Open-source MCP Server · MIT

Design intelligence
for every prompt

Twenty-seven tools that give AI the design knowledge once locked in expert heads — principles, patterns, tokens, voice, brand, and more.

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claude — raven-mcp

Eight Knowledge Layers

Eight disciplines, one MCP server

Design, content, brand, research, service, business — every layer your AI is missing, structured for machines to query and apply.

129
Design principles

Principles

Nielsen's Heuristics, Laws of UX, Gestalt, WCAG accessibility, typography, color theory, mobile UX, responsive layout, and D4D—with violations and checklists.

Accessibility Nielsen Gestalt Laws of UX Mobile UX Responsive
22
Pattern libraries

Patterns

Proven UI patterns for signup, pricing, dashboards, forms, navigation, CTAs—plus content patterns (errors, empty states, notifications) and service patterns (blueprinting, handoff).

Landing Pages Pricing Forms Handoff
4
Brand voice systems

Content Systems

Voice & tone from Mailchimp, GOV.UK, Shopify Polaris, and Atlassian. Plus eleven UX-writing principles and content patterns for errors, empty states, notifications, and form validation.

Mailchimp GOV.UK Polaris Atlassian
6
Metrics frameworks

Research & Data

Qualitative, quantitative, and usability methods with protocols, sample-size guidance, and bias traps. Metrics frameworks: HEART, AARRR, North Star, conversion funnel, RICE, OKRs.

HEART AARRR Usability A/B Tests
14
GOV.UK standard

Service Design

Stickdorn, Shostack, moments of truth, peak-end, human-handoff patterns. Plus an HTML service-blueprint generator with two-actor (HI-loop) mode for customer↔lawyer, patient↔doctor flows.

Blueprinting Handoff HI-loop GOV.UK
7
2026 visual trends

Brand & Visual

Logo usage, gradient systems, imagery, visual hierarchy, brand-as-system thinking—plus a time-stamped 2026 trends file (bento grids, monospace for tone, neon-on-glass, brutalism rebound).

Logo Gradient Imagery 2026 Trends
5
Strategy domains

Business Strategy

Monetization, retention, onboarding, growth, and metrics—the business context that shapes every design decision.

Monetization Retention Growth Metrics
12
Design systems

Tokens

Production design system tokens in W3C DTCG format. Compose tokens across systems, export as CSS variables, Figma Variables, or JSON. Generate custom systems from a brand color.

Stripe Linear DTCG Figma

Thirty-One Tools

The full flight across all realms

Each tool is a focused query. Claude calls them automatically—no special syntax, no configuration beyond install.

get_principles
Design principles matched to your UI context—heuristics, laws, accessibility, color theory
get_pattern
Proven patterns with do's, don'ts, and evidence across UI, content, and service-design types
get_business_strategy
Monetization, retention, onboarding, growth, and metrics frameworks
evaluate_design
Score a design description against relevant principles and patterns
search_knowledge
Full-text search across all principles, patterns, and business strategy
get_checklist
Pre-publish quality checklist for any UI type—raise the raven banner
get_d4d_framework
Design for Delight—customer empathy, hypothesis, and experiment templates
list_design_systems
Browse the registry of 12 design systems with tokens and metadata
get_design_system
Full tokens—colors, typography, spacing, radii, elevation, motion
compose_system
Mix tokens from multiple design systems into a custom composition
audit_page
Score any HTML page against Raven's design quality standards — typography, accessibility, responsive, tokens
get_brand_system
Get a complete design system for building an app with branding like any company
generate_design_system
Generate a complete design system from a brand color—export as HTML, CSS, Figma, or SVG
audit_layout
Evaluate a rendered page's visual rhythm, alignment, and optical balance
audit_swiftui
Audit SwiftUI source against Apple's HIG—Dynamic Type, semantic colors, 44pt targets, AccentColor
audit_screen
Score a rendered iOS or Android screen from an accessibility snapshot—44/48pt targets, contrast, visual rhythm
audit_ios_privacy
Audit Info.plist or Expo app.json—usage-string honesty, ATS, bundled secrets, undisclosed data-egress
audit_rn
Audit React Native / Expo source—touchable a11y, 44/48pt targets, font scaling, safe areas, dark mode
list_content_systems
Browse brand voice & tone systems—Mailchimp, GOV.UK, Polaris, Atlassian
get_content_system
A brand's full voice—attributes, tone shifts, vocabulary, grammar, content patterns
get_content_principles
UX-writing principles—clarity, active voice, error anatomy, inclusive language
get_content_pattern
Copy recipes for error messages, empty states, notifications, form validation
get_research_method
Qualitative, quantitative, and usability methods—with protocols and bias traps
get_metrics_framework
HEART, AARRR, North Star, conversion funnel, RICE, OKRs—with examples
get_service_pattern
Blueprinting, human handoff, signup-as-service, omnichannel, moments of truth
get_service_standard
The GOV.UK Service Standard—14 points for service-quality assessment
generate_service_blueprint
Render a service blueprint as HTML—current vs. ideal, with two-actor HI-loop mode
get_brand_principles
Logo usage, gradient rules, imagery, visual hierarchy, brand-as-system
get_brand_trends
2026 visual trends—bento, monospace, neon-on-glass, brutalism, AI imagery
raven_reflect
Summarize your local Raven usage log—tool counts, recurring warnings, gaps

Real Outputs

One tool. Every industry.

Built entirely with Raven's design intelligence. Click any to explore.

Legal
Harrison & Cole
Full-service litigation firm
Wedding
Elara & Co.
Luxury wedding planning
Food & Beverage
Ember & Grain
Specialty coffee roaster
SaaS
Flux
Real-time analytics platform
Fitness
FORGE
Performance training studio
Real Estate
Oleander Residence
$12.5M luxury estate listing

Token Registry

The world's best design systems, queryable

Production tokens from 12 world-class design systems in W3C DTCG format. Platforms, products, and frameworks — all queryable.

Apple HIG
Platform
iOSmacOSpremium
Material Design 3
Platform
Androiddynamic-color
Stripe
Fintech
professionalclean
Linear
Productivity
darkminimal
Airbnb
Consumer
warmtrustworthy
Spotify
Consumer
darkvibrant
Vercel
Developer
monochromeminimal
GitHub Primer
Developer
enterpriseaccessible
Notion
Productivity
warmcontent-first
shadcn/ui
Component Library
tailwindradix
Tailwind CSS
Framework
utility-firstcomprehensive
Supabase
Developer
darkgreen-accent

The Story

Named for the creature that bridges worlds

Across Norse, Celtic, and Native American traditions, the raven carries knowledge from hidden places and brings it into the light.

Odin's ravens Huginn and Muninn—Thought and Memory—fly across all nine realms at dawn and return to whisper everything they've seen. The Morrígan takes raven form to decide fate. Yéil stole the sun from darkness and gave it to everyone.

Raven MCP: design intelligence that used to be locked away, now flying across your work.

Raven
Norse

Huginn & Muninn

Thought & Memory—Odin's ravens that fly across all nine realms and return with knowledge

Celtic

The Morrígan

Sovereignty & Prophecy—the triple goddess who takes raven form to decide fate

Tlingit

Yéil the Transformer

Light from Darkness—Raven stole the sun, moon, and stars and gave them to everyone

Open Source

Free. All of it.

Every tool, every token, every principle — no limits, no tiers, no catch. Raven is open source and always will be.

31 Tools
129 Principles
8 Knowledge Layers
22 Patterns

Design intelligence for every AI-generated interface — accessibility audits, token systems, evaluation scoring, and more. Install in 30 seconds.

Need something custom?

Custom Design Systems

Get a bespoke Raven-compatible design system built for your brand — tokens, principles, evaluation rules, all tailored to your product.

Get in touch →

Get Started

Give your AI
design intelligence

Open source. Zero runtime dependencies. Works with Claude Code and Claude Desktop.

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