# R16 — Observer reads

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): While owner A is held, foreign session snapshot/waitFor A; repeat under human reservation and with the real pending confirm.

What differed: Foreign reads bypass the owner queue and succeed without a dialog; with a dialog they return dialogPending. Status is separately unqueued. The owning agent under human control receives humanControl.

## 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":"2026-11-10T11:41:23.139Z","tool":"preview_snapshot","caller":2,"args":{"tabId":"tab_1_1322bfd2-cca3-4137-992e-c9da3d086a36"}}
{"time":"2026-11-10T11:41:23.140Z","tool":"preview_wait_for","caller":2,"args":{"tabId":"tab_1_1322bfd2-cca3-4137-992e-c9da3d086a36","selector":"body","timeoutMs":1500}}
{"time":"2026-11-10T11:41:27.601Z","tool":"preview_status","caller":0,"args":{"tabId":"tab_1_1322bfd2-cca3-4137-992e-c9da3d086a36"}}
{"time":"2026-11-10T11:41:27.625Z","tool":"preview_snapshot","caller":0,"args":{"tabId":"tab_1_1322bfd2-cca3-4137-992e-c9da3d086a36"}}
{"time":"2026-11-10T11:41:27.630Z","tool":"preview_wait_for","caller":0,"args":{"tabId":"tab_1_1322bfd2-cca3-4137-992e-c9da3d086a36","selector":"body","timeoutMs":1500}}
{"time":"2026-11-10T11:41:27.634Z","tool":"preview_snapshot","caller":2,"args":{"tabId":"tab_1_1322bfd2-cca3-4137-992e-c9da3d086a36"}}
{"time":"2026-11-10T11:41:27.780Z","tool":"preview_wait_for","caller":2,"args":{"tabId":"tab_1_1322bfd2-cca3-4137-992e-c9da3d086a36","selector":"body","timeoutMs":1500}}
{"time":"2026-11-10T11:41:27.990Z","tool":"preview_status","caller":0,"args":{"tabId":"tab_1_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":"2026-11-10T11:39:40.666Z","tool":"preview_snapshot","caller":2,"args":{"tabId":"tab_1_b49bf147-bc21-4874-9243-25ceadea1fd3"}}
{"time":"2026-11-10T11:39:40.667Z","tool":"preview_wait_for","caller":2,"args":{"tabId":"tab_1_b49bf147-bc21-4874-9243-25ceadea1fd3","selector":"body","timeoutMs":1500}}
{"time":"2026-11-10T11:39:42.818Z","tool":"preview_status","caller":0,"args":{"tabId":"tab_1_b49bf147-bc21-4874-9243-25ceadea1fd3"}}
{"time":"2026-11-10T11:39:42.858Z","tool":"preview_snapshot","caller":0,"args":{"tabId":"tab_1_b49bf147-bc21-4874-9243-25ceadea1fd3"}}
{"time":"2026-11-10T11:39:42.875Z","tool":"preview_wait_for","caller":0,"args":{"tabId":"tab_1_b49bf147-bc21-4874-9243-25ceadea1fd3","selector":"body","timeoutMs":1500}}
{"time":"2026-11-10T11:39:42.885Z","tool":"preview_snapshot","caller":2,"args":{"tabId":"tab_1_b49bf147-bc21-4874-9243-25ceadea1fd3"}}
{"time":"2026-11-10T11:39:42.981Z","tool":"preview_wait_for","caller":2,"args":{"tabId":"tab_1_b49bf147-bc21-4874-9243-25ceadea1fd3","selector":"body","timeoutMs":1500}}
{"time":"2026-11-10T11:39:43.192Z","tool":"preview_status","caller":0,"args":{"tabId":"tab_1_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":"2026-11-10T11:41:23.365Z","tool":"preview_snapshot","caller":2,"result":{"isError":false,"structuredContent":{"url":"about:blank","title":"","loading":false,"visibleText":"","interactiveElements":[],"consoleEntries":[],"networkEntries":[],"actionTimeline":[],"screenshot":{"mimeType":"image/png","width":1280,"height":800},"accessibilityTree":""}}}
{"time":"2026-11-10T11:41:23.201Z","tool":"preview_wait_for","caller":2,"result":{"isError":false,"structuredContent":{}}}
{"time":"2026-11-10T11:41:27.609Z","tool":"preview_status","caller":0,"result":{"isError":false,"selectedStatusFields":{"available":true,"tabId":"tab_1_1322bfd2-cca3-4137-992e-c9da3d086a36","url":null,"loading":false,"control":{"owner":"human","ownedByCaller":true,"generation":1},"dialog":null,"viewportSetting":{"_tag":"fill"},"viewport":{"width":1280,"height":800},"tabs":[{"tabId":"tab_1_1322bfd2-cca3-4137-992e-c9da3d086a36","owner":"human","ownedByCaller":true},{"tabId":"tab_2_1322bfd2-cca3-4137-992e-c9da3d086a36","owner":"agent","ownedByCaller":true}]}}}
{"time":"2026-11-10T11:41:27.630Z","tool":"preview_snapshot","caller":0,"result":{"content":[{"type":"text","text":"Preview snapshot failed: A human controls this browser tab. Wait until they release control."}],"structuredContent":{"error":{"_tag":"PreviewAutomationControlInterruptedError","operation":"snapshot","failureCount":1,"message":"A human controls this browser tab. Wait until they release control."}},"isError":true}}
{"time":"2026-11-10T11:41:27.634Z","tool":"preview_wait_for","caller":0,"result":{"content":[{"type":"text","text":"A human controls this browser tab. Wait until they release control."}],"isError":true}}
{"time":"2026-11-10T11:41:27.780Z","tool":"preview_snapshot","caller":2,"result":{"isError":false,"structuredContent":{"url":"about:blank","title":"","loading":false,"visibleText":"","interactiveElements":[],"consoleEntries":[],"networkEntries":[],"actionTimeline":[],"screenshot":{"mimeType":"image/png","width":1280,"height":800},"accessibilityTree":""}}}
{"time":"2026-11-10T11:41:27.790Z","tool":"preview_wait_for","caller":2,"result":{"isError":false,"structuredContent":{}}}
{"time":"2026-11-10T11:41:27.998Z","tool":"preview_status","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":2},"dialog":null,"viewportSetting":{"_tag":"fill"},"viewport":{"width":1280,"height":800},"tabs":[{"tabId":"tab_1_1322bfd2-cca3-4137-992e-c9da3d086a36","owner":"agent","ownedByCaller":true},{"tabId":"tab_2_1322bfd2-cca3-4137-992e-c9da3d086a36","owner":"agent","ownedByCaller":true}]}}}
```

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":"snapshot","requestId":"preview-6","tabId":"tab_1_1322bfd2-cca3-4137-992e-c9da3d086a36","timeoutMs":15000,"connectionId":"b8744c25-255d-49da-99b2-c9b7d2fa21c8"}
{"time":"2026-11-10T11:41:23.153Z","event":"request.start","operation":"waitFor","requestId":"preview-7","tabId":"tab_1_1322bfd2-cca3-4137-992e-c9da3d086a36","timeoutMs":1500,"connectionId":"b8744c25-255d-49da-99b2-c9b7d2fa21c8"}
{"time":"2026-11-10T11:41:23.195Z","event":"operation.settled","requestId":"preview-7","operation":"waitFor","ok":true}
{"time":"2026-11-10T11:41:23.358Z","event":"operation.settled","requestId":"preview-6","operation":"snapshot","ok":true}
{"time":"2026-11-10T11:41:26.652Z","event":"host.connected","connectionId":"e4558845-047d-4489-8aed-1f3ec563d9e4"}
{"time":"2026-11-10T11:41:27.605Z","event":"request.start","operation":"status","requestId":"preview-20","tabId":"tab_1_1322bfd2-cca3-4137-992e-c9da3d086a36","timeoutMs":15000,"connectionId":"e4558845-047d-4489-8aed-1f3ec563d9e4"}
{"time":"2026-11-10T11:41:27.605Z","event":"operation.settled","requestId":"preview-20","operation":"status","ok":true}
{"time":"2026-11-10T11:41:27.627Z","event":"request.start","operation":"snapshot","requestId":"preview-23","tabId":"tab_1_1322bfd2-cca3-4137-992e-c9da3d086a36","timeoutMs":15000,"connectionId":"e4558845-047d-4489-8aed-1f3ec563d9e4"}
{"time":"2026-11-10T11:41:27.627Z","event":"operation.settled","requestId":"preview-23","operation":"snapshot","ok":false,"error":"BrowserControlInterrupted: A human controls this tab."}
{"time":"2026-11-10T11:41:27.632Z","event":"request.start","operation":"waitFor","requestId":"preview-24","tabId":"tab_1_1322bfd2-cca3-4137-992e-c9da3d086a36","timeoutMs":1500,"connectionId":"e4558845-047d-4489-8aed-1f3ec563d9e4"}
{"time":"2026-11-10T11:41:27.632Z","event":"operation.settled","requestId":"preview-24","operation":"waitFor","ok":false,"error":"BrowserControlInterrupted: A human controls this tab."}
{"time":"2026-11-10T11:41:27.638Z","event":"request.start","operation":"snapshot","requestId":"preview-25","tabId":"tab_1_1322bfd2-cca3-4137-992e-c9da3d086a36","timeoutMs":15000,"connectionId":"e4558845-047d-4489-8aed-1f3ec563d9e4"}
{"time":"2026-11-10T11:41:27.776Z","event":"operation.settled","requestId":"preview-25","operation":"snapshot","ok":true}
{"time":"2026-11-10T11:41:27.785Z","event":"request.start","operation":"waitFor","requestId":"preview-26","tabId":"tab_1_1322bfd2-cca3-4137-992e-c9da3d086a36","timeoutMs":1500,"connectionId":"e4558845-047d-4489-8aed-1f3ec563d9e4"}
{"time":"2026-11-10T11:41:27.787Z","event":"operation.settled","requestId":"preview-26","operation":"waitFor","ok":true}
{"time":"2026-11-10T11:41:27.994Z","event":"request.start","operation":"status","requestId":"preview-28","tabId":"tab_1_1322bfd2-cca3-4137-992e-c9da3d086a36","timeoutMs":15000,"connectionId":"e4558845-047d-4489-8aed-1f3ec563d9e4"}
{"time":"2026-11-10T11:41:27.994Z","event":"operation.settled","requestId":"preview-28","operation":"status","ok":true}
{"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":"2026-11-10T11:41:27.400Z","event":"viewer.send","type":"takeControl"}
{"time":"2026-11-10T11:41:27.401Z","event":"viewer.event","message":{"type":"control","canOperate":true,"controller":"agent","generation":0,"dialog":null}}
{"time":"2026-11-10T11:41:27.402Z","event":"viewer.event","message":{"type":"control","canOperate":true,"controller":"you","generation":1,"dialog":null}}
{"time":"2026-11-10T11:41:27.790Z","event":"viewer.send","type":"releaseControl"}
{"time":"2026-11-10T11:41:27.791Z","event":"viewer.event","message":{"type":"control","canOperate":true,"controller":"agent","generation":2,"dialog":null}}
```

<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":"2026-11-10T11:39:40.888Z","tool":"preview_snapshot","caller":2,"result":{"isError":false,"structuredContent":{"url":"about:blank","title":"","loading":false,"visibleText":"","interactiveElements":[],"consoleEntries":[],"networkEntries":[],"actionTimeline":[],"screenshot":{"mimeType":"image/png","width":1280,"height":800},"accessibilityTree":""}}}
{"time":"2026-11-10T11:39:40.754Z","tool":"preview_wait_for","caller":2,"result":{"isError":false,"structuredContent":{}}}
{"time":"2026-11-10T11:39:42.828Z","tool":"preview_status","caller":0,"result":{"isError":false,"selectedStatusFields":{"available":true,"tabId":"tab_1_b49bf147-bc21-4874-9243-25ceadea1fd3","url":null,"loading":false,"control":{"owner":"human","ownedByCaller":true,"generation":1},"dialog":null,"viewportSetting":{"_tag":"fill"},"viewport":{"width":1280,"height":800},"tabs":[{"tabId":"tab_1_b49bf147-bc21-4874-9243-25ceadea1fd3","owner":"human","ownedByCaller":true},{"tabId":"tab_2_b49bf147-bc21-4874-9243-25ceadea1fd3","owner":"agent","ownedByCaller":true}]}}}
{"time":"2026-11-10T11:39:42.875Z","tool":"preview_snapshot","caller":0,"result":{"content":[{"type":"text","text":"Preview snapshot failed: A human controls this browser tab. Wait until they release control."}],"structuredContent":{"error":{"_tag":"PreviewAutomationControlInterruptedError","operation":"snapshot","failureCount":1,"message":"A human controls this browser tab. Wait until they release control."}},"isError":true}}
{"time":"2026-11-10T11:39:42.885Z","tool":"preview_wait_for","caller":0,"result":{"content":[{"type":"text","text":"A human controls this browser tab. Wait until they release control."}],"isError":true}}
{"time":"2026-11-10T11:39:42.981Z","tool":"preview_snapshot","caller":2,"result":{"isError":false,"structuredContent":{"url":"about:blank","title":"","loading":false,"visibleText":"","interactiveElements":[],"consoleEntries":[],"networkEntries":[],"actionTimeline":[],"screenshot":{"mimeType":"image/png","width":1280,"height":800},"accessibilityTree":""}}}
{"time":"2026-11-10T11:39:42.991Z","tool":"preview_wait_for","caller":2,"result":{"isError":false,"structuredContent":{}}}
{"time":"2026-11-10T11:39:43.200Z","tool":"preview_status","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":2},"dialog":null,"viewportSetting":{"_tag":"fill"},"viewport":{"width":1280,"height":800},"tabs":[{"tabId":"tab_1_b49bf147-bc21-4874-9243-25ceadea1fd3","owner":"agent","ownedByCaller":true},{"tabId":"tab_2_b49bf147-bc21-4874-9243-25ceadea1fd3","owner":"agent","ownedByCaller":true}]}}}
```

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":"2026-11-10T11:39:40.693Z","event":"request.start","operation":"snapshot","requestId":"preview-6","tabId":"tab_1_b49bf147-bc21-4874-9243-25ceadea1fd3","timeoutMs":15000,"connectionId":"61893f52-5b7b-45e6-b0a0-72e49d4ebf16"}
{"time":"2026-11-10T11:39:40.695Z","event":"request.start","operation":"waitFor","requestId":"preview-7","tabId":"tab_1_b49bf147-bc21-4874-9243-25ceadea1fd3","timeoutMs":1500,"connectionId":"61893f52-5b7b-45e6-b0a0-72e49d4ebf16"}
{"time":"2026-11-10T11:39:40.749Z","event":"operation.settled","requestId":"preview-7","operation":"waitFor","ok":true}
{"time":"2026-11-10T11:39:40.877Z","event":"operation.settled","requestId":"preview-6","operation":"snapshot","ok":true}
{"time":"2026-11-10T11:39:42.823Z","event":"request.start","operation":"status","requestId":"preview-20","tabId":"tab_1_b49bf147-bc21-4874-9243-25ceadea1fd3","timeoutMs":15000,"connectionId":"61893f52-5b7b-45e6-b0a0-72e49d4ebf16"}
{"time":"2026-11-10T11:39:42.823Z","event":"operation.settled","requestId":"preview-20","operation":"status","ok":true}
{"time":"2026-11-10T11:39:42.864Z","event":"request.start","operation":"snapshot","requestId":"preview-23","tabId":"tab_1_b49bf147-bc21-4874-9243-25ceadea1fd3","timeoutMs":15000,"connectionId":"61893f52-5b7b-45e6-b0a0-72e49d4ebf16"}
{"time":"2026-11-10T11:39:42.864Z","event":"operation.settled","requestId":"preview-23","operation":"snapshot","ok":false,"error":"BrowserControlInterrupted: A human controls this tab."}
{"time":"2026-11-10T11:39:42.880Z","event":"request.start","operation":"waitFor","requestId":"preview-24","tabId":"tab_1_b49bf147-bc21-4874-9243-25ceadea1fd3","timeoutMs":1500,"connectionId":"61893f52-5b7b-45e6-b0a0-72e49d4ebf16"}
{"time":"2026-11-10T11:39:42.881Z","event":"operation.settled","requestId":"preview-24","operation":"waitFor","ok":false,"error":"BrowserControlInterrupted: A human controls this tab."}
{"time":"2026-11-10T11:39:42.889Z","event":"request.start","operation":"snapshot","requestId":"preview-25","tabId":"tab_1_b49bf147-bc21-4874-9243-25ceadea1fd3","timeoutMs":15000,"connectionId":"61893f52-5b7b-45e6-b0a0-72e49d4ebf16"}
{"time":"2026-11-10T11:39:42.977Z","event":"operation.settled","requestId":"preview-25","operation":"snapshot","ok":true}
{"time":"2026-11-10T11:39:42.984Z","event":"request.start","operation":"waitFor","requestId":"preview-26","tabId":"tab_1_b49bf147-bc21-4874-9243-25ceadea1fd3","timeoutMs":1500,"connectionId":"61893f52-5b7b-45e6-b0a0-72e49d4ebf16"}
{"time":"2026-11-10T11:39:42.987Z","event":"operation.settled","requestId":"preview-26","operation":"waitFor","ok":true}
{"time":"2026-11-10T11:39:43.196Z","event":"request.start","operation":"status","requestId":"preview-28","tabId":"tab_1_b49bf147-bc21-4874-9243-25ceadea1fd3","timeoutMs":15000,"connectionId":"61893f52-5b7b-45e6-b0a0-72e49d4ebf16"}
{"time":"2026-11-10T11:39:43.197Z","event":"operation.settled","requestId":"preview-28","operation":"status","ok":true}
{"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":"2026-11-10T11:39:42.617Z","event":"viewer.send","type":"takeControl"}
{"time":"2026-11-10T11:39:42.619Z","event":"viewer.event","message":{"type":"control","canOperate":true,"controller":"agent","generation":0,"dialog":null}}
{"time":"2026-11-10T11:39:42.621Z","event":"viewer.event","message":{"type":"control","canOperate":true,"controller":"you","generation":1,"dialog":null}}
{"time":"2026-11-10T11:39:42.992Z","event":"viewer.send","type":"releaseControl"}
{"time":"2026-11-10T11:39:42.992Z","event":"viewer.event","message":{"type":"control","canOperate":true,"controller":"agent","generation":2,"dialog":null}}
```

## 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":"2026-11-10T11:34:15.440Z","tool":"preview_snapshot","caller":2,"args":{"tabId":"tab_b_bea12b60-c14f-4580-bb58-2b38123bd480"}}
{"time":"2026-11-10T11:34:15.440Z","tool":"preview_wait_for","caller":2,"args":{"tabId":"tab_b_bea12b60-c14f-4580-bb58-2b38123bd480","selector":"body","timeoutMs":1000}}
{"time":"2026-11-10T11:36:18.247Z","tool":"preview_dialog","caller":0,"args":{"tabId":"tab_b_bea12b60-c14f-4580-bb58-2b38123bd480","accept":true}}
```

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_snapshot","caller":2,"args":{"tabId":"tab_a_bd9d2d9d-727d-4676-b1e8-9554a31f1406"}}
{"time":"2026-11-10T11:34:15.042Z","tool":"preview_wait_for","caller":2,"args":{"tabId":"tab_a_bd9d2d9d-727d-4676-b1e8-9554a31f1406","selector":"body","timeoutMs":1000}}
{"time":"2026-11-10T11:34:16.846Z","tool":"preview_dialog","caller":0,"args":{"tabId":"tab_a_bd9d2d9d-727d-4676-b1e8-9554a31f1406","accept":true}}
```

<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":"2026-11-10T11:34:15.467Z","tool":"preview_snapshot","caller":2,"result":{"content":[{"type":"text","text":"Preview snapshot failed: A browser dialog is pending. Read preview_status and resolve it with preview_dialog."}],"structuredContent":{"error":{"_tag":"PreviewAutomationControlInterruptedError","operation":"snapshot","failureCount":1,"message":"A browser dialog is pending. Read preview_status and resolve it with preview_dialog."}},"isError":true}}
{"time":"2026-11-10T11:34:15.469Z","tool":"preview_wait_for","caller":2,"result":{"content":[{"type":"text","text":"A browser dialog is pending. Read preview_status and resolve it with preview_dialog."}],"isError":true}}
{"time":"2026-11-10T11:36:18.274Z","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}]}}}
```

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":"2026-11-10T11:34:15.461Z","event":"request.start","operation":"snapshot","requestId":"preview-97","tabId":"tab_b_bea12b60-c14f-4580-bb58-2b38123bd480","timeoutMs":15000,"connectionId":"2ec85815-d1bb-44dd-8f96-e22608c1393d"}
{"time":"2026-11-10T11:34:15.462Z","event":"request.start","operation":"waitFor","requestId":"preview-98","tabId":"tab_b_bea12b60-c14f-4580-bb58-2b38123bd480","timeoutMs":1000,"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":"2026-11-10T11:36:17.480Z","event":"host.connected","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":"2026-11-10T11:33:57.905Z","event":"viewer.event","message":{"type":"control","canOperate":true,"controller":"agent","generation":0,"dialog":null}}
{"time":"2026-11-10T11:33:57.935Z","event":"viewer.event","message":{"type":"control","canOperate":true,"controller":"agent","generation":0,"dialog":{"type":"confirm","message":"Synthetic overdue dialog","defaultValue":""}}}
{"time":"2026-11-10T11:36:17.985Z","event":"viewer.send","type":"takeControl"}
{"time":"2026-11-10T11:36:17.987Z","event":"viewer.event","message":{"type":"control","canOperate":true,"controller":"you","generation":1,"dialog":{"type":"confirm","message":"Synthetic overdue dialog","defaultValue":""}}}
{"time":"2026-11-10T11:36:18.146Z","event":"viewer.send","type":"releaseControl"}
{"time":"2026-11-10T11:36:18.147Z","event":"viewer.event","message":{"type":"control","canOperate":true,"controller":"agent","generation":2,"dialog":{"type":"confirm","message":"Synthetic overdue dialog","defaultValue":""}}}
{"time":"2026-11-10T11:36:18.265Z","event":"viewer.event","message":{"type":"control","canOperate":true,"controller":"agent","generation":2,"dialog":null}}
{"time":"2026-11-10T11:36:18.274Z","event":"viewer.event","message":{"type":"control","canOperate":true,"controller":"agent","generation":2,"dialog":null}}
```

<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":"2026-11-10T11:34:15.070Z","tool":"preview_snapshot","caller":2,"result":{"content":[{"type":"text","text":"Preview snapshot failed: A browser dialog is pending. Read preview_status and resolve it with preview_dialog."}],"structuredContent":{"error":{"_tag":"PreviewAutomationControlInterruptedError","operation":"snapshot","failureCount":1,"message":"A browser dialog is pending. Read preview_status and resolve it with preview_dialog."}},"isError":true}}
{"time":"2026-11-10T11:34:15.071Z","tool":"preview_wait_for","caller":2,"result":{"content":[{"type":"text","text":"A browser dialog is pending. Read preview_status and resolve it with preview_dialog."}],"isError":true}}
{"time":"2026-11-10T11:34:16.872Z","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}]}}}
```

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":"2026-11-10T11:34:15.063Z","event":"request.start","operation":"snapshot","requestId":"preview-81","tabId":"tab_a_bd9d2d9d-727d-4676-b1e8-9554a31f1406","timeoutMs":15000,"connectionId":"09b81d2d-300e-436a-8035-a1f18530f0d1"}
{"time":"2026-11-10T11:34:15.066Z","event":"request.start","operation":"waitFor","requestId":"preview-82","tabId":"tab_a_bd9d2d9d-727d-4676-b1e8-9554a31f1406","timeoutMs":1000,"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":"2026-11-10T11:34:16.861Z","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":"2026-11-10T11:33:58.002Z","event":"viewer.event","message":{"type":"control","canOperate":true,"controller":"agent","generation":0,"dialog":null}}
{"time":"2026-11-10T11:33:58.026Z","event":"viewer.event","message":{"type":"control","canOperate":true,"controller":"agent","generation":0,"dialog":{"type":"confirm","message":"Synthetic overdue dialog","defaultValue":""}}}
{"time":"2026-11-10T11:34:16.583Z","event":"viewer.send","type":"takeControl"}
{"time":"2026-11-10T11:34:16.584Z","event":"viewer.event","message":{"type":"control","canOperate":true,"controller":"you","generation":1,"dialog":{"type":"confirm","message":"Synthetic overdue dialog","defaultValue":""}}}
{"time":"2026-11-10T11:34:16.743Z","event":"viewer.send","type":"releaseControl"}
{"time":"2026-11-10T11:34:16.745Z","event":"viewer.event","message":{"type":"control","canOperate":true,"controller":"agent","generation":2,"dialog":{"type":"confirm","message":"Synthetic overdue dialog","defaultValue":""}}}
{"time":"2026-11-10T11:34:16.866Z","event":"viewer.event","message":{"type":"control","canOperate":true,"controller":"agent","generation":2,"dialog":null}}
{"time":"2026-11-10T11:34:16.869Z","event":"viewer.event","message":{"type":"control","canOperate":true,"controller":"agent","generation":2,"dialog":null}}
```

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