Athanor by arbastro
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How to use Athanor in ChatGPT

Add Athanor as a ChatGPT connector in developer mode: name, URL, no authentication. Then ask ChatGPT to name or check a structure.

Athanor's MCP server is free and needs no account. ChatGPT connects to it at:

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

Steps

  1. Open Settings > Apps & Connectors > Advanced settings and turn on Developer mode.
  2. Back in Apps & Connectors, choose Create.
  3. Name it Athanor, set MCP server URL to https://mcp-athanor.arbastro.com/mcp, and set Authentication to No authentication.
  4. Tick that you trust the connector, then choose Create.
  5. In a chat, open the + menu, choose Developer mode and turn on Athanor.
  6. Ask: Use Athanor to name CCO. It should call the name tool and answer ethanol.

The tools it gets are listed in MCP tools. If they do not show up, see MCP troubleshooting.

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