# X_UI_INTERACT_LEFT_APP

## Means

a `ui.interact` step navigated off the dev server origin

## Typical cause

after a step, `page.url()`'s origin is not the dev server's — an external link clicked, an OAuth redirect followed. A same-origin navigation is allowed and reported `navigated: true` with the new URL; another origin is a page the picture cannot be of, and the step list stops there. `meta.step` and `meta.url` name the step and where it went

## Fix

`x routes --json`, then resend `ui.interact` with steps that stay on one of its paths

[MCP and AI](/error-codes#mcp-and-ai)