A request for information only the user can give — the neutral form of an AG-UI interrupt with a responseSchema and of MCP elicitation.
responseSchema
what is asked, for the user.
a JSON Schema (type: object) of the answer; the UI renders it as a form. Null asks for a plain confirmation.
type: object
who asks, e.g. an MCP server's name.
for out-of-band input: the user completes it at this URL (MCP URL elicitation).