src/features/tmux-subagent/ — Tmux Pane Management

Generated: 2026-04-11

OVERVIEW

32 files. State-first tmux integration managing panes for background agent sessions. Handles split decisions, grid planning, polling, and lifecycle events.

CORE ARCHITECTURE

TmuxSessionManager (manager.ts)
  ├─→ DecisionEngine: Should we spawn/close panes?
  ├─→ ActionExecutor: Execute spawn/close/replace actions
  ├─→ PollingManager: Monitor pane health
  └─→ EventHandlers: React to session create/delete

All tmux command execution is centralized through src/shared/tmux/runner.ts (runTmuxCommand). Do NOT add direct Bun.spawn([tmux,...]) calls in this module. They will drift from the retry/timeout/terminal-error discipline.

KEY FILES

File	Purpose
`manager.ts`	`TmuxSessionManager` — main class, session tracking, event routing
`decision-engine.ts`	Evaluate window state → produce `SpawnDecision` with actions
`action-executor.ts`	Execute `PaneAction[]` (close, spawn, replace)
`grid-planning.ts`	Calculate pane layout given window dimensions
`spawn-action-decider.ts`	Decide spawn vs replace vs skip
`spawn-target-finder.ts`	Find best pane to split or replace
`polling-manager.ts`	Health polling for tracked sessions
`types.ts`	`TrackedSession`, `WindowState`, `PaneAction`, `SpawnDecision`

PANE LIFECYCLE

session.created → spawn-action-decider → grid-planning → action-executor → track session
session.deleted → cleanup tracked session → close pane if empty

LAYOUT CONSTRAINTS

MIN_PANE_WIDTH: 52 chars
MIN_PANE_HEIGHT: 11 lines
Main pane preserved (never split below minimum)
Agent panes split from remaining space

EVENT HANDLERS

File	Event
`session-created-handler.ts`	New background session → spawn pane
`session-deleted-handler.ts`	Session ended → close pane
`session-created-event.ts`	Event type definition

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