server.js")],
+});
+const client = new Client({ name: "test", version: "0.0.0" });
+
+console.log("MCP server e2e tests");
+try {
+  await client.connect(transport);
+  ok("server connects over stdio");
+
+  const { tools } = await client.listTools();
+  const names = tools.map((t) => t.name).sort();
+  try { assert.deepEqual(names, ["check_contrast", "check_palette"]); ok("advertises check_contrast + check_palette"); }
+  catch (e) { no("advertises expected tools", e); }
+
+  // check_contrast on a known failing pair
+  try {
+    const res = await client.callTool({
+      name: "check_contrast",
+      arguments: { foreground: "#9aa0a6", background: "#e8eaed", label: "Save button" },
+    });
+    const sc = res.structuredContent;
+    assert.ok(Math.abs(sc.ratio - 2.19) < 0.03, `ratio ${sc.ratio}`);
+    assert.equal(sc.passAA, false);
+    assert.match(res.content[0].text, /FAIL/);
+    ok("check_contrast returns measured ratio + FAIL for low-contrast pair");
+  } catch (e) { no("check_contrast works", e); }
+
+  // check_contrast on a known passing pair
+  try {
+    const res = await client.callTool({
+      name: "check_contrast",
+      arguments: { foreground: "#000000", background: "#ffffff" },
+    });
+    assert.equal(res.structuredContent.ratio, 21);
+    assert.equal(res.structuredContent.passAAA, true);
+    ok("check_contrast: black on white = 21, AAA");
+  } catch (e) { no("check_contrast passing pair", e); }
+
+  // check_palette batch
+  try {
+    const res = await client.callTool({
+      name: "check_palette",
+      arguments: { pairs: [
+        { foreground: "#000", background: "#fff", label: "body" },
+        { foreground: "#9aa0a6", background: "#e8eaed", label: "save" },
+      ] },
+    });
+    assert.equal(res.structuredContent.summary.total, 2);
+    assert.equal(res.structuredContent.summary.failAA, 1);
+    ok("check_palette summarises a multi-pair check");
+  } catch (e) { no("check_palette works", e); }
+} catch (e) {
+  no("server connection", e);
+} finally {
+  await client.close().catch(() => {});
+}
+
+console.log(`\n${pass} passed, ${fail} failed`);
+process.exit(fail === 0 ? 0 : 1);
diff --git a/mcp-tools/accessibility/wcag.js b/mcp-tools/accessibility/wcag.js
new file mode 100644
index 0000000..89be342
--- /dev/null
+++ b/mcp-tools/accessibility/wcag.js
@@ -0,0 +1,80 @@
+// Pure WCAG contrast logic — deterministic, zero-dependency, unit-testable.
+//
+// This is the "truth layer": it computes facts (contrast ratios, pass/fail
+// against WCAG 2.2), not judgments. It is intentionally separate from the MCP
+// wrapper (server.js) so the math can be verified in CI without any protocol
+// or network plumbing. The MCP server is a thin adapter over these functions.
+
+/** Parse a hex colour (#rgb, #rrggbb, with/without #) to {r,g,b} 0-255. */
+export function parseHex(hex) {
+  if (typeof hex !== "string") throw new Error(`colour must be a string, got ${typeof hex}`);
+  let h = hex.trim().replace(/^#/, "");
+  if (/^[0-9a-fA-F]{3}$/.test(h)) h = h.split("").map((c) => c + c).join("");
+  if (!/^[0-9a-fA-F]{6}$/.test(h)) throw new Error(`invalid hex colour: "${hex}"`);
+  return {
+    r: parseInt(h.slice(0, 2), 16),
+    g: parseInt(h.slice(2, 4), 16),
+    b: parseInt(h.slice(4, 6), 16),
+  };
+}
+
+/** sRGB channel (0-255) -> linear value, per WCAG. */
+function linearize(channel) {
+  const c = channel / 255;
+  return c <= 0.03928 ? c / 12.92 : Math.pow((c + 0.055) / 1.055, 2.4);
+}
+
+/** Relative luminance of a hex colour, per WCAG 2.x. */
+export function relativeLuminance(hex) {
+  const { r, g, b } = parseHex(hex);
+  return 0.2126 * linearize(r) + 0.7152 * linearize(g) + 0.0722 * linearize(b);
+}
+
+/** Contrast ratio between two hex colours (1.0–21.0), rounded to 2 dp. */
+export function contrastRatio(fg, bg) {
+  const l1 = relativeLuminance(fg);
+  const l2 = relativeLuminance(bg);
+  const lighter = Math.max(l1, l2);
+  const darker = Math.min(l1, l2);
+  return Math.round(((lighter + 0.05) / (darker + 0.05)) * 100) / 100;
+}
+
+/**
+ * Evaluate a foreground/background pair against WCAG 2.2 contrast minimums.
+ * `textSize`: "normal" (default) or "large" (>=18pt, or >=14pt bold).
+ * Large text and UI components use the 3.0 threshold; normal text uses 4.5 (AA)
+ * and 7.0 (AAA).
+ */
+export function evaluatePair({ foreground, background, textSize = "normal", label = "" }) {
+  const ratio = contrastRatio(foreground, background);
+  const large = textSize === "large";
+  const aaThreshold = large ? 3.0 : 4.5;
+  const aaaThreshold = large ? 4.5 : 7.0;
+  return {
+    label,
+    foreground,
+    background,
+    textSize,
+    ratio,
+    aaThreshold,
+    aaaThreshold,
+    passAA: ratio >= aaThreshold,
+    passAAA: ratio >= aaaThreshold,
+  };
+}
+
+/** Evaluate many pairs; returns results plus a summary. */
+export function evaluatePairs(pairs) {
+  const results = pairs.map(evaluatePair);
+  const failingAA = results.filter((r) => !r.passAA);
+  return {
+    results,
+    summary: {
+      total: results.length,
+      passAA: results.filter((r) => r.passAA).length,
+      failAA: failingAA.length,
+      passAAA: results.filter((r) => r.passAAA).length,
+      verdict: failingAA.length === 0 ? "all pairs pass WCAG AA" : `${failingAA.length} pair(s) FAIL WCAG AA`,
+    },
+  };
+}
diff --git a/mcp-tools/accessibility/wcag.test.mjs b/mcp-tools/accessibility/wcag.test.mjs
new file mode 100644
index 0000000..1685fe3
--- /dev/null
+++ b/mcp-tools/accessibility/wcag.test.mjs
@@ -0,0 +1,57 @@
+// Tests for the pure WCAG logic. Run: node wcag.test.mjs
+// No deps — verifies the truth layer against known reference values.
+import { parseHex, contrastRatio, evaluatePair, evaluatePairs } from "./wcag.js";
+import assert from "node:assert";
+
+let pass = 0, fail = 0;
+function check(name, fn) {
+  try { fn(); pass++; console.log("  ✓ " + name); }
+  catch (e) { fail++; console.log("  ✗ " + name + " — " + e.message); }
+}
+
+console.log("WCAG logic tests");
+
+// Hex parsing
+check("parses 6-digit hex", () => assert.deepEqual(parseHex("#2F6F4F"), { r: 47, g: 111, b: 79 }));
+check("parses 3-digit shorthand", () => assert.deepEqual(parseHex("#fff"), { r: 255, g: 255, b: 255 }));
+check("parses without leading #", () => assert.deepEqual(parseHex("000000"), { r: 0, g: 0, b: 0 }));
+check("rejects invalid hex", () => assert.throws(() => parseHex("nope")));
+
+// Reference contrast values (authoritative)
+check("black on white = 21:1", () => assert.equal(contrastRatio("#000000", "#ffffff"), 21));
+check("white on white = 1:1", () => assert.equal(contrastRatio("#ffffff", "#ffffff"), 1));
+check("contrast is symmetric", () => assert.equal(contrastRatio("#777", "#fff"), contrastRatio("#fff", "#777")));
+
+// Real values we computed by hand earlier (the smoke-tests) — must match
+check("Save grey #9aa0a6 on #e8eaed ≈ 2.19 (FAIL)", () => {
+  const r = contrastRatio("#9aa0a6", "#e8eaed");
+  assert.ok(Math.abs(r - 2.19) < 0.03, `got ${r}`);
+});
+check("Verdant leaf #2F6F4F text on white passes AA", () => {
+  const e = evaluatePair({ foreground: "#2F6F4F", background: "#ffffff" });
+  assert.ok(e.passAA, `ratio ${e.ratio}`);
+});
+
+// Threshold logic
+check("3.2 ratio fails AA normal but passes AA large", () => {
+  // pick a pair near 3.2: mid grey on white
+  const normal = evaluatePair({ foreground: "#949494", background: "#ffffff", textSize: "normal" });
+  const large = evaluatePair({ foreground: "#949494", background: "#ffffff", textSize: "large" });
+  assert.equal(normal.aaThreshold, 4.5);
+  assert.equal(large.aaThreshold, 3.0);
+});
+
+// Batch summary
+check("evaluatePairs summarises pass/fail", () => {
+  const { summary } = evaluatePairs([
+    { foreground: "#000", background: "#fff" },          // pass
+    { foreground: "#9aa0a6", background: "#e8eaed" },     // fail
+  ]);
+  assert.equal(summary.total, 2);
+  assert.equal(summary.passAA, 1);
+  assert.equal(summary.failAA, 1);
+  assert.ok(summary.verdict.includes("FAIL"));
+});
+
+console.log(`\n${pass} passed, ${fail} failed`);
+process.exit(fail === 0 ? 0 : 1);
diff --git a/skills/design-md/SKILL.md b/skills/design-md/SKILL.md
index efe0bd3..fb9c1ce 100644
--- a/skills/design-md/SKILL.md
+++ b/skills/design-md/SKILL.md
@@ -84,7 +84,7 @@ The standard ships a CLI (run via `npx`): `lint` (validate structure), `export`
 
 The standard describes brand, not access. Designpowers layers WCAG on top — **accessibility wins over brand**:
 
-- When loading a `DESIGN.md`, **check its colour pairings against WCAG 2.2 AA** (text/background contrast, state colours). If a brand token can't meet contrast in a given use, flag it and adjust (larger size, weight, or a non-colour cue), then note the deviation to the user.
+- When loading a `DESIGN.md`, **check its colour pairings against WCAG 2.2 AA** (text/background contrast, state colours). **Measure, don't estimate:** if the Designpowers accessibility MCP tool is available (`check_contrast` / `check_palette`, see `mcp-tools/accessibility/`), call it to get measured ratios rather than guessing from the hex values — that's evidence, not judgment. If a brand token can't meet contrast in a given use, flag it and adjust (larger size, weight, or a non-colour cue), then note the deviation to the user.
 - Confirm the `typography` scale supports 200% zoom and that components don't rely on colour alone.
 - Record any brand-vs-access tension in `design-state.md`. Never silently ship an inaccessible token just because the brand specified it.