macOS Computer Use: fresh Safari state succeeds, then coordinate click fails with -10005 noWindowsAvailable after app restart

Summary

On macOS, Computer Use can successfully return a fresh full screenshot and accessibility tree for the visible Safari window, and accessibility-index plus keyboard actions work, but a coordinate click derived from that same screenshot immediately fails with:

SkyComputerUseError: Computer Use server error -10005: noWindowsAvailable

The first occurrence was reproduced immediately after quitting and reopening the ChatGPT desktop app. A fresh reproduction about 30 hours later produced the same split-path result. The failure is not tied to a hidden, narrow, off-screen, or multi-display Safari window.

Environment

• ChatGPT desktop app: 26.727.40816 (bundle build 6067), bundle ID com.openai.codex
• Computer Use JS client: @oai/sky 0.6.2
• Signed helper: com.openai.sky.CUAService 26.727.1000550 (build 1000550), Developer ID team 2DC432GLL2; strict signature validation passed
• macOS: 26.5.1 (25F80), Apple Silicon arm64
• Active display topology: one built-in display, 1512 x 945 @ 120 Hz, main/online, CoreGraphics bounds (0,0) 1512x945
• Safari test window: one normal large window; screenshot 1386x768; no full-screen, Split View, tiling, negative position, or geometry recovery was required
• Helper count: 1 active SkyComputerUseService
• Main ChatGPT app-server direct node_repl children not belonging to this reproduction: 7 stale candidates, aged approximately 35 minutes to 28 hours at capture; none were killed
• System-wide node_repl: 9; stdio app-server: 2; SkyComputerUseClient mcp: 0
• Zombie processes: 0 system-wide, 0 under the ChatGPT GUI parent, 0 under its main app-server

Exact reproduction

1. Keep an existing normal Safari window open. Inventory all existing tabs; do not close or overwrite them.
2. Request a fresh full state:

``js
await sky.get_app_state({ app: "com.apple.Safari", disableDiff: true })
``

1. Confirm the response contains both a screenshot and accessibility tree for the same visible Safari window.
2. Choose a benign blank point inside the page viewport, away from browser chrome and site controls. In this run the first verified point was (865, 570).
3. Execute:

``js
await sky.click({ app: "com.apple.Safari", x: 865, y: 570 })
``

1. Observe the immediate exception:

``text
SkyComputerUseError: Computer Use server error -10005: noWindowsAvailable
``

The same error was reproduced at a second screenshot-verified page-content point (975, 250).

Recovery matrix

All six progressive recovery methods were completed without bypassing authentication, changing permissions, restarting Safari/WindowServer, or changing external state:

1. Waited, then fetched a fresh full Safari state: screenshot and accessibility tree succeeded; coordinate click failed -10005.
2. Pressed Escape to dismiss any overlay, then fetched a fresh full state: both succeeded; coordinate click failed -10005.
3. Captured and visually inspected a new screenshot from the large on-screen window, then used a new page-content coordinate: failed -10005.
4. Restored keyboard focus with Tab, then fetched a fresh full state: both succeeded; coordinate click failed -10005.
5. Opened the exact URL in one fresh task-owned tab, verified the same pre-existing signed-in account and loaded state, dismissed the account overlay, and fetched a fresh full state: coordinate click failed -10005.
6. Captured one final screenshot from the recovered task tab and made a final screenshot-guided page-content click: failed -10005.

The task-owned tab was closed afterward. Focus returned to the pre-existing Analytics tab, the window remained large, and the original two tabs remained open. No composer opened, no text was typed into a site, and no public action occurred.

Expected behavior

A coordinate action should resolve and target the same normal Safari window that the immediately preceding full-state request successfully captured. A healthy screenshot/accessibility request should not be followed by noWindowsAvailable for the same app/window.

Bounded diagnostic evidence

Client-side exception prefix:

SkyComputerUseError: Computer Use server error -10005: noWindowsAvailable
  at @oai/sky/.../targets/mac/native-pipe.js

A bounded unified-log query covering 2026-08-01 19:34:30–19:42:30 AEST for SkyComputerUseService, ChatGPT, ComputerUseIPC, noWindowsAvailable, timeoutReached, AccessibilitySupport, and ScreenCaptureKit returned no matching records. This is recorded as a zero-result query rather than expanding the collection window or attaching unrelated logs.

Official update observed locally

Sparkle has staged a correctly signed ChatGPT app update 26.727.51351 (bundle build 6119) while 26.727.40816 (build 6067) remains installed. The staged app still contains @oai/sky 0.6.2 and helper 26.727.1000550, identical to the installed Computer Use components. The update was not installed, copied, launched, or modified; its fix status is unknown.

Related reports

• #25744 — accumulated Computer Use/MCP helpers and WindowServer/TCC stalls
• #21668 — target-window/macOS Space mis-correlation
• #24301 — screenshots resolving to an unrelated target window

This report may share lifecycle or target-correlation code with those issues, but adds the deterministic state-success/action-failure split and the exact -10005 noWindowsAvailable result.