[BUG]: prompt-submit fail to grab session fails silently (web/app)

[DNGriffin]

Description

When you submit a message and the session fails to retrieve, the UX fails silently (no toast, console error, or failed request).

Multiple users have reported that when they send a message nothing happens, I reproed it myself. (it's hard to tell if we're all facing the same issue or if there are different variants because it fails silently)

Proposed fix i'm working on: toast a descriptive message when this happens

Screen.Recording.2026-02-07.at.9.35.37.PM.mov

Plugins

No response

OpenCode version

No response

Steps to reproduce

No response

Screenshot and/or share link

No response

Operating System

No response

Terminal

No response

[github-actions]

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

• Web UI: "Failed to send prompt" false alarm on mobile browsers — prompt succeeds but response stream breaks #12453: Web UI: "Failed to send prompt" false alarm on mobile browsers — prompt succeeds but response stream breaks

Feel free to ignore if none of these address your specific case.