PR 29205 real development verification
Browser: repository playwright-core with /usr/bin/google-chrome on Linux
Provider: Codex gpt-6.1-sol through local proxy
App-created project: /home/user/browser-verification (real git repository)
No mocks, fixtures, or replay provider.

main 30084f0018c5751a07291222e8d04e16d513700a
preview_status: owner=unclaimed, ownedByCaller=false, url=null
t3_preview_close: PreviewAutomationControlInterruptedError
reason=agentMismatch
cause.message="Only the agent session that opened this tab can close it."
t3_preview_list: original tab remains

PR fb27ca1594fc90b177dcc22b2f25a788515e88b7
preview_status: owner=unclaimed, ownedByCaller=false, url=null
t3_preview_close: PreviewAutomationControlInterruptedError
reason=unclaimedTab
cause.message="This tab has no agent owner. Ask the user to close it in the browser panel."
t3_preview_list: original tab remains
The message above was present in the JSON text actually delivered to Codex, and Codex reported it in the web client.

Neighbor: agent-owned close
preview_open {open:false,reuseExistingTab:false}: owner=agent, ownedByCaller=true
preview_status on returned tabId: owner=agent, ownedByCaller=true
t3_preview_close on agent tab: {}
t3_preview_list: agent tab removed; original unclaimed tab remains

Neighbor: user recovery
Clicked Close Browser in web client.
t3_preview_list through Codex: sessions=[]

Blacksmith focused tests:
vp test run apps/server/src/preview/ServerBrowser.test.ts apps/server/src/mcp/PreviewAutomationBroker.test.ts
2 files passed; 76 tests passed.