Agent Access Questions on the Enterprise Security Questionnaire, Answered

Enterprise security questionnaires for MCP servers increasingly assess specific, externally verifiable controls rather than general security claims, and this guide outlines how vendors can answer 12 common questions under the MCP 2026-07-28 revision. It emphasizes publishing RFC 9728 protected resource metadata, returning proper OAuth challenge and insufficient-scope responses, validating token audiences, never forwarding inbound client tokens to upstream APIs, and documenting supported protocol revisions and client-registration methods, with Client ID Metadata Documents favored over deprecated Dynamic Client Registration. Additional topics include least-privilege scopes and step-up authorization, human confirmation for consequential tools, server-side authorization rather than reliance on tool annotations, protection of sensitive values from HTTP headers, per-call authorization for state handles, and agent offboarding tied to the employment status of a human owner through SCIM. The guide also recommends detailed audit logging that distinguishes users from agents, current SDK versions addressing known vulnerabilities, and attaching reproducible evidence such as endpoint URLs, curl outputs, CI tests, configuration metadata, and token-revocation tests. It argues that audience validation and agent offboarding are especially important because they are frequently deficient and can be directly tested by reviewers or auditors.

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