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MCP tool descriptions can contain hidden instructions that manipulate AI agent behavior when tools are enumerated. Malicious MCP servers can embed prompt injection payloads in tool descriptions, causing agents to exfiltrate data or execute unintended actions.
When an MCP client enumerates available tools, tool descriptions are injected into the model context. A malicious server can craft descriptions containing instructions that override the agent system prompt, potentially causing data exfiltration, unauthorized actions, or tool poisoning attacks.
Review and audit MCP server tool descriptions before connecting. Implement tool description sanitization. Use allowlisting for approved MCP servers. Monitor agent behavior for anomalous tool usage patterns.