Use server.mjs from the linked issue. Configure it in an isolated Codex home:
[mcp_servers.rating-repro]
command = "node"
args = ["<absolute path to server.mjs>"]
omit_tools_from = ["code_mode", "deferred"]
[mcp_servers.rating-repro.env]
MCP_REPRO_STATE = "<disposable rating.json>"
Set the T3 Codex provider homePath to that isolated home. Preserve working authentication and provider routing. Start both checkouts with T3CODE_DEV_SEED=0 vp run dev.

Browser: Chromium, light theme, 1280x800 CSS viewport. Captures omit the bottom 160 pixels to exclude private runtime metadata. Sidebar and thread details are collapsed. The card replays its original show_rating result (unrated) when reopened; the persisted up value was verified separately before the final click.