Building a 100% Read-Only MCP Server for a B2B Growth Case: Architecture, Decisions, and Why Tests Matter More Than Features

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This post documents the technical decisions behind growth-copilots-mcp, an MCP server I built for a B2B insurance growth case — designed from the ground up to answer business questions, never to write them. If you want an AI system to never decide, on its own, to modify business data, the strongest guarantee isn't "telling it not to" — it's making sure the code doesn't allow it. 5 V1 tools: direct queries — portfolio status, campaign performance, historical risk quality. This server doesn't generate content, doesn't decide what to publish, and has no tool that writes to any system.

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