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Molecules

Verified Integration
Author: @laszlopere•Category: ServerApplication
GitHub Repository
JSON-RPC 2.0
Protocol Standard
Sub-second
Execution Latency
Active
Operational Status
Tags:#Claude#Search#Database#API#Git#AI#GitHub#Node.js

Client Configuration

— Connect Molecules to Claude Desktop or Cursor in seconds
{
  "mcpServers": {
    "molecules": {
      "command": "npx",
      "args": [
        "-y",
        "@modelcontextprotocol/server-molecules"
      ],
      "env": {}
    }
  }
}
Paste into ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%\Claude\claude_desktop_config.json (Windows).
Architecture & Capabilities

System Overview

Provides trustworthy computational chemistry tools for determining molecular weights, isotope distributions, and identifying compounds based on authoritative data.

Indexed Date

7/23/2026

License

Open Source

Protocol Layer

stdio / SSE RPC

Frequently Asked Questions

Architecture and operational details for Molecules

It leverages authoritative sources such as the NIST Atomic Weights and Isotopic Compositions database for element data. For compound lookup, it uses bundled offline databases (PubChem subset) and online fallbacks like PubChem, Wikidata, and EPA CompTox.

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