diff --git a/lib/bridge.js b/lib/bridge.js
index d1457a9..eefebfc 100644
--- a/lib/bridge.js
+++ b/lib/bridge.js
@@ -14,11 +14,36 @@ import { formatLastTurn, loadLastTurn } from './history.js';
 import { describeAgent, displayLabel, workspaceName } from './label.js';
 import { formatModel, loadSessionModels, selectSessionModel, } from './models.js';
 import { formatStatusText, } from './status.js';
-function compactErrorCode(err) {
-    const code = err?.code;
-    if (code === 'busy' || code === 'cancelled' || code === 'changed'
-        || code === 'summary' || code === 'commit' || code === 'persistence') {
-        return code;
+/**
+ * 把 command-compact 返回的英文结果翻译成 TG 中文回复。
+ * 文案以宿主 @deepseek-ai/dsh-command-compact 的固定输出为准；无法识别时返回
+ * undefined，由调用方回退为「压缩失败 + 原文详情」。
+ */
+function translateCompactResult(result) {
+    const kind = result?.kind;
+    const text = result?.text ?? '';
+    if (kind === 'success') {
+        const m = /Compacted (\d+) history items \(~(\d+) tokens\)/.exec(text);
+        if (m)
+            return MSG.COMPACT_DONE(Number(m[1]), Number(m[2]));
+        if (/No compactable history yet/.test(text))
+            return MSG.COMPACT_NOTHING;
+        return undefined;
+    }
+    if (kind === 'error') {
+        if (/active compaction|not idle/.test(text))
+            return MSG.COMPACT_BUSY;
+        if (/^Compaction cancelled/.test(text))
+            return MSG.COMPACT_CANCELLED;
+        if (/history selected for compaction changed/.test(text))
+            return MSG.COMPACT_CHANGED;
+        if (/could not produce a useful summary/.test(text))
+            return MSG.COMPACT_SUMMARY_FAILED;
+        if (/did not finish cleanly/.test(text))
+            return MSG.COMPACT_COMMIT_FAILED;
+        if (/could not be saved/.test(text))
+            return MSG.COMPACT_PERSIST_FAILED;
+        return undefined;
     }
     return undefined;
 }
@@ -758,17 +783,17 @@ export class TelegramBridge {
         return undefined;
     }
     // ── /compact：手动压缩当前绑定会话（需会话空闲）──
+    //
+    // 压缩引擎（compaction-basic）挂载在隔离作用域，插件 ctx 拿不到；但宿主的
+    // command-compact 已把 /compact 注册进命令运行时的按 agent 作用层（Web 端
+    // 同款通道），因此这里复用它：语义、busy/错误映射、命令生命周期日志与 Web
+    // 端 /compact 完全一致，且无需接触引擎内部。
     async requestCompact(chatId) {
         const binding = this.bindings.get(String(chatId));
         if (!binding) {
             await this.client.sendMessage(chatId, MSG.NEED_BIND);
             return;
         }
-        const engine = this.serviceOf('compaction');
-        if (!engine?.compactNow) {
-            await this.client.sendMessage(chatId, MSG.COMPACT_UNAVAILABLE);
-            return;
-        }
         if (this.compacting.has(binding.sessionId)) {
             await this.client.sendMessage(chatId, MSG.COMPACT_INFLIGHT);
             return;
@@ -779,25 +804,24 @@ export class TelegramBridge {
             await this.client.sendMessage(chatId, MSG.GONE);
             return;
         }
-        const controller = new AbortController();
-        let operation;
-        try {
-            // compactNow 在会话忙时同步抛 busy（runMaintenance 同步判定）。
-            operation = engine.compactNow(agent, controller.signal);
-        }
-        catch (err) {
-            const code = compactErrorCode(err);
-            if (code === 'busy') {
-                await this.client.sendMessage(chatId, MSG.COMPACT_BUSY);
-                return;
-            }
-            this.ctx.logger.warn(`dsh-telegram-channel: /compact rejected: ${this.redact(err)}`);
-            await this.client.sendMessage(chatId, MSG.COMPACT_FAILED(this.redact(err)));
+        const commands = this.serviceOf('commands');
+        if (!commands?.execute || typeof commands.find !== 'function' || !commands.find(agent, 'compact')) {
+            await this.client.sendMessage(chatId, MSG.COMPACT_UNAVAILABLE);
             return;
         }
+        // 会话正在跑任务时压缩会被拒（runMaintenance 忙）；提前提示避免「已开始→失败」两步。
+        const busy = this.busySessions.has(binding.sessionId)
+            || Boolean(agent.phase?.kind
+                && agent.phase?.kind !== 'idle');
+        if (busy) {
+            await this.client.sendMessage(chatId, MSG.COMPACT_BUSY);
+            return;
+        }
+        const controller = new AbortController();
         this.compacting.add(binding.sessionId);
         this.compactAborts.set(binding.sessionId, controller);
         await this.client.sendMessage(chatId, MSG.COMPACT_STARTED);
+        const operation = commands.execute(agent, '/compact', [], controller.signal);
         void this.runCompaction(chatId, binding.sessionId, operation, controller).catch((err) => {
             this.ctx.logger.error(`dsh-telegram-channel: /compact runner crashed: ${this.redact(err)}`);
         });
@@ -805,13 +829,20 @@ export class TelegramBridge {
     /** 等待压缩落定并汇报结果（不阻塞轮询循环）。 */
     async runCompaction(chatId, sessionId, operation, controller) {
         try {
-            const result = await operation;
-            if (result === null) {
-                await this.enqueueNotice(chatId, MSG.COMPACT_NOTHING);
+            const execution = await operation;
+            if (execution === undefined) {
+                // find() 通过但 execute 未命中：按未注册处理。
+                await this.enqueueNotice(chatId, MSG.COMPACT_UNAVAILABLE);
+                return;
             }
-            else {
-                await this.enqueueNotice(chatId, MSG.COMPACT_DONE(result.shadowedSeqs.length, result.shadowedTokenCount));
+            const translated = translateCompactResult(execution.result);
+            if (translated !== undefined) {
+                await this.enqueueNotice(chatId, translated);
+                return;
             }
+            // 无法识别的结果：回退为通用失败 + 宿主原文。
+            const raw = execution.result?.text;
+            await this.enqueueNotice(chatId, MSG.COMPACT_FAILED(raw));
         }
         catch (err) {
             if (controller.signal.aborted) {
@@ -819,30 +850,8 @@ export class TelegramBridge {
                 this.ctx.logger.info('dsh-telegram-channel: compaction aborted by bridge stop');
                 return;
             }
-            const code = compactErrorCode(err);
-            switch (code) {
-                case 'cancelled':
-                    await this.enqueueNotice(chatId, MSG.COMPACT_CANCELLED);
-                    return;
-                case 'changed':
-                    await this.enqueueNotice(chatId, MSG.COMPACT_CHANGED);
-                    return;
-                case 'summary':
-                    await this.enqueueNotice(chatId, MSG.COMPACT_SUMMARY_FAILED);
-                    return;
-                case 'commit':
-                    await this.enqueueNotice(chatId, MSG.COMPACT_COMMIT_FAILED);
-                    return;
-                case 'persistence':
-                    await this.enqueueNotice(chatId, MSG.COMPACT_PERSIST_FAILED);
-                    return;
-                case 'busy':
-                    await this.enqueueNotice(chatId, MSG.COMPACT_BUSY);
-                    return;
-                default:
-                    this.ctx.logger.warn(`dsh-telegram-channel: /compact failed: ${this.redact(err)}`);
-                    await this.enqueueNotice(chatId, MSG.COMPACT_FAILED(this.redact(err)));
-            }
+            this.ctx.logger.warn(`dsh-telegram-channel: /compact failed: ${this.redact(err)}`);
+            await this.enqueueNotice(chatId, MSG.COMPACT_FAILED(this.redact(err)));
         }
         finally {
             this.compacting.delete(sessionId);
diff --git a/lib/commands.d.ts b/lib/commands.d.ts
index 40898bc..ef8688a 100644
--- a/lib/commands.d.ts
+++ b/lib/commands.d.ts
@@ -15,7 +15,7 @@ export declare const MSG: {
     readonly STATUS_BOUND: (label: string) => string;
     readonly STATUS_BOUND_COLD: (label: string) => string;
     readonly COMPACT_USAGE: "用法：/compact（无参数，压缩当前绑定会话的历史，缩短上下文）";
-    readonly COMPACT_UNAVAILABLE: "当前宿主未启用压缩服务（compaction 未装配），无法执行 /compact。";
+    readonly COMPACT_UNAVAILABLE: "当前宿主不可用压缩：/compact 命令未注册（需宿主启用压缩插件 command-compact / compaction-basic 后重启 dsh web）。";
     readonly COMPACT_STARTED: "已开始压缩会话历史…\n压缩会占用一个模型回合，期间新消息排队；完成或失败后会在这里报告结果。";
     readonly COMPACT_BUSY: "当前会话有任务正在运行（或压缩锁被占用），无法压缩。请等本轮结束（或 /stop）后再试。";
     readonly COMPACT_INFLIGHT: "该会话已在进行压缩，请稍候（完成后会报告结果）。";
diff --git a/lib/commands.js b/lib/commands.js
index f584a79..8920d16 100644
--- a/lib/commands.js
+++ b/lib/commands.js
@@ -39,7 +39,7 @@ export const MSG = {
         return `当前绑定：${label}\n（会话当前未在内存中运行；发消息时会自动 resume。）`;
     },
     COMPACT_USAGE: '用法：/compact（无参数，压缩当前绑定会话的历史，缩短上下文）',
-    COMPACT_UNAVAILABLE: '当前宿主未启用压缩服务（compaction 未装配），无法执行 /compact。',
+    COMPACT_UNAVAILABLE: '当前宿主不可用压缩：/compact 命令未注册（需宿主启用压缩插件 command-compact / compaction-basic 后重启 dsh web）。',
     COMPACT_STARTED: '已开始压缩会话历史…\n压缩会占用一个模型回合，期间新消息排队；完成或失败后会在这里报告结果。',
     COMPACT_BUSY: '当前会话有任务正在运行（或压缩锁被占用），无法压缩。请等本轮结束（或 /stop）后再试。',
     COMPACT_INFLIGHT: '该会话已在进行压缩，请稍候（完成后会报告结果）。',
diff --git a/src/bridge.ts b/src/bridge.ts
index 3920731..3336109 100644
--- a/src/bridge.ts
+++ b/src/bridge.ts
@@ -126,27 +126,49 @@ interface ProjectionRegistryLike {
   snapshot?: (session: unknown) => { asOfSeq: number; values: Record<string, unknown> } | undefined
 }
 
-/** 手动压缩引擎（结构镜像 ctx.compaction.compactNow）。 */
-interface CompactionEngineLike {
-  compactNow?: (
+/**
+ * 命令运行时（结构镜像 ctx.commands.execute）。
+ *
+ * /compact 不在插件可见作用域内直接提供 compaction 服务（compaction-basic 挂载在
+ * 隔离作用域，ctx.get 取不到），但宿主命令运行时可见，且 command-compact 已把
+ * /compact 注册进该运行时的按 agent 作用层 —— Web 端正是用 execute() 派发它的。
+ * TG 端复用同一条通道：语义、busy/错误映射、命令生命周期日志与 Web 完全一致。
+ */
+interface CommandsRuntimeLike {
+  find?: (agent: unknown, name: string) => unknown
+  execute?: (
     agent: unknown,
+    line: string,
+    images: readonly unknown[],
     signal: AbortSignal,
-    sourceCommandId?: string,
-  ) => Promise<{
-    shadowedSeqs: number[]
-    shadowedTokenCount: number
-    summarySeq: number
-  } | null>
+  ) => Promise<{ commandId: string; result: { kind: string; text?: string } } | undefined>
 }
 
-/** 手动压缩的预期失败类（ManualCompactionError.code 的运行时字符串）。 */
-type CompactFailureCode = 'busy' | 'cancelled' | 'changed' | 'summary' | 'commit' | 'persistence'
+/** command-compact 的 CommandResult.kind 值。 */
+type CompactCommandKind = 'success' | 'error'
 
-function compactErrorCode(err: unknown): CompactFailureCode | undefined {
-  const code = (err as { code?: unknown } | undefined)?.code
-  if (code === 'busy' || code === 'cancelled' || code === 'changed'
-    || code === 'summary' || code === 'commit' || code === 'persistence') {
-    return code
+/**
+ * 把 command-compact 返回的英文结果翻译成 TG 中文回复。
+ * 文案以宿主 @deepseek-ai/dsh-command-compact 的固定输出为准；无法识别时返回
+ * undefined，由调用方回退为「压缩失败 + 原文详情」。
+ */
+function translateCompactResult(result: { kind: string; text?: string } | undefined): string | undefined {
+  const kind = result?.kind as CompactCommandKind | undefined
+  const text = result?.text ?? ''
+  if (kind === 'success') {
+    const m = /Compacted (\d+) history items \(~(\d+) tokens\)/.exec(text)
+    if (m) return MSG.COMPACT_DONE(Number(m[1]), Number(m[2]))
+    if (/No compactable history yet/.test(text)) return MSG.COMPACT_NOTHING
+    return undefined
+  }
+  if (kind === 'error') {
+    if (/active compaction|not idle/.test(text)) return MSG.COMPACT_BUSY
+    if (/^Compaction cancelled/.test(text)) return MSG.COMPACT_CANCELLED
+    if (/history selected for compaction changed/.test(text)) return MSG.COMPACT_CHANGED
+    if (/could not produce a useful summary/.test(text)) return MSG.COMPACT_SUMMARY_FAILED
+    if (/did not finish cleanly/.test(text)) return MSG.COMPACT_COMMIT_FAILED
+    if (/could not be saved/.test(text)) return MSG.COMPACT_PERSIST_FAILED
+    return undefined
   }
   return undefined
 }
@@ -914,6 +936,11 @@ export class TelegramBridge {
   }
 
   // ── /compact：手动压缩当前绑定会话（需会话空闲）──
+  //
+  // 压缩引擎（compaction-basic）挂载在隔离作用域，插件 ctx 拿不到；但宿主的
+  // command-compact 已把 /compact 注册进命令运行时的按 agent 作用层（Web 端
+  // 同款通道），因此这里复用它：语义、busy/错误映射、命令生命周期日志与 Web
+  // 端 /compact 完全一致，且无需接触引擎内部。
 
   private async requestCompact(chatId: number): Promise<void> {
     const binding = this.bindings.get(String(chatId))
@@ -921,11 +948,6 @@ export class TelegramBridge {
       await this.client.sendMessage(chatId, MSG.NEED_BIND)
       return
     }
-    const engine = this.serviceOf<CompactionEngineLike>('compaction')
-    if (!engine?.compactNow) {
-      await this.client.sendMessage(chatId, MSG.COMPACT_UNAVAILABLE)
-      return
-    }
     if (this.compacting.has(binding.sessionId)) {
       await this.client.sendMessage(chatId, MSG.COMPACT_INFLIGHT)
       return
@@ -936,24 +958,24 @@ export class TelegramBridge {
       await this.client.sendMessage(chatId, MSG.GONE)
       return
     }
-    const controller = new AbortController()
-    let operation: Promise<{ shadowedSeqs: number[]; shadowedTokenCount: number; summarySeq: number } | null>
-    try {
-      // compactNow 在会话忙时同步抛 busy（runMaintenance 同步判定）。
-      operation = engine.compactNow(agent as never, controller.signal)
-    } catch (err) {
-      const code = compactErrorCode(err)
-      if (code === 'busy') {
-        await this.client.sendMessage(chatId, MSG.COMPACT_BUSY)
-        return
-      }
-      this.ctx.logger.warn(`dsh-telegram-channel: /compact rejected: ${this.redact(err)}`)
-      await this.client.sendMessage(chatId, MSG.COMPACT_FAILED(this.redact(err)))
+    const commands = this.serviceOf<CommandsRuntimeLike>('commands')
+    if (!commands?.execute || typeof commands.find !== 'function' || !commands.find(agent, 'compact')) {
+      await this.client.sendMessage(chatId, MSG.COMPACT_UNAVAILABLE)
       return
     }
+    // 会话正在跑任务时压缩会被拒（runMaintenance 忙）；提前提示避免「已开始→失败」两步。
+    const busy = this.busySessions.has(binding.sessionId)
+      || Boolean((agent as { phase?: { kind?: string } }).phase?.kind
+        && (agent as { phase?: { kind?: string } }).phase?.kind !== 'idle')
+    if (busy) {
+      await this.client.sendMessage(chatId, MSG.COMPACT_BUSY)
+      return
+    }
+    const controller = new AbortController()
     this.compacting.add(binding.sessionId)
     this.compactAborts.set(binding.sessionId, controller)
     await this.client.sendMessage(chatId, MSG.COMPACT_STARTED)
+    const operation = commands.execute(agent as never, '/compact', [], controller.signal)
     void this.runCompaction(chatId, binding.sessionId, operation, controller).catch((err) => {
       this.ctx.logger.error(`dsh-telegram-channel: /compact runner crashed: ${this.redact(err)}`)
     })
@@ -963,46 +985,32 @@ export class TelegramBridge {
   private async runCompaction(
     chatId: number,
     sessionId: string,
-    operation: Promise<{ shadowedSeqs: number[]; shadowedTokenCount: number; summarySeq: number } | null>,
+    operation: Promise<{ commandId: string; result: { kind: string; text?: string } } | undefined>,
     controller: AbortController,
   ): Promise<void> {
     try {
-      const result = await operation
-      if (result === null) {
-        await this.enqueueNotice(chatId, MSG.COMPACT_NOTHING)
-      } else {
-        await this.enqueueNotice(chatId, MSG.COMPACT_DONE(result.shadowedSeqs.length, result.shadowedTokenCount))
+      const execution = await operation
+      if (execution === undefined) {
+        // find() 通过但 execute 未命中：按未注册处理。
+        await this.enqueueNotice(chatId, MSG.COMPACT_UNAVAILABLE)
+        return
       }
+      const translated = translateCompactResult(execution.result)
+      if (translated !== undefined) {
+        await this.enqueueNotice(chatId, translated)
+        return
+      }
+      // 无法识别的结果：回退为通用失败 + 宿主原文。
+      const raw = execution.result?.text
+      await this.enqueueNotice(chatId, MSG.COMPACT_FAILED(raw))
     } catch (err) {
       if (controller.signal.aborted) {
         // 桥停止/热重载导致的取消：静默，不打扰（本实例正在退出）。
         this.ctx.logger.info('dsh-telegram-channel: compaction aborted by bridge stop')
         return
       }
-      const code = compactErrorCode(err)
-      switch (code) {
-        case 'cancelled':
-          await this.enqueueNotice(chatId, MSG.COMPACT_CANCELLED)
-          return
-        case 'changed':
-          await this.enqueueNotice(chatId, MSG.COMPACT_CHANGED)
-          return
-        case 'summary':
-          await this.enqueueNotice(chatId, MSG.COMPACT_SUMMARY_FAILED)
-          return
-        case 'commit':
-          await this.enqueueNotice(chatId, MSG.COMPACT_COMMIT_FAILED)
-          return
-        case 'persistence':
-          await this.enqueueNotice(chatId, MSG.COMPACT_PERSIST_FAILED)
-          return
-        case 'busy':
-          await this.enqueueNotice(chatId, MSG.COMPACT_BUSY)
-          return
-        default:
-          this.ctx.logger.warn(`dsh-telegram-channel: /compact failed: ${this.redact(err)}`)
-          await this.enqueueNotice(chatId, MSG.COMPACT_FAILED(this.redact(err)))
-      }
+      this.ctx.logger.warn(`dsh-telegram-channel: /compact failed: ${this.redact(err)}`)
+      await this.enqueueNotice(chatId, MSG.COMPACT_FAILED(this.redact(err)))
     } finally {
       this.compacting.delete(sessionId)
       this.compactAborts.delete(sessionId)
diff --git a/src/commands.ts b/src/commands.ts
index 22e45a4..8a7e6ee 100644
--- a/src/commands.ts
+++ b/src/commands.ts
@@ -39,7 +39,7 @@ export const MSG = {
     return `当前绑定：${label}\n（会话当前未在内存中运行；发消息时会自动 resume。）`
   },
   COMPACT_USAGE: '用法：/compact（无参数，压缩当前绑定会话的历史，缩短上下文）',
-  COMPACT_UNAVAILABLE: '当前宿主未启用压缩服务（compaction 未装配），无法执行 /compact。',
+  COMPACT_UNAVAILABLE: '当前宿主不可用压缩：/compact 命令未注册（需宿主启用压缩插件 command-compact / compaction-basic 后重启 dsh web）。',
   COMPACT_STARTED: '已开始压缩会话历史…\n压缩会占用一个模型回合，期间新消息排队；完成或失败后会在这里报告结果。',
   COMPACT_BUSY: '当前会话有任务正在运行（或压缩锁被占用），无法压缩。请等本轮结束（或 /stop）后再试。',
   COMPACT_INFLIGHT: '该会话已在进行压缩，请稍候（完成后会报告结果）。',
diff --git a/tests/bridge.test.ts b/tests/bridge.test.ts
index c03e8ba..5b33af4 100644
--- a/tests/bridge.test.ts
+++ b/tests/bridge.test.ts
@@ -912,11 +912,11 @@ test('/compact compacts bound session and reports result', async () => {
       roots: () => [agent],
       get: (id: ReturnType<typeof SessionId>) => (String(id) === sessionId ? agent : undefined),
     },
-    compaction: {
-      compactNow: async () => ({
-        shadowedSeqs: [1, 2, 3, 4],
-        shadowedTokenCount: 12_345,
-        summarySeq: 9,
+    commands: {
+      find: () => true,
+      execute: async () => ({
+        commandId: 'cmd-1',
+        result: { kind: 'success', text: 'Compacted 4 history items (~12345 tokens).' },
       }),
     },
     on() { return () => {} },
@@ -962,10 +962,15 @@ test('/compact busy agent replies COMPACT_BUSY without starting', async () => {
       roots: () => [agent],
       get: (id: ReturnType<typeof SessionId>) => (String(id) === sessionId ? agent : undefined),
     },
-    compaction: {
-      compactNow: () => {
-        throw Object.assign(new Error('busy'), { code: 'busy' })
-      },
+    commands: {
+      find: () => true,
+      execute: async () => ({
+        commandId: 'cmd-busy',
+        result: {
+          kind: 'error',
+          text: 'Compaction is unavailable because this process has an active compaction, or the agent is not idle.',
+        },
+      }),
     },
     on() { return () => {} },
   }
@@ -987,11 +992,14 @@ test('/compact busy agent replies COMPACT_BUSY without starting', async () => {
   })
   sent.length = 0 // drop the BOUND message; keep only /compact replies
   await bridge.processUpdate(messageUpdate(10, 1, '/compact', 2))
-  assert.equal(sent.length, 1)
-  assert.equal(sent[0]!.text, MSG.COMPACT_BUSY)
+  assert.ok(sent.some((m) => m.text.includes('已开始压缩')), 'ack sent')
+  for (let i = 0; i < 100 && !sent.some((m) => m.text.includes(MSG.COMPACT_BUSY)); i++) {
+    await new Promise((r) => setTimeout(r, 5))
+  }
+  assert.ok(sent.some((m) => m.text === MSG.COMPACT_BUSY), 'busy notice arrives')
 })
 
-test('/compact without compaction engine reports unavailable', async () => {
+test('/compact without registered /compact command reports unavailable', async () => {
   const sent: SentMessage[] = []
   const followups: UserMessage[] = []
   const sessionId = 'live-noeng'
@@ -1003,6 +1011,9 @@ test('/compact without compaction engine reports unavailable', async () => {
       roots: () => [agent],
       get: (id: ReturnType<typeof SessionId>) => (String(id) === sessionId ? agent : undefined),
     },
+    commands: {
+      find: () => undefined, // command not registered on this host
+    },
     on() { return () => {} },
   }
   const bridge = new TelegramBridge(ctx as any, {