There is no attacker in this situation. In order for the LLM to emit sensitive data publicly, you yourself need to explicitly tell the LLM to evaluate arbitrary third-party input directly, with access to an MCP server you've explicitly defined and configured to have privileged access to your own private information, and then take the output of that response and publish it to a public third-party system without oversight or control.

> Any time you use an LLM with tools that might be exposed to malicious instructions from attackers (e.g. reading issues in a public repo, looking in your email inbox etc) you need to assume that an attacker could trigger ANY of the tools available to the LLM.

Whether or not a given tool can be exposed to unverified input from untrusted third-parties is determined by you, not someone else. An attacker can only send you stuff, they can't magically force that stuff to be triggered/processed without your consent.