Codex Desktop: completed Stop hook details open empty instead of showing hook result

What happened?

In recent Codex Desktop builds on macOS, the completed Stop hook result is no longer visible to the user/developer.

After an agent response finishes, Codex shows a hook indicator/button at the end of the response. Previously, the user could inspect the Stop hook result/final report from that UI surface. Currently, clicking the hook button opens nothing useful / an empty details view, so the user cannot see the hook's final report.

This is specifically about the user-visible UI artifact for a completed hook run. It is not a request to inject the hook output into the main agent/model context. Hook output should remain inspectable by the human operator without becoming part of the next model turn.

Why this matters

Stop hooks are often used for post-run checks, review gates, or handoff/report generation. The final hook result is intended for the user/developer to inspect after the agent response completes. If the details panel is empty, the hook can still run but the human loses the report/status surface.

Expected behavior

A completed Stop hook should have an inspectable UI detail surface that shows at least the hook's returned message/output, for example the returned systemMessage or equivalent hook result summary.

The hook result should remain UI-visible only and should not be inserted into the agent conversation/model context.

Actual behavior

The hook indicator/button appears at the end of the agent response, but clicking it does not show the Stop hook's final report/details.

Evidence from a local hook

The hook returns a valid Codex hook payload on stdout. In one recent run, the hook payload shape was produced from code equivalent to:

{
  "continue": true,
  "systemMessage": "review-validate-fix: <status>; reason=<reason_code>; summary=<summary_path>"
}

The corresponding local hook run also wrote its summary artifact successfully, for example:

{
  "status": "cline-kanban-unavailable",
  "reason_code": "cline_kanban_unavailable",
  "message": "CODEX_RVF_FORK_MODE=cline-kanban requires a readable parent transcript/session scope anchor; task was not started."
}

So this does not look like a missing hook result at the hook-process level. The missing piece appears to be the Codex Desktop UI surface that should display the completed hook result to the user.

Environment

• Platform: macOS
• Codex Desktop session metadata observed: originator: Codex Desktop, cli_version: 0.131.0-alpha.9
• Local codex --version: codex-cli 0.130.0
• Hook type: Stop

Related issues / distinction

This sounds related to the app/hooks area but is narrower than #21639. That issue reports hooks no longer running after a Desktop update. In this case, the hook appears to run and produce output/artifacts, but the completed hook result is no longer visible to the user from the Desktop UI.