The evidence register inside your AI assistant

mechoulam opens its reviewed register on the evidence for cannabis as medicine through a public interface. Assistants such as ChatGPT and Claude can query the entries directly instead of writing them from memory. Every answer carries the address of the page the statement comes from, so a reader can look it up.

The interface follows the Model Context Protocol, MCP for short, an open standard that assistants use to connect outside data sources. It only reads, it never writes.

What is the address?

https://mechoulam.de/mcp

There is no sign-in and you need no key. Access is free of charge.

How do I set it up in ChatGPT?

ChatGPT allows custom MCP connections on the Pro, Business and Enterprise/Edu plans only. A Plus plan cannot create one, as of August 2026. Neither can the mobile app, so the web version is the only route.

Open chatgpt.com in a browser. Go to Settings, then Apps, then Advanced settings, and turn on developer mode. A Create entry then appears under Apps. On a Business, Enterprise or Edu plan an administrator releases developer mode first.

Enter https://mechoulam.de/mcp as the address and pick "no authentication". A click on "Scan tools" checks the connection, then comes Create. In a new conversation, pick the access from the apps menu. Deep Research can use the access as well.

How do I set it up in Claude?

Claude keeps the same connectors section in its settings. Add a custom connector with the same address. In Claude Code one command does it: claude mcp add --transport http mechoulam https://mechoulam.de/mcp.

What does the access provide?

The assistant queries a keyword with search and receives a list of hits, each with a title and an address. With fetch it reads the full text behind one hit.

Three further tools serve a program that wants to ask more precisely. list_indications names every indication with its GRADE rating, get_indication returns the summary for one of them, and get_study gives the record of a single study by its DOI.

The access exposes only entries a human has reviewed and cleared. Drafts stay out. How an entry comes about is described on the Methodology page.

Does it answer in German as well?

Yes. A German question gets a German answer citing the German page, an English question gets an English answer citing mechoulam.de/en/…. A program can also set the language explicitly.

What does it not do?

It accepts no data and changes nothing. It knows no accounts and no personal data. It states no dosages and no ways to obtain a product, and it names no preparations.

Where is the server listed?

The server stands in the official MCP registry under the name de.mechoulam/cannabis-evidence. Directories that draw their listings from there carry it as well.