designesy-mcp
A read-only stdio MCP server exposing designesy.org's design-intelligence infrastructure as native agent tools.
Zero external dependencies. Pure Python stdlib. Implements the Model Context Protocol JSON-RPC 2.0 over stdio.
Install
pip install designesy-mcp
Run
designesy-mcp
Or as a module:
python -m designesy_mcp_server
Configure in your MCP client
Add to your MCP client config (Claude Desktop, Cursor, ZCode, etc.):
{
"mcpServers": {
"designesy": {
"command": "designesy-mcp"
}
}
}
No arguments needed. The server speaks JSON-RPC 2.0 over stdin/stdout.
Tools (11)
The server exposes 11 tools, all fetched live from https://www.designesy.org/:
Read-only discovery
| Tool | What it does |
|---|---|
designesy_catalog |
Get the 12-package catalog (versions, URLs, statuses) from /open.json |
designesy_contract |
Get the full design-system contract v0.3.0 (tokens, motion, acoustic, takt, cadence, typography, components, verification, open tensions) — or a filtered section |
designesy_design_review |
Get the Design Review kit (8 dimensions, agent prompt, output format, verification checklist) |
designesy_skill_md |
Get the agent-skill-format export (SKILL.md) with behavioral rules, tokens, anti-patterns |
designesy_agent_json |
Get the agent discovery document (.well-known/agent.json) — identity, authority, ingest protocol |
designesy_llms_txt |
Get the short agent brief (/llms.txt) |
designesy_llms_full_txt |
Get the full agent brief (/llms-full.txt) with ingest protocol, all packages, paste-ready prompt |
Executable verification
| Tool | What it does |
|---|---|
designesy_score |
Run the 36-check contract verification against a live URL. Fetches HTML + CSS, parses :root custom properties, returns PASS/FAIL/WARN/SKIP per check with an overall score, letter grade, and per-category breakdown. Supports 4 emission formats: designesy (default), canonical (review-findings.json schema), review (jakubkrehel markdown), google (@google/design.md JSON). |
designesy_tokens_score |
Validate a design token file against the W3C Design Tokens Community Group (DTCG) 2025.10 format. 10 checks (t01–t10). |
designesy_a11y_score |
Get the WCAG 2.2 AA accessibility verification framework (11 checks, a01–a11) + a Playwright/axe-core script template for local execution. |
designesy_motion_score |
Validate a Lottie animation file against Lottie spec v1.0.1 + the Designesy 10 Non-Negotiable Motion Standards. 10 checks (m01–m10). |
Resources (7)
The server also exposes 7 MCP resources (read-only URIs):
| URI | Content |
|---|---|
designesy://open |
Package catalog (JSON) |
designesy://contract |
Full design-system contract (JSON) |
designesy://kit/design-review |
Design Review kit (JSON) |
designesy://skill |
SKILL.md agent-skill export (Markdown) |
designesy://agent |
Agent discovery document (JSON) |
designesy://llms |
Short agent brief (text) |
designesy://llms-full |
Full agent brief (text) |
The 36-check verification engine
designesy_score runs 36 deterministic checks across 13 weighted categories:
| Category | Weight | What it measures |
|---|---|---|
| cadence | 18 | Typography rhythm — line-height, font-synthesis, text-underline-position, skip-ink |
| accessibility | 15 | WCAG 2.2 primitives — reduced-motion, forced-colors, AI disclosure, focus-visible |
| semantic | 12 | Token architecture — :root custom properties, no raw hex, semantic naming |
| motion | 10 | Motion hygiene — duration tokens, easing tokens, reduced-motion blocks |
| tokens | 9 | DTCG 2025.10 conformance — $type, $value, $description, colorSpace |
| takt | 8 | Timing discipline — transition bands, animation hierarchy |
| poise | 7 | Composure — viewport overflow, scroll behavior, print styles |
| identity | 6 | Brand coherence — title, meta description, favicon, og tags |
| interaction | 6 | Interaction primitives — hover states, press feedback, disabled states |
| performance | 6 | Core Web Vitals readiness — preload, font-display, render-blocking |
| responsive | 3 | Responsive primitives — viewport meta, container queries |
| security | 5 | Security headers — CSP, X-Content-Type-Options, referrer policy |
| spec | 4 | Spec conformance — lang attr, charset, doctype |
No LLM. No roast. The same engine scores designesy.org itself — in public, at 99.1% A.
Caching
All responses are cached with a 5-minute TTL. The server only fetches public, machine-readable exports from designesy.org via HTTPS. It does not read local files, credentials, or source roots.
Safety
Read-only. This server never writes anywhere. It does not execute code, mutate files, or access credentials.
Provenance
All data is fetched live from:
https://www.designesy.org/open.jsonhttps://www.designesy.org/contracts/design-system.jsonhttps://www.designesy.org/kits/design-review.jsonhttps://www.designesy.org/contracts/skillhttps://www.designesy.org/.well-known/agent.jsonhttps://www.designesy.org/llms.txthttps://www.designesy.org/llms-full.txt
License
MIT
Links
1 maintainer
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