Athanor by arbastro
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Connect your AI assistant

Add the server address https://mcp-athanor.arbastro.com/mcp to your assistant as a remote MCP server or connector, turn it on, and ask it to name CCO. There is nothing to install and no key.

The Model Context Protocol (MCP) is a standard way for an AI assistant to use outside tools. Once you connect Athanor's MCP server, your assistant can name structures, convert them between formats, draw them in a journal style, check them for mistakes and look compounds up in Athanor's library.

Note

The server is free and needs no account. Every tool only reads the structure you give it and returns a result; nothing is stored.

Before you start

You need an AI assistant that can connect to a remote MCP server. Any of these works:

  • ChatGPT on a Plus, Pro or Business plan, with developer mode turned on (step 1 shows where).
  • Claude on claude.ai or the Claude desktop app.
  • Claude Code, Codex CLI or Gemini CLI in a terminal.
  • Cursor or VS Code with GitHub Copilot.

There is nothing to install and no key to copy. Every client connects to the same address:

https://mcp-athanor.arbastro.com/mcp

Step 1: Add the server to your client

Choose your client, then follow its instructions.

Client

Configure Claude Code to connect to Athanor.

Installation

Add the MCP server using the command line:

claude mcp add --transport http athanor https://mcp-athanor.arbastro.com/mcp

This adds it to the current project. Add --scope user to use it in every project.

Alternatively, add this configuration to .mcp.json:

.mcp.json
{
  "mcpServers": {
    "athanor": {
      "type": "http",
      "url": "https://mcp-athanor.arbastro.com/mcp"
    }
  }
}

Step 2: Turn it on

Most assistants turn connectors on per chat. In ChatGPT, open the + menu, choose Developer mode and turn on Athanor. In Claude, open the tools menu under the message box and turn on Athanor. Claude Code, Codex, Gemini CLI, Cursor and VS Code pick it up the next time you start them.

Step 3: Check that it works

Ask your assistant:

Use Athanor to name CCO.

It should call Athanor's name tool and answer ethanol.

After this step you should have: an assistant that lists Athanor's tools and can call them.

Then try something bigger, such as "Use Athanor to name CC(=O)Oc1ccccc1C(=O)O and draw it."

Troubleshooting

See MCP troubleshooting.

Next steps

MCP serverToolsThe server has 20 tools. Engine tools such as convert, name, properties, depict, check and screen take a structure and answer. Document tools create an Athanor document, edit it atom by atom, and render or export it.MCP serverMCP troubleshootingMost problems are a connector that is not turned on for the chat, a terminal client that was not restarted or does not trust the folder, or the limit of 60 calls a minute from one address.

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Last updated Nov 12, 2026