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A portal is a permission-controlled view of a sheet. The portal creator defines which columns are visible, which are editable, and which rows are in scope. External parties — human clients, suppliers, or AI agents — access the portal via a token. Hidden columns are the permission boundary. They are never sent to portal viewers regardless of access level.

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Agent portal tokens

When for_agent: true is set on a portal draft, activation generates an HMAC-signed agent token alongside the human portal URL. Agents authenticate with this token via the Authorization: Bearer d2w_agent_* header to the shared-table-view endpoint.