[BUG] Sub-agent row in session tree is not clickable/openable while the task is still running

[talha7k]

Description

In the session tree, when an agent spawns a sub-agent, the sub-agent row appears but cannot be clicked/opened to view its output until the task completes. You have to wait for the entire sub-agent task to finish before the row becomes interactive.

Current behavior

1. Agent spawns a sub-agent → sub-agent row appears in the session tree
2. Click on the sub-agent row while it's still running → nothing happens / row is not responsive
3. Wait for the sub-agent task to complete
4. Now the row is clickable and opens the sub-agent window

Expected behavior

The sub-agent row should be clickable/openable immediately when it appears, even while the task is still running. Users should be able to view the sub-agent's progress, output, and intermediate results in real-time — similar to how you can watch a running task's output in the main session.

Why this matters

• Users want to monitor sub-agent progress without waiting for completion
• Long-running sub-agent tasks make it feel like the UI is frozen/broken
• Not being able to observe running sub-agents defeats the purpose of parallel task delegation

OpenCode version

1.4.x

Operating System

macOS

Terminal

Any