shadow-testandClaude Opus 5
f68d9c5788
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The pane could only ever watch a browser something else had published. This opens one: a URL and a viewport, launched inside the container and bound so the pane picks it up. Two uses, one action — a sign-in page, where the callback listener is *in* the container and the loop closes with no host round trip and no auth bridge, and a dev server on container loopback, which is how you watch a UI Claude is building. Reachable from both places the question comes up: "Open a page…" in the Browser tab, and an "In container" button on the terminal's URL prompt. Verified first, because it decided the design: a second client cannot join a bound browser. `chromium.connect()` against the published endpoint times out in every URL form (`ws+unix://…`, with and without the trailing path) — that socket speaks the dashboard's own transport, not the public connect protocol. Whoever launches is therefore the only process that can drive, so the helper is resident and holds the handle, and live resize applies to pages we opened and never to `@playwright/mcp`'s. Those take `--viewport-size` / `PLAYWRIGHT_MCP_VIEWPORT_SIZE` at launch, which the docs now say. The viewport is the interesting half. Resizing the *window* does nothing to the page — the viewer is a CDP screencast, so a bigger window is the same pixels drawn larger, which is why pages have been looking like they were rendered small. `page.setViewportSize()` genuinely reflows: measured against a `@media (max-width: 900px)` rule, it fires at 800×600 and clears at 1440×900. Match-window mode pushes the pop-out's settled size into it, debounced by generation counter because a drag emits `Resized` continuously and each one costs a container exec. Control is a polled JSON file in /tmp: no port, no second listener, nothing added to the proxy's surface, and URLs travel as argv to `node` so no shell ever parses one. A re-open with a helper already up navigates instead of relaunching — otherwise the second page would throw away the session the first one just signed into. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>