How do you keep phi safe when a subagent runs on your network?
Subagents are lightweight processes that act on behalf of a larger service – for example, a job runner that pulls data from a database, a background worker that writes logs, or an AI‑assisted assistant that queries internal APIs. They are convenient because they can be started automatically, scale horizontally, and often run with a single set of credentials. The convenience, however, creates a blind spot: the subagent may read, transform, or forward phi without any human in the loop, and the organization frequently lacks visibility into exactly what was accessed.
Why subagents struggle with phi today
In many environments the default pattern is to embed a static database user or an IAM role directly into the subagent’s configuration. The subagent connects straight to the target system, and the connection is treated as a permanent “standing access” grant. Engineers rarely rotate those credentials, and audit logs are limited to the target’s own logging, which may not capture the exact query or the downstream data that left the system. When a subagent is compromised, an attacker inherits the same unrestricted read rights and can exfiltrate phi without triggering any alert.
The missing enforcement layer
What is needed is a runtime guard that sits between the subagent’s identity and the resource it talks to. The guard must enforce least‑privilege, require explicit approval for operations that touch phi, mask sensitive fields in responses, and record every session for later replay. The identity and token checks that happen at login – the setup – can tell us who the subagent is, but they cannot stop a malicious subagent from issuing a dangerous query once the connection is established. Without a dedicated data‑path, the request still reaches the database directly, leaving no place to apply inline masking or to capture a complete audit trail.
hoop.dev as the data‑path gateway for phi
Enter hoop.dev. It is a Layer 7 gateway that sits on the network edge and proxies every subagent connection to supported targets such as PostgreSQL, MySQL, or SSH. The setup – OIDC or SAML authentication, role‑based groups, and service‑account provisioning – decides which subagent may start a session. Once the session is initiated, the data path provided by hoop.dev becomes the only point where enforcement can happen.
hoop.dev masks phi in real time. When a query returns a column that contains a patient identifier or a health record number, the gateway can replace the value with a token or a redacted placeholder before it ever reaches the subagent’s process memory. This ensures that even a compromised subagent never sees the raw phi.