𝗧𝗿𝘂𝘀𝘁 𝗕𝗼𝘂𝗻𝗱𝗮𝗿𝘆 | 𝗧𝗵𝗲 𝗜𝗻𝘁𝗲𝗿𝗳𝗮𝗰𝗲 𝗜𝘀 𝗡𝗼𝘁 𝘁𝗵𝗲 𝗦𝗲𝗰𝘂𝗿𝗶𝘁𝘆 𝗕𝗼𝘂𝗻𝗱𝗮𝗿𝘆 | 𝗥.𝗔.𝗛.𝗦.𝗜. 𝗙𝗿𝗮𝗺𝗲𝘄𝗼𝗿𝗸™

𝗧𝗵𝗲 𝗶𝗻𝘁𝗲𝗿𝗳𝗮𝗰𝗲 𝗶𝘀 𝗻𝗼𝘁 𝘁𝗵𝗲 𝘀𝗲𝗰𝘂𝗿𝗶𝘁𝘆 𝗯𝗼𝘂𝗻𝗱𝗮𝗿𝘆.

An agent appears on a SharePoint page. For the documented Copilot Studio SharePoint knowledge-source option, content is trimmed to the signed-in user’s permissions. That is a legitimate control.

Now suppose the agent invokes a tool connected to another business system. Which identity does that system evaluate? Which permission authorizes its action? The page cannot answer either question.

𝗙𝗼𝘂𝗿 𝗯𝗼𝘂𝗻𝗱𝗮𝗿𝗶𝗲𝘀 𝘁𝗼 𝗺𝗮𝗽:

• Presentation: Where did the interaction appear?
• Identity: Who or what acted?
• Authorization: What could that principal do?
• Trust: Where did data, authority or execution cross domains?

𝗖𝗵𝗲𝗰𝗸 𝘁𝗵𝗲 𝗰𝗼𝗻𝗻𝗲𝗰𝘁𝗶𝗼𝗻.

A Copilot Studio tool can require user authentication or use credentials supplied for the agent to act on the user’s behalf. Whose authority does the destination evaluate? What operation can it perform, and where can it be blocked?

Environments, Entra agent identities, data policies, tool authentication and destination permissions are distinct governance layers. Shared interface does not imply shared trust.

Proposed R.A.H.S.I. Trust-Boundary Map records the surface; user and agent identities; environment; knowledge and tools; connector identity and authentication mode; APIs and destinations; data classification; policy, network and approval boundaries; actions; audit sources; owner; and risks.

It is an architecture artifact, not a native product object.

Zero Trust must follow execution, not pixels. For Reconstructable AI™, preserve evidence of the initiating user, acting identity, connection, permission, policy decision, destination and action.

Article #42 asked, “What happened after the click?” Article #43 asks, “Where did identity, authorization and trust change?”

If the interface disappeared tomorrow, would the security architecture still make sense?

The visible interface is the front door. The trust boundary is the entire building. The interface is not the security boundary.

| R.A.H.S.I. Framework™

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Map one agent’s acting identities, connections and destination permissions before treating its host page as its security model.

🛡️ Article Link | https://www.aakashrahsi.online/post/trust-boundary

Trust Boundary | The Interface Is Not the Security Boundary | R.A.H.S.I. Framework™

A friendly AI interface can hide multiple trust boundaries. Strong governance requires explicit identity, permissions, data controls, tools, environments and policy enforcement.

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