WebMCP is off in this browser. The planner works without it, but the half this project exists to show, an agent driving the canvas, needs it switched on. It takes about thirty seconds. Check my browser →

Paste chrome://flags/#enable-webmcp-testing into the address bar. In Edge use edge://flags/#enable-webmcp-testing. Browsers block a page from linking there, so it has to be pasted.
Set WebMCP for testing to Enabled.
Restart the browser, then come back to this page. This bar disappears when it worked.

ChatGPT's in-app browser needs no flag. Verified on Chrome 152 and on Edge.

Plan · looking down on the turn

Drag to move. Scroll to rotate.

The shaft · drag to orbit, scroll to zoom

Orbit to look around. Carry to move it. Arrows or WASD to nudge.

Elbow Room

Before you buy the couch, find out whether it can get up the stairs. A basement winder turn, measured with a tape.

Which staircase

No site tools in this browser. The app works, but the agent half needs WebMCP. Use ChatGPT's desktop browser, or Chrome or Edge with chrome://flags/#enable-webmcp-testing enabled and restarted.

Measure your own staircase from a photo or video →

What are you carrying

length in

depth in

height in

Ask your agent

“Can my couch get up these stairs?”
“Show me where it jams.”
“How long could a sofa be at 36 inches deep?”
“Take the door off and try again.”
“What have you not actually measured?”