MCP Prompts and Resources: The Primitives You're...

Your user asks for a weekly sales report. The LLM has four tools available: querying the database, aggregating data, calculating trends, and formatting the output. It chains them together. Steps 1 and 2 go fine. Step 3 goes wrong: the LLM tries to calculate week-over-week percentage changes itself, mixes up which week is the baseline, and produces a report showing 340% growth in a category that actually declined. The user gets a polished, confident, completely wrong report. This isn't a contrive