CourseAgentic AI Engineer: The Complete Course · Module 4: Model Context Protocol · part 25 of 97

Part 25 · Module 4: Model Context Protocol

Lesson 3: When an MCP server works against you

19 min read·13 Oct 2026

Module 4 · Lesson 3 · About 50 minutes · Needs: Lesson 2 (an MCP server and a client) and Module 3's tools

The situation

Week 5. BrightCart's tools now run behind its own MCP server. Request R-1005 has no good answer: Tom Becker asks "Where is my TV?", and the agent cannot see the courier's tracking. Priya finds ParcelTrack, a free third-party MCP server for parcel tracking, and asks you to connect it. Sam wants to read its tool definitions first.

R-1005 needs tracking data, so Priya wants a second MCP server, written by someone else, beside BrightCart's own (blue is your system, amber is uncertain).

ParcelTrack is made up. The attacks are not: each follows a published pattern. You run each one against the returns desk, then the defence that stops it.

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