MCP Server Registries for UK Enterprises

MCP server registries help UK enterprises catalogue approved Model Context Protocol tools with named owners, versions, scopes, and review dates, but they do not by themselves prevent agents or developers from using unapproved servers. GitHub documentation indicates that Copilot’s registry-only controls remain in public preview and can be bypassed by editing local configuration, while Visual Studio’s earlier preview emphasized discovery without enforceable allowlisting. The text argues that organisations should pair a private registry, which records approval status, with a gateway that enforces runtime access and logs tool calls outside user-controlled client settings. It cites DEFRA’s pilot-only approach, requiring approval for servers beyond six named options, and NCSC guidance on least privilege and meaningful human oversight as useful governance examples rather than universal requirements. Security incidents, including a reported Copilot configuration-file bypass vulnerability and the reported abuse of an MCP service by ransomware actors, illustrate risks from agents or attackers gaining broad tool access. Recommended practices include version pinning, OAuth, narrow scopes, restrictions on sensitive data access, approval and retirement workflows, red-team testing, drift detection, metrics for shadow tools and approval speed, and phased deployment with time-limited exceptions.

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