refactor(background-agent): optimize task timing and constants management

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

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

src/features/background-agent/constants.ts

@@ -6,8 +6,8 @@ export const MIN_STABILITY_TIME_MS = 10 * 1000
 export const DEFAULT_STALE_TIMEOUT_MS = 180_000
 export const MIN_RUNTIME_BEFORE_STALE_MS = 30_000
 export const MIN_IDLE_TIME_MS = 5000
-export const POLLING_INTERVAL_MS = 2000
-export const TASK_CLEANUP_DELAY_MS = 5 * 60 * 1000
+export const POLLING_INTERVAL_MS = 3000
+export const TASK_CLEANUP_DELAY_MS = 10 * 60 * 1000
 export const TMUX_CALLBACK_DELAY_MS = 200
 
 export type ProcessCleanupEvent = NodeJS.Signals | "beforeExit" | "exit"

src/features/background-agent/manager.ts

@@ -9,6 +9,15 @@ import { log, getAgentToolRestrictions, promptWithModelSuggestionRetry } from ".
 import { ConcurrencyManager } from "./concurrency"
 import type { BackgroundTaskConfig, TmuxConfig } from "../../config/schema"
 import { isInsideTmux } from "../../shared/tmux"
+import {
+  DEFAULT_STALE_TIMEOUT_MS,
+  MIN_IDLE_TIME_MS,
+  MIN_RUNTIME_BEFORE_STALE_MS,
+  MIN_STABILITY_TIME_MS,
+  POLLING_INTERVAL_MS,
+  TASK_CLEANUP_DELAY_MS,
+  TASK_TTL_MS,
+} from "./constants"
 
 import { subagentSessions } from "../claude-code-session-state"
 import { getTaskToastManager } from "../task-toast-manager"
@@ -16,11 +25,6 @@ import { findNearestMessageWithFields, MESSAGE_STORAGE } from "../hook-message-i
 import { existsSync, readdirSync } from "node:fs"
 import { join } from "node:path"
 
-const TASK_TTL_MS = 30 * 60 * 1000
-const MIN_STABILITY_TIME_MS = 10 * 1000  // Must run at least 10s before stability detection kicks in
-const DEFAULT_STALE_TIMEOUT_MS = 180_000  // 3 minutes
-const MIN_RUNTIME_BEFORE_STALE_MS = 30_000  // 30 seconds
-
 type ProcessCleanupEvent = NodeJS.Signals | "beforeExit" | "exit"
 
 type OpencodeClient = PluginInput["client"]
@@ -653,7 +657,6 @@ export class BackgroundManager {
 
       // Edge guard: Require minimum elapsed time (5 seconds) before accepting idle
       const elapsedMs = Date.now() - startedAt.getTime()
-      const MIN_IDLE_TIME_MS = 5000
       if (elapsedMs < MIN_IDLE_TIME_MS) {
         log("[background-agent] Ignoring early session.idle, elapsed:", { elapsedMs, taskId: task.id })
         return
@@ -862,7 +865,7 @@ export class BackgroundManager {
 
     this.pollingInterval = setInterval(() => {
       this.pollRunningTasks()
-    }, 2000)
+    }, POLLING_INTERVAL_MS)
     this.pollingInterval.unref()
   }
 
@@ -1091,7 +1094,7 @@ Use \`background_output(task_id="${task.id}")\` to retrieve this result when rea
         this.tasks.delete(taskId)
         log("[background-agent] Removed completed task from memory:", taskId)
       }
-    }, 5 * 60 * 1000)
+    }, TASK_CLEANUP_DELAY_MS)
     this.completionTimers.set(taskId, timer)
   }
 

src/tools/delegate-task/timing.ts

@@ -1,4 +1,4 @@
-let POLL_INTERVAL_MS = 500
+let POLL_INTERVAL_MS = 1000
 let MIN_STABILITY_TIME_MS = 10000
 let STABILITY_POLLS_REQUIRED = 3
 let WAIT_FOR_SESSION_INTERVAL_MS = 100
@@ -19,7 +19,7 @@ export function getTimingConfig() {
 }
 
 export function __resetTimingConfig(): void {
-  POLL_INTERVAL_MS = 500
+  POLL_INTERVAL_MS = 1000
   MIN_STABILITY_TIME_MS = 10000
   STABILITY_POLLS_REQUIRED = 3
   WAIT_FOR_SESSION_INTERVAL_MS = 100