Building an MCP Calculator Server: From Zero to 100 Downloads/Week
Dev.to AI
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Generative AI
Five weeks ago, we published -team/mcp-calculators to npm. This week it crossed 94 weekly downloads - and we're watching it approach 100 in real time. Here's what we learned about building MCP tools that developers actually adopt. What Is an MCP Calculator Server? MCP (Model Context Protocol) lets AI assistants like Claude Desktop call external tools directly. Instead of asking an LLM to compute your TDEE or calculate mortgage payments (and hoping the math is right), you wire up a structured tool that guarantees correct outputs.