MiddlewareError

The tool call that dispatched this subagent, as { type: "toolCall", tool_call_id }, or undefined when the originating tool call could not be recovered (e.g. it was not triggered from a tool).

The message sent to the model explaining why the action was rejected.

The type or name of action being requested (e.g., "add_numbers").

Check if the error is a MiddlewareError.

Wrap an error in a MiddlewareError, unless it's a GraphBubbleUp error (like GraphInterrupt) which should propagate unchanged.