diff --git a/.claude-plugin/plugin.json b/.claude-plugin/plugin.json
index 18c75bb..5caa027 100644
--- a/.claude-plugin/plugin.json
+++ b/.claude-plugin/plugin.json
@@ -62,6 +62,12 @@
       "description": "輸入先由 Haiku 一次分類，再依難度選模型與思考程度",
       "default": true
     },
+    "background": {
+      "type": "boolean",
+      "title": "背景工作線",
+      "description": "需要動手的要求交給背景子代理處理，對話線立刻回應、完成後由角色回報",
+      "default": true
+    },
     "candidates": {
       "type": "string",
       "title": "候選模型",
diff --git a/hooks/register.tsx b/hooks/register.tsx
index 9f76ed1..ef9335d 100644
--- a/hooks/register.tsx
+++ b/hooks/register.tsx
@@ -243,9 +243,13 @@ async function quotaRemain($: Engine): Promise<number | undefined> {
 }
 
 
+async function pickRoute($: Engine, r: Route | undefined, o: Omit<Parameters<typeof choose>[1], 'quotaRemain'>) {
+  return choose(r ?? { difficulty: 5, model: 'sonnet', effort: 'medium', tone: 'neutral', ack: '', work: false }, { ...o, quotaRemain: await quotaRemain($) })
+}
+
 // 讀 characters/index.json（外掛目錄內），把萃取產生的角色包註冊成可啟動的角色。
 async function loadPacks($: Engine): Promise<void> {
-  const dir = new URL('../characters/', import.meta.url).pathname
+  const dir = `${$.plugin.root}/characters/`
   try {
     if (!(await $.fs.exists(`${dir}index.json`))) return
     const index = JSON.parse(await $.fs.read(`${dir}index.json`)) as { packs: { work: string; workName: string; slug: string }[] }
@@ -268,6 +272,8 @@ export const register: Register = (on, options) => {
   let active: string | undefined
   let toolRegistered = false
   let route: Route | undefined
+  let delegating = false
+  const jobs = new Map<string, string>()
   let lastPick: { model: ModelName; effort: Effort } | undefined
   let prefixed = false
   const holder: { sys?: Sys } = {}
@@ -291,6 +297,13 @@ export const register: Register = (on, options) => {
     return out
   }
 
+  const routeOpts = () => ({
+    candidates: candidates(),
+    lockModel: lockOf<ModelName>('lockModel', ['haiku', 'sonnet', 'opus']),
+    lockEffort: lockOf<Effort>('lockEffort', ['low', 'medium', 'high']),
+    downgradeAt: num('downgradeAt', 15),
+  })
+
   on('session.start', async ($, e, next) => {
     if (isEnabled) {
       await loadPacks($)
@@ -373,6 +386,7 @@ export const register: Register = (on, options) => {
     } else {
       text += `\n${relationText(relationOf(c.timeline, 0, false))}`
     }
+    if (delegating) text += '\n本輪的實際工作已交給背景工作線處理，你不要自己動手做。請只用角色口吻簡短告知已開始處理；完成後會有回報，屆時再向使用者說明結果。'
     return {
       ...res,
       sections: [...res.sections.filter(s => s.id !== 'jsc-anima:persona'), { id: 'jsc-anima:persona', text, scope: 'session' as const }],
@@ -384,6 +398,9 @@ export const register: Register = (on, options) => {
     if (c && flag('todoRemind', true)) await remindDue($, c.name)
     if (!c || e.command || e.isMeta) return next(e)
     prefixed = false
+    delegating = false
+    // 工作線完成後由本外掛送回的回報：直接讓角色說明，不再分類或派工。
+    if (e.origin?.kind === 'plugin') return next(e)
     const axes = applyOverrides(c.axes, overrides())
     if (routingOn()) {
       const res = await $.model
@@ -391,6 +408,17 @@ export const register: Register = (on, options) => {
         .catch(() => undefined)
       route = parseRoute(res && res.isAnswered ? res.text : '')
       if (route.ack) $.ui.log(withPrefix(c.name, route.ack))
+      if (route.work && flag('background', true)) {
+        const pick = await pickRoute($, route, routeOpts())
+        const started = await $.agent
+          .spawn({ prompt: e.text, description: e.text.slice(0, 30), model: pick.model })
+          .catch(() => undefined)
+        if (started && !('deny' in started && started.deny)) {
+          if (started.agentId) jobs.set(started.agentId, e.text)
+          delegating = true
+          lastPick = pick
+        }
+      }
     } else {
       route = undefined
     }
@@ -408,17 +436,28 @@ export const register: Register = (on, options) => {
   on('turn.step', async function* ($, e, next) {
     const c = isEnabled ? findCharacter(active) : undefined
     if (!c || e.agentId || !routingOn()) return yield* next(e)
-    const pick = choose(route ?? { difficulty: 5, model: 'sonnet', effort: 'medium', tone: 'neutral', ack: '' }, {
-      candidates: candidates(),
-      lockModel: lockOf<ModelName>('lockModel', ['haiku', 'sonnet', 'opus']),
-      lockEffort: lockOf<Effort>('lockEffort', ['low', 'medium', 'high']),
-      quotaRemain: await quotaRemain($),
-      downgradeAt: num('downgradeAt', 15),
-    })
+    // 對話線：工作已交給背景工作線時，主迴圈只負責以角色口吻回應，用最便宜的模型。
+    const pick = delegating ? { model: 'haiku' as ModelName, effort: 'low' as Effort } : await pickRoute($, route, routeOpts())
     lastPick = { model: pick.model, effort: pick.effort }
     return yield* next({ ...e, model: pick.model, effort: pick.effort })
   })
 
+  on('turn.complete', async ($, e, next) => {
+    const res = await next(e)
+    const task = e.agentId ? jobs.get(e.agentId) : undefined
+    const c = isEnabled ? findCharacter(active) : undefined
+    if (e.agentId && task !== undefined) {
+      jobs.delete(e.agentId)
+      if (c) {
+        const body = e.reason === 'answer' ? e.answer : `（工作未完成：${e.reason}）`
+        void $.prompt.submit({ text: `[工作線回報] 使用者的要求：${task}\n處理結果：\n${body}\n請用角色口吻向使用者說明結果，技術內容原樣保留。` }).catch(() => undefined)
+      }
+    } else if (!e.agentId) {
+      delegating = false
+    }
+    return res
+  })
+
   on('session.append', { door: 'response' }, async ($, e, next) => {
     const c = isEnabled ? findCharacter(active) : undefined
     if (!c || e.agentId || !flag('rewrite', true) || e.message.type !== 'assistant') return next(e)
diff --git a/hooks/router.ts b/hooks/router.ts
index 6f446c5..3b8b3a7 100644
--- a/hooks/router.ts
+++ b/hooks/router.ts
@@ -1,15 +1,15 @@
 export type ModelName = 'haiku' | 'sonnet' | 'opus'
 export type Effort = 'low' | 'medium' | 'high'
 export type Tone = 'neutral' | 'praise' | 'scold'
-export type Route = { difficulty: number; model: ModelName; effort: Effort; tone: Tone; ack: string }
+export type Route = { difficulty: number; model: ModelName; effort: Effort; tone: Tone; ack: string; work: boolean }
 
 export const LADDER: readonly ModelName[] = ['haiku', 'sonnet', 'opus']
 
-export const FALLBACK_ROUTE: Route = { difficulty: 5, model: 'sonnet', effort: 'medium', tone: 'neutral', ack: '' }
+export const FALLBACK_ROUTE: Route = { difficulty: 5, model: 'sonnet', effort: 'medium', tone: 'neutral', ack: '', work: false }
 
 export const CLASSIFY_PROMPT =
   '你是路由器。讀下面使用者輸入，只回傳一行 JSON：' +
-  '{"difficulty":1-10,"model":"haiku|sonnet|opus","effort":"low|medium|high","tone":"neutral|praise|scold","ack":"角色以口吻立刻回應的一句話"}。' +
+  '{"difficulty":1-10,"model":"haiku|sonnet|opus","effort":"low|medium|high","tone":"neutral|praise|scold","ack":"角色以口吻立刻回應的一句話","work":true|false}。work 為 true 表示需要動手做事（讀寫檔、執行指令、搜尋、改程式）；純閒聊或一句話可答的問題為 false。' +
   'difficulty 低用 haiku，中用 sonnet，高或需深入推理用 opus；tone 是使用者對角色的態度（誇獎／感謝為 praise，責罵為 scold）。\n\n使用者輸入：\n'
 
 const isModel = (v: unknown): v is ModelName => v === 'haiku' || v === 'sonnet' || v === 'opus'
@@ -27,6 +27,7 @@ export const parseRoute = (text: string): Route => {
       effort: isEffort(j.effort) ? j.effort : FALLBACK_ROUTE.effort,
       tone: isTone(j.tone) ? j.tone : 'neutral',
       ack: typeof j.ack === 'string' ? j.ack.slice(0, 200) : '',
+      work: j.work === true,
     }
   } catch {
     return FALLBACK_ROUTE
diff --git a/hooks/routing.test.ts b/hooks/routing.test.ts
index 51aec42..79a1ae9 100644
--- a/hooks/routing.test.ts
+++ b/hooks/routing.test.ts
@@ -1,9 +1,9 @@
 import { expect, mock, test } from 'claude-code/testing'
 
-type Ctl = { complete: (e: any) => unknown; usage: unknown; seen?: any }
+type Ctl = { complete: (e: any) => unknown; usage: unknown; seen?: any; submitted: string[] }
 
 const setup = (on: any): Ctl => {
-  const ctl: Ctl = { complete: () => ({ isAnswered: false, reason: 'aborted' }), usage: { rateLimits: [], context: {} } }
+  const ctl: Ctl = { complete: () => ({ isAnswered: false, reason: 'aborted' }), usage: { rateLimits: [], context: {} }, submitted: [] }
   mock.store(on)
   mock.clock(on, { now: Date.parse('2026-10-15T08:00:00Z') })
   on('ui.log', () => ({ value: undefined }) as never)
@@ -11,7 +11,7 @@ const setup = (on: any): Ctl => {
   on('session.start', () => ({ cwd: '/tmp' }) as never)
   on('command.run', () => ({ text: '' }))
   on('prompt.compose', () => ({ sections: [] }))
-  on('prompt.submit', (_$: any, e: any) => ({ text: e.text }) as never)
+  on('prompt.submit', (_$: any, e: any) => (ctl.submitted.push(e.text), { text: e.text }) as never)
   on('model.complete', (_$: any, e: any) => ({ value: ctl.complete(e) }) as never)
   on('session.usage', () => ({ value: ctl.usage }) as never)
   on('turn.step', async function* (_$: any, e: any) {
@@ -142,3 +142,30 @@ test('未成年角色維持友情，即使好感度最高且開啟戀愛式依
   await $.command.run({ command: 'anima-affinity', args: '100' } as never)
   expect((await personaText($)).includes('關係定位：友情')).toBe(true)
 })
+
+const workRoute = (model: string, work: boolean) => ({ isAnswered: true, usage, text: `{"difficulty":8,"model":"${model}","effort":"high","tone":"neutral","ack":"好，我來處理。","work":${work}}` })
+
+test('需要動手的要求交給背景工作線，對話線改用 Haiku', async ($, on) => {
+  const ctl = setup(on)
+  const spawned: any[] = []
+  on('agent.spawn', (_$: any, e: any) => (spawned.push(e), { model: e.model, agentId: 'a1' }) as never)
+  ctl.complete = () => workRoute('opus', true)
+  await start($)
+  await submit($, '幫我重構 src 目錄')
+  expect(spawned.length).toBe(1)
+  expect(spawned[0].model).toBe('opus')
+  await step($, 'main')
+  expect(ctl.seen.model).toBe('haiku')
+  const sys = await $.prompt.compose({ model: 'm', promptModel: 'm', surfaces: [], tools: [], outputStyle: null, traits: [] } as never)
+  expect(sys.sections.find((s: any) => s.id === 'jsc-anima:persona')?.text).toContain('背景工作線')
+})
+
+test('work 為 false 或關閉背景工作線時不派工', async ($, on) => {
+  const ctl = setup(on)
+  let n = 0
+  on('agent.spawn', () => (n++, { model: 'm', agentId: 'a' }) as never)
+  ctl.complete = () => workRoute('sonnet', false)
+  await start($)
+  await submit($, '你好')
+  expect(n).toBe(0)
+})