A subagent is a separate helper that Claude Code starts to work on part of a task. Claude Code can now give a subagent the earlier user messages from the main session that it has marked as verified, placed ahead of the subagent's own messages. This only happens when the setting subagentInheritVerifiedTurns is true. If it is not set to true, nothing is passed on.
When the inherited messages are too long, they are cut down and a marker reading "earlier verified user turns, trimmed for length" shows where text was removed.
Why
A subagent can then see consent you gave earlier in the conversation. This matters in auto mode, where decisions about whether an action is allowed depend on what you have already approved.