Build and render a UMG widget

Have an agent build a Widget Blueprint, check its layout against game-UI rules, and render it to a PNG you can look at, all without Play-In-Editor.

Before you start

Hayba is installed and your agent is connected. See Getting started.
You are in a scratch project, ideally under source control.
Review each external edit is off. This guide creates assets, which the exact review cannot approve on this version. See What can be approved.

Prompt

Make a pause menu Widget Blueprint at /Game/Hayba/UI/WBP_PauseMenu: a centred vertical box with a "Paused" title and three buttons, Resume, Settings and Quit. Compile and save it, validate it for PC, fix anything the validator reports, then render it to a PNG at 2x scale and show me.

What the agent does

ui_create_widget creates the Widget Blueprint with a root CanvasPanel. path is the folder and name the asset name.
ui_build_tree builds the whole subtree in one call: the box, the title and the buttons with their labels. If a node fails, the widgets made before it are kept and named in the error.
ui_set_slot_layout anchors and centres the box. ui_set_text_style sets fonts, sizes and colours.
ui_compile_widget compiles, with save_on_success to save.
ui_validate runs the rule catalogue on the real Slate layout: text overflow, room for translation, safe zones, touch target size, overlaps, contrast and gamepad focus.
ui_render_widget_to_png draws the widget to a PNG under Saved/Screenshots/Hayba and returns the image inline.

Things worth knowing:

Rendering needs no Play session. If coverage_percent is 0, the widget drew nothing; compile it first.
ui_layout_snapshot gives the measured geometry the validator judges, when you want numbers instead of a picture.
To make a button do something, expose it with ui_set_variable, compile, then bind its click with ui_bind_event.
ui_set_widget_properties stays out of the undo stack on purpose. The typed tools above are the better choice for common changes.
For fonts, pass a composite Font asset, not a Font Face. Unreal draws a raw Font Face as glyph tiles.

Check the result

Look at the PNG the agent returns. Ask it to render again after each fix.
Ask for the validator's findings by rule, and which it fixed.
Open WBP_PauseMenu in the UMG designer.