DS4AI MCP server

The aggregate endpoint of DS4AI, the Design Suite for AI, from Polymathie-Studio. It serves the suite as callable MCP tools, so a person working with an AI reaches the conformance auditor and the generators through their agent, without calling a function. Unlike the @proof-of-coord standards servers, which point at canonical source, this server runs the primitives, and because it is a process rather than a browser it can fetch a URL and audit the served HTML.

Use it

This server is hosted as a public HTTP endpoint, and is published to npm and JSR as @polymathie/ds4ai. Connect the hosted server with nothing to install:

{
  "mcpServers": {
    "ds4ai": { "type": "http", "url": "https://ds4ai-production.up.railway.app/mcp" }
  }
}

Or run it locally, no clone:

npx @polymathie/ds4ai                 # from npm
deno run -A jsr:@polymathie/ds4ai     # from JSR (Deno)

Add it to an MCP client (Claude Code, Cursor, and the rest) either as the hosted HTTP server above, or as a stdio server whose command is npx @polymathie/ds4ai. The four MCP servers are listed at integritysuite.org/built, and the full reference for every connection method is Using the MCP servers.

Related MCP server: aeo-graph-engine

Tools

• audit_surface { url? , html? }: audit a shipped surface across all six invisible-correctness axes with the MISSING conformance auditor. Give a URL and it fetches and audits the served HTML. Declares the axes a static check cannot judge rather than reporting them clean.

• generate_head, generate_jsonld, generate_sitemap, generate_robots, audit_findability (BEACON): findability head tags, JSON-LD, sitemap, robots.txt, and the depth findability audit.

• generate_image_markup, generate_cache_config, audit_delivery (FLEET): responsive image and picture markup, cache-header config per host, and the depth delivery audit.

• solve_palette, check_contrast (TEMPER): solve a full palette to contrast floors for a mode, and check the WCAG contrast between two colors.

Every result carries a provenance stamp declaring the server and bundled primitive versions.

Resources

• ds4ai://manifest: the DS4AI family manifest (read generically, so it tracks the manifest as its data source).

• ds4ai://agents: the agent-instruction (AGENTS.md), so a connected agent gets the compose-the-suite instruction for free.

• ds4ai://standard: the MISSING standard.

How it is built

TypeScript on the MCP SDK with zod schemas, provenance-stamped, following the @proof-of-coord pattern. The zero-dependency primitives (TEMPER, BEACON, FLEET, and the MISSING conformance auditor) are bundled in, so the server is self-contained, and each tool stamps the primitive version it bundled. Published to npm and JSR under @polymathie.

Security

The URL-auditing path (audit_surface fetching a live URL) is built to a defensive threat model and is adversarially tested and hardened before release against server-side request forgery, denial-of-service, and resource-exhaustion attacks. Fetched content is treated as untrusted input: it is parsed, never executed, and the fetcher connects only to validated public addresses. The implementation is open for review under Apache-2.0.

Part of DS4AI

DS4AI, the Design Suite for AI, from Polymathie-Studio, joins PT4AI and PC4AI in the family of corpora served to an AI. The instruments and the MISSING standard live at Polymathie-Studio.

License

Apache-2.0 for the server. Copyright 2026 Regis Lloyd Chapman. See LICENSE and NOTICE.

The bundled resources keep their own licenses, from the Polymathie-Studio/missing repository: resources/standard.md (the MISSING standard) is dual-licensed CC-BY-4.0; the manifest and AGENTS.md are Apache-2.0. The vendored primitive source under src/vendor/ is Apache-2.0, from its instrument repository.