Brain of your company

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Question for anyone running AI agents/assistants across a company: when your AI needs to pull from multiple internal sources (docs, CRM, SQL, tickets), who decides *which* source it's allowed to use for a given question, and who enforces that?

Is that logic hardcoded per-agent right now, or does something actually manage it centrally? Trying to understand if this is a real gap or something everyone's already solved in a boring way I haven't seen.