# R30 — Mirror failure continuation

Environment: fs-50; Linux 6.8.0-117-generic x86_64; Node v26.12.1; Playwright 1.60.0; Chrome Headless Shell 157.0.8103.38; isolated dev:server, T3CODE_DEV_SEED=0, fresh per-checkout SQLite; synthetic Fx fixture; RPC/MCP over loopback; UTC timestamps.

Scripted interaction (same inputs on both revisions; generated ids differ): After releasing A and draining earlier jobs, inject one dark rendering failure on B; remove gate, apply light on B and resize D.

What differed: Both log the rendering failure and continue applying later settings. This preserves failure handling while the head no longer awaits each tab job in the event stream.

## C5 steps and timestamps

Before step times (UTC):

```jsonl
{"time":"2026-11-10T11:39:21.061Z","tool":"preview_open","caller":0,"args":{"reuseExistingTab":false,"open":false}}
{"time":"2026-11-10T11:39:21.141Z","tool":"preview_open","caller":0,"args":{"reuseExistingTab":false,"open":false}}
{"time":"2026-11-10T11:39:21.215Z","tool":"preview_open","caller":0,"args":{"reuseExistingTab":false,"open":false}}
{"time":"2026-11-10T11:39:21.288Z","tool":"preview_navigate","caller":0,"args":{"tabId":"tab_e_bea12b60-c14f-4580-bb58-2b38123bd480","url":"http://127.0.0.1:18766/fixture"}}
{"time":"2026-11-10T11:39:21.421Z","tool":"preview_set_appearance","caller":0,"args":{"tabId":"tab_d_bea12b60-c14f-4580-bb58-2b38123bd480","colorScheme":"dark"}}
{"time":"2026-11-10T11:39:38.940Z","event":"RPC.send","method":"preview.adjust","payload":{"threadId":"f41bc889-9c75-40ee-b7a0-6866bd924e3e","tabId":"tab_d_bea12b60-c14f-4580-bb58-2b38123bd480","colorScheme":"light"}}
{"time":"2026-11-10T11:39:42.055Z","event":"gate.release","tabId":"tab_e_bea12b60-c14f-4580-bb58-2b38123bd480","mode":"resolve"}
{"time":"2026-11-10T11:39:43.271Z","event":"release.stuck.A"}
{"time":"2026-11-10T11:39:43.272Z","event":"gate.release","tabId":"tab_d_bea12b60-c14f-4580-bb58-2b38123bd480","mode":"resolve"}
{"time":"2026-11-10T11:39:45.298Z","event":"RPC.send","method":"preview.adjust","payload":{"threadId":"f41bc889-9c75-40ee-b7a0-6866bd924e3e","tabId":"tab_e_bea12b60-c14f-4580-bb58-2b38123bd480","colorScheme":"dark"}}
{"time":"2026-11-10T11:39:45.602Z","event":"RPC.send","method":"preview.adjust","payload":{"threadId":"f41bc889-9c75-40ee-b7a0-6866bd924e3e","tabId":"tab_e_bea12b60-c14f-4580-bb58-2b38123bd480","colorScheme":"light"}}
{"time":"2026-11-10T11:39:45.606Z","event":"RPC.send","method":"preview.resize","payload":{"threadId":"f41bc889-9c75-40ee-b7a0-6866bd924e3e","tabId":"tab_g_bea12b60-c14f-4580-bb58-2b38123bd480","viewport":{"_tag":"freeform","width":650,"height":450}}}
{"time":"2026-11-10T11:39:46.020Z","tool":"preview_status","caller":0,"args":{"tabId":"tab_e_bea12b60-c14f-4580-bb58-2b38123bd480"}}
{"time":"2026-11-10T11:39:46.033Z","tool":"preview_evaluate","caller":0,"args":{"tabId":"tab_e_bea12b60-c14f-4580-bb58-2b38123bd480","expression":"({width:innerWidth,height:innerHeight,cookie:document.cookie,loads:document.querySelector(\"#loads\").textContent})"}}
{"time":"2026-11-10T11:39:46.054Z","tool":"preview_status","caller":0,"args":{"tabId":"tab_e_bea12b60-c14f-4580-bb58-2b38123bd480"}}
{"time":"2026-11-10T11:39:46.063Z","tool":"t3_preview_close","caller":0,"args":{"tabId":"tab_d_bea12b60-c14f-4580-bb58-2b38123bd480"}}
{"time":"2026-11-10T11:39:46.076Z","tool":"t3_preview_close","caller":0,"args":{"tabId":"tab_e_bea12b60-c14f-4580-bb58-2b38123bd480"}}
{"time":"2026-11-10T11:39:46.089Z","event":"RPC.send","method":"preview.close","payload":{"threadId":"f41bc889-9c75-40ee-b7a0-6866bd924e3e","tabId":"tab_g_bea12b60-c14f-4580-bb58-2b38123bd480"}}
```

After step times (UTC):

```jsonl
{"time":"2026-11-10T11:36:55.056Z","tool":"preview_open","caller":0,"args":{"reuseExistingTab":false,"open":false}}
{"time":"2026-11-10T11:36:55.139Z","tool":"preview_open","caller":0,"args":{"reuseExistingTab":false,"open":false}}
{"time":"2026-11-10T11:36:55.197Z","tool":"preview_open","caller":0,"args":{"reuseExistingTab":false,"open":false}}
{"time":"2026-11-10T11:36:55.262Z","tool":"preview_navigate","caller":0,"args":{"tabId":"tab_d_bd9d2d9d-727d-4676-b1e8-9554a31f1406","url":"http://127.0.0.1:18766/fixture"}}
{"time":"2026-11-10T11:36:55.471Z","tool":"preview_set_appearance","caller":0,"args":{"tabId":"tab_c_bd9d2d9d-727d-4676-b1e8-9554a31f1406","colorScheme":"dark"}}
{"time":"2026-11-10T11:37:12.494Z","event":"RPC.send","method":"preview.adjust","payload":{"threadId":"100ee364-0c8a-4d22-8790-3614885b473c","tabId":"tab_c_bd9d2d9d-727d-4676-b1e8-9554a31f1406","colorScheme":"light"}}
{"time":"2026-11-10T11:37:15.634Z","event":"gate.release","tabId":"tab_d_bd9d2d9d-727d-4676-b1e8-9554a31f1406","mode":"resolve"}
{"time":"2026-11-10T11:37:16.850Z","event":"release.stuck.A"}
{"time":"2026-11-10T11:37:16.850Z","event":"gate.release","tabId":"tab_c_bd9d2d9d-727d-4676-b1e8-9554a31f1406","mode":"resolve"}
{"time":"2026-11-10T11:37:18.876Z","event":"RPC.send","method":"preview.adjust","payload":{"threadId":"100ee364-0c8a-4d22-8790-3614885b473c","tabId":"tab_d_bd9d2d9d-727d-4676-b1e8-9554a31f1406","colorScheme":"dark"}}
{"time":"2026-11-10T11:37:19.183Z","event":"RPC.send","method":"preview.adjust","payload":{"threadId":"100ee364-0c8a-4d22-8790-3614885b473c","tabId":"tab_d_bd9d2d9d-727d-4676-b1e8-9554a31f1406","colorScheme":"light"}}
{"time":"2026-11-10T11:37:19.191Z","event":"RPC.send","method":"preview.resize","payload":{"threadId":"100ee364-0c8a-4d22-8790-3614885b473c","tabId":"tab_f_bd9d2d9d-727d-4676-b1e8-9554a31f1406","viewport":{"_tag":"freeform","width":650,"height":450}}}
{"time":"2026-11-10T11:37:19.596Z","tool":"preview_status","caller":0,"args":{"tabId":"tab_d_bd9d2d9d-727d-4676-b1e8-9554a31f1406"}}
{"time":"2026-11-10T11:37:19.608Z","tool":"preview_evaluate","caller":0,"args":{"tabId":"tab_d_bd9d2d9d-727d-4676-b1e8-9554a31f1406","expression":"({width:innerWidth,height:innerHeight,cookie:document.cookie,loads:document.querySelector(\"#loads\").textContent})"}}
{"time":"2026-11-10T11:37:19.624Z","tool":"preview_status","caller":0,"args":{"tabId":"tab_d_bd9d2d9d-727d-4676-b1e8-9554a31f1406"}}
{"time":"2026-11-10T11:37:19.640Z","tool":"t3_preview_close","caller":0,"args":{"tabId":"tab_c_bd9d2d9d-727d-4676-b1e8-9554a31f1406"}}
{"time":"2026-11-10T11:37:19.656Z","tool":"t3_preview_close","caller":0,"args":{"tabId":"tab_d_bd9d2d9d-727d-4676-b1e8-9554a31f1406"}}
{"time":"2026-11-10T11:37:19.670Z","event":"RPC.send","method":"preview.close","payload":{"threadId":"100ee364-0c8a-4d22-8790-3614885b473c","tabId":"tab_f_bd9d2d9d-727d-4676-b1e8-9554a31f1406"}}
```

<a id="before"></a>
## Before — C5

SHA: [fa2f4ff2a2](https://github.com/pingdotgg/t3code/commit/fa2f4ff2a2bac5ac92e07749f6b83b0003d642a0)

Agent-visible results (status/list fields selected; error text verbatim):

```jsonl
{"time":"2026-11-10T11:39:21.140Z","tool":"preview_open","caller":0,"result":{"isError":false,"selectedStatusFields":{"available":true,"tabId":"tab_d_bea12b60-c14f-4580-bb58-2b38123bd480","url":null,"loading":false,"control":{"owner":"agent","ownedByCaller":true,"generation":0},"dialog":null,"viewportSetting":{"_tag":"fill"},"viewport":{"width":1280,"height":800},"tabs":[{"tabId":"tab_d_bea12b60-c14f-4580-bb58-2b38123bd480","owner":"agent","ownedByCaller":true}]}}}
{"time":"2026-11-10T11:39:21.215Z","tool":"preview_open","caller":0,"result":{"isError":false,"selectedStatusFields":{"available":true,"tabId":"tab_e_bea12b60-c14f-4580-bb58-2b38123bd480","url":null,"loading":false,"control":{"owner":"agent","ownedByCaller":true,"generation":0},"dialog":null,"viewportSetting":{"_tag":"fill"},"viewport":{"width":1280,"height":800},"tabs":[{"tabId":"tab_d_bea12b60-c14f-4580-bb58-2b38123bd480","owner":"agent","ownedByCaller":true},{"tabId":"tab_e_bea12b60-c14f-4580-bb58-2b38123bd480","owner":"agent","ownedByCaller":true}]}}}
{"time":"2026-11-10T11:39:21.288Z","tool":"preview_open","caller":0,"result":{"isError":false,"selectedStatusFields":{"available":true,"tabId":"tab_f_bea12b60-c14f-4580-bb58-2b38123bd480","url":null,"loading":false,"control":{"owner":"agent","ownedByCaller":true,"generation":0},"dialog":null,"viewportSetting":{"_tag":"fill"},"viewport":{"width":1280,"height":800},"tabs":[{"tabId":"tab_d_bea12b60-c14f-4580-bb58-2b38123bd480","owner":"agent","ownedByCaller":true},{"tabId":"tab_e_bea12b60-c14f-4580-bb58-2b38123bd480","owner":"agent","ownedByCaller":true},{"tabId":"tab_f_bea12b60-c14f-4580-bb58-2b38123bd480","owner":"agent","ownedByCaller":true}]}}}
{"time":"2026-11-10T11:39:21.420Z","tool":"preview_navigate","caller":0,"result":{"isError":false,"selectedStatusFields":{"available":true,"tabId":"tab_e_bea12b60-c14f-4580-bb58-2b38123bd480","url":"http://127.0.0.1:18766/fixture","loading":false,"control":{"owner":"agent","ownedByCaller":true,"generation":0},"dialog":null,"viewportSetting":{"_tag":"fill"},"viewport":{"width":1280,"height":800},"tabs":[{"tabId":"tab_d_bea12b60-c14f-4580-bb58-2b38123bd480","owner":"agent","ownedByCaller":true},{"tabId":"tab_e_bea12b60-c14f-4580-bb58-2b38123bd480","owner":"agent","ownedByCaller":true},{"tabId":"tab_f_bea12b60-c14f-4580-bb58-2b38123bd480","owner":"agent","ownedByCaller":true}]}}}
{"time":"2026-11-10T11:39:37.438Z","tool":"preview_set_appearance","caller":0,"result":{"content":[{"type":"text","text":"Preview automation setColorScheme timed out after 15000ms."}],"isError":true}}
{"time":"2026-11-10T11:39:46.033Z","tool":"preview_status","caller":0,"result":{"isError":false,"selectedStatusFields":{"available":true,"tabId":"tab_e_bea12b60-c14f-4580-bb58-2b38123bd480","url":"http://127.0.0.1:18766/fixture","loading":false,"control":{"owner":"agent","ownedByCaller":true,"generation":0},"dialog":null,"viewportSetting":{"_tag":"freeform","width":900,"height":700},"viewport":{"width":900,"height":700},"tabs":[{"tabId":"tab_d_bea12b60-c14f-4580-bb58-2b38123bd480","owner":"agent","ownedByCaller":true},{"tabId":"tab_e_bea12b60-c14f-4580-bb58-2b38123bd480","owner":"agent","ownedByCaller":true},{"tabId":"tab_g_bea12b60-c14f-4580-bb58-2b38123bd480","owner":"unclaimed","ownedByCaller":false}]}}}
{"time":"2026-11-10T11:39:46.054Z","tool":"preview_evaluate","caller":0,"result":{"isError":false,"structuredContent":{"toolIcon":{"_tag":"website","pageUrl":"http://127.0.0.1:18766/fixture"},"value":{"width":600,"height":467,"cookie":"","loads":"9"}}}}
{"time":"2026-11-10T11:39:46.063Z","tool":"preview_status","caller":0,"result":{"isError":false,"selectedStatusFields":{"available":true,"tabId":"tab_e_bea12b60-c14f-4580-bb58-2b38123bd480","url":"http://127.0.0.1:18766/fixture","loading":false,"control":{"owner":"agent","ownedByCaller":true,"generation":0},"dialog":null,"viewportSetting":{"_tag":"freeform","width":900,"height":700},"viewport":{"width":900,"height":700},"tabs":[{"tabId":"tab_d_bea12b60-c14f-4580-bb58-2b38123bd480","owner":"agent","ownedByCaller":true},{"tabId":"tab_e_bea12b60-c14f-4580-bb58-2b38123bd480","owner":"agent","ownedByCaller":true},{"tabId":"tab_g_bea12b60-c14f-4580-bb58-2b38123bd480","owner":"unclaimed","ownedByCaller":false}]}}}
{"time":"2026-11-10T11:39:46.074Z","tool":"t3_preview_close","caller":0,"result":{"isError":false,"structuredContent":{}}}
{"time":"2026-11-10T11:39:46.088Z","tool":"t3_preview_close","caller":0,"result":{"isError":false,"structuredContent":{}}}
{"time":"2026-11-10T11:39:45.301Z","event":"RPC.result","method":"preview.adjust","result":{"tabId":"tab_e_bea12b60-c14f-4580-bb58-2b38123bd480","viewport":{"_tag":"freeform","width":900,"height":700},"colorScheme":"dark","zoomFactor":1.5}}
{"time":"2026-11-10T11:39:45.605Z","event":"RPC.result","method":"preview.adjust","result":{"tabId":"tab_e_bea12b60-c14f-4580-bb58-2b38123bd480","viewport":{"_tag":"freeform","width":900,"height":700},"colorScheme":"light","zoomFactor":1.5}}
{"time":"2026-11-10T11:39:45.607Z","event":"RPC.result","method":"preview.resize","result":{"tabId":"tab_g_bea12b60-c14f-4580-bb58-2b38123bd480","viewport":{"_tag":"freeform","width":650,"height":450}}}
{"time":"2026-11-10T11:39:46.093Z","event":"RPC.result","method":"preview.close"}
```

Relevant server milestones:

```jsonl
{"time":"2026-11-10T11:37:01.802Z","event":"host.connected","connectionId":"df66ae07-3409-4a36-adf5-acca7ed48f60"}
{"time":"2026-11-10T11:39:38.436Z","event":"host.connected","connectionId":"a4ed59d2-1007-4877-9053-374f3fd9a6d0"}
{"time":"2026-11-10T11:39:45.299Z","event":"mirror.received","type":"resized","tabId":"tab_e_bea12b60-c14f-4580-bb58-2b38123bd480"}
{"time":"2026-11-10T11:39:45.300Z","tabId":"tab_e_bea12b60-c14f-4580-bb58-2b38123bd480","event":"emulateMedia.start","detail":[{"colorScheme":"dark"}]}
{"time":"2026-11-10T11:39:45.300Z","tabId":"tab_e_bea12b60-c14f-4580-bb58-2b38123bd480","event":"emulateMedia.error","detail":"Error: Synthetic one-shot rendering failure"}
{"time":"2026-11-10T11:39:45.300Z","event":"server.warning","message":"[11:39:45.300] WARN (#7724): server preview could not apply a tab setting","detail":"  {\n    cause: Error: Synthetic one-shot rendering failure\n        at gate (file:///home/user/wt/pr-32866-cap-before/apps/server/src/preview/ServerBrowser.ts:922:32)\n        at async <computed> [as emulateMedia] (file:///home/user/wt/pr-32866-cap-before/apps/server/src/preview/ServerBrowser.ts:926:90)\n        at async applyRendering (file:///home/user/wt/pr-32866-cap-before/apps/server/src/preview/ServerBrowser.ts:733:7)\n        at async file:///home/user/wt/pr-32866-cap-before/apps/server/src/preview/ServerBrowser.ts:2401:13\n  }\nCAPTURE {\"time\":\"2026-11-10T11:39:45.604Z\",\"event\":\"mirror.received\",\"type\":\"resized\",\"tabId\":\"tab_e_bea12b60-c14f-4580-bb58-2b38123bd480\"}"}
{"time":"2026-11-10T11:39:45.604Z","event":"mirror.received","type":"resized","tabId":"tab_e_bea12b60-c14f-4580-bb58-2b38123bd480"}
{"time":"2026-11-10T11:39:45.604Z","tabId":"tab_e_bea12b60-c14f-4580-bb58-2b38123bd480","event":"emulateMedia.start","detail":[{"colorScheme":"light"}]}
{"time":"2026-11-10T11:39:45.606Z","tabId":"tab_e_bea12b60-c14f-4580-bb58-2b38123bd480","event":"emulateMedia.end","detail":{}}
{"time":"2026-11-10T11:39:45.606Z","event":"mirror.received","type":"resized","tabId":"tab_g_bea12b60-c14f-4580-bb58-2b38123bd480"}
{"time":"2026-11-10T11:39:45.607Z","tabId":"tab_g_bea12b60-c14f-4580-bb58-2b38123bd480","event":"setViewportSize.start","detail":[{"width":650,"height":450}]}
{"time":"2026-11-10T11:39:45.609Z","tabId":"tab_g_bea12b60-c14f-4580-bb58-2b38123bd480","event":"setViewportSize.end","detail":{}}
{"time":"2026-11-10T11:39:45.609Z","tabId":"tab_g_bea12b60-c14f-4580-bb58-2b38123bd480","event":"setViewportSize.start","detail":[{"width":650,"height":450}]}
{"time":"2026-11-10T11:39:45.609Z","tabId":"tab_g_bea12b60-c14f-4580-bb58-2b38123bd480","event":"setViewportSize.end","detail":{}}
{"time":"2026-11-10T11:39:46.084Z","event":"dropTab","tabId":"tab_e_bea12b60-c14f-4580-bb58-2b38123bd480","recording":false}
{"time":"2026-11-10T11:39:46.084Z","tabId":"tab_e_bea12b60-c14f-4580-bb58-2b38123bd480","event":"close.start","detail":[]}
{"time":"2026-11-10T11:39:46.084Z","tabId":"tab_e_bea12b60-c14f-4580-bb58-2b38123bd480","event":"context.close.start","detail":{}}
{"time":"2026-11-10T11:39:46.084Z","event":"dropTab","tabId":"tab_e_bea12b60-c14f-4580-bb58-2b38123bd480","recording":false}
{"time":"2026-11-10T11:39:46.089Z","tabId":"tab_e_bea12b60-c14f-4580-bb58-2b38123bd480","event":"page.closed","detail":{}}
{"time":"2026-11-10T11:39:46.089Z","event":"dropTab","tabId":"tab_e_bea12b60-c14f-4580-bb58-2b38123bd480","recording":false}
{"time":"2026-11-10T11:39:46.089Z","tabId":"tab_e_bea12b60-c14f-4580-bb58-2b38123bd480","event":"close.end","detail":{}}
{"time":"2026-11-10T11:39:46.091Z","tabId":"tab_e_bea12b60-c14f-4580-bb58-2b38123bd480","event":"context.close.end","detail":{}}
{"time":"2026-11-10T11:39:46.091Z","event":"dropTab","tabId":"tab_g_bea12b60-c14f-4580-bb58-2b38123bd480","recording":false}
{"time":"2026-11-10T11:39:46.091Z","tabId":"tab_g_bea12b60-c14f-4580-bb58-2b38123bd480","event":"close.start","detail":[]}
```

<a id="after"></a>
## After — C5

SHA: [b088b88d19](https://github.com/pingdotgg/t3code/commit/b088b88d19fb0edc43f754da2e1d199bda70d6d8)

Agent-visible results (status/list fields selected; error text verbatim):

```jsonl
{"time":"2026-11-10T11:36:55.139Z","tool":"preview_open","caller":0,"result":{"isError":false,"selectedStatusFields":{"available":true,"tabId":"tab_c_bd9d2d9d-727d-4676-b1e8-9554a31f1406","url":null,"loading":false,"control":{"owner":"agent","ownedByCaller":true,"generation":0},"dialog":null,"viewportSetting":{"_tag":"fill"},"viewport":{"width":1280,"height":800},"tabs":[{"tabId":"tab_c_bd9d2d9d-727d-4676-b1e8-9554a31f1406","owner":"agent","ownedByCaller":true}]}}}
{"time":"2026-11-10T11:36:55.197Z","tool":"preview_open","caller":0,"result":{"isError":false,"selectedStatusFields":{"available":true,"tabId":"tab_d_bd9d2d9d-727d-4676-b1e8-9554a31f1406","url":null,"loading":false,"control":{"owner":"agent","ownedByCaller":true,"generation":0},"dialog":null,"viewportSetting":{"_tag":"fill"},"viewport":{"width":1280,"height":800},"tabs":[{"tabId":"tab_c_bd9d2d9d-727d-4676-b1e8-9554a31f1406","owner":"agent","ownedByCaller":true},{"tabId":"tab_d_bd9d2d9d-727d-4676-b1e8-9554a31f1406","owner":"agent","ownedByCaller":true}]}}}
{"time":"2026-11-10T11:36:55.261Z","tool":"preview_open","caller":0,"result":{"isError":false,"selectedStatusFields":{"available":true,"tabId":"tab_e_bd9d2d9d-727d-4676-b1e8-9554a31f1406","url":null,"loading":false,"control":{"owner":"agent","ownedByCaller":true,"generation":0},"dialog":null,"viewportSetting":{"_tag":"fill"},"viewport":{"width":1280,"height":800},"tabs":[{"tabId":"tab_c_bd9d2d9d-727d-4676-b1e8-9554a31f1406","owner":"agent","ownedByCaller":true},{"tabId":"tab_d_bd9d2d9d-727d-4676-b1e8-9554a31f1406","owner":"agent","ownedByCaller":true},{"tabId":"tab_e_bd9d2d9d-727d-4676-b1e8-9554a31f1406","owner":"agent","ownedByCaller":true}]}}}
{"time":"2026-11-10T11:36:55.469Z","tool":"preview_navigate","caller":0,"result":{"isError":false,"selectedStatusFields":{"available":true,"tabId":"tab_d_bd9d2d9d-727d-4676-b1e8-9554a31f1406","url":"http://127.0.0.1:18766/fixture","loading":false,"control":{"owner":"agent","ownedByCaller":true,"generation":0},"dialog":null,"viewportSetting":{"_tag":"fill"},"viewport":{"width":1280,"height":800},"tabs":[{"tabId":"tab_c_bd9d2d9d-727d-4676-b1e8-9554a31f1406","owner":"agent","ownedByCaller":true},{"tabId":"tab_d_bd9d2d9d-727d-4676-b1e8-9554a31f1406","owner":"agent","ownedByCaller":true},{"tabId":"tab_e_bd9d2d9d-727d-4676-b1e8-9554a31f1406","owner":"agent","ownedByCaller":true}]}}}
{"time":"2026-11-10T11:37:10.993Z","tool":"preview_set_appearance","caller":0,"result":{"content":[{"type":"text","text":"Preview automation setColorScheme timed out after 15000ms."}],"isError":true}}
{"time":"2026-11-10T11:37:19.608Z","tool":"preview_status","caller":0,"result":{"isError":false,"selectedStatusFields":{"available":true,"tabId":"tab_d_bd9d2d9d-727d-4676-b1e8-9554a31f1406","url":"http://127.0.0.1:18766/fixture","loading":false,"control":{"owner":"agent","ownedByCaller":true,"generation":0},"dialog":null,"viewportSetting":{"_tag":"freeform","width":900,"height":700},"viewport":{"width":900,"height":700},"tabs":[{"tabId":"tab_c_bd9d2d9d-727d-4676-b1e8-9554a31f1406","owner":"agent","ownedByCaller":true},{"tabId":"tab_d_bd9d2d9d-727d-4676-b1e8-9554a31f1406","owner":"agent","ownedByCaller":true},{"tabId":"tab_f_bd9d2d9d-727d-4676-b1e8-9554a31f1406","owner":"unclaimed","ownedByCaller":false}]}}}
{"time":"2026-11-10T11:37:19.623Z","tool":"preview_evaluate","caller":0,"result":{"isError":false,"structuredContent":{"toolIcon":{"_tag":"website","pageUrl":"http://127.0.0.1:18766/fixture"},"value":{"width":600,"height":467,"cookie":"","loads":"4"}}}}
{"time":"2026-11-10T11:37:19.639Z","tool":"preview_status","caller":0,"result":{"isError":false,"selectedStatusFields":{"available":true,"tabId":"tab_d_bd9d2d9d-727d-4676-b1e8-9554a31f1406","url":"http://127.0.0.1:18766/fixture","loading":false,"control":{"owner":"agent","ownedByCaller":true,"generation":0},"dialog":null,"viewportSetting":{"_tag":"freeform","width":900,"height":700},"viewport":{"width":900,"height":700},"tabs":[{"tabId":"tab_c_bd9d2d9d-727d-4676-b1e8-9554a31f1406","owner":"agent","ownedByCaller":true},{"tabId":"tab_d_bd9d2d9d-727d-4676-b1e8-9554a31f1406","owner":"agent","ownedByCaller":true},{"tabId":"tab_f_bd9d2d9d-727d-4676-b1e8-9554a31f1406","owner":"unclaimed","ownedByCaller":false}]}}}
{"time":"2026-11-10T11:37:19.656Z","tool":"t3_preview_close","caller":0,"result":{"isError":false,"structuredContent":{}}}
{"time":"2026-11-10T11:37:19.670Z","tool":"t3_preview_close","caller":0,"result":{"isError":false,"structuredContent":{}}}
{"time":"2026-11-10T11:37:18.882Z","event":"RPC.result","method":"preview.adjust","result":{"tabId":"tab_d_bd9d2d9d-727d-4676-b1e8-9554a31f1406","viewport":{"_tag":"freeform","width":900,"height":700},"colorScheme":"dark","zoomFactor":1.5}}
{"time":"2026-11-10T11:37:19.190Z","event":"RPC.result","method":"preview.adjust","result":{"tabId":"tab_d_bd9d2d9d-727d-4676-b1e8-9554a31f1406","viewport":{"_tag":"freeform","width":900,"height":700},"colorScheme":"light","zoomFactor":1.5}}
{"time":"2026-11-10T11:37:19.196Z","event":"RPC.result","method":"preview.resize","result":{"tabId":"tab_f_bd9d2d9d-727d-4676-b1e8-9554a31f1406","viewport":{"_tag":"freeform","width":650,"height":450}}}
{"time":"2026-11-10T11:37:19.675Z","event":"RPC.result","method":"preview.close"}
```

Relevant server milestones:

```jsonl
{"time":"2026-11-10T11:29:29.949Z","event":"host.connected","connectionId":"09b81d2d-300e-436a-8035-a1f18530f0d1"}
{"time":"2026-11-10T11:37:18.877Z","event":"mirror.received","type":"resized","tabId":"tab_d_bd9d2d9d-727d-4676-b1e8-9554a31f1406"}
{"time":"2026-11-10T11:37:18.878Z","tabId":"tab_d_bd9d2d9d-727d-4676-b1e8-9554a31f1406","event":"emulateMedia.start","detail":[{"colorScheme":"dark"}]}
{"time":"2026-11-10T11:37:18.879Z","tabId":"tab_d_bd9d2d9d-727d-4676-b1e8-9554a31f1406","event":"emulateMedia.error","detail":"Error: Synthetic one-shot rendering failure"}
{"time":"2026-11-10T11:37:18.879Z","event":"server.warning","message":"[11:37:18.879] WARN (#7126): server preview could not apply a tab setting","detail":"  {\n    cause: Error: Synthetic one-shot rendering failure\n        at gate (file:///home/user/wt/pr-32866-cap-after/apps/server/src/preview/ServerBrowser.ts:924:32)\n        at async <computed> [as emulateMedia] (file:///home/user/wt/pr-32866-cap-after/apps/server/src/preview/ServerBrowser.ts:928:90)\n        at async applyRendering (file:///home/user/wt/pr-32866-cap-after/apps/server/src/preview/ServerBrowser.ts:735:7)\n        at async file:///home/user/wt/pr-32866-cap-after/apps/server/src/preview/ServerBrowser.ts:2438:13\n  }\nCAPTURE {\"time\":\"2026-11-10T11:37:19.186Z\",\"event\":\"mirror.received\",\"type\":\"resized\",\"tabId\":\"tab_d_bd9d2d9d-727d-4676-b1e8-9554a31f1406\"}"}
{"time":"2026-11-10T11:37:19.186Z","event":"mirror.received","type":"resized","tabId":"tab_d_bd9d2d9d-727d-4676-b1e8-9554a31f1406"}
{"time":"2026-11-10T11:37:19.186Z","tabId":"tab_d_bd9d2d9d-727d-4676-b1e8-9554a31f1406","event":"emulateMedia.start","detail":[{"colorScheme":"light"}]}
{"time":"2026-11-10T11:37:19.190Z","tabId":"tab_d_bd9d2d9d-727d-4676-b1e8-9554a31f1406","event":"emulateMedia.end","detail":{}}
{"time":"2026-11-10T11:37:19.194Z","event":"mirror.received","type":"resized","tabId":"tab_f_bd9d2d9d-727d-4676-b1e8-9554a31f1406"}
{"time":"2026-11-10T11:37:19.194Z","tabId":"tab_f_bd9d2d9d-727d-4676-b1e8-9554a31f1406","event":"setViewportSize.start","detail":[{"width":650,"height":450}]}
{"time":"2026-11-10T11:37:19.197Z","tabId":"tab_f_bd9d2d9d-727d-4676-b1e8-9554a31f1406","event":"setViewportSize.end","detail":{}}
{"time":"2026-11-10T11:37:19.197Z","tabId":"tab_f_bd9d2d9d-727d-4676-b1e8-9554a31f1406","event":"setViewportSize.start","detail":[{"width":650,"height":450}]}
{"time":"2026-11-10T11:37:19.198Z","tabId":"tab_f_bd9d2d9d-727d-4676-b1e8-9554a31f1406","event":"setViewportSize.end","detail":{}}
{"time":"2026-11-10T11:37:19.664Z","event":"dropTab","tabId":"tab_d_bd9d2d9d-727d-4676-b1e8-9554a31f1406","recording":false}
{"time":"2026-11-10T11:37:19.664Z","tabId":"tab_d_bd9d2d9d-727d-4676-b1e8-9554a31f1406","event":"close.start","detail":[]}
{"time":"2026-11-10T11:37:19.664Z","tabId":"tab_d_bd9d2d9d-727d-4676-b1e8-9554a31f1406","event":"context.close.start","detail":{}}
{"time":"2026-11-10T11:37:19.665Z","event":"dropTab","tabId":"tab_d_bd9d2d9d-727d-4676-b1e8-9554a31f1406","recording":false}
{"time":"2026-11-10T11:37:19.670Z","tabId":"tab_d_bd9d2d9d-727d-4676-b1e8-9554a31f1406","event":"page.closed","detail":{}}
{"time":"2026-11-10T11:37:19.670Z","event":"dropTab","tabId":"tab_d_bd9d2d9d-727d-4676-b1e8-9554a31f1406","recording":false}
{"time":"2026-11-10T11:37:19.670Z","tabId":"tab_d_bd9d2d9d-727d-4676-b1e8-9554a31f1406","event":"close.end","detail":{}}
{"time":"2026-11-10T11:37:19.672Z","event":"dropTab","tabId":"tab_f_bd9d2d9d-727d-4676-b1e8-9554a31f1406","recording":false}
{"time":"2026-11-10T11:37:19.672Z","tabId":"tab_f_bd9d2d9d-727d-4676-b1e8-9554a31f1406","event":"close.start","detail":[]}
{"time":"2026-11-10T11:37:19.675Z","tabId":"tab_d_bd9d2d9d-727d-4676-b1e8-9554a31f1406","event":"context.close.end","detail":{}}
```

AI-assisted; verified with the tests and tools listed above.