desktop: new sessions stay untitled, auto title not generated #59970

Summary

Sessions created in the OpenCode desktop app sometimes never get an auto-generated title and stay as session in the sidebar, even after dozens of messages. Manual /rename works, so only the automatic path appears broken.

Environment

• opencode version: 2.2.0 (desktop app, Electron 44.9.1)
• OS: Windows 11 (Windows_NT 10.0.26300, arm64)
• Terminal: OpenCode desktop app (no terminal attached; diagnostics run through the bundled CLI, TERM=xterm-256color)
• Shell: C:\Windows\system32\cmd.exe (commands executed with pwsh 7)
• Install/channel: latest, desktop installer (ai.opencode.desktop 2.2.0)
• Active plugins: none. Config only has the playwright MCP server plus experimental.todo: true

Reproduction

1. Open the desktop app and restart it so the background service reloads config.
2. Start a new session in a non-git directory (e.g. the drive root) and hold a multi-turn conversation.
3. Check the session name in the sidebar, or run opencode session export <id> and read info.title.

Expected Behavior

The session gets a short generated title (as the built-in title agent prompt describes: 3-5 words, same language as the message), like CLI-created sessions and like V1 sessions in the same install.

Actual Behavior

info.title stays empty and the sidebar shows Untitled session:

{
  "id": "ses_e7c7e4565ffeXN73eufSlQKida",
  "agent": "build",
  "outcome": "succeeded",
  "title": ""
}

Observed after 82 messages in that session. opencode session list renders it as Untitled session, while older sessions (created before the 2.2.0 upgrade) show proper titles.

Additional Context

• The title agent exists and is configured (opencode debug agents shows id: "title", hidden, with the "You name conversations..." system prompt), so the feature is present in this build.
• Manual renaming works: /rename with a value updates the session. /rename with an empty value is the only place session.title.generate(...) is referenced (in the CLI bundle).
• The desktop bundle (resources/app.asar, 2.2.0) contains zero references to title.generate, so the desktop UI never requests generation; the sidebar only reads the title.pending(...) state.
• Sessions created with opencode run --session <id> "<prompt>" (no --title) did get generated titles in the same install, e.g. prompt Usa la herramienta todowrite para crear 3 tareas de prueba sobre 'probar el panel de ToDos'... produced the title Pruebas del panel de ToDos.
• Intermittent, not deterministic: some desktop sessions do end up titled, others stay empty.
• No title-related errors or warnings in ~/.local/share/opencode/log/opencode.log or the app logs around the affected session's creation; the failure is silent.
• Workaround: /rename in the session, or rename from the sidebar.