# R19 — Stop after busy

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): Record before the hold; request recordingStop only after appearance expiry, both without a dialog and while a real dialog is pending; close is the escape.

What differed: Without dialog: busy after; queued/disconnected before. With overdue dialog: dialogPending after, 120s timeout before. Human ownership still takes precedence.

## C1 steps and timestamps

Before step times (UTC):

```jsonl
{"time":"2026-11-10T11:41:04.858Z","tool":"preview_open","caller":0,"args":{"reuseExistingTab":false,"open":false}}
{"time":"2026-11-10T11:41:05.152Z","tool":"preview_recording_start","caller":0,"args":{"tabId":"tab_1_1322bfd2-cca3-4137-992e-c9da3d086a36"}}
{"time":"2026-11-10T11:41:05.619Z","tool":"preview_set_appearance","caller":0,"args":{"tabId":"tab_1_1322bfd2-cca3-4137-992e-c9da3d086a36","colorScheme":"dark"}}
{"time":"2026-11-10T11:41:23.138Z","tool":"preview_wait_for","caller":0,"args":{"tabId":"tab_1_1322bfd2-cca3-4137-992e-c9da3d086a36","selector":"body","timeoutMs":1500}}
{"time":"2026-11-10T11:41:23.140Z","tool":"preview_recording_stop","caller":0,"args":{"tabId":"tab_1_1322bfd2-cca3-4137-992e-c9da3d086a36"}}
{"time":"2026-11-10T11:41:27.998Z","tool":"t3_preview_close","caller":0,"args":{"tabId":"tab_1_1322bfd2-cca3-4137-992e-c9da3d086a36"}}
{"time":"2026-11-10T11:41:28.033Z","tool":"t3_preview_close","caller":0,"args":{"tabId":"tab_2_1322bfd2-cca3-4137-992e-c9da3d086a36"}}
{"time":"2026-11-10T11:41:28.046Z","tool":"t3_preview_close","caller":1,"args":{"tabId":"tab_3_1322bfd2-cca3-4137-992e-c9da3d086a36"}}
```

After step times (UTC):

```jsonl
{"time":"2026-11-10T11:39:22.279Z","tool":"preview_open","caller":0,"args":{"reuseExistingTab":false,"open":false}}
{"time":"2026-11-10T11:39:22.933Z","tool":"preview_recording_start","caller":0,"args":{"tabId":"tab_1_b49bf147-bc21-4874-9243-25ceadea1fd3"}}
{"time":"2026-11-10T11:39:23.623Z","tool":"preview_set_appearance","caller":0,"args":{"tabId":"tab_1_b49bf147-bc21-4874-9243-25ceadea1fd3","colorScheme":"dark"}}
{"time":"2026-11-10T11:39:40.665Z","tool":"preview_wait_for","caller":0,"args":{"tabId":"tab_1_b49bf147-bc21-4874-9243-25ceadea1fd3","selector":"body","timeoutMs":1500}}
{"time":"2026-11-10T11:39:40.667Z","tool":"preview_recording_stop","caller":0,"args":{"tabId":"tab_1_b49bf147-bc21-4874-9243-25ceadea1fd3"}}
{"time":"2026-11-10T11:39:43.201Z","tool":"t3_preview_close","caller":0,"args":{"tabId":"tab_1_b49bf147-bc21-4874-9243-25ceadea1fd3"}}
{"time":"2026-11-10T11:39:43.247Z","tool":"t3_preview_close","caller":0,"args":{"tabId":"tab_2_b49bf147-bc21-4874-9243-25ceadea1fd3"}}
{"time":"2026-11-10T11:39:43.261Z","tool":"t3_preview_close","caller":1,"args":{"tabId":"tab_3_b49bf147-bc21-4874-9243-25ceadea1fd3"}}
```

<a id="before"></a>
<a id="before-c1"></a>
## Before — C1

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

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

```jsonl
{"time":"2026-11-10T11:41:05.151Z","tool":"preview_open","caller":0,"result":{"isError":false,"selectedStatusFields":{"available":true,"tabId":"tab_1_1322bfd2-cca3-4137-992e-c9da3d086a36","url":null,"loading":false,"control":{"owner":"agent","ownedByCaller":true,"generation":0},"dialog":null,"viewportSetting":{"_tag":"fill"},"viewport":{"width":1280,"height":800},"tabs":[{"tabId":"tab_1_1322bfd2-cca3-4137-992e-c9da3d086a36","owner":"agent","ownedByCaller":true}]}}}
{"time":"2026-11-10T11:41:05.619Z","tool":"preview_recording_start","caller":0,"result":{"isError":false,"structuredContent":{"tabId":"tab_1_1322bfd2-cca3-4137-992e-c9da3d086a36","recording":true,"startedAt":"2026-11-10T11:41:05.615Z"}}}
{"time":"2026-11-10T11:41:21.634Z","tool":"preview_set_appearance","caller":0,"result":{"content":[{"type":"text","text":"Preview automation setColorScheme timed out after 15000ms."}],"isError":true}}
{"time":"2026-11-10T11:41:25.659Z","tool":"preview_wait_for","caller":0,"result":{"content":[{"type":"text","text":"Preview automation waitFor timed out after 1500ms."}],"isError":true}}
{"time":"2026-11-10T11:41:25.659Z","tool":"preview_recording_stop","caller":0,"result":{"content":[{"type":"text","text":"Preview automation client server-browser disconnected during recordingStop."}],"isError":true}}
{"time":"2026-11-10T11:41:28.011Z","tool":"t3_preview_close","caller":0,"result":{"isError":false,"structuredContent":{}}}
{"time":"2026-11-10T11:41:28.046Z","tool":"t3_preview_close","caller":0,"result":{"isError":false,"structuredContent":{}}}
{"time":"2026-11-10T11:41:28.059Z","tool":"t3_preview_close","caller":1,"result":{"isError":false,"structuredContent":{}}}
```

Relevant server milestones:

```jsonl
{"time":"2026-11-10T11:40:40.304Z","event":"host.connected","connectionId":"3544549b-189b-45a7-82f5-323c2a31b83d"}
{"time":"2026-11-10T11:41:04.869Z","event":"request.start","operation":"open","requestId":"preview-0","timeoutMs":660000,"connectionId":"3544549b-189b-45a7-82f5-323c2a31b83d"}
{"time":"2026-11-10T11:41:05.142Z","tabId":"tab_1_1322bfd2-cca3-4137-992e-c9da3d086a36","event":"tab.created","detail":{"desktop":false,"isolatedContext":true}}
{"time":"2026-11-10T11:41:05.144Z","event":"operation.settled","requestId":"preview-0","operation":"open","ok":true}
{"time":"2026-11-10T11:41:05.157Z","event":"request.start","operation":"recordingStart","requestId":"preview-1","tabId":"tab_1_1322bfd2-cca3-4137-992e-c9da3d086a36","timeoutMs":15000,"connectionId":"3544549b-189b-45a7-82f5-323c2a31b83d"}
{"time":"2026-11-10T11:41:05.615Z","event":"operation.settled","requestId":"preview-1","operation":"recordingStart","ok":true}
{"time":"2026-11-10T11:41:05.627Z","event":"request.start","operation":"setColorScheme","requestId":"preview-3","tabId":"tab_1_1322bfd2-cca3-4137-992e-c9da3d086a36","timeoutMs":15000,"connectionId":"3544549b-189b-45a7-82f5-323c2a31b83d"}
{"time":"2026-11-10T11:41:05.628Z","tabId":"tab_1_1322bfd2-cca3-4137-992e-c9da3d086a36","event":"emulateMedia.start","detail":[{"colorScheme":"dark"}]}
{"time":"2026-11-10T11:41:05.628Z","tabId":"tab_1_1322bfd2-cca3-4137-992e-c9da3d086a36","event":"emulateMedia.held","detail":{}}
{"time":"2026-11-10T11:41:22.632Z","event":"host.connected","connectionId":"b8744c25-255d-49da-99b2-c9b7d2fa21c8"}
{"time":"2026-11-10T11:41:23.152Z","event":"request.start","operation":"waitFor","requestId":"preview-5","tabId":"tab_1_1322bfd2-cca3-4137-992e-c9da3d086a36","timeoutMs":1500,"connectionId":"b8744c25-255d-49da-99b2-c9b7d2fa21c8"}
{"time":"2026-11-10T11:41:23.165Z","event":"request.start","operation":"recordingStop","requestId":"preview-10","tabId":"tab_1_1322bfd2-cca3-4137-992e-c9da3d086a36","timeoutMs":120000,"connectionId":"b8744c25-255d-49da-99b2-c9b7d2fa21c8"}
{"time":"2026-11-10T11:41:26.652Z","event":"host.connected","connectionId":"e4558845-047d-4489-8aed-1f3ec563d9e4"}
{"time":"2026-11-10T11:41:27.221Z","tabId":"tab_2_1322bfd2-cca3-4137-992e-c9da3d086a36","event":"tab.created","detail":{"desktop":false,"isolatedContext":true}}
{"time":"2026-11-10T11:41:27.291Z","tabId":"tab_3_1322bfd2-cca3-4137-992e-c9da3d086a36","event":"tab.created","detail":{"desktop":false,"isolatedContext":true}}
{"time":"2026-11-10T11:41:28.005Z","event":"request.start","operation":"close","requestId":"preview-29","tabId":"tab_1_1322bfd2-cca3-4137-992e-c9da3d086a36","timeoutMs":15000,"connectionId":"e4558845-047d-4489-8aed-1f3ec563d9e4"}
{"time":"2026-11-10T11:41:28.006Z","event":"operation.settled","requestId":"preview-29","operation":"close","ok":true}
{"time":"2026-11-10T11:41:28.014Z","event":"recording.encoder.page.closed","tabId":"tab_1_1322bfd2-cca3-4137-992e-c9da3d086a36"}
{"time":"2026-11-10T11:41:28.039Z","tabId":"tab_1_1322bfd2-cca3-4137-992e-c9da3d086a36","event":"emulateMedia.error","detail":"Error: page.emulateMedia: Target page, context or browser has been closed"}
{"time":"2026-11-10T11:41:28.039Z","event":"operation.settled","requestId":"preview-3","operation":"setColorScheme","ok":false,"error":"Error: page.emulateMedia: Target page, context or browser has been closed"}
{"time":"2026-11-10T11:41:28.040Z","event":"operation.settled","requestId":"preview-5","operation":"waitFor","ok":false,"error":"BrowserControlInterrupted: This browser tab is closed."}
{"time":"2026-11-10T11:41:28.040Z","event":"operation.settled","requestId":"preview-10","operation":"recordingStop","ok":false,"error":"BrowserControlInterrupted: This browser tab is closed."}
{"time":"2026-11-10T11:41:28.042Z","event":"request.start","operation":"close","requestId":"preview-32","tabId":"tab_2_1322bfd2-cca3-4137-992e-c9da3d086a36","timeoutMs":15000,"connectionId":"e4558845-047d-4489-8aed-1f3ec563d9e4"}
{"time":"2026-11-10T11:41:28.043Z","event":"operation.settled","requestId":"preview-32","operation":"close","ok":true}
{"time":"2026-11-10T11:41:28.056Z","event":"request.start","operation":"close","requestId":"preview-33","tabId":"tab_3_1322bfd2-cca3-4137-992e-c9da3d086a36","timeoutMs":15000,"connectionId":"e4558845-047d-4489-8aed-1f3ec563d9e4"}
{"time":"2026-11-10T11:41:28.057Z","event":"operation.settled","requestId":"preview-33","operation":"close","ok":true}
```

<a id="after"></a>
<a id="after-c1"></a>
## After — C1

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

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

```jsonl
{"time":"2026-11-10T11:39:22.933Z","tool":"preview_open","caller":0,"result":{"isError":false,"selectedStatusFields":{"available":true,"tabId":"tab_1_b49bf147-bc21-4874-9243-25ceadea1fd3","url":null,"loading":false,"control":{"owner":"agent","ownedByCaller":true,"generation":0},"dialog":null,"viewportSetting":{"_tag":"fill"},"viewport":{"width":1280,"height":800},"tabs":[{"tabId":"tab_1_b49bf147-bc21-4874-9243-25ceadea1fd3","owner":"agent","ownedByCaller":true}]}}}
{"time":"2026-11-10T11:39:23.621Z","tool":"preview_recording_start","caller":0,"result":{"isError":false,"structuredContent":{"tabId":"tab_1_b49bf147-bc21-4874-9243-25ceadea1fd3","recording":true,"startedAt":"2026-11-10T11:39:23.612Z"}}}
{"time":"2026-11-10T11:39:39.162Z","tool":"preview_set_appearance","caller":0,"result":{"content":[{"type":"text","text":"Preview automation setColorScheme timed out after 15000ms."}],"isError":true}}
{"time":"2026-11-10T11:39:40.696Z","tool":"preview_wait_for","caller":0,"result":{"content":[{"type":"text","text":"This browser tab is busy with an earlier action that timed out. Open a new tab with preview_open and reuseExistingTab=false, or close this one with t3_preview_close."}],"isError":true}}
{"time":"2026-11-10T11:39:40.743Z","tool":"preview_recording_stop","caller":0,"result":{"content":[{"type":"text","text":"This browser tab is busy with an earlier action that timed out. Open a new tab with preview_open and reuseExistingTab=false, or close this one with t3_preview_close."}],"isError":true}}
{"time":"2026-11-10T11:39:43.218Z","tool":"t3_preview_close","caller":0,"result":{"isError":false,"structuredContent":{}}}
{"time":"2026-11-10T11:39:43.261Z","tool":"t3_preview_close","caller":0,"result":{"isError":false,"structuredContent":{}}}
{"time":"2026-11-10T11:39:43.275Z","tool":"t3_preview_close","caller":1,"result":{"isError":false,"structuredContent":{}}}
```

Relevant server milestones:

```jsonl
{"time":"2026-11-10T11:38:06.533Z","event":"host.connected","connectionId":"61893f52-5b7b-45e6-b0a0-72e49d4ebf16"}
{"time":"2026-11-10T11:39:22.295Z","event":"request.start","operation":"open","requestId":"preview-0","timeoutMs":660000,"connectionId":"61893f52-5b7b-45e6-b0a0-72e49d4ebf16"}
{"time":"2026-11-10T11:39:22.916Z","tabId":"tab_1_b49bf147-bc21-4874-9243-25ceadea1fd3","event":"tab.created","detail":{"desktop":false,"isolatedContext":true}}
{"time":"2026-11-10T11:39:22.920Z","event":"operation.settled","requestId":"preview-0","operation":"open","ok":true}
{"time":"2026-11-10T11:39:22.943Z","event":"request.start","operation":"recordingStart","requestId":"preview-1","tabId":"tab_1_b49bf147-bc21-4874-9243-25ceadea1fd3","timeoutMs":15000,"connectionId":"61893f52-5b7b-45e6-b0a0-72e49d4ebf16"}
{"time":"2026-11-10T11:39:23.612Z","event":"operation.settled","requestId":"preview-1","operation":"recordingStart","ok":true}
{"time":"2026-11-10T11:39:23.652Z","event":"request.start","operation":"setColorScheme","requestId":"preview-3","tabId":"tab_1_b49bf147-bc21-4874-9243-25ceadea1fd3","timeoutMs":15000,"connectionId":"61893f52-5b7b-45e6-b0a0-72e49d4ebf16"}
{"time":"2026-11-10T11:39:23.654Z","tabId":"tab_1_b49bf147-bc21-4874-9243-25ceadea1fd3","event":"emulateMedia.start","detail":[{"colorScheme":"dark"}]}
{"time":"2026-11-10T11:39:23.655Z","tabId":"tab_1_b49bf147-bc21-4874-9243-25ceadea1fd3","event":"emulateMedia.held","detail":{}}
{"time":"2026-11-10T11:39:40.689Z","event":"request.start","operation":"waitFor","requestId":"preview-5","tabId":"tab_1_b49bf147-bc21-4874-9243-25ceadea1fd3","timeoutMs":1500,"connectionId":"61893f52-5b7b-45e6-b0a0-72e49d4ebf16"}
{"time":"2026-11-10T11:39:40.689Z","event":"operation.settled","requestId":"preview-5","operation":"waitFor","ok":false,"error":"BrowserControlInterrupted: An earlier action on this tab timed out and is still running."}
{"time":"2026-11-10T11:39:40.739Z","event":"request.start","operation":"recordingStop","requestId":"preview-10","tabId":"tab_1_b49bf147-bc21-4874-9243-25ceadea1fd3","timeoutMs":120000,"connectionId":"61893f52-5b7b-45e6-b0a0-72e49d4ebf16"}
{"time":"2026-11-10T11:39:40.739Z","event":"operation.settled","requestId":"preview-10","operation":"recordingStop","ok":false,"error":"BrowserControlInterrupted: An earlier action on this tab timed out and is still running."}
{"time":"2026-11-10T11:39:42.438Z","tabId":"tab_2_b49bf147-bc21-4874-9243-25ceadea1fd3","event":"tab.created","detail":{"desktop":false,"isolatedContext":true}}
{"time":"2026-11-10T11:39:42.509Z","tabId":"tab_3_b49bf147-bc21-4874-9243-25ceadea1fd3","event":"tab.created","detail":{"desktop":false,"isolatedContext":true}}
{"time":"2026-11-10T11:39:43.209Z","event":"request.start","operation":"close","requestId":"preview-29","tabId":"tab_1_b49bf147-bc21-4874-9243-25ceadea1fd3","timeoutMs":15000,"connectionId":"61893f52-5b7b-45e6-b0a0-72e49d4ebf16"}
{"time":"2026-11-10T11:39:43.213Z","event":"operation.settled","requestId":"preview-29","operation":"close","ok":true}
{"time":"2026-11-10T11:39:43.221Z","event":"recording.encoder.page.closed","tabId":"tab_1_b49bf147-bc21-4874-9243-25ceadea1fd3"}
{"time":"2026-11-10T11:39:43.251Z","tabId":"tab_1_b49bf147-bc21-4874-9243-25ceadea1fd3","event":"emulateMedia.error","detail":"Error: page.emulateMedia: Target page, context or browser has been closed"}
{"time":"2026-11-10T11:39:43.252Z","event":"operation.settled","requestId":"preview-3","operation":"setColorScheme","ok":false,"error":"Error: page.emulateMedia: Target page, context or browser has been closed"}
{"time":"2026-11-10T11:39:43.256Z","event":"request.start","operation":"close","requestId":"preview-32","tabId":"tab_2_b49bf147-bc21-4874-9243-25ceadea1fd3","timeoutMs":15000,"connectionId":"61893f52-5b7b-45e6-b0a0-72e49d4ebf16"}
{"time":"2026-11-10T11:39:43.258Z","event":"operation.settled","requestId":"preview-32","operation":"close","ok":true}
{"time":"2026-11-10T11:39:43.267Z","event":"request.start","operation":"close","requestId":"preview-33","tabId":"tab_3_b49bf147-bc21-4874-9243-25ceadea1fd3","timeoutMs":15000,"connectionId":"61893f52-5b7b-45e6-b0a0-72e49d4ebf16"}
{"time":"2026-11-10T11:39:43.268Z","event":"operation.settled","requestId":"preview-33","operation":"close","ok":true}
```

## C3 steps and timestamps

Before step times (UTC):

```jsonl
{"time":"2026-11-10T11:33:56.080Z","tool":"preview_open","caller":0,"args":{"reuseExistingTab":false,"open":false}}
{"time":"2026-11-10T11:33:56.218Z","tool":"preview_recording_start","caller":0,"args":{"tabId":"tab_b_bea12b60-c14f-4580-bb58-2b38123bd480"}}
{"time":"2026-11-10T11:33:57.904Z","tool":"preview_set_appearance","caller":0,"args":{"tabId":"tab_b_bea12b60-c14f-4580-bb58-2b38123bd480","colorScheme":"dark"}}
{"time":"2026-11-10T11:34:15.428Z","tool":"preview_status","caller":0,"args":{"tabId":"tab_b_bea12b60-c14f-4580-bb58-2b38123bd480"}}
{"time":"2026-11-10T11:34:15.439Z","tool":"preview_open","caller":0,"args":{"tabId":"tab_b_bea12b60-c14f-4580-bb58-2b38123bd480","reuseExistingTab":true,"open":false}}
{"time":"2026-11-10T11:34:15.439Z","tool":"preview_recording_stop","caller":0,"args":{"tabId":"tab_b_bea12b60-c14f-4580-bb58-2b38123bd480"}}
{"time":"2026-11-10T11:36:18.113Z","tool":"preview_recording_stop","caller":0,"args":{"tabId":"tab_b_bea12b60-c14f-4580-bb58-2b38123bd480"}}
{"time":"2026-11-10T11:36:18.247Z","tool":"preview_dialog","caller":0,"args":{"tabId":"tab_b_bea12b60-c14f-4580-bb58-2b38123bd480","accept":true}}
{"time":"2026-11-10T11:36:18.598Z","tool":"preview_recording_stop","caller":0,"args":{"tabId":"tab_b_bea12b60-c14f-4580-bb58-2b38123bd480"}}
{"time":"2026-11-10T11:36:18.816Z","tool":"t3_preview_close","caller":0,"args":{"tabId":"tab_b_bea12b60-c14f-4580-bb58-2b38123bd480"}}
```

After step times (UTC):

```jsonl
{"time":"2026-11-10T11:33:55.565Z","tool":"preview_open","caller":0,"args":{"reuseExistingTab":false,"open":false}}
{"time":"2026-11-10T11:33:55.836Z","tool":"preview_recording_start","caller":0,"args":{"tabId":"tab_a_bd9d2d9d-727d-4676-b1e8-9554a31f1406"}}
{"time":"2026-11-10T11:33:58.000Z","tool":"preview_set_appearance","caller":0,"args":{"tabId":"tab_a_bd9d2d9d-727d-4676-b1e8-9554a31f1406","colorScheme":"dark"}}
{"time":"2026-11-10T11:34:15.023Z","tool":"preview_status","caller":0,"args":{"tabId":"tab_a_bd9d2d9d-727d-4676-b1e8-9554a31f1406"}}
{"time":"2026-11-10T11:34:15.037Z","tool":"preview_open","caller":0,"args":{"tabId":"tab_a_bd9d2d9d-727d-4676-b1e8-9554a31f1406","reuseExistingTab":true,"open":false}}
{"time":"2026-11-10T11:34:15.039Z","tool":"preview_recording_stop","caller":0,"args":{"tabId":"tab_a_bd9d2d9d-727d-4676-b1e8-9554a31f1406"}}
{"time":"2026-11-10T11:34:16.708Z","tool":"preview_recording_stop","caller":0,"args":{"tabId":"tab_a_bd9d2d9d-727d-4676-b1e8-9554a31f1406"}}
{"time":"2026-11-10T11:34:16.846Z","tool":"preview_dialog","caller":0,"args":{"tabId":"tab_a_bd9d2d9d-727d-4676-b1e8-9554a31f1406","accept":true}}
{"time":"2026-11-10T11:34:17.208Z","tool":"preview_recording_stop","caller":0,"args":{"tabId":"tab_a_bd9d2d9d-727d-4676-b1e8-9554a31f1406"}}
{"time":"2026-11-10T11:34:17.350Z","tool":"t3_preview_close","caller":0,"args":{"tabId":"tab_a_bd9d2d9d-727d-4676-b1e8-9554a31f1406"}}
```

<a id="before-c3"></a>
## Before — C3

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

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

```jsonl
{"time":"2026-11-10T11:33:56.217Z","tool":"preview_open","caller":0,"result":{"isError":false,"selectedStatusFields":{"available":true,"tabId":"tab_b_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_b_bea12b60-c14f-4580-bb58-2b38123bd480","owner":"agent","ownedByCaller":true}]}}}
{"time":"2026-11-10T11:33:57.810Z","tool":"preview_recording_start","caller":0,"result":{"isError":false,"structuredContent":{"tabId":"tab_b_bea12b60-c14f-4580-bb58-2b38123bd480","recording":true,"startedAt":"2026-11-10T11:33:57.803Z"}}}
{"time":"2026-11-10T11:34:13.925Z","tool":"preview_set_appearance","caller":0,"result":{"content":[{"type":"text","text":"Preview automation setColorScheme timed out after 15000ms."}],"isError":true}}
{"time":"2026-11-10T11:34:15.438Z","tool":"preview_status","caller":0,"result":{"isError":false,"selectedStatusFields":{"available":true,"tabId":"tab_b_bea12b60-c14f-4580-bb58-2b38123bd480","url":null,"loading":false,"control":{"owner":"agent","ownedByCaller":true,"generation":0},"dialog":{"type":"confirm","message":"Synthetic overdue dialog","defaultValue":""},"viewportSetting":{"_tag":"fill"},"viewport":{"width":1280,"height":800},"tabs":[{"tabId":"tab_b_bea12b60-c14f-4580-bb58-2b38123bd480","owner":"agent","ownedByCaller":true}]}}}
{"time":"2026-11-10T11:34:15.481Z","tool":"preview_open","caller":0,"result":{"content":[{"type":"text","text":"A browser dialog is pending. Read preview_status and resolve it with preview_dialog."}],"isError":true}}
{"time":"2026-11-10T11:36:16.482Z","tool":"preview_recording_stop","caller":0,"result":{"content":[{"type":"text","text":"Preview automation recordingStop timed out after 120000ms."}],"isError":true}}
{"time":"2026-11-10T11:36:18.133Z","tool":"preview_recording_stop","caller":0,"result":{"content":[{"type":"text","text":"A human controls this browser tab. Wait until they release control."}],"isError":true}}
{"time":"2026-11-10T11:36:18.274Z","tool":"preview_dialog","caller":0,"result":{"isError":false,"selectedStatusFields":{"available":true,"tabId":"tab_b_bea12b60-c14f-4580-bb58-2b38123bd480","url":null,"loading":false,"control":{"owner":"agent","ownedByCaller":true,"generation":2},"dialog":null,"viewportSetting":{"_tag":"fill"},"viewport":{"width":1280,"height":800},"tabs":[{"tabId":"tab_b_bea12b60-c14f-4580-bb58-2b38123bd480","owner":"agent","ownedByCaller":true}]}}}
{"time":"2026-11-10T11:36:18.815Z","tool":"preview_recording_stop","caller":0,"result":{"isError":false,"structuredContent":{"id":"f41bc889-9c75-40ee-b7a0-6866bd924e3e-f2ededdd-29e3-4f5d-a5e7-00f359f20907-mp4","tabId":"tab_b_bea12b60-c14f-4580-bb58-2b38123bd480","path":"/home/user/wt/pr-32866-cap-before/.t3/userdata/attachments/f41bc889-9c75-40ee-b7a0-6866bd924e3e-f2ededdd-29e3-4f5d-a5e7-00f359f20907-mp4.mp4","mimeType":"video/mp4","sizeBytes":32320,"createdAt":"2026-11-10T11:36:18.801Z"}}}
{"time":"2026-11-10T11:36:18.836Z","tool":"t3_preview_close","caller":0,"result":{"isError":false,"structuredContent":{}}}
```

Relevant server milestones:

```jsonl
{"time":"2026-11-10T11:33:31.443Z","event":"host.connected","connectionId":"c9837c85-e742-42f3-8ee0-9a6034906f74"}
{"time":"2026-11-10T11:33:56.092Z","event":"request.start","operation":"open","requestId":"preview-92","tabId":"tab_a_bea12b60-c14f-4580-bb58-2b38123bd480","timeoutMs":660000,"connectionId":"c9837c85-e742-42f3-8ee0-9a6034906f74"}
{"time":"2026-11-10T11:33:56.198Z","tabId":"tab_b_bea12b60-c14f-4580-bb58-2b38123bd480","event":"tab.created","detail":{"desktop":false,"isolatedContext":true}}
{"time":"2026-11-10T11:33:56.230Z","event":"request.start","operation":"recordingStart","requestId":"preview-93","tabId":"tab_b_bea12b60-c14f-4580-bb58-2b38123bd480","timeoutMs":15000,"connectionId":"c9837c85-e742-42f3-8ee0-9a6034906f74"}
{"time":"2026-11-10T11:33:57.920Z","event":"request.start","operation":"setColorScheme","requestId":"preview-95","tabId":"tab_b_bea12b60-c14f-4580-bb58-2b38123bd480","timeoutMs":15000,"connectionId":"c9837c85-e742-42f3-8ee0-9a6034906f74"}
{"time":"2026-11-10T11:33:57.920Z","tabId":"tab_b_bea12b60-c14f-4580-bb58-2b38123bd480","event":"emulateMedia.start","detail":[{"colorScheme":"dark"}]}
{"time":"2026-11-10T11:34:14.923Z","event":"host.connected","connectionId":"2ec85815-d1bb-44dd-8f96-e22608c1393d"}
{"time":"2026-11-10T11:34:15.434Z","event":"request.start","operation":"status","requestId":"preview-96","tabId":"tab_b_bea12b60-c14f-4580-bb58-2b38123bd480","timeoutMs":15000,"connectionId":"2ec85815-d1bb-44dd-8f96-e22608c1393d"}
{"time":"2026-11-10T11:34:15.473Z","event":"request.start","operation":"open","requestId":"preview-99","tabId":"tab_b_bea12b60-c14f-4580-bb58-2b38123bd480","timeoutMs":660000,"connectionId":"2ec85815-d1bb-44dd-8f96-e22608c1393d"}
{"time":"2026-11-10T11:34:15.476Z","event":"request.start","operation":"recordingStop","requestId":"preview-100","tabId":"tab_b_bea12b60-c14f-4580-bb58-2b38123bd480","timeoutMs":120000,"connectionId":"2ec85815-d1bb-44dd-8f96-e22608c1393d"}
{"time":"2026-11-10T11:36:17.480Z","event":"host.connected","connectionId":"a2081acc-a298-4cfd-9325-25a29388bdc3"}
{"time":"2026-11-10T11:36:18.129Z","event":"request.start","operation":"recordingStop","requestId":"preview-103","tabId":"tab_b_bea12b60-c14f-4580-bb58-2b38123bd480","timeoutMs":120000,"connectionId":"a2081acc-a298-4cfd-9325-25a29388bdc3"}
{"time":"2026-11-10T11:36:18.260Z","event":"request.start","operation":"dialog","requestId":"preview-105","tabId":"tab_b_bea12b60-c14f-4580-bb58-2b38123bd480","timeoutMs":15000,"connectionId":"a2081acc-a298-4cfd-9325-25a29388bdc3"}
{"time":"2026-11-10T11:36:18.271Z","tabId":"tab_b_bea12b60-c14f-4580-bb58-2b38123bd480","event":"emulateMedia.end","detail":{}}
{"time":"2026-11-10T11:36:18.612Z","event":"request.start","operation":"recordingStop","requestId":"preview-109","tabId":"tab_b_bea12b60-c14f-4580-bb58-2b38123bd480","timeoutMs":120000,"connectionId":"a2081acc-a298-4cfd-9325-25a29388bdc3"}
{"time":"2026-11-10T11:36:18.679Z","event":"recording.stop.start","tabId":"tab_b_bea12b60-c14f-4580-bb58-2b38123bd480"}
{"time":"2026-11-10T11:36:18.800Z","event":"recording.encoder.closed","tabId":"tab_b_bea12b60-c14f-4580-bb58-2b38123bd480"}
{"time":"2026-11-10T11:36:18.829Z","event":"request.start","operation":"close","requestId":"preview-111","tabId":"tab_b_bea12b60-c14f-4580-bb58-2b38123bd480","timeoutMs":15000,"connectionId":"a2081acc-a298-4cfd-9325-25a29388bdc3"}
```

<a id="after-c3"></a>
## After — C3

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

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

```jsonl
{"time":"2026-11-10T11:33:55.835Z","tool":"preview_open","caller":0,"result":{"isError":false,"selectedStatusFields":{"available":true,"tabId":"tab_a_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_a_bd9d2d9d-727d-4676-b1e8-9554a31f1406","owner":"agent","ownedByCaller":true}]}}}
{"time":"2026-11-10T11:33:57.863Z","tool":"preview_recording_start","caller":0,"result":{"isError":false,"structuredContent":{"tabId":"tab_a_bd9d2d9d-727d-4676-b1e8-9554a31f1406","recording":true,"startedAt":"2026-11-10T11:33:57.851Z"}}}
{"time":"2026-11-10T11:34:13.521Z","tool":"preview_set_appearance","caller":0,"result":{"content":[{"type":"text","text":"Preview automation setColorScheme timed out after 15000ms."}],"isError":true}}
{"time":"2026-11-10T11:34:15.036Z","tool":"preview_status","caller":0,"result":{"isError":false,"selectedStatusFields":{"available":true,"tabId":"tab_a_bd9d2d9d-727d-4676-b1e8-9554a31f1406","url":null,"loading":false,"control":{"owner":"agent","ownedByCaller":true,"generation":0},"dialog":{"type":"confirm","message":"Synthetic overdue dialog","defaultValue":""},"viewportSetting":{"_tag":"fill"},"viewport":{"width":1280,"height":800},"tabs":[{"tabId":"tab_a_bd9d2d9d-727d-4676-b1e8-9554a31f1406","owner":"agent","ownedByCaller":true}]}}}
{"time":"2026-11-10T11:34:15.076Z","tool":"preview_open","caller":0,"result":{"content":[{"type":"text","text":"A browser dialog is pending. Read preview_status and resolve it with preview_dialog."}],"isError":true}}
{"time":"2026-11-10T11:34:15.083Z","tool":"preview_recording_stop","caller":0,"result":{"content":[{"type":"text","text":"A browser dialog is pending. Read preview_status and resolve it with preview_dialog."}],"isError":true}}
{"time":"2026-11-10T11:34:16.727Z","tool":"preview_recording_stop","caller":0,"result":{"content":[{"type":"text","text":"A human controls this browser tab. Wait until they release control."}],"isError":true}}
{"time":"2026-11-10T11:34:16.872Z","tool":"preview_dialog","caller":0,"result":{"isError":false,"selectedStatusFields":{"available":true,"tabId":"tab_a_bd9d2d9d-727d-4676-b1e8-9554a31f1406","url":null,"loading":false,"control":{"owner":"agent","ownedByCaller":true,"generation":2},"dialog":null,"viewportSetting":{"_tag":"fill"},"viewport":{"width":1280,"height":800},"tabs":[{"tabId":"tab_a_bd9d2d9d-727d-4676-b1e8-9554a31f1406","owner":"agent","ownedByCaller":true}]}}}
{"time":"2026-11-10T11:34:17.348Z","tool":"preview_recording_stop","caller":0,"result":{"isError":false,"structuredContent":{"id":"100ee364-0c8a-4d22-8790-3614885b473c-ae85df61-3e0f-404e-a006-85521d22eace-mp4","tabId":"tab_a_bd9d2d9d-727d-4676-b1e8-9554a31f1406","path":"/home/user/wt/pr-32866-cap-after/.t3/userdata/attachments/100ee364-0c8a-4d22-8790-3614885b473c-ae85df61-3e0f-404e-a006-85521d22eace-mp4.mp4","mimeType":"video/mp4","sizeBytes":32344,"createdAt":"2026-11-10T11:34:17.337Z"}}}
{"time":"2026-11-10T11:34:17.368Z","tool":"t3_preview_close","caller":0,"result":{"isError":false,"structuredContent":{}}}
```

Relevant server milestones:

```jsonl
{"time":"2026-11-10T11:29:29.949Z","event":"host.connected","connectionId":"09b81d2d-300e-436a-8035-a1f18530f0d1"}
{"time":"2026-11-10T11:33:55.576Z","event":"request.start","operation":"open","requestId":"preview-76","tabId":"tab_9_bd9d2d9d-727d-4676-b1e8-9554a31f1406","timeoutMs":660000,"connectionId":"09b81d2d-300e-436a-8035-a1f18530f0d1"}
{"time":"2026-11-10T11:33:55.823Z","tabId":"tab_a_bd9d2d9d-727d-4676-b1e8-9554a31f1406","event":"tab.created","detail":{"desktop":false,"isolatedContext":true}}
{"time":"2026-11-10T11:33:55.849Z","event":"request.start","operation":"recordingStart","requestId":"preview-77","tabId":"tab_a_bd9d2d9d-727d-4676-b1e8-9554a31f1406","timeoutMs":15000,"connectionId":"09b81d2d-300e-436a-8035-a1f18530f0d1"}
{"time":"2026-11-10T11:33:58.016Z","event":"request.start","operation":"setColorScheme","requestId":"preview-79","tabId":"tab_a_bd9d2d9d-727d-4676-b1e8-9554a31f1406","timeoutMs":15000,"connectionId":"09b81d2d-300e-436a-8035-a1f18530f0d1"}
{"time":"2026-11-10T11:33:58.016Z","tabId":"tab_a_bd9d2d9d-727d-4676-b1e8-9554a31f1406","event":"emulateMedia.start","detail":[{"colorScheme":"dark"}]}
{"time":"2026-11-10T11:34:15.030Z","event":"request.start","operation":"status","requestId":"preview-80","tabId":"tab_a_bd9d2d9d-727d-4676-b1e8-9554a31f1406","timeoutMs":15000,"connectionId":"09b81d2d-300e-436a-8035-a1f18530f0d1"}
{"time":"2026-11-10T11:34:15.072Z","event":"request.start","operation":"open","requestId":"preview-83","tabId":"tab_a_bd9d2d9d-727d-4676-b1e8-9554a31f1406","timeoutMs":660000,"connectionId":"09b81d2d-300e-436a-8035-a1f18530f0d1"}
{"time":"2026-11-10T11:34:15.076Z","event":"request.start","operation":"recordingStop","requestId":"preview-84","tabId":"tab_a_bd9d2d9d-727d-4676-b1e8-9554a31f1406","timeoutMs":120000,"connectionId":"09b81d2d-300e-436a-8035-a1f18530f0d1"}
{"time":"2026-11-10T11:34:16.723Z","event":"request.start","operation":"recordingStop","requestId":"preview-87","tabId":"tab_a_bd9d2d9d-727d-4676-b1e8-9554a31f1406","timeoutMs":120000,"connectionId":"09b81d2d-300e-436a-8035-a1f18530f0d1"}
{"time":"2026-11-10T11:34:16.861Z","event":"request.start","operation":"dialog","requestId":"preview-89","tabId":"tab_a_bd9d2d9d-727d-4676-b1e8-9554a31f1406","timeoutMs":15000,"connectionId":"09b81d2d-300e-436a-8035-a1f18530f0d1"}
{"time":"2026-11-10T11:34:16.868Z","tabId":"tab_a_bd9d2d9d-727d-4676-b1e8-9554a31f1406","event":"emulateMedia.end","detail":{}}
{"time":"2026-11-10T11:34:17.216Z","event":"request.start","operation":"recordingStop","requestId":"preview-93","tabId":"tab_a_bd9d2d9d-727d-4676-b1e8-9554a31f1406","timeoutMs":120000,"connectionId":"09b81d2d-300e-436a-8035-a1f18530f0d1"}
{"time":"2026-11-10T11:34:17.218Z","event":"recording.stop.start","tabId":"tab_a_bd9d2d9d-727d-4676-b1e8-9554a31f1406"}
{"time":"2026-11-10T11:34:17.305Z","event":"recording.encoder.closed","tabId":"tab_a_bd9d2d9d-727d-4676-b1e8-9554a31f1406"}
{"time":"2026-11-10T11:34:17.362Z","event":"request.start","operation":"close","requestId":"preview-95","tabId":"tab_a_bd9d2d9d-727d-4676-b1e8-9554a31f1406","timeoutMs":15000,"connectionId":"09b81d2d-300e-436a-8035-a1f18530f0d1"}
```

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