I Rolled Back My MCP Skills Experiment. Here's What I Learned

TL;DR

I introduced a SKILL layer while improving fare extraction in a MCP-based transit agent. After that, the agent stopped reliably using the MCP tool and started favoring web search, breaking real-time accuracy. I rolled back to a stable baseline, reintroduced SKILL more carefully, and restored MCP tool usage.

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Transparency Note: I used AI as an editor, not as the author. For this article, it helped refine the structure and improve the English grammar. The technical content, experiments, opinions, and conclusions are my own and were reviewed by me before publishing.