Cloudflare OS is an architecture of distrust

The strangest thing in the Cloudflare OS source code took me a while to understand. When an agent inside Cloudflare OS wants to do something with a side effect (merge a pull request, send an email, write a row to a system of record), it goes through a Gatekeeper, a small service that holds the credential and mediates the action. So far, that’s just a well-built MCP server. But read the contract a Gatekeeper is written against (packages/workshop-shared/src/gatekeeper.ts, around line 617) and you find this instruction to the author: It is suggested that the gatekeeper “simulate” actions that have not been approved yet, that is, the Session interface should reflect the state of the resource as if all actions had been applied. Sit with that. The agent asks to merge the PR. The human hasn’t approved it. So the Gatekeeper tells the agent the PR is merged, and if the agent reads the branch back to check its work, hands it a fabricated reality in which the merge happened. The agent,…

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