diff --git a/mateclaw-server/src/main/java/vip/mate/agent/AgentService.java b/mateclaw-server/src/main/java/vip/mate/agent/AgentService.java
index 8c59deda..be92acb7 100644
--- a/mateclaw-server/src/main/java/vip/mate/agent/AgentService.java
+++ b/mateclaw-server/src/main/java/vip/mate/agent/AgentService.java
@@ -146,6 +146,11 @@ public class AgentService {
 
     public AgentEntity createAgent(AgentEntity agent) {
         agent.setEnabled(true);
+        // Match the runtime fallback before insert; older schemas default to 10.
+        // Explicit budgets (including 0 for no soft cap) remain user-controlled.
+        if (agent.getMaxIterations() == null) {
+            agent.setMaxIterations(100);
+        }
         if (agent.getAgentType() == null) {
             agent.setAgentType("react");
         }
diff --git a/mateclaw-server/src/test/java/vip/mate/agent/AgentServiceIterationBudgetTest.java b/mateclaw-server/src/test/java/vip/mate/agent/AgentServiceIterationBudgetTest.java
new file mode 100644
index 00000000..fe21d893
--- /dev/null
+++ b/mateclaw-server/src/test/java/vip/mate/agent/AgentServiceIterationBudgetTest.java
@@ -0,0 +1,54 @@
+package vip.mate.agent;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.ValueSource;
+import vip.mate.agent.model.AgentEntity;
+import vip.mate.agent.repository.AgentMapper;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.mockito.Mockito.*;
+
+class AgentServiceIterationBudgetTest {
+    private final AgentMapper mapper = mock(AgentMapper.class);
+    private final AgentService service = new AgentService(mapper, null, null, null, null, null, null);
+
+    @Test
+    void omittedBudgetIsStoredAsOneHundredInsteadOfUsingDatabaseDefault() {
+        AgentEntity agent = new AgentEntity();
+        agent.setName("Research assistant");
+        doAnswer(invocation -> {
+            AgentEntity inserted = invocation.getArgument(0);
+            assertEquals(100, inserted.getMaxIterations());
+            return 1;
+        }).when(mapper).insert(any(AgentEntity.class));
+
+        assertEquals(100, service.createAgent(agent).getMaxIterations());
+        verify(mapper).insert(agent);
+    }
+
+    @ParameterizedTest
+    @ValueSource(ints = {0, 10, 150})
+    void explicitCreationBudgetIsPreserved(int budget) {
+        AgentEntity agent = new AgentEntity();
+        agent.setName("Custom assistant");
+        agent.setMaxIterations(budget);
+        assertEquals(budget, service.createAgent(agent).getMaxIterations());
+        verify(mapper).insert(agent);
+    }
+
+    @Test
+    void editingExistingAgentRetainsItsSmallBudget() {
+        AgentEntity agent = new AgentEntity();
+        agent.setId(1L);
+        agent.setName("Existing assistant");
+        agent.setMaxIterations(10);
+        agent.setDescription("Updated description");
+        when(mapper.selectById(1L)).thenReturn(agent);
+
+        service.updateAgent(agent);
+
+        assertEquals(10, agent.getMaxIterations());
+        verify(mapper).updateById(agent);
+    }
+}
diff --git a/mateclaw-ui/src/components/chat/MessageBubble.vue b/mateclaw-ui/src/components/chat/MessageBubble.vue
index 5a2a8f41..b416e6f4 100644
--- a/mateclaw-ui/src/components/chat/MessageBubble.vue
+++ b/mateclaw-ui/src/components/chat/MessageBubble.vue
@@ -263,6 +263,16 @@
           </div>
         </div>
 
+        <!-- Use the persisted finish reason so a model's wrap-up cannot hide
+             an iteration-cap exit. Hide intermediate caps during goal continuation. -->
+        <div v-if="isIterationLimitReached" class="incomplete-card iteration-limit-card" role="status">
+          <div class="incomplete-card__header">
+            <el-icon class="incomplete-card__icon"><WarningFilled /></el-icon>
+            <span class="incomplete-card__title">{{ $t('chat.iterationLimitTitle') }}</span>
+          </div>
+          <p class="incomplete-card__description">{{ $t('chat.iterationLimitDescription') }}</p>
+        </div>
+
         <!--
           EVIDENCE_INSUFFICIENT banner (info color, not warning). Run completed
           fully — the answer text is preserved above; the model just cited
@@ -1363,6 +1373,11 @@ const isIncomplete = computed<boolean>(() => {
   return parsedMetadata.value?.finishReason === 'incomplete'
 })
 
+const isIterationLimitReached = computed<boolean>(() =>
+  props.message.role === 'assistant' && !isGenerating.value
+  && parsedMetadata.value?.finishReason === 'max_iterations_reached'
+)
+
 /**
  * True when the graph completed normally but {@code SourceEvidenceLedger}
  * found unsupported references. The visible answer is full and persisted;
diff --git a/mateclaw-ui/src/components/chat/__tests__/MessageBubble.stopIndicator.test.ts b/mateclaw-ui/src/components/chat/__tests__/MessageBubble.stopIndicator.test.ts
index 77c55ea3..b4be61a0 100644
--- a/mateclaw-ui/src/components/chat/__tests__/MessageBubble.stopIndicator.test.ts
+++ b/mateclaw-ui/src/components/chat/__tests__/MessageBubble.stopIndicator.test.ts
@@ -1,4 +1,4 @@
-import { createApp, defineComponent, h } from 'vue'
+import { computed, createApp, defineComponent, h } from 'vue'
 import { createI18n } from 'vue-i18n'
 import { createPinia } from 'pinia'
 import { afterEach, describe, expect, it, vi } from 'vitest'
@@ -7,8 +7,8 @@ import zhCN from '@/i18n/locales/zh-CN'
 import enUS from '@/i18n/locales/en-US'
 
 vi.mock('@/composables/useStreamingMarkdown', () => ({
-  useStreamingMarkdown: (content: unknown) => ({
-    renderedContent: content,
+  useStreamingMarkdown: (content: () => string) => ({
+    html: computed(content),
     copyCode: vi.fn(),
   }),
 }))
@@ -78,6 +78,8 @@ function mountMessage(message: Message, locale = 'zh-CN') {
         chat: {
           incompleteTitle: zhCN.chat.incompleteTitle,
           incompleteDescription: zhCN.chat.incompleteDescription,
+          iterationLimitTitle: zhCN.chat.iterationLimitTitle,
+          iterationLimitDescription: zhCN.chat.iterationLimitDescription,
           stopped: '已被用户手动中止',
           interrupted: '已中断并继续处理下一条消息',
         },
@@ -86,6 +88,8 @@ function mountMessage(message: Message, locale = 'zh-CN') {
         chat: {
           incompleteTitle: enUS.chat.incompleteTitle,
           incompleteDescription: enUS.chat.incompleteDescription,
+          iterationLimitTitle: enUS.chat.iterationLimitTitle,
+          iterationLimitDescription: enUS.chat.iterationLimitDescription,
           stopped: 'Stopped manually by user',
           interrupted: 'Interrupted and continued with the next message',
         },
@@ -220,3 +224,46 @@ describe('MessageBubble incomplete answer (#660)', () => {
     expect(host.querySelector('.incomplete-card__retry')).not.toBeNull()
   })
 })
+
+describe('MessageBubble iteration limit (#674)', () => {
+  it.each(['zh-CN', 'en'])('explains the incomplete task and recovery options (%s)', locale => {
+    const host = mountMessage({ id: 'limit', conversationId: 'conv', role: 'assistant',
+      content: 'Partial answer', contentParts: [], status: 'completed',
+      metadata: { finishReason: 'max_iterations_reached' } } as Message, locale)
+
+    const card = host.querySelector('.iteration-limit-card')
+    expect(card).not.toBeNull()
+    expect(card!.textContent).toContain(locale === 'zh-CN' ? '任务尚未完成' : 'Task is incomplete')
+    expect(card!.textContent).toContain(locale === 'zh-CN' ? '最大迭代次数' : 'Max Iterations')
+    expect(host.textContent).toContain('Partial answer')
+    expect(host.querySelector('.incomplete-card__retry')).toBeNull()
+  })
+
+  it('renders the limit notice for segmented history with serialized metadata', () => {
+    const host = mountMessage({ id: 'history-limit', conversationId: 'conv', role: 'assistant',
+      content: '', contentParts: [], status: 'completed', metadata: JSON.stringify({
+        finishReason: 'max_iterations_reached',
+        segments: [
+          { id: 'tool', type: 'tool_call', toolName: 'search', status: 'completed', seq: 0 },
+          { id: 'content', type: 'content', text: 'Saved partial answer', status: 'completed', seq: 1 },
+        ],
+      }) } as Message)
+
+    expect(host.querySelector('.segments-view')).not.toBeNull()
+    expect(host.querySelector('.iteration-limit-card')).not.toBeNull()
+    expect(host.textContent).toContain('Saved partial answer')
+  })
+
+  it.each(['normal', 'incomplete', 'evidence_insufficient'])('does not show an iteration warning for %s', finishReason => {
+    const host = mountMessage({ id: 'other', conversationId: 'conv', role: 'assistant',
+      content: 'Answer', contentParts: [], status: 'completed', metadata: { finishReason } } as Message)
+    expect(host.querySelector('.iteration-limit-card')).toBeNull()
+  })
+
+  it('suppresses an intermediate limit notice while the goal is continuing', () => {
+    const host = mountMessage({ id: 'continuing', conversationId: 'conv', role: 'assistant',
+      content: 'Working', contentParts: [], status: 'generating',
+      metadata: { finishReason: 'max_iterations_reached' } } as Message)
+    expect(host.querySelector('.iteration-limit-card')).toBeNull()
+  })
+})
diff --git a/mateclaw-ui/src/i18n/locales/en-US.ts b/mateclaw-ui/src/i18n/locales/en-US.ts
index c87499b4..79acdbfe 100644
--- a/mateclaw-ui/src/i18n/locales/en-US.ts
+++ b/mateclaw-ui/src/i18n/locales/en-US.ts
@@ -702,6 +702,8 @@ export default {
     incompleteTitle: 'Answer is incomplete',
     incompleteDescription: 'This answer did not finish. Check the message for the reason: repeated output, a reasoning safety limit, or an exhausted output token budget. Regenerate, adjust thinking and output budgets, or split the task to continue.',
     incompleteRetry: 'Regenerate',
+    iterationLimitTitle: 'Task is incomplete: iteration limit reached',
+    iterationLimitDescription: 'This run reached its iteration limit. Results so far are preserved. Increase “Max Iterations” in the agent settings, or split the task and send a follow-up to continue.',
     // EVIDENCE_INSUFFICIENT info card (finishReason=evidence_insufficient)
     evidenceTitle: 'Run completed — some source references could not be verified',
     evidenceDescription: 'The full answer is preserved above. The classes/files listed in the trailing "[evidence insufficient] …" line were not actually opened during this run; the model may have inferred them from naming. Ask a follow-up to have each one read before relying on those references.',
diff --git a/mateclaw-ui/src/i18n/locales/zh-CN.ts b/mateclaw-ui/src/i18n/locales/zh-CN.ts
index 95584846..99b9ca21 100644
--- a/mateclaw-ui/src/i18n/locales/zh-CN.ts
+++ b/mateclaw-ui/src/i18n/locales/zh-CN.ts
@@ -702,6 +702,8 @@ export default {
     incompleteTitle: '回答尚未完成',
     incompleteDescription: '本次回答未完成，具体原因请查看消息内容：可能是重复输出触发保护、思考达到安全上限，或模型耗尽输出 token 预算。可重新生成、调整思考和输出预算，或拆分任务后继续。',
     incompleteRetry: '重新生成',
+    iterationLimitTitle: '任务尚未完成：已达迭代上限',
+    iterationLimitDescription: '本次运行已达到最大迭代次数，已保留当前结果。可在 Agent 设置中调高「最大迭代次数」，或拆分任务后发送消息继续。',
     // EVIDENCE_INSUFFICIENT 提示卡（finishReason=evidence_insufficient）
     evidenceTitle: '任务已完成，但部分源码引用未被验证',
     evidenceDescription: '回答全文已保留并展示。底部「[证据不足] …」列出的类/文件并未在本次工具结果里被实际读取，模型可能基于命名推断。如需确认这些引用，请追问让模型逐一读取后再下结论。',
diff --git a/mateclaw-ui/src/views/AgentCreateWizard.vue b/mateclaw-ui/src/views/AgentCreateWizard.vue
index 9043034e..fe3aeea1 100644
--- a/mateclaw-ui/src/views/AgentCreateWizard.vue
+++ b/mateclaw-ui/src/views/AgentCreateWizard.vue
@@ -364,7 +364,7 @@ async function confirmCreate() {
       systemPrompt: draft.value.systemPrompt,
       tags,
       enabled: true,
-      maxIterations: 10,
+      maxIterations: 100,
       // primaryKbId kept as string to preserve Snowflake precision.
       primaryKbId: selectedKbId.value,
     }
diff --git a/mateclaw-ui/src/views/Agents.vue b/mateclaw-ui/src/views/Agents.vue
index 3cba51ea..24b0aa0f 100644
--- a/mateclaw-ui/src/views/Agents.vue
+++ b/mateclaw-ui/src/views/Agents.vue
@@ -1008,7 +1008,7 @@ const defaultForm = (): Partial<Agent> & { name: string; defaultThinkingLevel: s
   runtimeConfig: null,
   systemPrompt: '',
   modelName: '', // RFC-03 G1 — empty means "use global default"
-  maxIterations: 10,
+  maxIterations: 100,
   // Empty so SkillIcon's fallback (🤖) shows instead of pinning a literal
   // emoji into form.icon — otherwise the picker thinks the user picked
   // the robot emoji explicitly and reopens on the Emoji tab.
diff --git a/mateclaw-ui/src/views/__tests__/AgentCreateWizard.iterationBudget.test.ts b/mateclaw-ui/src/views/__tests__/AgentCreateWizard.iterationBudget.test.ts
new file mode 100644
index 00000000..824f7db7
--- /dev/null
+++ b/mateclaw-ui/src/views/__tests__/AgentCreateWizard.iterationBudget.test.ts
@@ -0,0 +1,50 @@
+import { createApp, defineComponent, nextTick } from 'vue'
+import { createI18n } from 'vue-i18n'
+import { afterEach, expect, it, vi } from 'vitest'
+import zhCN from '@/i18n/locales/zh-CN'
+import { agentApi, agentBindingApi } from '@/api'
+import AgentCreateWizard from '../AgentCreateWizard.vue'
+
+vi.mock('vue-router', () => ({ useRouter: () => ({ push: vi.fn() }) }))
+vi.mock('@/api', () => ({
+  agentApi: { generate: vi.fn(), create: vi.fn() },
+  agentBindingApi: { setSkills: vi.fn(), setTools: vi.fn() },
+  toolApi: { listAvailable: vi.fn().mockResolvedValue({ data: [] }) },
+  skillApi: { page: vi.fn().mockResolvedValue({ data: [] }) },
+  wikiApi: { listBindableKBs: vi.fn().mockResolvedValue({ data: [] }) },
+}))
+vi.mock('@/composables/useMcToast', () => ({ mcToast: { error: vi.fn(), success: vi.fn() } }))
+vi.mock('@/components/common/SkillIcon.vue', () => ({ default: defineComponent({ template: '<span />' }) }))
+vi.mock('@/components/common/SkillIconPicker.vue', () => ({ default: defineComponent({ template: '<span />' }) }))
+vi.mock('@/components/agent/WizardCapabilityPicker.vue', () => ({ default: defineComponent({ template: '<span />' }) }))
+
+let app: ReturnType<typeof createApp> | undefined
+afterEach(() => {
+  app?.unmount()
+  document.body.innerHTML = ''
+  vi.clearAllMocks()
+})
+
+it('creates the generated agent with a 100-round budget so complex tasks can exceed ten rounds', async () => {
+  vi.mocked(agentApi.generate).mockResolvedValue({ data: { name: 'Research assistant' } } as never)
+  vi.mocked(agentApi.create).mockResolvedValue({ data: { id: '123', name: 'Research assistant' } } as never)
+  vi.mocked(agentBindingApi.setSkills).mockResolvedValue({} as never)
+  vi.mocked(agentBindingApi.setTools).mockResolvedValue({} as never)
+  const host = document.createElement('div')
+  document.body.appendChild(host)
+  app = createApp(AgentCreateWizard)
+  app.use(createI18n({ legacy: false, locale: 'zh-CN', messages: { 'zh-CN': zhCN } }))
+  app.mount(host)
+
+  const input = host.querySelector('textarea')!
+  input.value = 'Research a complex task'
+  input.dispatchEvent(new Event('input', { bubbles: true }))
+  await nextTick()
+  host.querySelector<HTMLButtonElement>('.wiz-btn-primary')!.click()
+  await vi.waitFor(() => expect(host.querySelector('.wiz-notice')).not.toBeNull())
+  host.querySelector<HTMLButtonElement>('.wiz-actions .wiz-btn-primary')!.click()
+
+  await vi.waitFor(() => expect(agentApi.create).toHaveBeenCalledWith(expect.objectContaining({
+    name: 'Research assistant', maxIterations: 100,
+  })))
+})