# Tab Cleanup
- Agent-created Chrome tabs are ephemeral and close automatically when the turn ends unless you mark them.
- Call `tab.markDeliverable()` when the live tab itself is a user-facing output or requested open page, such as a created or edited document, spreadsheet, slide deck, dashboard, checkout, submitted form result, or a page the user explicitly asked to keep open. Deliverable tabs are released from browser control and left open.
- Call `tab.markHandoff()` only when work must continue from the live page in a later turn, such as a page waiting for user input, login, approval, payment, CAPTCHA, or an unfinished workflow. Handoff tabs remain available for the next turn.
- Marks are turn-scoped and the latest mark for a tab wins. Mark a handoff tab again in a later turn if it must survive that turn too.
- Do not mark research, search, source, intermediate, duplicate, blank, error, or routine navigation tabs. Once you have extracted what you need, let automatic turn cleanup close them.
- Claimed user tabs that are not marked are released from browser-session control and left open.
