Map Trust Boundaries Before Tools
Identify trust boundaries and threat categories before granting an AI app tool access.
A model can choose a tool call, but your system must decide whether that call is allowed. Why trust boundaries matter AI apps blend human input, retrieved text, model reasoning, tool definitions, and system actions. Each boundary changes who controls the data and how much authority the data should have. STRIDE gives the questions Spoofing, tampering, repudiation, information disclosure, denial of service, and elevation of privilege are prompts for design review. They turn worry into testable questions. The AI-specific failure Teams often trust content because it is in the product. A retrieved document, uploaded email, or tool description can still…
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