Raven MCP

Giving any AI assistant access to a curated design knowledge graph, Raven MCP is an MCP server with 99 tools across 9 knowledge layers, live at ravenmcp.ai. It returns tools, not documents — heuristics come back scoped and shaped for a model to act on, not just read. In 2.0, Raven Design adds a second surface: click any element on a live page and edit it directly in the design system's own tokens, changes stacking in a pending tray before they're sent. Underneath is judgment and memory — a design judge that critiques work against the canon, a Taste Engine that makes one designer's judgment portable, and a Decision Graph that remembers why each call was made. I built it because I needed it myself.

What changed.

  • 10,900+

    Installs across Claude, Cursor, and Codex since the April launch — people running Raven inside their AI assistant.

  • 99

    Tools across 9 knowledge layers.

  • 129

    Design principles, all canon, all cited.

  • Free

    Open source. One-command install. Nothing behind a login.

A Codex coding-agent session running Raven's taste-interview tool: multiple-choice Layout and Motion questions with the designer's answers captured inline — the MCP being used inside an agent, not read as documentation.
Side-by-side iPhone fitness app stats screen and a terminal showing RAVEN DESIGN EVALUATION listing four flagged issues to fix.
Same iPhone fitness stats screen with a terminal showing the code diff applying the four Raven-flagged fixes.
Raven Design open over a live article page: a Layers panel listing the page's element tree on the left, and a styles panel on the right showing the selected nav's computed layout values with two pending changes queued to send.
Raven Design at phone width: the layers and styles panels folded into a single bottom sheet with Layers, Assets, Styles, and Instructions tabs, one pending change, and a Send button, above the live page.
Raven's Decision Graph viewer: a node-link graph of design decisions with one selected, a Node details panel showing the decision's statement, rationale, scope and status, and a conflicts panel listing two competing decisions below.
The Fogline site built with Raven — a fog-wrapped coastal house near the beach under the serif headline "Where the fog line ends, the garden begins."
The landscape-architecture brief without Raven — a dense illustrated hero, "Cooler ground. Native gardens.", with full navigation and a thermal-model data card.
Same model, same brief. Without Raven, and the Fogline site built with it. Drag to compare.
Oddlot v2 3D workshop rebuild.
Oddlot v1 editorial page.
Oddlot — the editorial v1 page and the v2 3D workshop rebuild.
Nexus product page rebuilt under the bound taste profile.
Nexus product page before applying the bound taste profile.
Nexus — Taste Engine exhibit: a generic AI page and the same product rebuilt under the bound taste profile.
The fitness app's Activity rings in the iOS Simulator beside a terminal streaming a Raven audit session.