Collapse automation and agent-to-agent messages more aggressively by default #22413

Problem

Automation and agent-to-agent messages fill the chat history with large blocks of text that I rarely want to read. Frequent status updates and coordination messages take up substantial space, making it harder to scroll through the conversation and find the parts I care about.

This specifically concerns messages sent between full, top-level T3 threads and messages sent by automations. T3’s built-in subagent system already keeps child threads tucked away more effectively and handles their messages differently. That behavior doesn’t address the clutter caused by full threads communicating with each other.

On desktop, long messages are truncated behind “Show full message,” but the preview is still large. On Android, they aren’t collapsed at all, so the clutter is worse.

Requested behavior

Show automation and thread-to-thread messages as compact entries by default, ideally a single line showing the source and a short preview. Let me expand an entry when I want to read the full message.

Apply this consistently across desktop, web, and mobile.

Related discussions

• #18017: Hide agent-to-agent threads addresses sidebar clutter and snoozing. This request concerns clutter within the chat history.
• #6908: Attributed external-agent messages addresses attribution and publishing external results. This request concerns how much space those messages occupy.