Ask User lets agents pause and ask you questions mid-run

In the UI: an agent with the ask_user capability can stop and ask one to four structured questions instead of guessing. The chat shows a card with choice options, a free-form text field, or a secret field; answering resumes the turn. An unanswered choice falls back to the option the model recommended, while text and secret questions are declined. A secret answer never enters the event log or the agent’s context. The default chat harnesses enable it.

In code: implement the AskUser trait to answer questions from your own interface when you embed the Framework.

See Ask User and Answer an agent’s questions. PRs #3735, #3738, #3747, #3757, #3790.