Xcode: open reported 'host closed the connection' but worked; Organizer window inventory and AX tree incomplete

Two things from driving Xcode 26's Organizer while uploading an archive to App Store Connect (2026-11-03):

desktop_open of an .xcarchive returned "host closed the connection", but Xcode opened the archive in the Organizer anyway. A later desktop_open of a second archive returned completed with created_windows: [] (it reused the Organizer window). The connection error suggests the action may not have happened, when it did.
Window inventory and inspection are partial for Xcode. desktop_open and desktop_windows report window_inventory_completeness: partial ("Accessibility window enrichment was incomplete; returning verified CG inventory") and observation_capability: unknown for the Archives window. Earlier in the same session, desktop_inspect of that window came back with an incomplete AX tree while the Distribute sheet was mid-flow ("Selecting account…", "Preparing"), and a pixel snapshot didn't show the sheet. Later inspections of the same window were complete.

Repro: with Xcode running and its Organizer closed, desktop_open an .xcarchive. Then desktop_inspect the Archives window while Distribute App → App Store Connect is preparing.

Fix train update:

"host closed the connection": this was the host crashing. Crash reports show HIToolbox asserting its queue in TSMGetInputSourceProperty, called off the main thread from Mac.systemState() (the app inventory). The same crash appears in 0.20.0 on 2026-11-07. Fixed in Host: keyboard layout read on the main thread; a call cut off mid-action is unknown (#244) #248, which also makes the MCP server report a connection lost mid-action as unknown (HOST_CONNECTION_LOST) instead of a plain error.
Incomplete AX tree right after a sheet appears: Sheets: confirm clicks that open or close a sheet, route agents to the parent window (#243, #245) #247 retries the follow-up observation once. It also handles Distribute-style sheet open and close clicks (Xcode Organizer: clicks that open or close a sheet report unknown (retry_safety unsafe) although they took effect #243) and the sheet routing (Sheets: desktop_windows sends agents to a pixels-only window; the working AXSheet is only in the parent, whose screenshot omits it #245).
Not reproduced: Xcode's inventory_completeness: partial / "Accessibility window enrichment was incomplete" while Distribute is preparing. That warning means Accessibility returned errors partway through reading Xcode's windows, which fits Xcode being busy. Without an archive mid-distribution I couldn't reproduce it or tell whether a retry would help, so it's unchanged. If it happens again, the inventory_warnings and a verbose desktop_windows result would show which read failed.

Host: read the keyboard layout on the main thread; a call cut off mid…

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Xcode: open reported 'host closed the connection' but worked; Organizer window inventory and AX tree incomplete #244

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Xcode: open reported 'host closed the connection' but worked; Organizer window inventory and AX tree incomplete #244

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iamnbutler commented on Nov 12, 2026

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