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Core
Multi-Tenancy and Isolation
When one AI system serves many customers (tenants), the cardinal rule is that no tenant can see another's data, ever. In RAG this means every retrieval is filtered by tenant so the vector search cannot return another tenant's documents; it extends to caches, logs, fine-tunes, and rate limits. The dangerous failure is a cross-tenant leak. Applied-AI interviews probe it because enterprise deployments are multi-tenant, and a leak between customers is a catastrophic, trust-destroying breach.
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TAUGHT IN THESE COURSES
This concept is a reference. These lessons put it in sequence, with what comes before and after it.
Agent Engineering·Trusting nothing the agent readsSign in14mDeciding what the agent may do, not what it may sayOnce you accept that an injection will eventually succeed, the only thing that bounds the damage is what the agent was permitted to do at that moment. Identity, scoping, and the actions that need a second signature.Agent Engineering·Trusting nothing the agent readsSign in13mWhat a sandbox buys, and the exit everyone leaves openAgents that write code or drive a browser need somewhere to run that is not your machine. What isolation actually contains, why the network is the exit that matters, and how to decide the blast radius before the run rather than after.
RELATED CONCEPTS
PRACTICE THIS IN REAL QUESTIONS
RAG & Agent System DesignDesign multi-tenancy and access control for a RAG system serving many enterprise customers.→AI Security, Privacy & GovernanceYour RAG system can surface documents a user shouldn't see. How do you enforce authorization in retrieval?→RAG & Agent System DesignHow do you let an AI agent execute code safely (sandboxing)?→AI Security, Privacy & GovernanceWhat is indirect prompt injection, and why is it so dangerous for RAG and agents?→AI Security, Privacy & GovernanceDesign data isolation for a multi-tenant AI SaaS so one customer's data can never leak to another.→AI Security, Privacy & GovernanceThreat-model an LLM application from scratch. What is the attack surface and how do you reason about it?→
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