"183 Local Tools, Zero Guardrails: What Local MCP Gets Wrong About 'Privacy'"

Short summary

Local MCP tools claim privacy because data stays on-device, but 'local = safe' masks real risks: unaudited agents with simultaneous read/write access across iMessage, Teams, OneDrive enable prompt-injection attacks. Removing OAuth/scoping/audit trails eliminates enterprise visibility and revocation—a shadow-IT problem at scale.

• •Local execution doesn't prevent prompt-injection attacks or limit cross-app access—threat model doesn't improve with data residency
• •Removing OAuth/scoping/audit trails eliminates access control, not middlemen—enterprise security loses visibility and revocation paths
• •Industry lacks agreed standards for agent least-privilege; vendors competing on connector-count aren't incentivized to solve this first

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