Install Molecules in Claude Code
This server doesn't publish a package to a registry, so follow the install steps in its README. Once it runs, register it with Claude Code:
claude mcp add molecules -- <command to start the server>Frequently asked questions
What does the Molecules MCP server do?
Chemistry tools from NIST data: molar mass with uncertainties, isotope-distribution mass spectra and name-formula lookup, offline or with online fallback.
Is the Molecules MCP server free?
Yes, most likely. Open source and no paid account or API key is mentioned in the listing. Check the provider for current pricing.
Does Molecules run locally or remotely?
Local. Runs on your machine (stdio). You install it with npx, uvx, Docker or from source.
How do I add Molecules to Claude Code?
Follow the install steps in the project's README at https://github.com/laszlopere/mcp-molecules, then register it with "claude mcp add".
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