Task child session can exist without metadata.sessionId after interruption, leaving web UI unable to show subagent activity

Description

When the Task tool spawns a child session, the child can already exist in /session/{parentID}/children, but the parent task part can still finish as interrupted/aborted without preserving metadata.sessionId.

In the Web UI this makes delegated work look silent/frozen, because the parent task card cannot follow the child session even though the child session already exists and may already contain messages.

This seems related to #21802 and #21979, but the specific issue here is the missing parent-child linkage metadata after interruption.

Plugins

None.

OpenCode version

1.4.2

Steps to reproduce

Start a normal Web UI session.
Let the main agent use the task tool to spawn a subagent.
Hit an interrupted/aborted path for that delegated task.
Compare the parent session timeline with GET /session/{parentID}/children.
Observe that the child session exists and may already contain messages, but the parent task part has no metadata.sessionId, so the Web UI cannot surface the delegated activity.

Screenshot and/or share link

No share link yet.

Example parent task state captured from a real session:

{
  "status": "error",
  "error": "Tool execution aborted",
  "metadata": {
    "interrupted": true
  }
}

Operating System

WSL Ubuntu 24.04 / Linux, using the Web UI in a browser

Terminal

Web UI (browser), not TUI / ACP

This issue doesn't fully meet our contributing guidelines.

What needs to be fixed:

This issue does not use one of the three required issue templates (Bug Report, Feature Request, or Question). Please re-submit or edit the issue using the appropriate template — in this case, the Bug Report template.

Please edit this issue to address the above within 2 hours, or it will be automatically closed.

This issue might be a duplicate of existing issues. Please check:

ACP clients cannot see subagent activity from Task tool #21802: ACP clients cannot see subagent activity from Task tool — also covers child session activity being invisible to clients, though from the ACP client angle rather than the interrupted metadata path specifically.
Wrapped stream error chunks bypass retry and can leave parent sessions waiting forever #21979: Wrapped stream error chunks can leave parent sessions waiting forever — related in that child streams can die without proper terminal state, leaving parent sessions in a broken state.

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Task child session can exist without metadata.sessionId after interruption, leaving web UI unable to show subagent activity #22348

Description

Plugins

OpenCode version

Steps to reproduce

Screenshot and/or share link

Operating System

Terminal

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Task child session can exist without metadata.sessionId after interruption, leaving web UI unable to show subagent activity #22348

Description

Description

Plugins

OpenCode version

Steps to reproduce

Screenshot and/or share link

Operating System

Terminal

Activity

github-actions commented on Apr 13, 2026

github-actions commented on Apr 13, 2026

github-actions commented on Jul 4, 2026

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