How We Built Harvey’s Connector Library
Original excerpt
An MCP member's server is operated by the vendor, so the review has to judge a system someone else runs, and it gets an extra layer of admission. The vendor submits its full tool list and capability scope, hosting and auth details, data-processing regions, and test credentials, and the security team reviews the tools one by one, deciding for each whether it is approved and assigning its risk level.
Context
A native member is a wrapper we wrote around the vendor's API, and it goes through the same security review: which of the vendor's APIs we call and which scopes we request are what the security team signs off on. This way, approval is a hard gate before engineering integration begins. Those decisions land in a registry that ships with the code: a structured URL matcher, the vendor's full advertised tool list, the subset that may be invoked, and a hand-written risk and capability annotation for each.