diff --git a/.gitignore b/.gitignore
index d8d27a7ae..9de5af241 100644
--- a/.gitignore
+++ b/.gitignore
@@ -66,5 +66,6 @@ artifacts/
 docs/pr-session-notes-*.md
 
 .cursor/
+.claude/
 .pnpm-store/
 package-lock.json
diff --git a/electron/api/routes/channels.ts b/electron/api/routes/channels.ts
index 0b3c06d0d..6c9267466 100644
--- a/electron/api/routes/channels.ts
+++ b/electron/api/routes/channels.ts
@@ -33,7 +33,9 @@ import {
 import {
   computeChannelRuntimeStatus,
   pickChannelRuntimeStatus,
+  type ChannelConnectionStatus,
   type ChannelRuntimeAccountSnapshot,
+  type GatewayHealthState,
 } from '../../utils/channel-status';
 import {
   OPENCLAW_WECHAT_CHANNEL_TYPE,
@@ -65,6 +67,8 @@ import {
   normalizeWhatsAppMessagingTarget,
 } from '../../utils/openclaw-sdk';
 import { logger } from '../../utils/logger';
+import { buildGatewayHealthSummary } from '../../utils/gateway-health';
+import type { GatewayHealthSummary } from '../../gateway/manager';
 
 // listWhatsAppDirectory*FromConfig were removed from openclaw's public exports
 // in 2026.3.23-1.  No-op stubs; WhatsApp target picker uses session discovery.
@@ -405,7 +409,8 @@ interface ChannelAccountView {
   running: boolean;
   linked: boolean;
   lastError?: string;
-  status: 'connected' | 'connecting' | 'disconnected' | 'error';
+  status: ChannelConnectionStatus;
+  statusReason?: string;
   isDefault: boolean;
   agentId?: string;
 }
@@ -413,10 +418,34 @@ interface ChannelAccountView {
 interface ChannelAccountsView {
   channelType: string;
   defaultAccountId: string;
-  status: 'connected' | 'connecting' | 'disconnected' | 'error';
+  status: ChannelConnectionStatus;
+  statusReason?: string;
   accounts: ChannelAccountView[];
 }
 
+export function getChannelStatusDiagnostics(): {
+  lastChannelsStatusOkAt?: number;
+  lastChannelsStatusFailureAt?: number;
+} {
+  return {
+    lastChannelsStatusOkAt,
+    lastChannelsStatusFailureAt,
+  };
+}
+
+function gatewayHealthStateForChannels(
+  gatewayHealthState: GatewayHealthState,
+): GatewayHealthState | undefined {
+  return gatewayHealthState === 'healthy' ? undefined : gatewayHealthState;
+}
+
+function overlayStatusReason(
+  gatewayHealth: GatewayHealthSummary,
+  fallbackReason: string,
+): string {
+  return gatewayHealth.reasons[0] || fallbackReason;
+}
+
 function buildGatewayStatusSnapshot(status: GatewayChannelStatusPayload | null): string {
   if (!status?.channelAccounts) return 'none';
   const entries = Object.entries(status.channelAccounts);
@@ -480,11 +509,13 @@ type DirectoryEntry = {
 const CHANNEL_TARGET_CACHE_TTL_MS = 60_000;
 const CHANNEL_TARGET_CACHE_ENABLED = process.env.VITEST !== 'true';
 const channelTargetCache = new Map<string, { expiresAt: number; targets: ChannelTargetOptionView[] }>();
+let lastChannelsStatusOkAt: number | undefined;
+let lastChannelsStatusFailureAt: number | undefined;
 
-async function buildChannelAccountsView(
+export async function buildChannelAccountsView(
   ctx: HostApiContext,
   options?: { probe?: boolean },
-): Promise<ChannelAccountsView[]> {
+): Promise<{ channels: ChannelAccountsView[]; gatewayHealth: GatewayHealthSummary }> {
   const startedAt = Date.now();
   // Read config once and share across all sub-calls (was 5 readFile calls before).
   const openClawConfig = await readOpenClawConfig();
@@ -507,17 +538,32 @@ async function buildChannelAccountsView(
       { probe },
       probe ? 5000 : 8000,
     );
+    lastChannelsStatusOkAt = Date.now();
     logger.info(
       `[channels.accounts] channels.status probe=${probe ? '1' : '0'} elapsedMs=${Date.now() - rpcStartedAt} snapshot=${buildGatewayStatusSnapshot(gatewayStatus)}`
     );
   } catch {
     const probe = options?.probe === true;
+    lastChannelsStatusFailureAt = Date.now();
     logger.warn(
       `[channels.accounts] channels.status probe=${probe ? '1' : '0'} failed after ${Date.now() - startedAt}ms`
     );
     gatewayStatus = null;
   }
 
+  const gatewayDiagnostics = ctx.gatewayManager.getDiagnostics?.() ?? {
+    consecutiveHeartbeatMisses: 0,
+    consecutiveRpcFailures: 0,
+  };
+  const gatewayHealth = buildGatewayHealthSummary({
+    status: ctx.gatewayManager.getStatus(),
+    diagnostics: gatewayDiagnostics,
+    lastChannelsStatusOkAt,
+    lastChannelsStatusFailureAt,
+    platform: process.platform,
+  });
+  const gatewayHealthState = gatewayHealthStateForChannels(gatewayHealth.state);
+
   const channelTypes = new Set<string>([
     ...configuredChannels,
     ...Object.keys(configuredAccounts),
@@ -566,7 +612,9 @@ async function buildChannelAccountsView(
     const accounts: ChannelAccountView[] = accountIds.map((accountId) => {
       const runtime = runtimeAccounts.find((item) => item.accountId === accountId);
       const runtimeSnapshot: ChannelRuntimeAccountSnapshot = runtime ?? {};
-      const status = computeChannelRuntimeStatus(runtimeSnapshot);
+      const status = computeChannelRuntimeStatus(runtimeSnapshot, {
+        gatewayHealthState,
+      });
       return {
         accountId,
         name: runtime?.name || accountId,
@@ -576,6 +624,11 @@ async function buildChannelAccountsView(
         linked: runtime?.linked === true,
         lastError: typeof runtime?.lastError === 'string' ? runtime.lastError : undefined,
         status,
+        statusReason: status === 'degraded'
+          ? overlayStatusReason(gatewayHealth, 'gateway_degraded')
+          : status === 'error'
+            ? 'runtime_error'
+            : undefined,
         isDefault: accountId === defaultAccountId,
         agentId: agentsSnapshot.channelAccountOwners[`${rawChannelType}:${accountId}`],
       };
@@ -585,10 +638,32 @@ async function buildChannelAccountsView(
       return left.accountId.localeCompare(right.accountId);
     });
 
+    const visibleAccountSnapshots: ChannelRuntimeAccountSnapshot[] = accounts.map((account) => ({
+      connected: account.connected,
+      running: account.running,
+      linked: account.linked,
+      lastError: account.lastError,
+    }));
+    const hasRuntimeError = visibleAccountSnapshots.some((account) => typeof account.lastError === 'string' && account.lastError.trim())
+      || Boolean(channelSummary?.error?.trim() || channelSummary?.lastError?.trim());
+    const baseGroupStatus = pickChannelRuntimeStatus(visibleAccountSnapshots, channelSummary);
+    const groupStatus = !gatewayStatus && ctx.gatewayManager.getStatus().state === 'running'
+      ? 'degraded'
+      : gatewayHealthState && !hasRuntimeError && baseGroupStatus === 'connected'
+        ? 'degraded'
+        : pickChannelRuntimeStatus(visibleAccountSnapshots, channelSummary, {
+          gatewayHealthState,
+        });
+
     channels.push({
       channelType: uiChannelType,
       defaultAccountId,
-      status: pickChannelRuntimeStatus(runtimeAccounts, channelSummary),
+      status: groupStatus,
+      statusReason: !gatewayStatus && ctx.gatewayManager.getStatus().state === 'running'
+        ? 'channels_status_timeout'
+        : groupStatus === 'degraded'
+          ? overlayStatusReason(gatewayHealth, 'gateway_degraded')
+        : undefined,
       accounts,
     });
   }
@@ -597,7 +672,7 @@ async function buildChannelAccountsView(
   logger.info(
     `[channels.accounts] response probe=${options?.probe === true ? '1' : '0'} elapsedMs=${Date.now() - startedAt} view=${sorted.map((item) => `${item.channelType}:${item.status}`).join(',')}`
   );
-  return sorted;
+  return { channels: sorted, gatewayHealth };
 }
 
 function buildChannelTargetLabel(baseLabel: string, value: string): string {
@@ -1193,8 +1268,8 @@ export async function handleChannelRoutes(
     try {
       const probe = url.searchParams.get('probe') === '1';
       logger.info(`[channels.accounts] request probe=${probe ? '1' : '0'}`);
-      const channels = await buildChannelAccountsView(ctx, { probe });
-      sendJson(res, 200, { success: true, channels });
+      const { channels, gatewayHealth } = await buildChannelAccountsView(ctx, { probe });
+      sendJson(res, 200, { success: true, channels, gatewayHealth });
     } catch (error) {
       sendJson(res, 500, { success: false, error: String(error) });
     }
diff --git a/electron/api/routes/diagnostics.ts b/electron/api/routes/diagnostics.ts
new file mode 100644
index 000000000..268e4ecd2
--- /dev/null
+++ b/electron/api/routes/diagnostics.ts
@@ -0,0 +1,86 @@
+import { open } from 'node:fs/promises';
+import { join } from 'node:path';
+import type { IncomingMessage, ServerResponse } from 'http';
+import { logger } from '../../utils/logger';
+import { getOpenClawConfigDir } from '../../utils/paths';
+import { buildGatewayHealthSummary } from '../../utils/gateway-health';
+import type { HostApiContext } from '../context';
+import { sendJson } from '../route-utils';
+import { buildChannelAccountsView, getChannelStatusDiagnostics } from './channels';
+
+const DEFAULT_TAIL_LINES = 200;
+
+async function readTail(filePath: string, tailLines = DEFAULT_TAIL_LINES): Promise<string> {
+  const safeTailLines = Math.max(1, Math.floor(tailLines));
+  try {
+    const file = await open(filePath, 'r');
+    try {
+      const stat = await file.stat();
+      if (stat.size === 0) return '';
+
+      const chunkSize = 64 * 1024;
+      let position = stat.size;
+      let content = '';
+      let lineCount = 0;
+
+      while (position > 0 && lineCount <= safeTailLines) {
+        const bytesToRead = Math.min(chunkSize, position);
+        position -= bytesToRead;
+        const buffer = Buffer.allocUnsafe(bytesToRead);
+        const { bytesRead } = await file.read(buffer, 0, bytesToRead, position);
+        content = `${buffer.subarray(0, bytesRead).toString('utf-8')}${content}`;
+        lineCount = content.split('\n').length - 1;
+      }
+
+      const lines = content.split('\n');
+      return lines.length <= safeTailLines ? content : lines.slice(-safeTailLines).join('\n');
+    } finally {
+      await file.close();
+    }
+  } catch {
+    return '';
+  }
+}
+
+export async function handleDiagnosticsRoutes(
+  req: IncomingMessage,
+  res: ServerResponse,
+  url: URL,
+  ctx: HostApiContext,
+): Promise<boolean> {
+  if (url.pathname === '/api/diagnostics/gateway-snapshot' && req.method === 'GET') {
+    try {
+      const { channels } = await buildChannelAccountsView(ctx, { probe: false });
+      const diagnostics = ctx.gatewayManager.getDiagnostics?.() ?? {
+        consecutiveHeartbeatMisses: 0,
+        consecutiveRpcFailures: 0,
+      };
+      const channelStatusDiagnostics = getChannelStatusDiagnostics();
+      const gateway = {
+        ...ctx.gatewayManager.getStatus(),
+        ...buildGatewayHealthSummary({
+          status: ctx.gatewayManager.getStatus(),
+          diagnostics,
+          lastChannelsStatusOkAt: channelStatusDiagnostics.lastChannelsStatusOkAt,
+          lastChannelsStatusFailureAt: channelStatusDiagnostics.lastChannelsStatusFailureAt,
+          platform: process.platform,
+        }),
+      };
+      const openClawDir = getOpenClawConfigDir();
+      sendJson(res, 200, {
+        capturedAt: Date.now(),
+        platform: process.platform,
+        gateway,
+        channels,
+        clawxLogTail: await logger.readLogFile(DEFAULT_TAIL_LINES),
+        gatewayLogTail: await readTail(join(openClawDir, 'logs', 'gateway.log')),
+        gatewayErrLogTail: await readTail(join(openClawDir, 'logs', 'gateway.err.log')),
+      });
+    } catch (error) {
+      sendJson(res, 500, { success: false, error: String(error) });
+    }
+    return true;
+  }
+
+  return false;
+}
diff --git a/electron/api/server.ts b/electron/api/server.ts
index a6af24683..4e16b37c0 100644
--- a/electron/api/server.ts
+++ b/electron/api/server.ts
@@ -15,6 +15,7 @@ import { handleSkillRoutes } from './routes/skills';
 import { handleFileRoutes } from './routes/files';
 import { handleSessionRoutes } from './routes/sessions';
 import { handleCronRoutes } from './routes/cron';
+import { handleDiagnosticsRoutes } from './routes/diagnostics';
 import { sendJson, setCorsHeaders, requireJsonContentType } from './route-utils';
 
 type RouteHandler = (
@@ -35,6 +36,7 @@ const routeHandlers: RouteHandler[] = [
   handleFileRoutes,
   handleSessionRoutes,
   handleCronRoutes,
+  handleDiagnosticsRoutes,
   handleLogRoutes,
   handleUsageRoutes,
 ];
diff --git a/electron/gateway/manager.ts b/electron/gateway/manager.ts
index 918813d98..df6e40c1f 100644
--- a/electron/gateway/manager.ts
+++ b/electron/gateway/manager.ts
@@ -65,6 +65,40 @@ export interface GatewayStatus {
   gatewayReady?: boolean;
 }
 
+export type GatewayHealthState = 'healthy' | 'degraded' | 'unresponsive';
+
+export interface GatewayHealthSummary {
+  state: GatewayHealthState;
+  reasons: string[];
+  consecutiveHeartbeatMisses: number;
+  lastAliveAt?: number;
+  lastRpcSuccessAt?: number;
+  lastRpcFailureAt?: number;
+  lastRpcFailureMethod?: string;
+  lastChannelsStatusOkAt?: number;
+  lastChannelsStatusFailureAt?: number;
+}
+
+export interface GatewayDiagnosticsSnapshot {
+  lastAliveAt?: number;
+  lastRpcSuccessAt?: number;
+  lastRpcFailureAt?: number;
+  lastRpcFailureMethod?: string;
+  lastHeartbeatTimeoutAt?: number;
+  consecutiveHeartbeatMisses: number;
+  lastSocketCloseAt?: number;
+  lastSocketCloseCode?: number;
+  consecutiveRpcFailures: number;
+}
+
+function isTransportRpcFailure(error: unknown): boolean {
+  const message = error instanceof Error ? error.message : String(error);
+  return message.includes('RPC timeout:')
+    || message.includes('Gateway not connected')
+    || message.includes('Gateway stopped')
+    || message.includes('Failed to send RPC request:');
+}
+
 /**
  * Gateway Manager Events
  */
@@ -126,6 +160,10 @@ export class GatewayManager extends EventEmitter {
   /** Set by scheduleReconnect() before calling start() to signal auto-reconnect. */
   private isAutoReconnectStart = false;
   private gatewayReadyFallbackTimer: NodeJS.Timeout | null = null;
+  private diagnostics: GatewayDiagnosticsSnapshot = {
+    consecutiveHeartbeatMisses: 0,
+    consecutiveRpcFailures: 0,
+  };
 
   constructor(config?: Partial<ReconnectConfig>) {
     super();
@@ -197,6 +235,10 @@ export class GatewayManager extends EventEmitter {
     return this.stateController.getStatus();
   }
 
+  getDiagnostics(): GatewayDiagnosticsSnapshot {
+    return { ...this.diagnostics };
+  }
+
   /**
    * Check if Gateway is connected and ready
    */
@@ -413,6 +455,7 @@ export class GatewayManager extends EventEmitter {
 
     this.restartController.resetDeferredRestart();
     this.isAutoReconnectStart = false;
+    this.diagnostics.consecutiveHeartbeatMisses = 0;
     this.setStatus({ state: 'stopped', error: undefined, pid: undefined, connectedAt: undefined, uptime: undefined, gatewayReady: undefined });
   }
 
@@ -712,7 +755,7 @@ export class GatewayManager extends EventEmitter {
    * Uses OpenClaw protocol format: { type: "req", id: "...", method: "...", params: {...} }
    */
   async rpc<T>(method: string, params?: unknown, timeoutMs = 30000): Promise<T> {
-    return new Promise((resolve, reject) => {
+    return await new Promise<T>((resolve, reject) => {
       if (!this.ws || this.ws.readyState !== WebSocket.OPEN) {
         reject(new Error('Gateway not connected'));
         return;
@@ -745,6 +788,14 @@ export class GatewayManager extends EventEmitter {
       } catch (error) {
         rejectPendingGatewayRequest(this.pendingRequests, id, new Error(`Failed to send RPC request: ${error}`));
       }
+    }).then((result) => {
+      this.recordRpcSuccess();
+      return result;
+    }).catch((error) => {
+      if (isTransportRpcFailure(error)) {
+        this.recordRpcFailure(method);
+      }
+      throw error;
     });
   }
 
@@ -782,6 +833,32 @@ export class GatewayManager extends EventEmitter {
     }
   }
 
+  private recordGatewayAlive(): void {
+    this.diagnostics.lastAliveAt = Date.now();
+    this.diagnostics.consecutiveHeartbeatMisses = 0;
+  }
+
+  private recordRpcSuccess(): void {
+    this.diagnostics.lastRpcSuccessAt = Date.now();
+    this.diagnostics.consecutiveRpcFailures = 0;
+  }
+
+  private recordRpcFailure(method: string): void {
+    this.diagnostics.lastRpcFailureAt = Date.now();
+    this.diagnostics.lastRpcFailureMethod = method;
+    this.diagnostics.consecutiveRpcFailures += 1;
+  }
+
+  private recordHeartbeatTimeout(consecutiveMisses: number): void {
+    this.diagnostics.lastHeartbeatTimeoutAt = Date.now();
+    this.diagnostics.consecutiveHeartbeatMisses = consecutiveMisses;
+  }
+
+  private recordSocketClose(code: number): void {
+    this.diagnostics.lastSocketCloseAt = Date.now();
+    this.diagnostics.lastSocketCloseCode = code;
+  }
+
   /**
    * Start Gateway process
    * Uses OpenClaw npm package from node_modules (dev) or resources (production)
@@ -878,7 +955,9 @@ export class GatewayManager extends EventEmitter {
         this.ws = ws;
         ws.on('pong', () => {
           this.connectionMonitor.markAlive('pong');
+          this.recordGatewayAlive();
         });
+        this.recordGatewayAlive();
         this.setStatus({
           state: 'running',
           port,
@@ -892,6 +971,8 @@ export class GatewayManager extends EventEmitter {
       },
       onCloseAfterHandshake: (closeCode) => {
         this.connectionMonitor.clear();
+        this.recordSocketClose(closeCode);
+        this.diagnostics.consecutiveHeartbeatMisses = 0;
         if (this.status.state === 'running') {
           this.setStatus({ state: 'stopped' });
           // On Windows, skip reconnect from WS close.  The Gateway is a local
@@ -916,6 +997,7 @@ export class GatewayManager extends EventEmitter {
    */
   private handleMessage(message: unknown): void {
     this.connectionMonitor.markAlive('message');
+    this.recordGatewayAlive();
 
     if (typeof message !== 'object' || message === null) {
       logger.debug('Received non-object Gateway message');
@@ -986,24 +1068,25 @@ export class GatewayManager extends EventEmitter {
         }
       },
       onHeartbeatTimeout: ({ consecutiveMisses, timeoutMs }) => {
-        // Heartbeat timeout is observability-only.  We intentionally do NOT
-        // terminate the socket or trigger reconnection here because:
-        //
-        // 1. If the gateway process dies → child.on('exit') fires reliably.
-        // 2. If the socket disconnects  → ws.on('close') fires reliably.
-        // 3. If the gateway event loop is blocked (skills scanning, GC,
-        //    antivirus) → pong is delayed but the process and connection
-        //    are still valid.  Terminating the socket would cause a
-        //    cascading restart loop for no reason.
-        //
-        // The only scenario ping/pong could catch (silent half-open TCP on
-        // localhost) is practically impossible.  So we just log.
+        this.recordHeartbeatTimeout(consecutiveMisses);
         const pid = this.process?.pid ?? 'unknown';
+        const isWindows = process.platform === 'win32';
+        const shouldAttemptRecovery = !isWindows && this.shouldReconnect && this.status.state === 'running';
         logger.warn(
           `Gateway heartbeat: ${consecutiveMisses} consecutive pong misses ` +
-            `(timeout=${timeoutMs}ms, pid=${pid}, state=${this.status.state}). ` +
-            `No action taken — relying on process exit and socket close events.`,
+            `(timeout=${timeoutMs}ms, pid=${pid}, state=${this.status.state}, autoReconnect=${this.shouldReconnect}).`,
         );
+        if (!shouldAttemptRecovery) {
+          const reason = isWindows
+            ? 'platform=win32'
+            : 'lifecycle is not in auto-recoverable running state';
+          logger.warn(`Gateway heartbeat recovery skipped (${reason})`);
+          return;
+        }
+        logger.warn('Gateway heartbeat recovery: restarting unresponsive gateway process');
+        void this.restart().catch((error) => {
+          logger.warn('Gateway heartbeat recovery failed:', error);
+        });
       },
     });
   }
diff --git a/electron/utils/channel-status.ts b/electron/utils/channel-status.ts
index 947cb3672..131f44f06 100644
--- a/electron/utils/channel-status.ts
+++ b/electron/utils/channel-status.ts
@@ -1,4 +1,5 @@
-export type ChannelConnectionStatus = 'connected' | 'connecting' | 'disconnected' | 'error';
+export type GatewayHealthState = 'healthy' | 'degraded' | 'unresponsive';
+export type ChannelConnectionStatus = 'connected' | 'connecting' | 'degraded' | 'disconnected' | 'error';
 
 export interface ChannelRuntimeAccountSnapshot {
   connected?: boolean;
@@ -19,6 +20,10 @@ export interface ChannelRuntimeSummarySnapshot {
   lastError?: string | null;
 }
 
+export interface ChannelHealthOverlay {
+  gatewayHealthState?: GatewayHealthState;
+}
+
 const RECENT_ACTIVITY_MS = 10 * 60 * 1000;
 
 function hasNonEmptyError(value: string | null | undefined): boolean {
@@ -74,9 +79,11 @@ export function isChannelRuntimeConnected(
 
 export function computeChannelRuntimeStatus(
   account: ChannelRuntimeAccountSnapshot,
+  healthOverlay?: ChannelHealthOverlay,
 ): ChannelConnectionStatus {
-  if (isChannelRuntimeConnected(account)) return 'connected';
   if (hasChannelRuntimeError(account)) return 'error';
+  if (healthOverlay?.gatewayHealthState && healthOverlay.gatewayHealthState !== 'healthy') return 'degraded';
+  if (isChannelRuntimeConnected(account)) return 'connected';
   if (account.running === true) return 'connecting';
   return 'disconnected';
 }
@@ -84,6 +91,7 @@ export function computeChannelRuntimeStatus(
 export function pickChannelRuntimeStatus(
   accounts: ChannelRuntimeAccountSnapshot[],
   summary?: ChannelRuntimeSummarySnapshot,
+  healthOverlay?: ChannelHealthOverlay,
 ): ChannelConnectionStatus {
   if (accounts.some((account) => isChannelRuntimeConnected(account))) {
     return 'connected';
@@ -93,6 +101,10 @@ export function pickChannelRuntimeStatus(
     return 'error';
   }
 
+  if (healthOverlay?.gatewayHealthState && healthOverlay.gatewayHealthState !== 'healthy') {
+    return 'degraded';
+  }
+
   if (accounts.some((account) => account.running === true)) {
     return 'connecting';
   }
diff --git a/electron/utils/gateway-health.ts b/electron/utils/gateway-health.ts
new file mode 100644
index 000000000..8fb1a9b87
--- /dev/null
+++ b/electron/utils/gateway-health.ts
@@ -0,0 +1,81 @@
+import type {
+  GatewayDiagnosticsSnapshot,
+  GatewayHealthSummary,
+  GatewayStatus,
+} from '../gateway/manager';
+
+type BuildGatewayHealthSummaryOptions = {
+  status: GatewayStatus;
+  diagnostics: GatewayDiagnosticsSnapshot;
+  lastChannelsStatusOkAt?: number;
+  lastChannelsStatusFailureAt?: number;
+  platform?: string;
+  now?: number;
+};
+
+const CHANNEL_STATUS_FAILURE_WINDOW_MS = 2 * 60_000;
+const HEARTBEAT_MISS_THRESHOLD_DEFAULT = 3;
+const HEARTBEAT_MISS_THRESHOLD_WIN = 5;
+
+export function buildGatewayHealthSummary(
+  options: BuildGatewayHealthSummaryOptions,
+): GatewayHealthSummary {
+  const now = options.now ?? Date.now();
+  const reasons = new Set<string>();
+  const heartbeatThreshold = options.platform === 'win32'
+    ? HEARTBEAT_MISS_THRESHOLD_WIN
+    : HEARTBEAT_MISS_THRESHOLD_DEFAULT;
+
+  const channelStatusFailureIsRecent =
+    typeof options.lastChannelsStatusFailureAt === 'number'
+    && now - options.lastChannelsStatusFailureAt <= CHANNEL_STATUS_FAILURE_WINDOW_MS
+    && (
+      typeof options.lastChannelsStatusOkAt !== 'number'
+      || options.lastChannelsStatusFailureAt > options.lastChannelsStatusOkAt
+    );
+
+  if (options.status.state !== 'running') {
+    reasons.add(options.status.state === 'error' ? 'gateway_error' : 'gateway_not_running');
+    return {
+      state: 'degraded',
+      reasons: [...reasons],
+      consecutiveHeartbeatMisses: options.diagnostics.consecutiveHeartbeatMisses,
+      lastAliveAt: options.diagnostics.lastAliveAt,
+      lastRpcSuccessAt: options.diagnostics.lastRpcSuccessAt,
+      lastRpcFailureAt: options.diagnostics.lastRpcFailureAt,
+      lastRpcFailureMethod: options.diagnostics.lastRpcFailureMethod,
+      lastChannelsStatusOkAt: options.lastChannelsStatusOkAt,
+      lastChannelsStatusFailureAt: options.lastChannelsStatusFailureAt,
+    };
+  }
+
+  if (options.diagnostics.consecutiveHeartbeatMisses >= heartbeatThreshold) {
+    reasons.add('gateway_unresponsive');
+  } else if (options.diagnostics.consecutiveHeartbeatMisses > 0) {
+    reasons.add('gateway_degraded');
+  }
+
+  if (options.diagnostics.consecutiveRpcFailures > 0) {
+    reasons.add('rpc_timeout');
+  }
+
+  if (channelStatusFailureIsRecent) {
+    reasons.add('channels_status_timeout');
+  }
+
+  return {
+    state: reasons.has('gateway_unresponsive')
+      ? 'unresponsive'
+      : reasons.size > 0
+        ? 'degraded'
+        : 'healthy',
+    reasons: [...reasons],
+    consecutiveHeartbeatMisses: options.diagnostics.consecutiveHeartbeatMisses,
+    lastAliveAt: options.diagnostics.lastAliveAt,
+    lastRpcSuccessAt: options.diagnostics.lastRpcSuccessAt,
+    lastRpcFailureAt: options.diagnostics.lastRpcFailureAt,
+    lastRpcFailureMethod: options.diagnostics.lastRpcFailureMethod,
+    lastChannelsStatusOkAt: options.lastChannelsStatusOkAt,
+    lastChannelsStatusFailureAt: options.lastChannelsStatusFailureAt,
+  };
+}
diff --git a/electron/utils/openclaw-auth.ts b/electron/utils/openclaw-auth.ts
index 991e1f4fd..fee0bc9af 100644
--- a/electron/utils/openclaw-auth.ts
+++ b/electron/utils/openclaw-auth.ts
@@ -1634,6 +1634,51 @@ export async function sanitizeOpenClawConfig(): Promise<void> {
         pluginsObj.allow = allowArr;
       }
 
+      // ── acpx legacy config/install cleanup ─────────────────────
+      // Older OpenClaw releases allowed plugins.entries.acpx.config.command
+      // and expectedVersion overrides. Current bundled acpx schema rejects
+      // them, which causes the Gateway to fail validation before startup.
+      // Strip those keys and drop stale installs metadata that still points
+      // at an older bundled OpenClaw tree so the current bundled plugin can
+      // be re-registered cleanly.
+      const acpxEntry = isPlainRecord(pEntries.acpx) ? pEntries.acpx as Record<string, unknown> : null;
+      const acpxConfig = acpxEntry && isPlainRecord(acpxEntry.config)
+        ? acpxEntry.config as Record<string, unknown>
+        : null;
+      if (acpxConfig) {
+        for (const legacyKey of ['command', 'expectedVersion'] as const) {
+          if (legacyKey in acpxConfig) {
+            delete acpxConfig[legacyKey];
+            modified = true;
+            console.log(`[sanitize] Removed legacy plugins.entries.acpx.config.${legacyKey}`);
+          }
+        }
+      }
+
+      const installs = isPlainRecord(pluginsObj.installs) ? pluginsObj.installs as Record<string, unknown> : null;
+      const acpxInstall = installs && isPlainRecord(installs.acpx) ? installs.acpx as Record<string, unknown> : null;
+      if (acpxInstall) {
+        const currentBundledAcpxDir = join(getOpenClawResolvedDir(), 'dist', 'extensions', 'acpx').replace(/\\/g, '/');
+        const sourcePath = typeof acpxInstall.sourcePath === 'string' ? acpxInstall.sourcePath : '';
+        const installPath = typeof acpxInstall.installPath === 'string' ? acpxInstall.installPath : '';
+        const normalizedSourcePath = sourcePath.replace(/\\/g, '/');
+        const normalizedInstallPath = installPath.replace(/\\/g, '/');
+        const pointsAtDifferentBundledTree = [normalizedSourcePath, normalizedInstallPath].some(
+          (candidate) => candidate.includes('/node_modules/.pnpm/openclaw@') && candidate !== currentBundledAcpxDir,
+        );
+        const pointsAtMissingPath = (sourcePath && !(await fileExists(sourcePath)))
+          || (installPath && !(await fileExists(installPath)));
+
+        if (pointsAtDifferentBundledTree || pointsAtMissingPath) {
+          delete installs.acpx;
+          if (Object.keys(installs).length === 0) {
+            delete pluginsObj.installs;
+          }
+          modified = true;
+          console.log('[sanitize] Removed stale plugins.installs.acpx metadata');
+        }
+      }
+
       const installedFeishuId = await resolveInstalledFeishuPluginId();
       const configuredFeishuId =
         FEISHU_PLUGIN_ID_CANDIDATES.find((id) => allowArr.includes(id))
diff --git a/src/i18n/locales/en/channels.json b/src/i18n/locales/en/channels.json
index de1e5b235..0f812d8fa 100644
--- a/src/i18n/locales/en/channels.json
+++ b/src/i18n/locales/en/channels.json
@@ -62,6 +62,7 @@
         "connectionStatus": {
             "connected": "Connected",
             "connecting": "Connecting",
+            "degraded": "Degraded",
             "disconnected": "Disconnected",
             "error": "Error"
         },
@@ -99,6 +100,30 @@
         "saveAndConnect": "Save & Connect",
         "envVar": "Environment Variable: {{var}}"
     },
+    "health": {
+        "state": {
+            "degraded": "Gateway degraded",
+            "unresponsive": "Gateway unresponsive"
+        },
+        "reasons": {
+            "gateway_degraded": "Gateway heartbeat recently degraded.",
+            "gateway_unresponsive": "Gateway control plane appears unresponsive.",
+            "channels_status_timeout": "Channel runtime status probe timed out.",
+            "rpc_timeout": "Recent Gateway RPC calls timed out.",
+            "gateway_not_running": "Gateway is not running.",
+            "gateway_error": "Gateway is in an error state.",
+            "runtime_error": "Channel runtime reported an error."
+        },
+        "restartGateway": "Restart Gateway",
+        "copyDiagnostics": "Copy Diagnostics",
+        "viewDiagnostics": "View Diagnostics",
+        "hideDiagnostics": "Hide Diagnostics",
+        "diagnosticsTitle": "Gateway Diagnostics Snapshot",
+        "diagnosticsCopied": "Diagnostics copied to clipboard",
+        "diagnosticsCopyFailed": "Failed to collect diagnostics: {{error}}",
+        "restartTriggered": "Gateway restart requested",
+        "restartFailed": "Failed to restart gateway: {{error}}"
+    },
     "meta": {
         "telegram": {
             "description": "Connect Telegram using a bot token from @BotFather",
diff --git a/src/i18n/locales/ja/channels.json b/src/i18n/locales/ja/channels.json
index 40396c801..94af46e19 100644
--- a/src/i18n/locales/ja/channels.json
+++ b/src/i18n/locales/ja/channels.json
@@ -62,6 +62,7 @@
         "connectionStatus": {
             "connected": "接続済み",
             "connecting": "接続中",
+            "degraded": "劣化中",
             "disconnected": "未接続",
             "error": "異常"
         },
@@ -99,6 +100,30 @@
         "saveAndConnect": "保存して接続",
         "envVar": "環境変数: {{var}}"
     },
+    "health": {
+        "state": {
+            "degraded": "ゲートウェイ劣化",
+            "unresponsive": "ゲートウェイ無応答"
+        },
+        "reasons": {
+            "gateway_degraded": "ゲートウェイのハートビートに劣化が見られます。",
+            "gateway_unresponsive": "ゲートウェイの制御プレーンが無応答です。",
+            "channels_status_timeout": "チャンネル状態の問い合わせがタイムアウトしました。",
+            "rpc_timeout": "最近のゲートウェイ RPC がタイムアウトしました。",
+            "gateway_not_running": "ゲートウェイは起動していません。",
+            "gateway_error": "ゲートウェイはエラー状態です。",
+            "runtime_error": "チャンネルランタイムがエラーを返しました。"
+        },
+        "restartGateway": "ゲートウェイを再起動",
+        "copyDiagnostics": "診断をコピー",
+        "viewDiagnostics": "診断を表示",
+        "hideDiagnostics": "診断を隠す",
+        "diagnosticsTitle": "ゲートウェイ診断スナップショット",
+        "diagnosticsCopied": "診断をクリップボードにコピーしました",
+        "diagnosticsCopyFailed": "診断の取得に失敗しました: {{error}}",
+        "restartTriggered": "ゲートウェイの再起動を要求しました",
+        "restartFailed": "ゲートウェイの再起動に失敗しました: {{error}}"
+    },
     "meta": {
         "telegram": {
             "description": "@BotFather からのボットトークンを使用して Telegram に接続します",
diff --git a/src/i18n/locales/zh/channels.json b/src/i18n/locales/zh/channels.json
index c39848545..1ed42d73c 100644
--- a/src/i18n/locales/zh/channels.json
+++ b/src/i18n/locales/zh/channels.json
@@ -62,6 +62,7 @@
         "connectionStatus": {
             "connected": "已连接",
             "connecting": "连接中",
+            "degraded": "异常降级",
             "disconnected": "未连接",
             "error": "异常"
         },
@@ -99,6 +100,30 @@
         "saveAndConnect": "保存并连接",
         "envVar": "环境变量: {{var}}"
     },
+    "health": {
+        "state": {
+            "degraded": "网关状态异常",
+            "unresponsive": "网关无响应"
+        },
+        "reasons": {
+            "gateway_degraded": "网关心跳近期出现异常。",
+            "gateway_unresponsive": "网关控制面看起来已经无响应。",
+            "channels_status_timeout": "频道运行时状态探测超时。",
+            "rpc_timeout": "最近的网关 RPC 调用发生超时。",
+            "gateway_not_running": "网关当前未运行。",
+            "gateway_error": "网关当前处于错误状态。",
+            "runtime_error": "频道运行时返回了错误。"
+        },
+        "restartGateway": "重启网关",
+        "copyDiagnostics": "复制诊断快照",
+        "viewDiagnostics": "查看诊断快照",
+        "hideDiagnostics": "隐藏诊断快照",
+        "diagnosticsTitle": "网关诊断快照",
+        "diagnosticsCopied": "诊断快照已复制到剪贴板",
+        "diagnosticsCopyFailed": "收集诊断快照失败：{{error}}",
+        "restartTriggered": "已请求重启网关",
+        "restartFailed": "重启网关失败：{{error}}"
+    },
     "meta": {
         "telegram": {
             "description": "使用 @BotFather 提供的机器人令牌连接 Telegram",
diff --git a/src/lib/channel-status.ts b/src/lib/channel-status.ts
index 947cb3672..131f44f06 100644
--- a/src/lib/channel-status.ts
+++ b/src/lib/channel-status.ts
@@ -1,4 +1,5 @@
-export type ChannelConnectionStatus = 'connected' | 'connecting' | 'disconnected' | 'error';
+export type GatewayHealthState = 'healthy' | 'degraded' | 'unresponsive';
+export type ChannelConnectionStatus = 'connected' | 'connecting' | 'degraded' | 'disconnected' | 'error';
 
 export interface ChannelRuntimeAccountSnapshot {
   connected?: boolean;
@@ -19,6 +20,10 @@ export interface ChannelRuntimeSummarySnapshot {
   lastError?: string | null;
 }
 
+export interface ChannelHealthOverlay {
+  gatewayHealthState?: GatewayHealthState;
+}
+
 const RECENT_ACTIVITY_MS = 10 * 60 * 1000;
 
 function hasNonEmptyError(value: string | null | undefined): boolean {
@@ -74,9 +79,11 @@ export function isChannelRuntimeConnected(
 
 export function computeChannelRuntimeStatus(
   account: ChannelRuntimeAccountSnapshot,
+  healthOverlay?: ChannelHealthOverlay,
 ): ChannelConnectionStatus {
-  if (isChannelRuntimeConnected(account)) return 'connected';
   if (hasChannelRuntimeError(account)) return 'error';
+  if (healthOverlay?.gatewayHealthState && healthOverlay.gatewayHealthState !== 'healthy') return 'degraded';
+  if (isChannelRuntimeConnected(account)) return 'connected';
   if (account.running === true) return 'connecting';
   return 'disconnected';
 }
@@ -84,6 +91,7 @@ export function computeChannelRuntimeStatus(
 export function pickChannelRuntimeStatus(
   accounts: ChannelRuntimeAccountSnapshot[],
   summary?: ChannelRuntimeSummarySnapshot,
+  healthOverlay?: ChannelHealthOverlay,
 ): ChannelConnectionStatus {
   if (accounts.some((account) => isChannelRuntimeConnected(account))) {
     return 'connected';
@@ -93,6 +101,10 @@ export function pickChannelRuntimeStatus(
     return 'error';
   }
 
+  if (healthOverlay?.gatewayHealthState && healthOverlay.gatewayHealthState !== 'healthy') {
+    return 'degraded';
+  }
+
   if (accounts.some((account) => account.running === true)) {
     return 'connecting';
   }
diff --git a/src/pages/Channels/index.tsx b/src/pages/Channels/index.tsx
index fd3b80026..d9ef5dbff 100644
--- a/src/pages/Channels/index.tsx
+++ b/src/pages/Channels/index.tsx
@@ -1,5 +1,5 @@
 import { useState, useEffect, useCallback, useMemo, useRef } from 'react';
-import { RefreshCw, Trash2, AlertCircle, Plus } from 'lucide-react';
+import { RefreshCw, Trash2, AlertCircle, Plus, Copy, RotateCcw, ChevronDown, ChevronUp } from 'lucide-react';
 import { Button } from '@/components/ui/button';
 import { Badge } from '@/components/ui/badge';
 import { ConfirmDialog } from '@/components/ui/confirm-dialog';
@@ -33,7 +33,8 @@ interface ChannelAccountItem {
   accountId: string;
   name: string;
   configured: boolean;
-  status: 'connected' | 'connecting' | 'disconnected' | 'error';
+  status: 'connected' | 'connecting' | 'degraded' | 'disconnected' | 'error';
+  statusReason?: string;
   lastError?: string;
   isDefault: boolean;
   agentId?: string;
@@ -42,10 +43,51 @@ interface ChannelAccountItem {
 interface ChannelGroupItem {
   channelType: string;
   defaultAccountId: string;
-  status: 'connected' | 'connecting' | 'disconnected' | 'error';
+  status: 'connected' | 'connecting' | 'degraded' | 'disconnected' | 'error';
+  statusReason?: string;
   accounts: ChannelAccountItem[];
 }
 
+interface GatewayHealthSummary {
+  state: 'healthy' | 'degraded' | 'unresponsive';
+  reasons: string[];
+  consecutiveHeartbeatMisses: number;
+  lastAliveAt?: number;
+  lastRpcSuccessAt?: number;
+  lastRpcFailureAt?: number;
+  lastRpcFailureMethod?: string;
+  lastChannelsStatusOkAt?: number;
+  lastChannelsStatusFailureAt?: number;
+}
+
+interface GatewayDiagnosticSnapshot {
+  capturedAt: number;
+  platform: string;
+  gateway: GatewayHealthSummary & Record<string, unknown>;
+  channels: ChannelGroupItem[];
+  clawxLogTail: string;
+  gatewayLogTail: string;
+  gatewayErrLogTail: string;
+}
+
+function isGatewayDiagnosticSnapshot(value: unknown): value is GatewayDiagnosticSnapshot {
+  if (!value || typeof value !== 'object') {
+    return false;
+  }
+
+  const snapshot = value as Record<string, unknown>;
+  return (
+    typeof snapshot.capturedAt === 'number'
+    && typeof snapshot.platform === 'string'
+    && typeof snapshot.gateway === 'object'
+    && snapshot.gateway !== null
+    && Array.isArray(snapshot.channels)
+    && typeof snapshot.clawxLogTail === 'string'
+    && typeof snapshot.gatewayLogTail === 'string'
+    && typeof snapshot.gatewayErrLogTail === 'string'
+  );
+}
+
 interface AgentItem {
   id: string;
   name: string;
@@ -76,11 +118,20 @@ export function Channels() {
   const { t } = useTranslation('channels');
   const gatewayStatus = useGatewayStore((state) => state.status);
   const lastGatewayStateRef = useRef(gatewayStatus.state);
+  const defaultGatewayHealth = useMemo<GatewayHealthSummary>(() => ({
+    state: 'healthy',
+    reasons: [],
+    consecutiveHeartbeatMisses: 0,
+  }), []);
 
   const [loading, setLoading] = useState(true);
   const [error, setError] = useState<string | null>(null);
   const [channelGroups, setChannelGroups] = useState<ChannelGroupItem[]>([]);
   const [agents, setAgents] = useState<AgentItem[]>([]);
+  const [gatewayHealth, setGatewayHealth] = useState<GatewayHealthSummary>(defaultGatewayHealth);
+  const [diagnosticsSnapshot, setDiagnosticsSnapshot] = useState<GatewayDiagnosticSnapshot | null>(null);
+  const [showDiagnostics, setShowDiagnostics] = useState(false);
+  const [diagnosticsLoading, setDiagnosticsLoading] = useState(false);
   const [showConfigModal, setShowConfigModal] = useState(false);
   const [selectedChannelType, setSelectedChannelType] = useState<ChannelType | null>(null);
   const [selectedAccountId, setSelectedAccountId] = useState<string | undefined>(undefined);
@@ -139,18 +190,29 @@ export function Channels() {
         hostApiFetch<{ success: boolean; agents?: AgentItem[]; error?: string }>('/api/agents'),
       ]);
 
-      if (!channelsRes.success) {
-        throw new Error(channelsRes.error || 'Failed to load channels');
+      type ChannelsResponse = {
+        success: boolean;
+        channels?: ChannelGroupItem[];
+        gatewayHealth?: GatewayHealthSummary;
+        error?: string;
+      };
+      const channelsPayload = channelsRes as ChannelsResponse;
+
+      if (!channelsPayload.success) {
+        throw new Error(channelsPayload.error || 'Failed to load channels');
       }
 
       if (!agentsRes.success) {
         throw new Error(agentsRes.error || 'Failed to load agents');
       }
 
-      setChannelGroups(channelsRes.channels || []);
+      setChannelGroups(channelsPayload.channels || []);
       setAgents(agentsRes.agents || []);
+      setGatewayHealth(channelsPayload.gatewayHealth || defaultGatewayHealth);
+      setDiagnosticsSnapshot(null);
+      setShowDiagnostics(false);
       console.info(
-        `[channels-ui] fetch ok probe=${probe ? '1' : '0'} elapsedMs=${Date.now() - startedAt} view=${(channelsRes.channels || []).map((item) => `${item.channelType}:${item.status}`).join(',')}`
+        `[channels-ui] fetch ok probe=${probe ? '1' : '0'} elapsedMs=${Date.now() - startedAt} view=${(channelsPayload.channels || []).map((item) => `${item.channelType}:${item.status}`).join(',')}`
       );
     } catch (fetchError) {
       // Preserve previous data on error — don't clear channelGroups/agents.
@@ -269,6 +331,100 @@ export function Channels() {
     void fetchPageData({ probe: true });
   };
 
+  const fetchDiagnosticsSnapshot = useCallback(async (): Promise<GatewayDiagnosticSnapshot> => {
+    const response = await hostApiFetch<unknown>('/api/diagnostics/gateway-snapshot');
+    if (response && typeof response === 'object') {
+      const payload = response as Record<string, unknown>;
+      if (payload.success === false || typeof payload.error === 'string') {
+        throw new Error(typeof payload.error === 'string' ? payload.error : 'Failed to fetch gateway diagnostics snapshot');
+      }
+    }
+    if (!isGatewayDiagnosticSnapshot(response)) {
+      throw new Error('Invalid gateway diagnostics snapshot response');
+    }
+    const snapshot = response;
+    setDiagnosticsSnapshot(snapshot);
+    return snapshot;
+  }, []);
+
+  const handleRestartGateway = async () => {
+    try {
+      const result = await hostApiFetch<{ success?: boolean; error?: string }>('/api/gateway/restart', {
+        method: 'POST',
+      });
+      if (result?.success !== true) {
+        throw new Error(result?.error || 'Failed to restart gateway');
+      }
+      setDiagnosticsSnapshot(null);
+      setShowDiagnostics(false);
+      toast.success(t('health.restartTriggered'));
+      void fetchPageData({ probe: true });
+    } catch (restartError) {
+      toast.error(t('health.restartFailed', { error: String(restartError) }));
+    }
+  };
+
+  const handleCopyDiagnostics = async () => {
+    setDiagnosticsLoading(true);
+    try {
+      const snapshot = await fetchDiagnosticsSnapshot();
+      await navigator.clipboard.writeText(JSON.stringify(snapshot, null, 2));
+      toast.success(t('health.diagnosticsCopied'));
+    } catch (copyError) {
+      toast.error(t('health.diagnosticsCopyFailed', { error: String(copyError) }));
+    } finally {
+      setDiagnosticsLoading(false);
+    }
+  };
+
+  const handleToggleDiagnostics = async () => {
+    if (showDiagnostics) {
+      setShowDiagnostics(false);
+      return;
+    }
+    setDiagnosticsLoading(true);
+    try {
+      await fetchDiagnosticsSnapshot();
+    } catch (diagnosticsError) {
+      toast.error(t('health.diagnosticsCopyFailed', { error: String(diagnosticsError) }));
+      setDiagnosticsLoading(false);
+      return;
+    } finally {
+      setDiagnosticsLoading(false);
+    }
+    setShowDiagnostics(true);
+  };
+
+  const healthReasonLabel = useMemo(() => {
+    const primaryReason = gatewayHealth.reasons[0];
+    if (!primaryReason) return '';
+    return t(`health.reasons.${primaryReason}`);
+  }, [gatewayHealth.reasons, t]);
+
+  const diagnosticsText = useMemo(
+    () => diagnosticsSnapshot ? JSON.stringify(diagnosticsSnapshot, null, 2) : '',
+    [diagnosticsSnapshot],
+  );
+
+  const statusTone = useCallback((status: ChannelGroupItem['status']) => {
+    switch (status) {
+      case 'connected':
+        return 'bg-green-500/10 text-green-700 dark:text-green-300 border-green-500/20';
+      case 'connecting':
+        return 'bg-sky-500/10 text-sky-700 dark:text-sky-300 border-sky-500/20';
+      case 'degraded':
+        return 'bg-yellow-500/10 text-yellow-700 dark:text-yellow-300 border-yellow-500/20';
+      case 'error':
+        return 'bg-destructive/10 text-destructive border-destructive/20';
+      default:
+        return 'bg-black/5 dark:bg-white/5 text-muted-foreground border-black/10 dark:border-white/10';
+    }
+  }, []);
+
+  const statusLabel = useCallback((status: ChannelGroupItem['status']) => {
+    return t(`account.connectionStatus.${status}`);
+  }, [t]);
+
   const handleBindAgent = async (channelType: string, accountId: string, agentId: string) => {
     try {
       if (!agentId) {
@@ -365,6 +521,86 @@ export function Channels() {
             </div>
           )}
 
+          {gatewayStatus.state === 'running' && gatewayHealth.state !== 'healthy' && (
+            <div
+              data-testid="channels-health-banner"
+              className={cn(
+                'mb-8 rounded-xl border p-4',
+                gatewayHealth.state === 'unresponsive'
+                  ? 'border-destructive/50 bg-destructive/10'
+                  : 'border-yellow-500/50 bg-yellow-500/10',
+              )}
+            >
+              <div className="flex flex-col gap-4 md:flex-row md:items-start md:justify-between">
+                <div className="flex items-start gap-3">
+                  <AlertCircle
+                    className={cn(
+                      'mt-0.5 h-5 w-5 shrink-0',
+                      gatewayHealth.state === 'unresponsive'
+                        ? 'text-destructive'
+                        : 'text-yellow-600 dark:text-yellow-400',
+                    )}
+                  />
+                  <div>
+                    <p className="text-sm font-semibold text-foreground">
+                      {t(`health.state.${gatewayHealth.state}`)}
+                    </p>
+                    {healthReasonLabel && (
+                      <p className="mt-1 text-sm text-foreground/75">{healthReasonLabel}</p>
+                    )}
+                  </div>
+                </div>
+                <div className="flex flex-wrap items-center gap-2">
+                  <Button
+                    data-testid="channels-restart-gateway"
+                    size="sm"
+                    variant="outline"
+                    className="h-8 rounded-full text-xs"
+                    onClick={() => { void handleRestartGateway(); }}
+                  >
+                    <RotateCcw className="mr-2 h-3.5 w-3.5" />
+                    {t('health.restartGateway')}
+                  </Button>
+                  <Button
+                    data-testid="channels-copy-diagnostics"
+                    size="sm"
+                    variant="outline"
+                    className="h-8 rounded-full text-xs"
+                    disabled={diagnosticsLoading}
+                    onClick={() => { void handleCopyDiagnostics(); }}
+                  >
+                    <Copy className="mr-2 h-3.5 w-3.5" />
+                    {t('health.copyDiagnostics')}
+                  </Button>
+                  <Button
+                    data-testid="channels-toggle-diagnostics"
+                    size="sm"
+                    variant="outline"
+                    className="h-8 rounded-full text-xs"
+                    disabled={diagnosticsLoading}
+                    onClick={() => { void handleToggleDiagnostics(); }}
+                  >
+                    {showDiagnostics ? (
+                      <ChevronUp className="mr-2 h-3.5 w-3.5" />
+                    ) : (
+                      <ChevronDown className="mr-2 h-3.5 w-3.5" />
+                    )}
+                    {showDiagnostics ? t('health.hideDiagnostics') : t('health.viewDiagnostics')}
+                  </Button>
+                </div>
+              </div>
+
+              {showDiagnostics && diagnosticsText && (
+                <div className="mt-4 rounded-xl border border-black/10 dark:border-white/10 bg-background/80 p-3">
+                  <p className="mb-2 text-xs font-medium text-muted-foreground">{t('health.diagnosticsTitle')}</p>
+                  <pre data-testid="channels-diagnostics" className="max-h-[320px] overflow-auto whitespace-pre-wrap break-all text-[11px] text-foreground/85">
+                    {diagnosticsText}
+                  </pre>
+                </div>
+              )}
+            </div>
+          )}
+
           {error && (
             <div className="mb-8 p-4 rounded-xl border border-destructive/50 bg-destructive/10 flex items-center gap-3">
               <AlertCircle className="h-5 w-5 text-destructive" />
@@ -393,18 +629,9 @@ export function Channels() {
                           </h3>
                           <p className="text-[12px] text-muted-foreground">{group.channelType}</p>
                         </div>
-                        <div
-                          className={cn(
-                            'w-2 h-2 rounded-full shrink-0',
-                            group.status === 'connected'
-                              ? 'bg-green-500'
-                              : group.status === 'connecting'
-                                ? 'bg-yellow-500 animate-pulse'
-                                : group.status === 'error'
-                                  ? 'bg-destructive'
-                                  : 'bg-muted-foreground'
-                          )}
-                        />
+                        <Badge className={cn('rounded-full border px-2.5 py-0.5 text-[11px] font-medium', statusTone(group.status))}>
+                          {statusLabel(group.status)}
+                        </Badge>
                       </div>
 
                       <div className="flex items-center gap-2">
@@ -456,10 +683,18 @@ export function Channels() {
                             <div className="min-w-0">
                               <div className="flex items-center gap-2">
                                 <p className="text-[13px] font-medium text-foreground truncate">{displayName}</p>
+                                <Badge className={cn('rounded-full border px-2 py-0.5 text-[10px] font-medium', statusTone(account.status))}>
+                                  {statusLabel(account.status)}
+                                </Badge>
                               </div>
                               {account.lastError && (
                                 <div className="text-[12px] text-destructive mt-1">{account.lastError}</div>
                               )}
+                              {!account.lastError && account.statusReason && account.status === 'degraded' && (
+                                <div className="text-[12px] text-yellow-700 dark:text-yellow-300 mt-1">
+                                  {t(`health.reasons.${account.statusReason}`)}
+                                </div>
+                              )}
                             </div>
 
                             <div className="flex items-center gap-2">
diff --git a/src/types/channel.ts b/src/types/channel.ts
index c323c3cac..0fa515494 100644
--- a/src/types/channel.ts
+++ b/src/types/channel.ts
@@ -26,7 +26,7 @@ export type ChannelType =
 /**
  * Channel connection status
  */
-export type ChannelStatus = 'connected' | 'disconnected' | 'connecting' | 'error';
+export type ChannelStatus = 'connected' | 'disconnected' | 'connecting' | 'degraded' | 'error';
 
 /**
  * Channel connection type
diff --git a/tests/e2e/channels-health-diagnostics.spec.ts b/tests/e2e/channels-health-diagnostics.spec.ts
new file mode 100644
index 000000000..94d748dac
--- /dev/null
+++ b/tests/e2e/channels-health-diagnostics.spec.ts
@@ -0,0 +1,167 @@
+import { completeSetup, expect, test } from './fixtures/electron';
+
+test.describe('Channels health diagnostics', () => {
+  test('shows degraded banner, restarts gateway, and copies diagnostics', async ({ electronApp, page }) => {
+    await electronApp.evaluate(({ ipcMain }) => {
+      const state = {
+        restartCount: 0,
+        diagnosticsCount: 0,
+      };
+
+      // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      (globalThis as any).__clawxE2eChannelHealth = state;
+
+      ipcMain.removeHandler('hostapi:fetch');
+      ipcMain.handle('hostapi:fetch', async (_event, request: { path?: string; method?: string }) => {
+        const method = request?.method ?? 'GET';
+        const path = request?.path ?? '';
+        // eslint-disable-next-line @typescript-eslint/no-explicit-any
+        const current = (globalThis as any).__clawxE2eChannelHealth as typeof state;
+
+        if (path === '/api/channels/accounts' && method === 'GET') {
+          return {
+            ok: true,
+            data: {
+              status: 200,
+              ok: true,
+              json: {
+                success: true,
+                gatewayHealth: {
+                  state: 'degraded',
+                  reasons: ['channels_status_timeout'],
+                  consecutiveHeartbeatMisses: 1,
+                },
+                channels: [
+                  {
+                    channelType: 'feishu',
+                    defaultAccountId: 'default',
+                    status: 'degraded',
+                    statusReason: 'channels_status_timeout',
+                    accounts: [
+                      {
+                        accountId: 'default',
+                        name: 'Primary Account',
+                        configured: true,
+                        status: 'degraded',
+                        statusReason: 'channels_status_timeout',
+                        isDefault: true,
+                      },
+                    ],
+                  },
+                ],
+              },
+            },
+          };
+        }
+
+        if (path === '/api/gateway/status' && method === 'GET') {
+          return {
+            ok: true,
+            data: {
+              status: 200,
+              ok: true,
+              json: { state: 'running', port: 18789 },
+            },
+          };
+        }
+
+        if (path === '/api/agents' && method === 'GET') {
+          return {
+            ok: true,
+            data: {
+              status: 200,
+              ok: true,
+              json: { success: true, agents: [] },
+            },
+          };
+        }
+
+        if (path === '/api/gateway/restart' && method === 'POST') {
+          current.restartCount += 1;
+          return {
+            ok: true,
+            data: {
+              status: 200,
+              ok: true,
+              json: { success: true },
+            },
+          };
+        }
+
+        if (path === '/api/diagnostics/gateway-snapshot' && method === 'GET') {
+          current.diagnosticsCount += 1;
+          return {
+            ok: true,
+            data: {
+              status: 200,
+              ok: true,
+              json: {
+                capturedAt: 123,
+                platform: 'darwin',
+                gateway: {
+                  state: 'degraded',
+                  reasons: ['channels_status_timeout'],
+                  consecutiveHeartbeatMisses: 1,
+                },
+                channels: [],
+                clawxLogTail: 'clawx-log',
+                gatewayLogTail: 'gateway-log',
+                gatewayErrLogTail: '',
+              },
+            },
+          };
+        }
+
+        return {
+          ok: false,
+          error: { message: `Unexpected hostapi:fetch request: ${method} ${path}` },
+        };
+      });
+    });
+
+    await completeSetup(page);
+
+    await page.evaluate(() => {
+      Object.defineProperty(navigator, 'clipboard', {
+        value: {
+          writeText: (value: string) => {
+            // eslint-disable-next-line @typescript-eslint/no-explicit-any
+            (window as any).__copiedDiagnostics = value;
+            return Promise.resolve();
+          },
+        },
+        configurable: true,
+      });
+    });
+
+    await page.getByTestId('sidebar-nav-channels').click();
+    await expect(page.getByTestId('channels-page')).toBeVisible();
+    await expect(page.getByTestId('channels-health-banner')).toBeVisible();
+    await expect(page.getByText(/Gateway degraded|网关状态异常|ゲートウェイ劣化/)).toBeVisible();
+    await expect(page.locator('div.rounded-2xl').getByText(/Degraded|异常降级|劣化中/).first()).toBeVisible();
+
+    await page.getByTestId('channels-restart-gateway').click();
+    await page.getByTestId('channels-copy-diagnostics').click();
+    await page.getByTestId('channels-toggle-diagnostics').click();
+
+    await expect(page.getByTestId('channels-diagnostics')).toBeVisible();
+
+    const result = await electronApp.evaluate(() => {
+      // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      const state = (globalThis as any).__clawxE2eChannelHealth as { restartCount: number; diagnosticsCount: number };
+      return {
+        restartCount: state.restartCount,
+        diagnosticsCount: state.diagnosticsCount,
+      };
+    });
+
+    expect(result.restartCount).toBe(1);
+    expect(result.diagnosticsCount).toBeGreaterThanOrEqual(1);
+
+    const copied = await page.evaluate(() => {
+      // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      return (window as any).__copiedDiagnostics as string;
+    });
+    expect(copied).toContain('"platform": "darwin"');
+  });
+});
diff --git a/tests/unit/channel-routes.test.ts b/tests/unit/channel-routes.test.ts
index c43455000..8492c0f5b 100644
--- a/tests/unit/channel-routes.test.ts
+++ b/tests/unit/channel-routes.test.ts
@@ -175,6 +175,7 @@ describe('handleChannelRoutes', () => {
         gatewayManager: {
           rpc,
           getStatus: () => ({ state: 'running' }),
+          getDiagnostics: () => ({ consecutiveHeartbeatMisses: 0, consecutiveRpcFailures: 0 }),
           debouncedReload: vi.fn(),
           debouncedRestart: vi.fn(),
         },
@@ -921,6 +922,145 @@ describe('handleChannelRoutes', () => {
     expect(feishu?.accounts.map((entry) => entry.accountId)).toEqual(['default']);
   });
 
+  it('returns degraded channel health when channels.status times out while gateway is still running', async () => {
+    listConfiguredChannelsMock.mockResolvedValue(['feishu']);
+    listConfiguredChannelAccountsMock.mockResolvedValue({
+      feishu: {
+        defaultAccountId: 'default',
+        accountIds: ['default'],
+      },
+    });
+    readOpenClawConfigMock.mockResolvedValue({
+      channels: {
+        feishu: {
+          defaultAccount: 'default',
+        },
+      },
+    });
+
+    const rpc = vi.fn().mockRejectedValue(new Error('RPC timeout: channels.status'));
+
+    const { handleChannelRoutes } = await import('@electron/api/routes/channels');
+    await handleChannelRoutes(
+      { method: 'GET' } as IncomingMessage,
+      {} as ServerResponse,
+      new URL('http://127.0.0.1:13210/api/channels/accounts'),
+      {
+        gatewayManager: {
+          rpc,
+          getStatus: () => ({ state: 'running' }),
+          getDiagnostics: () => ({ consecutiveHeartbeatMisses: 0, consecutiveRpcFailures: 0 }),
+          debouncedReload: vi.fn(),
+          debouncedRestart: vi.fn(),
+        },
+      } as never,
+    );
+
+    expect(sendJsonMock).toHaveBeenCalledWith(
+      expect.anything(),
+      200,
+      expect.objectContaining({
+        success: true,
+        gatewayHealth: expect.objectContaining({
+          state: 'degraded',
+          reasons: expect.arrayContaining(['channels_status_timeout']),
+        }),
+        channels: [
+          expect.objectContaining({
+            channelType: 'feishu',
+            status: 'degraded',
+            statusReason: 'channels_status_timeout',
+            accounts: [
+              expect.objectContaining({
+                accountId: 'default',
+                status: 'degraded',
+              }),
+            ],
+          }),
+        ],
+      }),
+    );
+  });
+
+  it('keeps channel degraded when only filtered stale runtime accounts carry lastError', async () => {
+    listConfiguredChannelsMock.mockResolvedValue(['feishu']);
+    listConfiguredChannelAccountsMock.mockResolvedValue({
+      feishu: {
+        defaultAccountId: 'default',
+        accountIds: ['default'],
+      },
+    });
+    readOpenClawConfigMock.mockResolvedValue({
+      channels: {
+        feishu: {
+          defaultAccount: 'default',
+        },
+      },
+    });
+
+    const rpc = vi.fn().mockResolvedValue({
+      channels: {
+        feishu: {
+          configured: true,
+        },
+      },
+      channelAccounts: {
+        feishu: [
+          {
+            accountId: 'default',
+            configured: true,
+            connected: true,
+            running: true,
+            linked: false,
+          },
+          {
+            accountId: '2',
+            configured: false,
+            connected: false,
+            running: false,
+            lastError: 'stale runtime session',
+          },
+        ],
+      },
+      channelDefaultAccountId: {
+        feishu: 'default',
+      },
+    });
+
+    const { handleChannelRoutes } = await import('@electron/api/routes/channels');
+    await handleChannelRoutes(
+      { method: 'GET' } as IncomingMessage,
+      {} as ServerResponse,
+      new URL('http://127.0.0.1:13210/api/channels/accounts'),
+      {
+        gatewayManager: {
+          rpc,
+          getStatus: () => ({ state: 'running' }),
+          getDiagnostics: () => ({ consecutiveHeartbeatMisses: 1, consecutiveRpcFailures: 0 }),
+          debouncedReload: vi.fn(),
+          debouncedRestart: vi.fn(),
+        },
+      } as never,
+    );
+
+    expect(sendJsonMock).toHaveBeenCalledWith(
+      expect.anything(),
+      200,
+      expect.objectContaining({
+        success: true,
+        channels: [
+          expect.objectContaining({
+            channelType: 'feishu',
+            status: 'degraded',
+            accounts: [
+              expect.objectContaining({ accountId: 'default', status: 'degraded' }),
+            ],
+          }),
+        ],
+      }),
+    );
+  });
+
   it('lists known QQ Bot targets for a configured account', async () => {
     const knownUsersPath = join(testOpenClawConfigDir, 'qqbot', 'data');
     mkdirSync(knownUsersPath, { recursive: true });
diff --git a/tests/unit/channel-status.test.ts b/tests/unit/channel-status.test.ts
index 3d8db0118..ecd7a4127 100644
--- a/tests/unit/channel-status.test.ts
+++ b/tests/unit/channel-status.test.ts
@@ -63,4 +63,42 @@ describe('channel runtime status helpers', () => {
       ),
     ).toBe('error');
   });
+
+  it('returns degraded when gateway health is degraded', () => {
+    expect(
+      computeChannelRuntimeStatus(
+        { running: true, connected: false, linked: false },
+        { gatewayHealthState: 'degraded' },
+      ),
+    ).toBe('degraded');
+  });
+
+  it('keeps runtime error higher priority than degraded overlay', () => {
+    expect(
+      computeChannelRuntimeStatus(
+        { running: true, lastError: 'bot token invalid' },
+        { gatewayHealthState: 'degraded' },
+      ),
+    ).toBe('error');
+  });
+
+  it('degrades channel summary when gateway health is degraded', () => {
+    expect(
+      pickChannelRuntimeStatus(
+        [{ connected: false, running: false }],
+        undefined,
+        { gatewayHealthState: 'degraded' },
+      ),
+    ).toBe('degraded');
+  });
+
+  it('keeps summary error higher priority than degraded gateway health', () => {
+    expect(
+      pickChannelRuntimeStatus(
+        [{ connected: false, running: false }],
+        { error: 'channel bootstrap failed' },
+        { gatewayHealthState: 'degraded' },
+      ),
+    ).toBe('error');
+  });
 });
diff --git a/tests/unit/channels-page.test.tsx b/tests/unit/channels-page.test.tsx
index 21449f794..638bfbacf 100644
--- a/tests/unit/channels-page.test.tsx
+++ b/tests/unit/channels-page.test.tsx
@@ -51,11 +51,22 @@ function createDeferred<T>() {
 describe('Channels page status refresh', () => {
   beforeEach(() => {
     vi.clearAllMocks();
+    Object.defineProperty(globalThis.navigator, 'clipboard', {
+      value: {
+        writeText: vi.fn(),
+      },
+      configurable: true,
+    });
     gatewayState.status = { state: 'running', port: 18789 };
     hostApiFetchMock.mockImplementation(async (path: string) => {
       if (path === '/api/channels/accounts') {
         return {
           success: true,
+          gatewayHealth: {
+            state: 'healthy',
+            reasons: [],
+            consecutiveHeartbeatMisses: 0,
+          },
           channels: [
             {
               channelType: 'feishu',
@@ -384,4 +395,263 @@ describe('Channels page status refresh', () => {
     expect(appIdInput).toHaveValue('cli_test_app');
     expect(appSecretInput).toHaveValue('secret_test_value');
   });
+
+  it('shows degraded gateway banner and copies diagnostics snapshot', async () => {
+    subscribeHostEventMock.mockImplementation(() => vi.fn());
+    const writeTextMock = vi.mocked(navigator.clipboard.writeText);
+
+    hostApiFetchMock.mockImplementation(async (path: string, init?: { method?: string }) => {
+      if (path === '/api/channels/accounts') {
+        return {
+          success: true,
+          gatewayHealth: {
+            state: 'degraded',
+            reasons: ['channels_status_timeout'],
+            consecutiveHeartbeatMisses: 1,
+          },
+          channels: [
+            {
+              channelType: 'feishu',
+              defaultAccountId: 'default',
+              status: 'degraded',
+              statusReason: 'channels_status_timeout',
+              accounts: [
+                {
+                  accountId: 'default',
+                  name: 'Primary Account',
+                  configured: true,
+                  status: 'degraded',
+                  statusReason: 'channels_status_timeout',
+                  isDefault: true,
+                },
+              ],
+            },
+          ],
+        };
+      }
+
+      if (path === '/api/agents') {
+        return {
+          success: true,
+          agents: [],
+        };
+      }
+
+      if (path === '/api/diagnostics/gateway-snapshot') {
+        return {
+          capturedAt: 123,
+          platform: 'darwin',
+          gateway: {
+            state: 'degraded',
+            reasons: ['channels_status_timeout'],
+            consecutiveHeartbeatMisses: 1,
+          },
+          channels: [],
+          clawxLogTail: 'clawx',
+          gatewayLogTail: 'gateway',
+          gatewayErrLogTail: '',
+        };
+      }
+
+      if (path === '/api/gateway/restart' && init?.method === 'POST') {
+        return { success: true };
+      }
+
+      throw new Error(`Unexpected host API path: ${path}`);
+    });
+
+    render(<Channels />);
+
+    expect(await screen.findByTestId('channels-health-banner')).toBeInTheDocument();
+    expect(screen.getByText('health.state.degraded')).toBeInTheDocument();
+
+    fireEvent.click(screen.getByTestId('channels-copy-diagnostics'));
+
+    await waitFor(() => {
+      expect(hostApiFetchMock).toHaveBeenCalledWith('/api/diagnostics/gateway-snapshot');
+      expect(writeTextMock).toHaveBeenCalledWith(expect.stringContaining('"platform": "darwin"'));
+    });
+  });
+
+  it('surfaces diagnostics fetch failure payloads instead of caching them as snapshots', async () => {
+    subscribeHostEventMock.mockImplementation(() => vi.fn());
+
+    hostApiFetchMock.mockImplementation(async (path: string) => {
+      if (path === '/api/channels/accounts') {
+        return {
+          success: true,
+          gatewayHealth: {
+            state: 'degraded',
+            reasons: ['channels_status_timeout'],
+            consecutiveHeartbeatMisses: 1,
+          },
+          channels: [
+            {
+              channelType: 'feishu',
+              defaultAccountId: 'default',
+              status: 'degraded',
+              statusReason: 'channels_status_timeout',
+              accounts: [
+                {
+                  accountId: 'default',
+                  name: 'Primary Account',
+                  configured: true,
+                  status: 'degraded',
+                  statusReason: 'channels_status_timeout',
+                  isDefault: true,
+                },
+              ],
+            },
+          ],
+        };
+      }
+      if (path === '/api/agents') {
+        return { success: true, agents: [] };
+      }
+      if (path === '/api/diagnostics/gateway-snapshot') {
+        return { success: false, error: 'snapshot failed' };
+      }
+
+      throw new Error(`Unexpected host API path: ${path}`);
+    });
+
+    render(<Channels />);
+    expect(await screen.findByTestId('channels-health-banner')).toBeInTheDocument();
+
+    fireEvent.click(screen.getByTestId('channels-toggle-diagnostics'));
+
+    await waitFor(() => {
+      expect(toastErrorMock).toHaveBeenCalledWith('health.diagnosticsCopyFailed');
+    });
+    expect(screen.queryByTestId('channels-diagnostics')).not.toBeInTheDocument();
+  });
+
+  it('shows restart failure when gateway restart returns success=false', async () => {
+    subscribeHostEventMock.mockImplementation(() => vi.fn());
+
+    hostApiFetchMock.mockImplementation(async (path: string, init?: { method?: string }) => {
+      if (path === '/api/channels/accounts') {
+        return {
+          success: true,
+          gatewayHealth: {
+            state: 'degraded',
+            reasons: ['channels_status_timeout'],
+            consecutiveHeartbeatMisses: 1,
+          },
+          channels: [
+            {
+              channelType: 'feishu',
+              defaultAccountId: 'default',
+              status: 'degraded',
+              statusReason: 'channels_status_timeout',
+              accounts: [
+                {
+                  accountId: 'default',
+                  name: 'Primary Account',
+                  configured: true,
+                  status: 'degraded',
+                  statusReason: 'channels_status_timeout',
+                  isDefault: true,
+                },
+              ],
+            },
+          ],
+        };
+      }
+      if (path === '/api/agents') {
+        return { success: true, agents: [] };
+      }
+      if (path === '/api/gateway/restart' && init?.method === 'POST') {
+        return { success: false, error: 'restart failed' };
+      }
+
+      throw new Error(`Unexpected host API path: ${path}`);
+    });
+
+    render(<Channels />);
+    expect(await screen.findByTestId('channels-health-banner')).toBeInTheDocument();
+
+    fireEvent.click(screen.getByTestId('channels-restart-gateway'));
+
+    await waitFor(() => {
+      expect(toastErrorMock).toHaveBeenCalledWith('health.restartFailed');
+    });
+    expect(toastSuccessMock).not.toHaveBeenCalledWith('health.restartTriggered');
+  });
+
+  it('refetches diagnostics snapshot every time the diagnostics panel is reopened', async () => {
+    subscribeHostEventMock.mockImplementation(() => vi.fn());
+
+    let diagnosticsFetchCount = 0;
+    hostApiFetchMock.mockImplementation(async (path: string) => {
+      if (path === '/api/channels/accounts') {
+        return {
+          success: true,
+          gatewayHealth: {
+            state: 'degraded',
+            reasons: ['channels_status_timeout'],
+            consecutiveHeartbeatMisses: 1,
+          },
+          channels: [
+            {
+              channelType: 'feishu',
+              defaultAccountId: 'default',
+              status: 'degraded',
+              statusReason: 'channels_status_timeout',
+              accounts: [
+                {
+                  accountId: 'default',
+                  name: 'Primary Account',
+                  configured: true,
+                  status: 'degraded',
+                  statusReason: 'channels_status_timeout',
+                  isDefault: true,
+                },
+              ],
+            },
+          ],
+        };
+      }
+      if (path === '/api/agents') {
+        return { success: true, agents: [] };
+      }
+      if (path === '/api/diagnostics/gateway-snapshot') {
+        diagnosticsFetchCount += 1;
+        return {
+          capturedAt: diagnosticsFetchCount,
+          platform: 'darwin',
+          gateway: {
+            state: 'degraded',
+            reasons: ['channels_status_timeout'],
+            consecutiveHeartbeatMisses: 1,
+          },
+          channels: [],
+          clawxLogTail: `clawx-${diagnosticsFetchCount}`,
+          gatewayLogTail: 'gateway',
+          gatewayErrLogTail: '',
+        };
+      }
+
+      throw new Error(`Unexpected host API path: ${path}`);
+    });
+
+    render(<Channels />);
+
+    expect(await screen.findByTestId('channels-health-banner')).toBeInTheDocument();
+
+    fireEvent.click(screen.getByTestId('channels-toggle-diagnostics'));
+    await waitFor(() => {
+      expect(screen.getByTestId('channels-diagnostics')).toHaveTextContent('"capturedAt": 1');
+    });
+
+    fireEvent.click(screen.getByTestId('channels-toggle-diagnostics'));
+    expect(screen.queryByTestId('channels-diagnostics')).not.toBeInTheDocument();
+
+    fireEvent.click(screen.getByTestId('channels-toggle-diagnostics'));
+    await waitFor(() => {
+      expect(screen.getByTestId('channels-diagnostics')).toHaveTextContent('"capturedAt": 2');
+    });
+
+    expect(diagnosticsFetchCount).toBe(2);
+  });
 });
diff --git a/tests/unit/diagnostics-routes.test.ts b/tests/unit/diagnostics-routes.test.ts
new file mode 100644
index 000000000..03638aac3
--- /dev/null
+++ b/tests/unit/diagnostics-routes.test.ts
@@ -0,0 +1,166 @@
+import { afterAll, beforeEach, describe, expect, it, vi } from 'vitest';
+import { mkdirSync, rmSync, writeFileSync } from 'node:fs';
+import { join } from 'node:path';
+import { tmpdir } from 'node:os';
+import type { IncomingMessage, ServerResponse } from 'http';
+
+const buildChannelAccountsViewMock = vi.fn();
+const getChannelStatusDiagnosticsMock = vi.fn();
+const sendJsonMock = vi.fn();
+const readLogFileMock = vi.fn();
+
+const testOpenClawConfigDir = join(tmpdir(), 'clawx-tests', 'diagnostics-routes-openclaw');
+
+vi.mock('@electron/api/routes/channels', () => ({
+  buildChannelAccountsView: (...args: unknown[]) => buildChannelAccountsViewMock(...args),
+  getChannelStatusDiagnostics: (...args: unknown[]) => getChannelStatusDiagnosticsMock(...args),
+}));
+
+vi.mock('@electron/api/route-utils', () => ({
+  sendJson: (...args: unknown[]) => sendJsonMock(...args),
+}));
+
+vi.mock('@electron/utils/logger', () => ({
+  logger: {
+    readLogFile: (...args: unknown[]) => readLogFileMock(...args),
+  },
+}));
+
+vi.mock('@electron/utils/paths', () => ({
+  getOpenClawConfigDir: () => testOpenClawConfigDir,
+}));
+
+describe('handleDiagnosticsRoutes', () => {
+  beforeEach(() => {
+    vi.resetAllMocks();
+    rmSync(testOpenClawConfigDir, { recursive: true, force: true });
+    mkdirSync(join(testOpenClawConfigDir, 'logs'), { recursive: true });
+    buildChannelAccountsViewMock.mockResolvedValue({
+      channels: [
+        {
+          channelType: 'feishu',
+          defaultAccountId: 'default',
+          status: 'degraded',
+          accounts: [
+            {
+              accountId: 'default',
+              name: 'Primary Account',
+              configured: true,
+              status: 'degraded',
+              statusReason: 'channels_status_timeout',
+              isDefault: true,
+            },
+          ],
+        },
+      ],
+      gatewayHealth: {
+        state: 'degraded',
+        reasons: ['channels_status_timeout'],
+        consecutiveHeartbeatMisses: 1,
+      },
+    });
+    getChannelStatusDiagnosticsMock.mockReturnValue({
+      lastChannelsStatusOkAt: 100,
+      lastChannelsStatusFailureAt: 200,
+    });
+    readLogFileMock.mockResolvedValue('clawx-log-tail');
+  });
+
+  afterAll(() => {
+    rmSync(testOpenClawConfigDir, { recursive: true, force: true });
+  });
+
+  it('returns diagnostics snapshot with channel view and tailed logs', async () => {
+    writeFileSync(join(testOpenClawConfigDir, 'logs', 'gateway.log'), 'gateway-line-1\ngateway-line-2\n');
+
+    const { handleDiagnosticsRoutes } = await import('@electron/api/routes/diagnostics');
+    const handled = await handleDiagnosticsRoutes(
+      { method: 'GET' } as IncomingMessage,
+      {} as ServerResponse,
+      new URL('http://127.0.0.1:13210/api/diagnostics/gateway-snapshot'),
+      {
+        gatewayManager: {
+          getStatus: () => ({ state: 'running', port: 18789, connectedAt: 50 }),
+          getDiagnostics: () => ({
+            lastAliveAt: 60,
+            lastRpcSuccessAt: 70,
+            consecutiveHeartbeatMisses: 1,
+            consecutiveRpcFailures: 0,
+          }),
+        },
+      } as never,
+    );
+
+    expect(handled).toBe(true);
+    const payload = sendJsonMock.mock.calls.at(-1)?.[2] as {
+      platform?: string;
+      channels?: Array<{ channelType: string; status: string }>;
+      clawxLogTail?: string;
+      gatewayLogTail?: string;
+      gatewayErrLogTail?: string;
+      gateway?: { state?: string; reasons?: string[] };
+    };
+    expect(payload.platform).toBe(process.platform);
+    expect(payload.channels).toEqual([
+      expect.objectContaining({
+        channelType: 'feishu',
+        status: 'degraded',
+      }),
+    ]);
+    expect(payload.clawxLogTail).toBe('clawx-log-tail');
+    expect(payload.gatewayLogTail).toContain('gateway-line-1');
+    expect(payload.gatewayErrLogTail).toBe('');
+    expect(payload.gateway?.state).toBe('degraded');
+    expect(payload.gateway?.reasons).toEqual(expect.arrayContaining(['gateway_degraded']));
+  });
+
+  it('returns empty gateway log tails when log files are missing', async () => {
+    const { handleDiagnosticsRoutes } = await import('@electron/api/routes/diagnostics');
+    await handleDiagnosticsRoutes(
+      { method: 'GET' } as IncomingMessage,
+      {} as ServerResponse,
+      new URL('http://127.0.0.1:13210/api/diagnostics/gateway-snapshot'),
+      {
+        gatewayManager: {
+          getStatus: () => ({ state: 'running', port: 18789 }),
+          getDiagnostics: () => ({
+            consecutiveHeartbeatMisses: 0,
+            consecutiveRpcFailures: 0,
+          }),
+        },
+      } as never,
+    );
+
+    const payload = sendJsonMock.mock.calls.at(-1)?.[2] as {
+      gatewayLogTail?: string;
+      gatewayErrLogTail?: string;
+    };
+    expect(payload.gatewayLogTail).toBe('');
+    expect(payload.gatewayErrLogTail).toBe('');
+  });
+
+  it('reads tailed logs without leaking unread buffer bytes', async () => {
+    writeFileSync(join(testOpenClawConfigDir, 'logs', 'gateway.log'), 'only-one-line');
+
+    const { handleDiagnosticsRoutes } = await import('@electron/api/routes/diagnostics');
+    await handleDiagnosticsRoutes(
+      { method: 'GET' } as IncomingMessage,
+      {} as ServerResponse,
+      new URL('http://127.0.0.1:13210/api/diagnostics/gateway-snapshot'),
+      {
+        gatewayManager: {
+          getStatus: () => ({ state: 'running', port: 18789 }),
+          getDiagnostics: () => ({
+            consecutiveHeartbeatMisses: 0,
+            consecutiveRpcFailures: 0,
+          }),
+        },
+      } as never,
+    );
+
+    const payload = sendJsonMock.mock.calls.at(-1)?.[2] as {
+      gatewayLogTail?: string;
+    };
+    expect(payload.gatewayLogTail).toBe('only-one-line');
+  });
+});
diff --git a/tests/unit/gateway-manager-diagnostics.test.ts b/tests/unit/gateway-manager-diagnostics.test.ts
new file mode 100644
index 000000000..c62efba38
--- /dev/null
+++ b/tests/unit/gateway-manager-diagnostics.test.ts
@@ -0,0 +1,165 @@
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+
+vi.mock('electron', () => ({
+  app: {
+    getPath: () => '/tmp',
+    isPackaged: false,
+  },
+  utilityProcess: {
+    fork: vi.fn(),
+  },
+}));
+
+vi.mock('@electron/utils/logger', () => ({
+  logger: {
+    info: vi.fn(),
+    warn: vi.fn(),
+    error: vi.fn(),
+    debug: vi.fn(),
+  },
+}));
+
+describe('GatewayManager diagnostics', () => {
+  const originalPlatform = process.platform;
+
+  beforeEach(() => {
+    vi.resetModules();
+    vi.clearAllMocks();
+    vi.useFakeTimers();
+    vi.setSystemTime(new Date('2026-04-14T00:00:00.000Z'));
+    Object.defineProperty(process, 'platform', { value: originalPlatform });
+  });
+
+  afterEach(() => {
+    vi.useRealTimers();
+    Object.defineProperty(process, 'platform', { value: originalPlatform });
+  });
+
+  it('updates diagnostics on gateway message, rpc success/timeout, and socket close', async () => {
+    const { GatewayManager } = await import('@electron/gateway/manager');
+    const manager = new GatewayManager();
+
+    const ws = {
+      readyState: 1,
+      send: vi.fn(),
+      ping: vi.fn(),
+      terminate: vi.fn(),
+      on: vi.fn(),
+    };
+
+    (manager as unknown as { ws: typeof ws }).ws = ws;
+
+    (manager as unknown as { handleMessage: (message: unknown) => void }).handleMessage({
+      type: 'event',
+      event: 'gateway.ready',
+      payload: {},
+    });
+    expect(manager.getDiagnostics().lastAliveAt).toBe(Date.now());
+
+    const successPromise = manager.rpc<{ ok: boolean }>('chat.history', {}, 1000);
+    const successRequestId = Array.from(
+      (manager as unknown as { pendingRequests: Map<string, unknown> }).pendingRequests.keys(),
+    )[0];
+    (manager as unknown as { handleMessage: (message: unknown) => void }).handleMessage({
+      type: 'res',
+      id: successRequestId,
+      ok: true,
+      payload: { ok: true },
+    });
+    await expect(successPromise).resolves.toEqual({ ok: true });
+    expect(manager.getDiagnostics().lastRpcSuccessAt).toBe(Date.now());
+    expect(manager.getDiagnostics().consecutiveRpcFailures).toBe(0);
+
+    const failurePromise = manager.rpc('chat.history', {}, 1000);
+    vi.advanceTimersByTime(1001);
+    await expect(failurePromise).rejects.toThrow('RPC timeout: chat.history');
+
+    const diagnostics = manager.getDiagnostics();
+    expect(diagnostics.lastRpcFailureAt).toBe(Date.now());
+    expect(diagnostics.lastRpcFailureMethod).toBe('chat.history');
+    expect(diagnostics.consecutiveRpcFailures).toBe(1);
+
+    (manager as unknown as { recordSocketClose: (code: number) => void }).recordSocketClose(1006);
+    expect(manager.getDiagnostics().lastSocketCloseAt).toBe(Date.now());
+    expect(manager.getDiagnostics().lastSocketCloseCode).toBe(1006);
+  });
+
+  it('does not count gateway-declared rpc errors as transport failures', async () => {
+    const { GatewayManager } = await import('@electron/gateway/manager');
+    const { buildGatewayHealthSummary } = await import('@electron/utils/gateway-health');
+    const manager = new GatewayManager();
+
+    const ws = {
+      readyState: 1,
+      send: vi.fn(),
+      ping: vi.fn(),
+      terminate: vi.fn(),
+      on: vi.fn(),
+    };
+
+    (manager as unknown as { ws: typeof ws }).ws = ws;
+    (manager as unknown as { status: { state: string; port: number } }).status = {
+      state: 'running',
+      port: 18789,
+    };
+
+    const failurePromise = manager.rpc('channels.status', {}, 1000);
+    const failureRequestId = Array.from(
+      (manager as unknown as { pendingRequests: Map<string, unknown> }).pendingRequests.keys(),
+    )[0];
+    (manager as unknown as { handleMessage: (message: unknown) => void }).handleMessage({
+      type: 'res',
+      id: failureRequestId,
+      ok: false,
+      error: { message: 'channel unavailable' },
+    });
+    await expect(failurePromise).rejects.toThrow('channel unavailable');
+
+    expect(manager.getDiagnostics().consecutiveRpcFailures).toBe(0);
+
+    const health = buildGatewayHealthSummary({
+      status: manager.getStatus(),
+      diagnostics: manager.getDiagnostics(),
+      platform: process.platform,
+    });
+    expect(health.reasons).not.toContain('rpc_timeout');
+  });
+
+  it('keeps windows heartbeat recovery disabled while diagnostics degrade', async () => {
+    Object.defineProperty(process, 'platform', { value: 'win32' });
+
+    const { GatewayManager } = await import('@electron/gateway/manager');
+    const { buildGatewayHealthSummary } = await import('@electron/utils/gateway-health');
+    const manager = new GatewayManager();
+
+    const ws = {
+      readyState: 1,
+      send: vi.fn(),
+      ping: vi.fn(),
+      terminate: vi.fn(),
+      on: vi.fn(),
+    };
+
+    (manager as unknown as { ws: typeof ws }).ws = ws;
+    (manager as unknown as { shouldReconnect: boolean }).shouldReconnect = true;
+    (manager as unknown as { status: { state: string; port: number } }).status = {
+      state: 'running',
+      port: 18789,
+    };
+    const restartSpy = vi.spyOn(manager, 'restart').mockResolvedValue();
+
+    (manager as unknown as { startPing: () => void }).startPing();
+    vi.advanceTimersByTime(400_000);
+
+    expect(restartSpy).not.toHaveBeenCalled();
+
+    const health = buildGatewayHealthSummary({
+      status: manager.getStatus(),
+      diagnostics: manager.getDiagnostics(),
+      platform: 'win32',
+    });
+    expect(health.state).not.toBe('healthy');
+
+    (manager as unknown as { connectionMonitor: { clear: () => void } }).connectionMonitor.clear();
+  });
+});
diff --git a/tests/unit/gateway-manager-heartbeat.test.ts b/tests/unit/gateway-manager-heartbeat.test.ts
index d1d834474..5c901486e 100644
--- a/tests/unit/gateway-manager-heartbeat.test.ts
+++ b/tests/unit/gateway-manager-heartbeat.test.ts
@@ -11,12 +11,22 @@ vi.mock('electron', () => ({
 }));
 
 describe('GatewayManager heartbeat recovery', () => {
+  const originalPlatform = process.platform;
+
   beforeEach(() => {
+    vi.resetModules();
+    vi.clearAllMocks();
     vi.useFakeTimers();
     vi.setSystemTime(new Date('2026-03-19T00:00:00.000Z'));
+    Object.defineProperty(process, 'platform', { value: originalPlatform });
   });
 
-  it('logs warning but does NOT terminate socket after consecutive heartbeat misses', async () => {
+  afterEach(() => {
+    vi.useRealTimers();
+    Object.defineProperty(process, 'platform', { value: originalPlatform });
+  });
+
+  it('restarts after consecutive heartbeat misses reach threshold', async () => {
     const { GatewayManager } = await import('@electron/gateway/manager');
     const manager = new GatewayManager();
 
@@ -33,20 +43,20 @@ describe('GatewayManager heartbeat recovery', () => {
       state: 'running',
       port: 18789,
     };
+    const restartSpy = vi.spyOn(manager, 'restart').mockResolvedValue();
 
     (manager as unknown as { startPing: () => void }).startPing();
 
     vi.advanceTimersByTime(120_000);
 
     expect(ws.ping).toHaveBeenCalledTimes(3);
-    // Heartbeat timeout is now observability-only — socket should NOT be terminated.
-    // Process liveness is detected via child.on('exit'), socket disconnects via ws.on('close').
     expect(ws.terminate).not.toHaveBeenCalled();
+    expect(restartSpy).toHaveBeenCalledTimes(1);
 
     (manager as unknown as { connectionMonitor: { clear: () => void } }).connectionMonitor.clear();
   });
 
-  it('does not terminate when heartbeat is recovered by incoming messages', async () => {
+  it('does not restart when heartbeat is recovered by incoming messages', async () => {
     const { GatewayManager } = await import('@electron/gateway/manager');
     const manager = new GatewayManager();
 
@@ -63,6 +73,7 @@ describe('GatewayManager heartbeat recovery', () => {
       state: 'running',
       port: 18789,
     };
+    const restartSpy = vi.spyOn(manager, 'restart').mockResolvedValue();
 
     (manager as unknown as { startPing: () => void }).startPing();
 
@@ -75,6 +86,65 @@ describe('GatewayManager heartbeat recovery', () => {
     vi.advanceTimersByTime(30_000); // miss #2 + ping #5
 
     expect(ws.terminate).not.toHaveBeenCalled();
+    expect(restartSpy).not.toHaveBeenCalled();
+
+    (manager as unknown as { connectionMonitor: { clear: () => void } }).connectionMonitor.clear();
+  });
+
+  it('skips heartbeat recovery when auto-reconnect is disabled', async () => {
+    const { GatewayManager } = await import('@electron/gateway/manager');
+    const manager = new GatewayManager();
+
+    const ws = {
+      readyState: 1,
+      ping: vi.fn(),
+      terminate: vi.fn(),
+      on: vi.fn(),
+    };
+
+    (manager as unknown as { ws: typeof ws }).ws = ws;
+    (manager as unknown as { shouldReconnect: boolean }).shouldReconnect = false;
+    (manager as unknown as { status: { state: string; port: number } }).status = {
+      state: 'running',
+      port: 18789,
+    };
+    const restartSpy = vi.spyOn(manager, 'restart').mockResolvedValue();
+
+    (manager as unknown as { startPing: () => void }).startPing();
+
+    vi.advanceTimersByTime(120_000);
+
+    expect(restartSpy).not.toHaveBeenCalled();
+
+    (manager as unknown as { connectionMonitor: { clear: () => void } }).connectionMonitor.clear();
+  });
+
+  it('keeps heartbeat recovery disabled on windows', async () => {
+    Object.defineProperty(process, 'platform', { value: 'win32' });
+
+    const { GatewayManager } = await import('@electron/gateway/manager');
+    const manager = new GatewayManager();
+
+    const ws = {
+      readyState: 1,
+      ping: vi.fn(),
+      terminate: vi.fn(),
+      on: vi.fn(),
+    };
+
+    (manager as unknown as { ws: typeof ws }).ws = ws;
+    (manager as unknown as { shouldReconnect: boolean }).shouldReconnect = true;
+    (manager as unknown as { status: { state: string; port: number } }).status = {
+      state: 'running',
+      port: 18789,
+    };
+    const restartSpy = vi.spyOn(manager, 'restart').mockResolvedValue();
+
+    (manager as unknown as { startPing: () => void }).startPing();
+
+    vi.advanceTimersByTime(400_000);
+
+    expect(restartSpy).not.toHaveBeenCalled();
 
     (manager as unknown as { connectionMonitor: { clear: () => void } }).connectionMonitor.clear();
   });
diff --git a/tests/unit/sanitize-config.test.ts b/tests/unit/sanitize-config.test.ts
index 4aab34346..aab4bace3 100644
--- a/tests/unit/sanitize-config.test.ts
+++ b/tests/unit/sanitize-config.test.ts
@@ -128,6 +128,56 @@ async function sanitizeConfig(
         : {}
     ) as Record<string, unknown>;
 
+    const acpxEntry = (entries.acpx && typeof entries.acpx === 'object' && !Array.isArray(entries.acpx))
+      ? { ...(entries.acpx as Record<string, unknown>) }
+      : null;
+    const acpxConfig = (acpxEntry?.config && typeof acpxEntry.config === 'object' && !Array.isArray(acpxEntry.config))
+      ? { ...(acpxEntry.config as Record<string, unknown>) }
+      : null;
+    if (acpxConfig) {
+      for (const legacyKey of ['command', 'expectedVersion'] as const) {
+        if (legacyKey in acpxConfig) {
+          delete acpxConfig[legacyKey];
+          modified = true;
+        }
+      }
+      acpxEntry!.config = acpxConfig;
+      entries.acpx = acpxEntry!;
+      pluginsObj.entries = entries;
+    }
+
+    const installs = (
+      pluginsObj.installs && typeof pluginsObj.installs === 'object' && !Array.isArray(pluginsObj.installs)
+        ? { ...(pluginsObj.installs as Record<string, unknown>) }
+        : {}
+    ) as Record<string, unknown>;
+    const acpxInstall = (installs.acpx && typeof installs.acpx === 'object' && !Array.isArray(installs.acpx))
+      ? installs.acpx as Record<string, unknown>
+      : null;
+    if (acpxInstall) {
+      const currentBundledAcpxDir = join(tempDir, 'node_modules', 'openclaw', 'dist', 'extensions', 'acpx').replace(/\\/g, '/');
+      const sourcePath = typeof acpxInstall.sourcePath === 'string' ? acpxInstall.sourcePath : '';
+      const installPath = typeof acpxInstall.installPath === 'string' ? acpxInstall.installPath : '';
+      const normalizedSourcePath = sourcePath.replace(/\\/g, '/');
+      const normalizedInstallPath = installPath.replace(/\\/g, '/');
+      const pointsAtDifferentBundledTree = [normalizedSourcePath, normalizedInstallPath].some(
+        (candidate) => candidate.includes('/node_modules/.pnpm/openclaw@') && candidate !== currentBundledAcpxDir,
+      );
+      const pointsAtMissingPath = (sourcePath && !(await fileExists(sourcePath)))
+        || (installPath && !(await fileExists(installPath)));
+
+      if (pointsAtDifferentBundledTree || pointsAtMissingPath) {
+        delete installs.acpx;
+        modified = true;
+      }
+
+      if (Object.keys(installs).length > 0) {
+        pluginsObj.installs = installs;
+      } else {
+        delete pluginsObj.installs;
+      }
+    }
+
     if ('whatsapp' in entries) {
       delete entries.whatsapp;
       pluginsObj.entries = entries;
@@ -625,6 +675,49 @@ describe('sanitizeOpenClawConfig (blocklist approach)', () => {
     expect(load.paths).toEqual(['relative/plugin-path', './another-relative']);
   });
 
+  it('removes legacy acpx overrides and stale bundled install metadata', async () => {
+    await writeConfig({
+      plugins: {
+        entries: {
+          acpx: {
+            enabled: true,
+            config: {
+              permissionMode: 'approve-all',
+              nonInteractivePermissions: 'fail',
+              command: '/Users/example/project/node_modules/.pnpm/openclaw@2026.4.1/node_modules/openclaw/dist/extensions/acpx/node_modules/acpx/dist/cli.js',
+              expectedVersion: 'any',
+              pluginToolsMcpBridge: true,
+            },
+          },
+        },
+        installs: {
+          acpx: {
+            source: 'path',
+            spec: 'acpx',
+            sourcePath: '/Users/example/project/node_modules/.pnpm/openclaw@2026.4.1/node_modules/openclaw/dist/extensions/acpx',
+            installPath: '/Users/example/project/node_modules/.pnpm/openclaw@2026.4.1/node_modules/openclaw/dist/extensions/acpx',
+          },
+        },
+      },
+    });
+
+    const modified = await sanitizeConfig(configPath);
+    expect(modified).toBe(true);
+
+    const result = await readConfig();
+    const plugins = result.plugins as Record<string, unknown>;
+    const entries = plugins.entries as Record<string, unknown>;
+    const acpx = entries.acpx as Record<string, unknown>;
+    const acpxConfig = acpx.config as Record<string, unknown>;
+
+    expect(acpxConfig).toEqual({
+      permissionMode: 'approve-all',
+      nonInteractivePermissions: 'fail',
+      pluginToolsMcpBridge: true,
+    });
+    expect(plugins).not.toHaveProperty('installs');
+  });
+
   it('does nothing when plugins.load.paths contains only valid paths', async () => {
     const original = {
       plugins: {