laszlopere/mcp-molecules MCP server](https://glama.ai/mcp/servers/laszlopere/mcp-molecules/badges/score.svg)](https://glama.ai/mcp/servers/laszlopere/mcp-molecules) 🐍 🏠 ☁️ 🐧 🍎 - Chemistry toolbox computed from authoritative data: molecular weight / molar mass of any formula (nested groups, isotope labels, propagated NIST uncertainties, percent composition), isotope-distribution mass spectra (m/z peaks for a given charge), and name⇆formula lookup with isomer resolution. Element masses from the NIST Atomic Weights and Isotopic Compositions database; offline and deterministic, with an optional on-by-default online fallback (PubChem/Wikidata/EPA CompTox) that can be disabled. uvx mcp-molecules.
Getting started
Add mcp-molecules to your MCP-capable client — Claude Code, Cursor, Codex, and others — by following the setup at the source, which documents the exact command, configuration, and any required API keys.
