feat(tui): show running tools and LLM status in sidebar

[Becktor]

Problem

When running long operations (tools, background agents, LLM inference), there's no visibility into what's currently happening in the session.

Proposed Solution

Add a "Running" section to the sidebar that shows:

• LLM status on top (Pondering, Streaming, Sending, Retry) with elapsed time
• Active tools (bash, grep, glob, etc.) with command preview and elapsed time
• Background agents numbered as agent1, agent2, etc.

Screenshot

Notes

This is a UI change, so I understand it needs design review. Happy to discuss the approach or make adjustments based on feedback.

I have a working implementation ready if this is something the team would consider.

[github-actions]

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

• feat: Show background tasks status in sidebar #8322: Show background tasks status in sidebar - directly requests the same feature with task count badge and expandable list showing agent type, description, and elapsed time
• [FEATURE]: Desktop app needs better visual feedback when working #8904: Desktop app needs better visual feedback when working - requests persistent, animated visual indicators showing when OpenCode is actively working
• [FEATURE]: Show elapsed runtime per command / instruction in TUI + Replay #5872: Show elapsed runtime per command / instruction in TUI + Replay - requests elapsed time visibility for active commands/instructions
• [FEATURE]: "Waiting for" indicator #7093: 'Waiting for' indicator - requests clearer indication of what the system is waiting for (LLM API response, MCP API response, local command)
• [FEATURE]: progress indicator #3742: progress indicator - requests visual indicator showing whether response is in progress or finished
• TUI should show when it is retrying #4089: TUI should show when it is retrying - requests visibility into retry status

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

[R44VC0RP]

Thanks for the detailed proposal and mockup @Becktor! This addresses a real pain point - not knowing what's happening during long-running operations.

A few related issues have been flagged:

• feat: Show background tasks status in sidebar #8322 specifically asks for background task visibility in the sidebar
• [FEATURE]: "Waiting for" indicator #7093 and [FEATURE]: Show elapsed runtime per command / instruction in TUI + Replay #5872 request "waiting for" indicators and elapsed time

Your proposal is the most comprehensive of the bunch and includes a nice UI mockup. Since you mention you have a working implementation ready, would you be open to submitting a PR?

A few things to consider for the PR:

• The current SessionStatus types (idle, retry, busy) would likely need to be extended to capture the granular tool/LLM states you're proposing
• The sidebar component (sidebar.tsx) is already structured with collapsible sections, so adding a "Running" section should fit well with the existing pattern

Looking forward to seeing the implementation!

[Becktor]

Hey thanks for the feedback!
Yeah I already have a suggestion on how to get the granular states:

edit: ended up extending the SessionStatus types instead. Was a lot cleaner.

For running tools, I just look for ToolPart entries with state.status === "running" and check elapsed time against a 2 second threshold.
The PR is ready: #9658