Issue with MCP in Agent

Hi All,

This is my 1st venture in building an AI agent / copilot although I'm pretty technical. I may well have missed some basic knowledge about building agents as I have started with a project that has a specific end goal.

Anyway.. my agent is purely to use an MCP server, it has no other knowledge or tools at all. I have configured the tool and connection to the MCP server in the agent and when I test, it answers the first question no problem and I can tell (I know for sure as I can see if using the mcp and the data returned is correct) that it uses the MCP. any questions after that though.. it just seems to ignore the mcp and plead ignorance, give me tips on how to retrieve the data I need in other "generic" ways but just plays dumb. I leave it alone for an hour, try again.. it might answer the 1st question right again... then back to being dumb.

What am I missing here?