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An MCP server you already approved changes a tool's description. What breaks, and how do you defend against it?

Approval happens once, at install. The tool description is fetched every session and goes straight into the model's context, so a server that behaves for a week and then rewrites a description has a live injection channel you already trusted.

Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.

Approval happens once, at install. The tool description is fetched every session and goes straight into the model's context, so a server that behaves for a week and then rewrites a description has a live injection channel you already trusted.

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