MCP authorization: governing tool calls beyond OAuth

MCP OAuth scopes and valid access tokens can authorize an agent to invoke a tool such as sending email, but they do not determine whether the specific request content, recipient, or purpose complies with organizational policy. Effective enforcement therefore requires an MCP server or gateway to evaluate each complete tools/call request, including declared intent, trusted contextual records, and the exact arguments, before any provider action occurs. The request should be validated and frozen so that the recipient and content executed are identical to those evaluated, while denials, pending approvals, policy failures, and expired tokens prevent sending; approved actions should follow a separately validated approval path. Provider credentials should remain server-side rather than using the client’s MCP token, and testing should use recording stubs and test mailboxes to confirm that prohibited content, authorization failures, and policy timeouts result in no provider call. WorkOS Airlock is presented as an early-access authorization layer intended to apply such policy decisions to governed agent tool calls.

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