Display /sessions as separate icon/tab in Zed agent panel #11284

Feature Request: Show /sessions as Separate Icon in Zed Agent Panel

Problem

OpenCode provides a powerful /sessions slash command that allows users to:

• List all existing sessions
• Resume previous sessions
• Manage session history

However, in Zed's agent panel, this functionality is only accessible by typing /sessions manually in the chat. This means:

1. Users may not know this feature exists
2. No visual indication of available sessions
3. Requires typing a command instead of clicking

Expected Behavior

Similar to how Claude Code or other agents display sessions in Zed, the /sessions functionality should be accessible as a separate tab or icon in the agent panel, allowing users to:

1. See all active sessions at a glance
2. Quickly switch between sessions
3. Create new sessions
4. View session history

Current State

Currently in Zed:

• Users must manually type /sessions in the chat
• No visual representation of available sessions
• Sessions are hidden functionality

Desired State

┌─────────────────────────────────────────┐
│  Agent Panel                            │
├─────────────────────────────────────────┤
│  [Chat] [Sessions] [Tools]              │  ← Separate tab for sessions
│                                         │
│  📁 Session 1 - Last active: 2h ago     │
│  📁 Session 2 - Last active: yesterday  │
│  📁 Session 3 - Last active: 3 days ago │
│                                         │
│  [+ New Session]                        │
└─────────────────────────────────────────┘

Use Cases

1. Quick Switching: Users working on multiple projects can easily switch between sessions
2. Session Discovery: New users discover the sessions feature
3. Visual Management: Better UX for session management than typing commands
4. Parallel Work: Users can have multiple independent conversations

Implementation Considerations

This would require coordination between:

• OpenCode ACP implementation (to expose sessions as a first-class entity)
• Zed's agent panel UI (to render sessions tab)
• ACP protocol extensions (if sessions aren't already exposed)

Related

• Issue Add support for local executable override (OPENCODE_EXECUTABLE) #11283: Add support for local executable override (OPENCODE_EXECUTABLE)