The plain-English version
A point where data or control crosses between different levels of authority or trust.
Why it matters
It identifies where validation, authorization, and careful interpretation are required.
Let’s make it click
A browser sends a record ID to a server that decides whether the caller can access it.
Vibe Bro’s heads-up
A value does not become trustworthy because it arrived from your own interface; callers can construct requests directly.
The docs behind it
Documentation links checked .
Editorial review · October 28, 2026
Supported: Trust boundaries concern differing authority; a request from an app's own interface is not automatically trusted.