You'll notice
New warning text flags tool calls written as plain text that were never actually executed
What
Two new fixed messages were added: one warns that tool calls or tool output appearing in a response's text were not actually executed and may not reflect real files or data, and another notes that when an answer merely writes out tool calls as text, that content is omitted because nothing was actually run.
Why
This helps prevent confusion in cases where a response describes a tool call in plain text rather than actually invoking it, making clear that the described action didn't happen and its output shouldn't be trusted.