Catalyst evidence graph — MCP server, plugins and extensions

Catalyst is a curated evidence graph of what compounds, supplements, nutrients and foods have been shown to do in the human body. This repository connects it to the assistants and editors people already use. The server itself is hosted; everything here only tells a client where it is.

Server: https://catalystproject.ai/mcp — MCP over Streamable HTTP, read-only, no account, no key. Registry name: ai.catalystproject/evidence-graph Setup for every client, the tool list and limits: https://catalystproject.ai/connect

What an assistant gets

• Graded findings for a compound or an outcome. Every finding carries a grade from A (well established) to F (speculative), computed from the study behind it — never set by hand — plus the verbatim sentence it was drawn from, the paper, the population and dose, and a permalink to check it.
• Relations from reference databases (targets, pathways, reactions), each labelled as a hypothesis rather than a reported result.

A grade describes how strong the evidence is. It is not a recommendation, and nothing here is medical advice. No tool returns a product, a price or a link to buy anything, and no tool ranks what to take.

Install

Client	How
Claude (web, desktop)	Settings → Connectors → Add custom connector → https://catalystproject.ai/mcp
ChatGPT	Developer mode → add a custom app/connector with https://catalystproject.ai/mcp
Claude Code (plugin, adds the server and a skill for presenting grades)	/plugin marketplace add colorcatalyst/catalyst-mcp then /plugin install catalyst@catalyst
Claude Code (server only)	claude mcp add --transport http catalyst https://catalystproject.ai/mcp
VS Code / GitHub Copilot	The Catalyst Evidence Graph extension (VSIX on the releases page), the one-click link on /connect, or .vscode/mcp.json below
Cursor	One-click install, or ~/.cursor/mcp.json below
Gemini CLI	gemini extensions install https://github.com/colorcatalyst/catalyst-mcp
Anything else	the JSON below

{ "mcpServers": { "catalyst": { "url": "https://catalystproject.ai/mcp" } } }

VS Code's own file takes a slightly different shape:

{ "servers": { "catalyst": { "type": "http", "url": "https://catalystproject.ai/mcp" } } }

In this repository

Path	What it is
server.json	The entry in the official MCP registry
.claude-plugin/marketplace.json, plugins/catalyst/	A Claude Code plugin marketplace with one plugin: the server and a graded-evidence skill
gemini-extension.json, GEMINI.md	A Gemini CLI extension
vscode/	A VS Code extension that registers the server with Copilot's agent mode

Privacy

The server stores no queries and has no accounts. Rate limits count calls per minute against the client's name and a keyed hash of the network address, never the address itself. Full notice: https://catalystproject.ai/privacy.

Contact

Questions, or something an assistant got wrong from this graph: hello@catalystproject.ai

The code in this repository is MIT-licensed. The graph's content carries the terms on https://catalystproject.ai/terms and per-source licences on https://catalystproject.ai/attribution.