Add tmux pane management for background agent sessions (code-yeongyu#1094)

* feat(config): add TmuxConfigSchema for tmux subagent pane management

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

* feat(shared): add tmux module structure

* feat(shared/tmux): implement tmux pane utilities

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

* test(tmux-subagent): add TmuxSessionManager tests (TDD RED)

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

* feat(tmux-subagent): implement TmuxSessionManager

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

* feat(integration): wire TmuxSessionManager with 500ms delay

- Task 5: Add 500ms delay in BackgroundManager after session creation
- Task 6: Wire TmuxSessionManager event handlers (session.created/deleted)
- Both changes integrate tmux pane management into plugin lifecycle

Co-authored-by: Sisyphus <ultrawork@oh-my-opencode>

---------

Co-authored-by: justsisyphus <justsisyphus@users.noreply.github.com>
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
Co-authored-by: Sisyphus <ultrawork@oh-my-opencode>

Author: 4 people

assets/oh-my-opencode.schema.json

@@ -2186,6 +2186,32 @@
           ]
         }
       }
+    },
+    "tmux": {
+      "type": "object",
+      "properties": {
+        "enabled": {
+          "default": false,
+          "type": "boolean"
+        },
+        "layout": {
+          "default": "main-vertical",
+          "type": "string",
+          "enum": [
+            "main-horizontal",
+            "main-vertical",
+            "tiled",
+            "even-horizontal",
+            "even-vertical"
+          ]
+        },
+        "main_pane_size": {
+          "default": 60,
+          "type": "number",
+          "minimum": 20,
+          "maximum": 80
+        }
+      }
     }
   }
 }

bun.lock

@@ -9,6 +9,8 @@ export {
   SisyphusAgentConfigSchema,
   ExperimentalConfigSchema,
   RalphLoopConfigSchema,
+  TmuxConfigSchema,
+  TmuxLayoutSchema,
 } from "./schema"
 
 export type {
@@ -23,4 +25,6 @@ export type {
   ExperimentalConfig,
   DynamicContextPruningConfig,
   RalphLoopConfig,
+  TmuxConfig,
+  TmuxLayout,
 } from "./schema"

src/config/index.ts

@@ -310,6 +310,19 @@ export const BrowserAutomationConfigSchema = z.object({
   provider: BrowserAutomationProviderSchema.default("playwright"),
 })
 
+export const TmuxLayoutSchema = z.enum([
+  'main-horizontal',  // main pane top, agent panes bottom stack
+  'main-vertical',    // main pane left, agent panes right stack (default)
+  'tiled',            // all panes same size grid
+  'even-horizontal',  // all panes horizontal row
+  'even-vertical',    // all panes vertical stack
+])
+
+export const TmuxConfigSchema = z.object({
+  enabled: z.boolean().default(false),           // default: false (disabled)
+  layout: TmuxLayoutSchema.default('main-vertical'),  // default: main-vertical
+  main_pane_size: z.number().min(20).max(80).default(60),  // percentage, default: 60%
+})
 export const OhMyOpenCodeConfigSchema = z.object({
   $schema: z.string().optional(),
   disabled_mcps: z.array(AnyMcpNameSchema).optional(),
@@ -330,6 +343,7 @@ export const OhMyOpenCodeConfigSchema = z.object({
   notification: NotificationConfigSchema.optional(),
   git_master: GitMasterConfigSchema.optional(),
   browser_automation_engine: BrowserAutomationConfigSchema.optional(),
+  tmux: TmuxConfigSchema.optional(),
 })
 
 export type OhMyOpenCodeConfig = z.infer<typeof OhMyOpenCodeConfigSchema>
@@ -354,5 +368,7 @@ export type BuiltinCategoryName = z.infer<typeof BuiltinCategoryNameSchema>
 export type GitMasterConfig = z.infer<typeof GitMasterConfigSchema>
 export type BrowserAutomationProvider = z.infer<typeof BrowserAutomationProviderSchema>
 export type BrowserAutomationConfig = z.infer<typeof BrowserAutomationConfigSchema>
+export type TmuxConfig = z.infer<typeof TmuxConfigSchema>
+export type TmuxLayout = z.infer<typeof TmuxLayoutSchema>
 
 export { AnyMcpNameSchema, type AnyMcpName, McpNameSchema, type McpName } from "../mcp/types"

src/config/schema.ts

@@ -7,7 +7,8 @@ import type {
 } from "./types"
 import { log, getAgentToolRestrictions } from "../../shared"
 import { ConcurrencyManager } from "./concurrency"
-import type { BackgroundTaskConfig } from "../../config/schema"
+import type { BackgroundTaskConfig, TmuxConfig } from "../../config/schema"
+import { isInsideTmux } from "../../shared/tmux"
 
 import { subagentSessions } from "../claude-code-session-state"
 import { getTaskToastManager } from "../task-toast-manager"
@@ -68,19 +69,24 @@ export class BackgroundManager {
   private concurrencyManager: ConcurrencyManager
   private shutdownTriggered = false
   private config?: BackgroundTaskConfig
-
+  private tmuxEnabled: boolean
 
   private queuesByKey: Map<string, QueueItem[]> = new Map()
   private processingKeys: Set<string> = new Set()
 
-  constructor(ctx: PluginInput, config?: BackgroundTaskConfig) {
+  constructor(
+    ctx: PluginInput,
+    config?: BackgroundTaskConfig,
+    tmuxConfig?: TmuxConfig
+  ) {
     this.tasks = new Map()
     this.notifications = new Map()
     this.pendingByParent = new Map()
     this.client = ctx.client
     this.directory = ctx.directory
     this.concurrencyManager = new ConcurrencyManager(config)
     this.config = config
+    this.tmuxEnabled = tmuxConfig?.enabled ?? false
     this.registerProcessCleanup()
   }
 
@@ -222,6 +228,11 @@ export class BackgroundManager {
     const sessionID = createResult.data.id
     subagentSessions.add(sessionID)
 
+    // Wait for TmuxSessionManager to spawn pane via event hook
+    if (this.tmuxEnabled && isInsideTmux()) {
+      await new Promise(r => setTimeout(r, 500))
+    }
+
     // Update task to running state
     task.status = "running"
     task.startedAt = new Date()

src/features/background-agent/manager.ts

@@ -0,0 +1,2 @@
+export * from "./manager"
+export * from "./types"