[ypatel2022]

Summary

Add a titlebar badge that shows how many agents are actively running across all worktrees.

The counter is now pane-aware, so multiple active agents running in split panes within the same terminal tab/worktree are counted separately instead of being treated as a single active agent.

closes #401

Screenshots

UI with 3 agents running:

UI with no agents running:

Testing

• pnpm lint
• pnpm typecheck
• pnpm test
• pnpm build

AI Review Report

Reviewed the change with an AI coding agent and explicitly checked the main risks in the counting path:

• undercounting multiple active agents inside split panes in a single terminal tab
• overcounting stale restored tab titles after PTY exit/ reconnect
• stale runtime state surviving pane, tab, worktree, or repo teardown

The review flagged the original tab-based implementation as too coarse because one tab title cannot represent multiple simultaneously active pane sessions. The implementation was updated to track live pane titles in renderer state, count working agents per pane when available, and fall back to the legacy tab title only for restored/unmounted tabs where pane-level runtime state does not exist yet. Cleanup was added for pane exit and tab/worktree/repo removal so the badge does not stick after teardown.

This PR is renderer/store logic and CSS only, so the existing platform behavior remains intact.

Security Audit

Reviewed the new logic for input handling, command execution, path handling, auth, secrets, dependency, and IPC risk.

Findings:

• pane titles originate from existing terminal/PTy title updates; this PR only stores them as plain strings and classifies them with existing agent-status detection logic
• no new command execution paths were added
• no new IPC channels or auth-sensitive flows were added
• no new filesystem/path manipulation was added
• no dependency changes were made
• no secrets handling changed

Additional checks:

• verified teardown paths clear the new pane-title state so stale runtime metadata does not persist in UI state after panes/tabs/worktrees/repos are removed

[AmethystLiang]

The core logic in PR 484 for managing the active agent count looks very solid and there is no slop code or broken logic. I verified the pane-level title state management, cleanup logic on pane/tab teardown, and fallback logic for unmounted tabs.

I noticed a minor typecheck error (pnpm typecheck failing due to missing setRuntimePaneTitle and clearRuntimePaneTitle properties in the PtyConnectionDeps interface in TerminalPane.tsx) caused by recent changes in main. I've committed a fix to pass those arguments correctly.

Merging this now. Great work!