diff --git a/android/app/src/main/java/com/hyzq/boss/AiAccountsActivity.java b/android/app/src/main/java/com/hyzq/boss/AiAccountsActivity.java
index 6fe2d07..95ab4f0 100644
--- a/android/app/src/main/java/com/hyzq/boss/AiAccountsActivity.java
+++ b/android/app/src/main/java/com/hyzq/boss/AiAccountsActivity.java
@@ -33,6 +33,7 @@ public class AiAccountsActivity extends BossScreenActivity {
     private static final String PROVIDER_CHATGPT_OAUTH = "chatgpt_oauth";
     private static final String PROVIDER_OPENAI_API = "openai_api";
     private static final String PROVIDER_ALIYUN_QWEN_API = "aliyun_qwen_api";
+    private static final String PROVIDER_DEEPSEEK_API = "deepseek_api";
     private static final String PROVIDER_MINIMAX_API = "minimax_api";
     private static final String PROVIDER_GLM_API = "glm_api";
     private static final String PROVIDER_HYZQ_API = "hyzq_api";
@@ -41,6 +42,7 @@ public class AiAccountsActivity extends BossScreenActivity {
     private static final String DEFAULT_MASTER_MODEL = "gpt-5.4";
     private static final String OPENAI_API_BASE_URL = "https://api.openai.com/v1";
     private static final String ALIYUN_QWEN_API_BASE_URL = "https://dashscope.aliyuncs.com/compatible-mode/v1";
+    private static final String DEEPSEEK_API_BASE_URL = "https://api.deepseek.com";
     private static final String MINIMAX_API_BASE_URL = "https://api.minimaxi.com/v1";
     private static final String GLM_API_BASE_URL = "https://open.bigmodel.cn/api/paas/v4";
     private static final String HYZQ_API_BASE_URL = "https://api.hyzq2046.com/v1";
@@ -54,6 +56,7 @@ public class AiAccountsActivity extends BossScreenActivity {
 
     private static final ProviderOption[] API_OPTIONS = new ProviderOption[] {
             new ProviderOption(PROVIDER_ALIYUN_QWEN_API, "阿里", "阿里百炼 API", "自动填好百炼兼容地址，直接填写模型和 Key。"),
+            new ProviderOption(PROVIDER_DEEPSEEK_API, "DeepSeek", "DeepSeek API", "自动填好 DeepSeek 地址，可选择 V4 Pro / Flash。"),
             new ProviderOption(PROVIDER_MINIMAX_API, "Minimax", "MiniMax API", "自动填好 MiniMax 地址，适合接成主链路或备用链路。"),
             new ProviderOption(PROVIDER_GLM_API, "GLM", "智谱 GLM API", "自动填好 GLM 地址，直接复用通用 API 保存流程。"),
             new ProviderOption(PROVIDER_HYZQ_API, "环宇智擎", "环宇智擎 API", "自动填好环宇智擎网关地址，直接填写模型和 Key。"),
@@ -466,7 +469,7 @@ public class AiAccountsActivity extends BossScreenActivity {
                 isPrimaryRole(targetRole)
                         ? "主链路可直接接兼容 API。"
                         : "备用链路可接兼容 API 做兜底。",
-                "支持阿里、Minimax、GLM、环宇智擎和自定义。",
+                "支持阿里、DeepSeek、Minimax、GLM、环宇智擎和自定义。",
                 null,
                 null
         ));
@@ -575,6 +578,7 @@ public class AiAccountsActivity extends BossScreenActivity {
     private boolean isApiProvider(String provider) {
         return PROVIDER_OPENAI_API.equals(provider)
                 || PROVIDER_ALIYUN_QWEN_API.equals(provider)
+                || PROVIDER_DEEPSEEK_API.equals(provider)
                 || PROVIDER_MINIMAX_API.equals(provider)
                 || PROVIDER_GLM_API.equals(provider)
                 || PROVIDER_HYZQ_API.equals(provider)
@@ -588,6 +592,9 @@ public class AiAccountsActivity extends BossScreenActivity {
         if (PROVIDER_ALIYUN_QWEN_API.equals(provider)) {
             return ALIYUN_QWEN_API_BASE_URL;
         }
+        if (PROVIDER_DEEPSEEK_API.equals(provider)) {
+            return DEEPSEEK_API_BASE_URL;
+        }
         if (PROVIDER_MINIMAX_API.equals(provider)) {
             return MINIMAX_API_BASE_URL;
         }
@@ -604,6 +611,9 @@ public class AiAccountsActivity extends BossScreenActivity {
         if (PROVIDER_ALIYUN_QWEN_API.equals(provider)) {
             return "qwen3.5-plus";
         }
+        if (PROVIDER_DEEPSEEK_API.equals(provider)) {
+            return "deepseek-v4-pro";
+        }
         if (PROVIDER_MINIMAX_API.equals(provider)) {
             return "MiniMax-M1";
         }
@@ -629,6 +639,9 @@ public class AiAccountsActivity extends BossScreenActivity {
         if (PROVIDER_ALIYUN_QWEN_API.equals(provider)) {
             return "阿里";
         }
+        if (PROVIDER_DEEPSEEK_API.equals(provider)) {
+            return "DeepSeek";
+        }
         if (PROVIDER_MINIMAX_API.equals(provider)) {
             return "Minimax";
         }
diff --git a/scripts/deploy-server.sh b/scripts/deploy-server.sh
index c6975ff..e88445a 100755
--- a/scripts/deploy-server.sh
+++ b/scripts/deploy-server.sh
@@ -6,7 +6,7 @@ REMOTE_USER="${BOSS_SERVER_USER:-ubuntu}"
 REMOTE_HOSTNAME="${BOSS_SERVER_HOST:-106.53.170.158}"
 REMOTE_HOST="${BOSS_REMOTE_HOST:-${REMOTE_USER}@${REMOTE_HOSTNAME}}"
 REMOTE_DIR="${BOSS_REMOTE_DIR:-/opt/boss}"
-SSH_OPTS="-o StrictHostKeyChecking=no"
+SSH_OPTS="-o StrictHostKeyChecking=no -o PreferredAuthentications=password -o PubkeyAuthentication=no -o NumberOfPasswordPrompts=1"
 KEYCHAIN_SERVICE="${BOSS_KEYCHAIN_SERVICE:-boss-server-debug-ssh}"
 BUILD_MODE="${BOSS_DEPLOY_BUILD_MODE:-auto}"
 
diff --git a/src/app/api/v1/accounts/[accountId]/route.ts b/src/app/api/v1/accounts/[accountId]/route.ts
index 1eec0c5..7a3fbef 100644
--- a/src/app/api/v1/accounts/[accountId]/route.ts
+++ b/src/app/api/v1/accounts/[accountId]/route.ts
@@ -15,6 +15,7 @@ function isValidProvider(
   | "chatgpt_oauth"
   | "openai_api"
   | "aliyun_qwen_api"
+  | "deepseek_api"
   | "minimax_api"
   | "glm_api"
   | "hyzq_api"
@@ -25,6 +26,7 @@ function isValidProvider(
     value === "chatgpt_oauth" ||
     value === "openai_api" ||
     value === "aliyun_qwen_api" ||
+    value === "deepseek_api" ||
     value === "minimax_api" ||
     value === "glm_api" ||
     value === "hyzq_api" ||
diff --git a/src/app/api/v1/accounts/route.ts b/src/app/api/v1/accounts/route.ts
index 5bb6f2b..8c9e058 100644
--- a/src/app/api/v1/accounts/route.ts
+++ b/src/app/api/v1/accounts/route.ts
@@ -15,6 +15,7 @@ function isValidProvider(
   | "chatgpt_oauth"
   | "openai_api"
   | "aliyun_qwen_api"
+  | "deepseek_api"
   | "minimax_api"
   | "glm_api"
   | "hyzq_api"
@@ -25,6 +26,7 @@ function isValidProvider(
     value === "chatgpt_oauth" ||
     value === "openai_api" ||
     value === "aliyun_qwen_api" ||
+    value === "deepseek_api" ||
     value === "minimax_api" ||
     value === "glm_api" ||
     value === "hyzq_api" ||
diff --git a/src/app/api/v1/accounts/validate-draft/route.ts b/src/app/api/v1/accounts/validate-draft/route.ts
index 83ef7ae..1793936 100644
--- a/src/app/api/v1/accounts/validate-draft/route.ts
+++ b/src/app/api/v1/accounts/validate-draft/route.ts
@@ -7,6 +7,7 @@ function isValidProvider(
 ): value is
   | "openai_api"
   | "aliyun_qwen_api"
+  | "deepseek_api"
   | "minimax_api"
   | "glm_api"
   | "hyzq_api"
@@ -14,6 +15,7 @@ function isValidProvider(
   return (
     value === "openai_api" ||
     value === "aliyun_qwen_api" ||
+    value === "deepseek_api" ||
     value === "minimax_api" ||
     value === "glm_api" ||
     value === "hyzq_api" ||
diff --git a/src/components/ai-accounts-client.tsx b/src/components/ai-accounts-client.tsx
index a3148c7..f6e2b4f 100644
--- a/src/components/ai-accounts-client.tsx
+++ b/src/components/ai-accounts-client.tsx
@@ -71,10 +71,27 @@ function providerOptions() {
   return [
     { value: "openai_api", label: "OpenAI API" },
     { value: "aliyun_qwen_api", label: "阿里百炼 Qwen" },
+    { value: "deepseek_api", label: "DeepSeek API" },
+    { value: "minimax_api", label: "MiniMax API" },
+    { value: "glm_api", label: "GLM API" },
+    { value: "hyzq_api", label: "环宇智擎 API" },
+    { value: "custom_api", label: "自定义 API" },
     { value: "master_codex_node", label: "Master Codex Node / ChatGPT Plus 节点" },
   ] as const;
 }
 
+function isApiKeyDraftProvider(provider: AiProvider) {
+  return (
+    provider === "openai_api" ||
+    provider === "aliyun_qwen_api" ||
+    provider === "deepseek_api" ||
+    provider === "minimax_api" ||
+    provider === "glm_api" ||
+    provider === "hyzq_api" ||
+    provider === "custom_api"
+  );
+}
+
 function defaultOpenAiOnboardDraft(): OpenAiOnboardDraft {
   return {
     label: "主 GPT",
@@ -675,7 +692,7 @@ export function AiAccountsClient({
                   placeholder="例如：gpt-5.4"
                 />
               )}
-              {draft.provider === "openai_api" || draft.provider === "aliyun_qwen_api" ? (
+              {isApiKeyDraftProvider(draft.provider) ? (
                 <div className="col-span-2">
                   <AccountField
                     label={`API Key${account.apiKeyMasked ? `（已配置 ${account.apiKeyMasked}）` : ""}`}
@@ -688,7 +705,9 @@ export function AiAccountsClient({
                         ? "留空则保持现有 Key"
                         : draft.provider === "aliyun_qwen_api"
                           ? "输入阿里百炼 API Key"
-                          : "输入 OpenAI API Key"
+                          : draft.provider === "deepseek_api"
+                            ? "输入 DeepSeek API Key"
+                            : "输入 API Key"
                     }
                     type="password"
                   />
diff --git a/src/lib/boss-data.ts b/src/lib/boss-data.ts
index 6468dfd..1e04510 100644
--- a/src/lib/boss-data.ts
+++ b/src/lib/boss-data.ts
@@ -226,6 +226,7 @@ export type AiProvider =
   | "chatgpt_oauth"
   | "openai_api"
   | "aliyun_qwen_api"
+  | "deepseek_api"
   | "minimax_api"
   | "glm_api"
   | "hyzq_api"
@@ -3354,6 +3355,8 @@ export function aiProviderLabel(provider: AiProvider) {
       return "OpenAI API";
     case "aliyun_qwen_api":
       return "阿里百炼 Qwen";
+    case "deepseek_api":
+      return "DeepSeek API";
     case "minimax_api":
       return "MiniMax API";
     case "glm_api":
@@ -3373,6 +3376,8 @@ export function aiProviderDefaultApiBaseUrl(provider: AiProvider) {
       return "https://api.openai.com/v1";
     case "aliyun_qwen_api":
       return "https://dashscope.aliyuncs.com/compatible-mode/v1";
+    case "deepseek_api":
+      return "https://api.deepseek.com";
     case "minimax_api":
       return "https://api.minimaxi.com/v1";
     case "glm_api":
@@ -3390,6 +3395,8 @@ export function aiProviderDefaultModel(provider: AiProvider) {
       return "gpt-5.4";
     case "aliyun_qwen_api":
       return "qwen3.5-plus";
+    case "deepseek_api":
+      return "deepseek-v4-pro";
     case "minimax_api":
       return "MiniMax-M1";
     case "glm_api":
@@ -3434,6 +3441,7 @@ export function isApiKeyProvider(provider: AiProvider) {
   return (
     provider === "openai_api" ||
     provider === "aliyun_qwen_api" ||
+    provider === "deepseek_api" ||
     provider === "minimax_api" ||
     provider === "glm_api" ||
     provider === "hyzq_api" ||
diff --git a/src/lib/boss-master-agent.ts b/src/lib/boss-master-agent.ts
index 0387da0..b1e3598 100644
--- a/src/lib/boss-master-agent.ts
+++ b/src/lib/boss-master-agent.ts
@@ -1,7 +1,6 @@
 import { randomBytes } from "node:crypto";
 import {
   AUTH_SESSION_TTL_MS,
-  aiRoleLabel,
   aiProviderLabel,
   appendProjectMessage,
   completeMasterAgentTask,
@@ -70,7 +69,7 @@ const CLAW_RUNTIME_DEVICE_ID = "master-agent-claw";
 
 type ApiCompatibleProvider = Extract<
   AiProvider,
-  "openai_api" | "aliyun_qwen_api" | "minimax_api" | "glm_api" | "hyzq_api" | "custom_api"
+  "openai_api" | "aliyun_qwen_api" | "deepseek_api" | "minimax_api" | "glm_api" | "hyzq_api" | "custom_api"
 >;
 
 const API_PROVIDER_CONFIG: Record<
@@ -97,6 +96,13 @@ const API_PROVIDER_CONFIG: Record<
     loginLabel: "阿里百炼 API Key",
     protocol: "responses",
   },
+  deepseek_api: {
+    label: "DeepSeek API",
+    defaultBaseUrl: "https://api.deepseek.com",
+    defaultModel: "deepseek-v4-pro",
+    loginLabel: "DeepSeek API Key",
+    protocol: "chat_completions",
+  },
   minimax_api: {
     label: "MiniMax API",
     defaultBaseUrl: "https://api.minimaxi.com/v1",
@@ -130,6 +136,7 @@ const API_PROVIDER_CONFIG: Record<
 const API_PROVIDER_MODEL_OPTIONS: Record<ApiCompatibleProvider, string[]> = {
   openai_api: ["gpt-5.4-mini", "gpt-5.4", "gpt-5.1", "gpt-4.1"],
   aliyun_qwen_api: ["qwen3.5-plus", "qwen3.5-flash"],
+  deepseek_api: ["deepseek-v4-pro", "deepseek-v4-flash"],
   minimax_api: ["MiniMax-M1"],
   glm_api: ["glm-4.5"],
   hyzq_api: ["gpt-5.4-mini", "gpt-5.4"],
@@ -139,6 +146,7 @@ const API_PROVIDER_MODEL_OPTIONS: Record<ApiCompatibleProvider, string[]> = {
 const API_EXECUTION_PROVIDER_PRIORITY: ApiCompatibleProvider[] = [
   "hyzq_api",
   "openai_api",
+  "deepseek_api",
   "aliyun_qwen_api",
   "glm_api",
   "minimax_api",
@@ -528,7 +536,7 @@ export async function resolveMasterAgentExecutionConfig(
   const state = await readState();
   const resolvedAccountId = accountId?.trim() || state.user.account || runtime.account.accountId;
   const scopedAgentControls = await getProjectAgentControls(projectId, resolvedAccountId);
-  const modeResolution = resolveMasterAgentExecutionMode(scopedAgentControls, requestText);
+  const modeResolution = resolveMasterAgentExecutionMode(scopedAgentControls, requestText, runtime.account);
   const reasoningEffort =
     modeResolution.effectiveReasoningEffort ||
     (runtime.account as typeof runtime.account & { reasoningEffort?: ReasoningEffort }).reasoningEffort ||
@@ -584,12 +592,44 @@ function normalizeAgentControlText(value?: string | null) {
   return trimmed ? trimmed : undefined;
 }
 
-function resolveConfiguredFastModel(agentControls?: ProjectAgentControls | null) {
-  return normalizeAgentControlText(agentControls?.fastModelOverride) || DEFAULT_FAST_MODEL;
+function isProviderCompatibleModel(model: string | undefined, account?: AiAccount | null) {
+  if (!model || !account || !isApiCompatibleProvider(account.provider)) {
+    return true;
+  }
+  if (account.provider !== "deepseek_api") {
+    return true;
+  }
+  const modelOptions = API_PROVIDER_MODEL_OPTIONS[account.provider];
+  return modelOptions.length === 0 || modelOptions.includes(model);
 }
 
-function resolveConfiguredDeepModel(agentControls?: ProjectAgentControls | null) {
-  return normalizeAgentControlText(agentControls?.deepModelOverride) || DEFAULT_DEEP_MODEL;
+function normalizeAgentControlModelForAccount(value?: string | null, account?: AiAccount | null) {
+  const model = normalizeAgentControlText(value);
+  return isProviderCompatibleModel(model, account) ? model : undefined;
+}
+
+function defaultFastModelForAccount(account?: AiAccount | null) {
+  if (account && isApiCompatibleProvider(account.provider)) {
+    if (account.provider === "deepseek_api") return "deepseek-v4-flash";
+    if (account.provider === "aliyun_qwen_api") return "qwen3.5-flash";
+    return apiProviderConfig(account.provider).defaultModel;
+  }
+  return DEFAULT_FAST_MODEL;
+}
+
+function defaultDeepModelForAccount(account?: AiAccount | null) {
+  if (account && isApiCompatibleProvider(account.provider)) {
+    return account.model || apiProviderConfig(account.provider).defaultModel;
+  }
+  return DEFAULT_DEEP_MODEL;
+}
+
+function resolveConfiguredFastModel(agentControls?: ProjectAgentControls | null, account?: AiAccount | null) {
+  return normalizeAgentControlModelForAccount(agentControls?.fastModelOverride, account) || defaultFastModelForAccount(account);
+}
+
+function resolveConfiguredDeepModel(agentControls?: ProjectAgentControls | null, account?: AiAccount | null) {
+  return normalizeAgentControlModelForAccount(agentControls?.deepModelOverride, account) || defaultDeepModelForAccount(account);
 }
 
 export function shouldAutoEscalateMasterAgentRequest(requestText?: string | null) {
@@ -623,12 +663,21 @@ export function shouldAutoEscalateMasterAgentRequest(requestText?: string | null
 function resolveMasterAgentExecutionMode(
   agentControls?: ProjectAgentControls | null,
   requestText?: string | null,
+  account?: AiAccount | null,
 ): MasterAgentExecutionModeResolution {
   const storedAgentControls = agentControls ?? null;
-  const currentModelOverride = normalizeAgentControlText(agentControls?.modelOverride);
+  const currentModelOverride = normalizeAgentControlModelForAccount(agentControls?.modelOverride, account);
   const currentReasoningEffort = agentControls?.reasoningEffortOverride;
-  const fastModelOverride = resolveConfiguredFastModel(agentControls);
-  const deepModelOverride = resolveConfiguredDeepModel(agentControls);
+  const fastModelOverride = resolveConfiguredFastModel(agentControls, account);
+  const deepModelOverride = resolveConfiguredDeepModel(agentControls, account);
+  const effectiveStoredAgentControls: ProjectAgentControls | null = agentControls
+    ? {
+        ...agentControls,
+        modelOverride: currentModelOverride,
+        fastModelOverride,
+        deepModelOverride,
+      }
+    : null;
 
   let activeMode: MasterAgentExecutionModeResolution["activeMode"] = "custom";
   if (!currentModelOverride && !currentReasoningEffort) {
@@ -663,7 +712,7 @@ function resolveMasterAgentExecutionMode(
 
   return {
     storedAgentControls,
-    effectiveAgentControls: storedAgentControls,
+    effectiveAgentControls: effectiveStoredAgentControls,
     activeMode,
     effectiveMode: activeMode,
     fastPathEligible: activeMode === "fast",
@@ -1616,6 +1665,7 @@ function isApiCompatibleProvider(provider: AiProvider): provider is ApiCompatibl
   return (
     provider === "openai_api" ||
     provider === "aliyun_qwen_api" ||
+    provider === "deepseek_api" ||
     provider === "minimax_api" ||
     provider === "glm_api" ||
     provider === "hyzq_api" ||
@@ -2263,7 +2313,7 @@ async function queueAndStartOpenAiMasterAgentReply(params: {
             taskId: params.taskId,
             deviceId: candidate.deviceId,
             accountId: candidate.account.accountId,
-            accountLabel: candidate.account.label,
+            accountLabel: candidate.model,
           });
         }
 
@@ -2392,7 +2442,7 @@ async function enqueueOpenAiMasterAgentReply(params: {
     requestedByAccount: params.requestedByAccount,
     deviceId: primaryCandidate.deviceId,
     accountId: primaryCandidate.account.accountId,
-    accountLabel: primaryCandidate.account.label,
+    accountLabel: primaryCandidate.model,
     ...params.taskAuthorization,
     relayViaMasterAgent: params.relayViaMasterAgent,
     externalReplyTarget: params.externalReplyTarget,
@@ -3683,6 +3733,8 @@ export async function replyToMasterAgentUserMessage(params: {
   const replyMetadata = buildMasterAgentModeMetadata(modeResolution);
   const controlIntent = classifyMasterAgentControlIntent(params.requestText);
   const relayViaMasterAgent = params.interactionMode === "takeover_single_thread";
+  const forcePrimaryApiExecution =
+    isApiCompatibleProvider(runtime.account.provider) && Boolean(runtime.account.apiKey?.trim());
   const selectedMasterAccount = await resolveMasterNodeExecutionCandidate({
     backendChoices,
     runtimeAccount: runtime.account,
@@ -3700,13 +3752,16 @@ export async function replyToMasterAgentUserMessage(params: {
     modeResolution,
     backendOverride: executionConfig.agentControls?.backendOverride,
   });
+  const selectedReplyBackendId = forcePrimaryApiExecution && apiExecutionCandidates.length > 0
+    ? "openai-api"
+    : selectedBackend.backendId;
   const replyMode = resolveMasterAgentReplyMode({
     requestedMode: params.mode,
     selectedBackendId: preferApiExecutionForSmartMode && apiExecutionCandidates.length > 0
       ? apiExecutionCandidates[0]?.provider === "aliyun_qwen_api"
         ? "aliyun-qwen"
         : "openai-api"
-      : selectedBackend.backendId,
+      : selectedReplyBackendId,
     apiCandidateCount: apiExecutionCandidates.length,
     modeResolution,
   });
@@ -4019,7 +4074,7 @@ export async function replyToMasterAgentUserMessage(params: {
 
     if (
       apiExecutionCandidates.length > 0 &&
-      (preferApiExecutionForSmartMode || selectedBackend.backendId !== "master-codex-node")
+      (forcePrimaryApiExecution || preferApiExecutionForSmartMode || selectedBackend.backendId !== "master-codex-node")
     ) {
       const queuedReply = await enqueueOpenAiMasterAgentReply({
         candidates: apiExecutionCandidates,
@@ -4080,7 +4135,7 @@ export async function replyToMasterAgentUserMessage(params: {
     }
   }
 
-  if (selectedBackend.backendId === "master-codex-node" && !preferApiExecutionForSmartMode) {
+  if (selectedBackend.backendId === "master-codex-node" && !preferApiExecutionForSmartMode && !forcePrimaryApiExecution) {
     return runMasterNodeExecution();
   }
 
@@ -4093,7 +4148,7 @@ export async function replyToMasterAgentUserMessage(params: {
         requestText: params.requestText,
         projectId: replyProjectId,
         currentSessionExpiresAt: params.currentSessionExpiresAt,
-        senderLabel: `主 Agent · ${candidate.account.label || aiRoleLabel(candidate.account.role)}`,
+        senderLabel: `主 Agent · ${candidate.model}`,
         agentControls,
         promptPolicy: executionConfig.promptPolicy,
         userPrompt: executionConfig.userPrompt,
diff --git a/src/lib/boss-projections.ts b/src/lib/boss-projections.ts
index aa08d1e..109c3c5 100644
--- a/src/lib/boss-projections.ts
+++ b/src/lib/boss-projections.ts
@@ -363,6 +363,8 @@ function aiProviderLabel(provider: AiProvider) {
       return "OpenAI API";
     case "aliyun_qwen_api":
       return "阿里百炼 Qwen";
+    case "deepseek_api":
+      return "DeepSeek API";
     default:
       return provider;
   }
diff --git a/tests/ai-account-validation.test.ts b/tests/ai-account-validation.test.ts
index 11d5f5f..da07f7f 100644
--- a/tests/ai-account-validation.test.ts
+++ b/tests/ai-account-validation.test.ts
@@ -249,6 +249,68 @@ test("validateAiAccountConnection probes GLM accounts through chat completions",
   }
 });
 
+test("validateAiAccountConnection probes DeepSeek V4 accounts through chat completions", async () => {
+  await setup();
+
+  await saveAiAccount({
+    accountId: "deepseek-primary",
+    label: "主要API",
+    role: "primary",
+    provider: "deepseek_api",
+    displayName: "DeepSeek V4 主链路",
+    accountIdentifier: "deepseek-demo",
+    model: "deepseek-v4-pro",
+    apiKey: "sk-deepseek-demo-123456",
+    enabled: true,
+  });
+
+  const originalFetch = globalThis.fetch;
+  globalThis.fetch = (async (input) => {
+    if (typeof input === "string" && input === "https://api.deepseek.com/chat/completions") {
+      return new Response(JSON.stringify({
+        choices: [
+          {
+            message: {
+              content: "连接正常",
+            },
+          },
+        ],
+      }), {
+        status: 200,
+        headers: {
+          "content-type": "application/json",
+          "x-request-id": "req-deepseek-validate",
+        },
+      });
+    }
+    if (typeof input === "string" && input === "https://api.deepseek.com/models") {
+      return new Response(JSON.stringify({
+        data: [
+          { id: "deepseek-v4-pro" },
+          { id: "deepseek-v4-flash" },
+        ],
+      }), {
+        status: 200,
+        headers: {
+          "content-type": "application/json",
+        },
+      });
+    }
+    throw new Error(`unexpected fetch: ${String(input)}`);
+  }) as typeof fetch;
+
+  try {
+    const result = await validateAiAccountConnection("deepseek-primary");
+    assert.equal(result.ok, true);
+    assert.equal(result.status, "ready");
+    assert.equal(result.requestId, "req-deepseek-validate");
+    assert.match(result.message, /连接正常/);
+    assert.deepEqual(result.availableModels, ["deepseek-v4-pro", "deepseek-v4-flash"]);
+  } finally {
+    globalThis.fetch = originalFetch;
+  }
+});
+
 test("validateAiAccountConnection falls back to generic models for custom api accounts", async () => {
   await setup();
 
diff --git a/tests/master-agent-openai-fallback.test.ts b/tests/master-agent-openai-fallback.test.ts
index 8b8853b..8bbe444 100644
--- a/tests/master-agent-openai-fallback.test.ts
+++ b/tests/master-agent-openai-fallback.test.ts
@@ -113,7 +113,7 @@ test("replyToMasterAgentUserMessage falls back to a runnable OpenAI API account
     const reply = masterProject?.messages.at(-1);
     assert.ok(reply, "expected a master-agent reply to be appended");
     assert.equal(reply?.sender, "master");
-    assert.equal(reply?.senderLabel, "主 Agent · 备用 GPT");
+    assert.equal(reply?.senderLabel, "主 Agent · gpt-5.4");
     assert.match(reply?.body ?? "", /主Agent链路正常/);
   } finally {
     globalThis.fetch = originalFetch;
@@ -194,6 +194,64 @@ test("replyToMasterAgentUserMessage can retry the same degraded API account when
   }
 });
 
+test("replyToMasterAgentUserMessage uses active DeepSeek API accounts directly", async () => {
+  await saveAiAccount({
+    accountId: "deepseek-primary",
+    label: "DeepSeek 主控",
+    role: "primary",
+    provider: "deepseek_api",
+    displayName: "DeepSeek V4 主链路",
+    model: "deepseek-v4-pro",
+    apiKey: "sk-deepseek-demo-123456",
+    enabled: true,
+    setActive: true,
+    loginStatusNote: "DeepSeek API 主链路。",
+  });
+
+  const originalFetch = globalThis.fetch;
+  globalThis.fetch = (async (input) => {
+    if (typeof input === "string" && input === "https://api.deepseek.com/chat/completions") {
+      return new Response(JSON.stringify({
+        choices: [
+          {
+            message: {
+              content: "DeepSeek 主链路正常。",
+            },
+          },
+        ],
+      }), {
+        status: 200,
+        headers: {
+          "content-type": "application/json",
+          "x-request-id": "req-deepseek-primary",
+        },
+      });
+    }
+    throw new Error(`unexpected fetch: ${String(input)}`);
+  }) as typeof fetch;
+
+  try {
+    const result = await replyToMasterAgentUserMessage({
+      requestMessageId: "msg-deepseek-primary",
+      requestText: "请只回复：DeepSeek 主链路正常。",
+      requestedBy: "Boss 超级管理员",
+      requestedByAccount: "krisolo",
+      mode: "wait",
+    });
+
+    assert.equal(result.ok, true);
+    assert.equal(result.accountId, "deepseek-primary");
+    assert.equal(result.requestId, "req-deepseek-primary");
+
+    const state = await readState();
+    const reply = state.projects.find((project) => project.id === "master-agent")?.messages.at(-1);
+    assert.equal(reply?.senderLabel, "主 Agent · deepseek-v4-pro");
+    assert.match(reply?.body ?? "", /DeepSeek 主链路正常/);
+  } finally {
+    globalThis.fetch = originalFetch;
+  }
+});
+
 test("replyToMasterAgentUserMessage falls back to a runnable aliyun qwen backup account when the master node is offline", async () => {
   await saveAiAccount({
     accountId: "master-codex-primary",
@@ -254,7 +312,7 @@ test("replyToMasterAgentUserMessage falls back to a runnable aliyun qwen backup
     const reply = masterProject?.messages.at(-1);
     assert.ok(reply, "expected a master-agent reply to be appended");
     assert.equal(reply?.sender, "master");
-    assert.equal(reply?.senderLabel, "主 Agent · 阿里备用");
+    assert.equal(reply?.senderLabel, "主 Agent · qwen3.5-plus");
     assert.match(reply?.body ?? "", /阿里备用链路正常/);
   } finally {
     globalThis.fetch = originalFetch;