Athanor by arbastro
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How to use Athanor in Codex CLI

Two lines in ~/.codex/config.toml give Codex CLI Athanor's chemistry tools. Restart Codex and ask it to name a structure.

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

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

Steps

  1. Add this to ~/.codex/config.toml:

    [mcp_servers.athanor]
url = "https://mcp-athanor.arbastro.com/mcp"

  2. Start Codex again so it reads the file.

  3. 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 serverConnect your AI assistantAdd 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.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