MCP server registries: are your controls keeping up with agents?

TL;DR: MCP server registries can improve discovery and approval, but they do not enforce policy on their own, according to NeuralTrust. GitHub's registry-only mode still relies on client-side matching that can be bypassed by editing configuration, so enterprises need a gateway and runtime enforcement, not a catalogue alone.

Editorial analysis by NHI Mgmt Group, based on content published by NeuralTrust: “MCP Server Registries for UK Enterprises”.

Key questions

Q: What breaks when MCP servers are added without a gateway?

A: Authentication, authorization, and audit responsibilities fragment across servers, which makes policy inconsistent and revocation slow.

Q: Why do client-side allowlists fail for MCP servers?

A: Client-side allowlists fail because they trust the device that is also running the agent.

Q: How should security teams govern MCP in enterprise environments?

A: Treat MCP as an identity and authorization problem first.

Practitioner guidance

• Separate approval from enforcement Keep the MCP registry as the source of approved servers, but enforce allow and deny decisions in a gateway or runtime policy layer that the agent cannot edit.
• Block agent writes to MCP configuration Protect registry URLs, server lists, and tool policy files as privileged configuration so developers and agents cannot change them from the workstation.
• Review every server on a fixed lifecycle Revalidate ownership, scope, and version on each release or exception, then remove stale entries from both the registry and the enforcement policy.

Bottom line: MCP registries are useful for approval and discovery, but they do not provide enforcement unless a separate runtime control blocks unapproved servers.

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