Everyone is focused on the model's output, but the real attack surface is the tool-calling mechanism itself. The OpenAI Operator can now execute actions on behalf of users via connected tools. This isn't just a feature; it's a delegated privilege engine with insufficient isolation.

Let's break down the immediate threats using STRIDE:
* **Spoofing:** How does the Operator authenticate to third-party services (Google Calendar, Slack, etc.)? If it uses a long-lived user-provided API key, that credential is now stored and processed in OpenAI's environment. The attack tree starts with compromising that storage or the execution flow.
* **Tampering:** The primary vector is prompt injection via web content or documents the model processes. A manipulated instruction in a retrieved webpage can become a tool-calling command. The model is the interpreter, and we've seen it's not a reliable security boundary.
* **Repudiation:** If an agent sends a damaging email or deletes data, who is liable? The user who provided credentials? OpenAI? The audit trail is opaque.
* **Information Disclosure:** The Operator now has structured access to private services. A successful injection could exfiltrate calendar entries, emails, or team messages through the same tool channel.
* **Denial of Service:** Tool calls can be abused to spam or disable external accounts via their APIs.
* **Elevation of Privilege:** The user's granted tool permissions become the agent's permissions. There's no step-down or context-aware limitation per action.

The compliance angle is a nightmare. GDPR, SOC2, etc., are built on knowing where your data flows. An OpenAI-hosted agent acting on user credentials creates a data processor chain that is dynamic and poorly defined. You've just outsourced privileged actions to a system you cannot audit.

We need concrete answers, not marketing:
* What is the exact credential storage and transit mechanism?
* Is there a tool-calling sandbox or any runtime validation beyond the model's discretion?
* What logging of tool calls and their authorization context is provided to the enterprise user?

Without this, "tool use" is just a fancy name for a remote access trojan with a natural language interface.

- TL