diff --git a/docs/reference/spec-v01-backend-adapter.md b/docs/reference/spec-v01-backend-adapter.md
index 18d957f..aa88e9e 100644
--- a/docs/reference/spec-v01-backend-adapter.md
+++ b/docs/reference/spec-v01-backend-adapter.md
@@ -69,6 +69,8 @@ Adapter 输出给 runner 的 event 类型至少包括：
 
 事件必须有上限和分页友好形态。大型日志、完整 stdout 或完整 trace 应进入 logPath 或后续 artifact，不得一次性塞入单个 event 造成输出爆炸。
 
+Codex app-server 的低价值内部 notification 必须在 AgentRun adapter 层收敛，不得要求 HWLAB Web/CLI 或其他消费侧自行过滤。以下事件默认不作为 durable trace event 持久化：`item/reasoning/textDelta`、纯 `reasoning` item 的 `item/started|item/completed`、`thread/tokenUsage/updated`、`account/rateLimits/updated`、普通 `warning` 和 `configWarning`。adapter 可以输出一条有界 `backend_status.phase=codex-app-server-notifications-suppressed` 摘要，只包含计数、method 和 item type，不包含 reasoning 文本、Secret、token 或 env value。真实 `agentMessage`、`commandExecution`、`command_output`、error、terminal 和生命周期事件必须继续保留。
+
 ## Failure Mapping
 
 Adapter 必须把 backend 错误映射为稳定 failureKind：
diff --git a/src/backend/codex-stdio.ts b/src/backend/codex-stdio.ts
index 706434c..7bdb053 100644
--- a/src/backend/codex-stdio.ts
+++ b/src/backend/codex-stdio.ts
@@ -62,6 +62,12 @@ interface CompletedAssistantMessage {
   text: string;
 }
 
+interface SuppressedNotificationSummary {
+  total: number;
+  byMethod: Record<string, number>;
+  byItemType: Record<string, number>;
+}
+
 interface CodexStdioCloseInfo extends JsonRecord {
   code: number | null;
   signal: string | null;
@@ -382,6 +388,7 @@ async function runCodexStdioTurnWithSession(options: CodexStdioTurnOptions, sess
   }
   let assistantText = "";
   const completedAssistantMessages: CompletedAssistantMessage[] = [];
+  const suppressedNotifications = createSuppressedNotificationSummary();
   let threadId: string | undefined = options.threadId;
   let turnId: string | undefined;
   let terminal: { status: TerminalStatus; failureKind: FailureKind | null; message: string | null } | null = null;
@@ -405,7 +412,7 @@ async function runCodexStdioTurnWithSession(options: CodexStdioTurnOptions, sess
     terminalResolve();
   }, positiveTimeout(options.timeoutMs));
   const stopNotifications = session.addNotificationHandler((message) => {
-    const normalized = normalizeCodexNotification(message);
+    const normalized = normalizeCodexNotification(message, suppressedNotifications);
     if (normalized.threadId) threadId = normalized.threadId;
     if (normalized.turnId) turnId = normalized.turnId;
     emitEvents(normalized.events);
@@ -480,6 +487,7 @@ async function runCodexStdioTurnWithSession(options: CodexStdioTurnOptions, sess
   if (!terminal) terminal = { status: "failed", failureKind: "backend-response-invalid", message: "codex app-server finished without terminal status" };
   if (terminal.status !== "completed") emitEvents(await session.close());
   if (completedAssistantMessages.length === 0) emitEvents(assistantMessageEventsForTurn(assistantText, terminal.status === "completed"));
+  emitEvents(suppressedNotificationEvents(suppressedNotifications));
   emitEvent({ type: "terminal_status", payload: { terminalStatus: terminal.status, failureKind: terminal.failureKind, message: terminal.message } });
   await liveEventWrite;
   return { terminalStatus: terminal.status, failureKind: terminal.failureKind, failureMessage: terminal.message, events: events.map((event) => ({ ...event, payload: redactJson(event.payload) })), ...(threadId ? { threadId } : {}), ...(turnId ? { turnId } : {}) };
@@ -541,7 +549,7 @@ function codexHomeReadiness(codexHome: string): BackendTurnResult | null {
   };
 }
 
-function normalizeCodexNotification(message: JsonRecord): { events: BackendEvent[]; assistantDelta?: string; completedAssistantMessage?: CompletedAssistantMessage; threadId?: string; turnId?: string; terminal?: { status: TerminalStatus; failureKind: FailureKind | null; message: string | null } } {
+function normalizeCodexNotification(message: JsonRecord, suppressed: SuppressedNotificationSummary): { events: BackendEvent[]; assistantDelta?: string; completedAssistantMessage?: CompletedAssistantMessage; threadId?: string; turnId?: string; terminal?: { status: TerminalStatus; failureKind: FailureKind | null; message: string | null } } {
   const method = typeof message.method === "string" ? message.method : "unknown";
   const params = asRecordAt(message, "params");
   if (method === "thread/started") {
@@ -552,8 +560,16 @@ function normalizeCodexNotification(message: JsonRecord): { events: BackendEvent
     const turnId = stringAt(asRecordAt(params, "turn"), "id");
     return { events: [{ type: "backend_status", payload: { phase: method, turnId } }], ...(turnId ? { turnId } : {}) };
   }
+  if (isSuppressedCodexStatusNotification(method)) {
+    recordSuppressedNotification(suppressed, method);
+    return { events: [] };
+  }
   if (method === "item/agentMessage/delta") return { events: [], assistantDelta: typeof params.delta === "string" ? params.delta : "" };
   if (method === "item/commandExecution/outputDelta") return { events: [{ type: "command_output", payload: commandOutputPayload("stdout", typeof params.delta === "string" ? params.delta : "") }] };
+  if (method === "item/reasoning/textDelta") {
+    recordSuppressedNotification(suppressed, method, "reasoning");
+    return { events: [] };
+  }
   if ((method === "item/started" || method === "item/completed") && asRecordAt(params, "item").type === "agentMessage") {
     const item = asRecordAt(params, "item");
     const itemId = stringAt(item, "id") ?? stringAt(params, "itemId");
@@ -564,7 +580,15 @@ function normalizeCodexNotification(message: JsonRecord): { events: BackendEvent
       ...(completedAssistantMessage ? { completedAssistantMessage } : {}),
     };
   }
-  if (method === "item/started" || method === "item/completed") return { events: [{ type: "tool_call", payload: toolCallPayload(method, asRecordAt(params, "item")) }] };
+  if (method === "item/started" || method === "item/completed") {
+    const item = asRecordAt(params, "item");
+    const itemType = typeof item.type === "string" ? item.type : "unknown";
+    if (isSuppressedCodexItemType(itemType)) {
+      recordSuppressedNotification(suppressed, method, itemType);
+      return { events: [] };
+    }
+    return { events: [{ type: "tool_call", payload: toolCallPayload(method, item) }] };
+  }
   if (method === "error") {
     const error = asRecordAt(params, "error");
     const messageText = typeof error.message === "string" ? error.message : "Codex app-server error";
@@ -588,6 +612,42 @@ function normalizeCodexNotification(message: JsonRecord): { events: BackendEvent
   return { events: [{ type: "backend_status", payload: { phase: method } }] };
 }
 
+function createSuppressedNotificationSummary(): SuppressedNotificationSummary {
+  return { total: 0, byMethod: {}, byItemType: {} };
+}
+
+function recordSuppressedNotification(summary: SuppressedNotificationSummary, method: string, itemType?: string): void {
+  summary.total += 1;
+  summary.byMethod[method] = (summary.byMethod[method] ?? 0) + 1;
+  if (itemType) summary.byItemType[itemType] = (summary.byItemType[itemType] ?? 0) + 1;
+}
+
+function suppressedNotificationEvents(summary: SuppressedNotificationSummary): BackendEvent[] {
+  if (summary.total === 0) return [];
+  return [{
+    type: "backend_status",
+    payload: {
+      phase: "codex-app-server-notifications-suppressed",
+      total: summary.total,
+      byMethod: sortCountRecord(summary.byMethod),
+      byItemType: sortCountRecord(summary.byItemType),
+      valuesPrinted: false,
+    },
+  }];
+}
+
+function sortCountRecord(input: Record<string, number>): JsonRecord {
+  return Object.fromEntries(Object.entries(input).sort(([left], [right]) => left.localeCompare(right))) as JsonRecord;
+}
+
+function isSuppressedCodexStatusNotification(method: string): boolean {
+  return method === "thread/tokenUsage/updated" || method === "account/rateLimits/updated" || method === "warning" || method === "configWarning";
+}
+
+function isSuppressedCodexItemType(itemType: string): boolean {
+  return itemType === "reasoning";
+}
+
 function assistantMessageEventForCompleted(message: CompletedAssistantMessage, messageIndex: number): BackendEvent {
   return {
     type: "assistant_message",
diff --git a/src/selftest/cases/30-codex-stdio.ts b/src/selftest/cases/30-codex-stdio.ts
index 4965323..eef8c67 100644
--- a/src/selftest/cases/30-codex-stdio.ts
+++ b/src/selftest/cases/30-codex-stdio.ts
@@ -120,6 +120,25 @@ const selfTest: SelfTestCase = async (context) => {
     const liveResult = await livePromise;
     assert.equal(liveResult.terminalStatus, "completed", "slow live tool event turn should complete");
 
+    const noisy = await createRunWithCommand(client, context, "hello noisy reasoning", "selftest-noisy-reasoning-events", 15_000);
+    const noisyResult = await runOnce({ managerUrl: server.baseUrl, runId: noisy.runId, codexCommand: context.fakeCodexCommand, codexArgs: context.fakeCodexArgs, codexHome: context.codexHome, env: { CODEX_HOME: context.codexHome, AGENTRUN_FAKE_CODEX_MODE: "noisy-reasoning-events" }, oneShot: true }) as JsonRecord;
+    assert.equal(noisyResult.terminalStatus, "completed", "noisy reasoning turn should complete");
+    const noisyEvents = await client.get(`/api/v1/runs/${noisy.runId}/events?afterSeq=0&limit=100`) as { items?: Array<{ type: string; payload: unknown }> };
+    const noisyItems = noisyEvents.items ?? [];
+    assert.equal(noisyItems.some((event) => event.type === "backend_status" && eventPayload(event).phase === "item/reasoning/textDelta"), false, "reasoning textDelta must not be persisted as backend_status");
+    assert.equal(noisyItems.some((event) => event.type === "backend_status" && eventPayload(event).phase === "thread/tokenUsage/updated"), false, "token usage update must not be persisted as backend_status");
+    assert.equal(noisyItems.some((event) => event.type === "backend_status" && eventPayload(event).phase === "account/rateLimits/updated"), false, "rate limit update must not be persisted as backend_status");
+    assert.equal(noisyItems.some((event) => event.type === "backend_status" && eventPayload(event).phase === "warning"), false, "low value warnings must not be persisted as backend_status");
+    assert.equal(noisyItems.some((event) => event.type === "backend_status" && eventPayload(event).phase === "configWarning"), false, "low value config warnings must not be persisted as backend_status");
+    assert.equal(noisyItems.some((event) => event.type === "tool_call" && eventPayloadItem(event).type === "reasoning"), false, "reasoning items must not be persisted as tool_call");
+    assert.ok(noisyItems.some((event) => event.type === "tool_call" && eventPayload(event).method === "item/started" && eventPayloadItem(event).type === "commandExecution"), "real commandExecution tool call should remain visible");
+    assert.ok(noisyItems.some((event) => event.type === "assistant_message" && eventPayload(event).text === "noise filtered final"), "final assistant_message should remain visible");
+    const suppression = noisyItems.find((event) => event.type === "backend_status" && eventPayload(event).phase === "codex-app-server-notifications-suppressed");
+    assert.ok(suppression, "suppression summary must be emitted when noisy notifications are filtered");
+    assert.equal(eventPayload(suppression ?? { payload: {} }).total, 8);
+    assert.equal(JSON.stringify(noisyEvents).includes("internal reasoning must not become durable trace text"), false, "suppression summary must not leak reasoning text");
+    assertNoSecretLeak(noisyEvents);
+
     await runFailureCase({ client, managerUrl: server.baseUrl, context, mode: "missing-turn-result", expectedStatus: "failed", expectedFailureKind: "backend-response-invalid" });
     await runFailureCase({ client, managerUrl: server.baseUrl, context, mode: "provider-401-rpc-error", expectedStatus: "failed", expectedFailureKind: "provider-auth-failed" });
     await runFailureCase({ client, managerUrl: server.baseUrl, context, mode: "provider-429-terminal", expectedStatus: "failed", expectedFailureKind: "provider-rate-limited" });
@@ -131,7 +150,7 @@ const selfTest: SelfTestCase = async (context) => {
     await runSecretFailureCase({ client, managerUrl: server.baseUrl, context });
     await runSpawnFailureCase({ client, managerUrl: server.baseUrl, context });
 
-    return { name: "codex-stdio", tests: ["runner-lease-heartbeat", "codex-stdio-fake-turn", "codex-stdio-projected-writable-home", "codex-stdio-deepseek-profile-fake-turn", "codex-stdio-minimax-m3-profile-fake-turn", "codex-stdio-deepseek-missing-secret-no-fallback", "codex-stdio-minimax-m3-missing-secret-no-fallback", "codex-stdio-config-model-authoritative", "codex-stdio-explicit-model-forwarded", "codex-stdio-final-agent-message-only", "codex-stdio-stale-thread-fallback", "codex-stdio-live-tool-events", "codex-stdio-missing-turn-result", "codex-stdio-provider-auth-failed", "codex-stdio-provider-rate-limited", "codex-stdio-provider-503-rpc-error", "codex-stdio-provider-503-terminal", "codex-stdio-provider-503-retry-event", "codex-stdio-invalid-json", "codex-stdio-timeout", "codex-stdio-secret-unavailable", "codex-stdio-spawn-failure"] };
+    return { name: "codex-stdio", tests: ["runner-lease-heartbeat", "codex-stdio-fake-turn", "codex-stdio-projected-writable-home", "codex-stdio-deepseek-profile-fake-turn", "codex-stdio-minimax-m3-profile-fake-turn", "codex-stdio-deepseek-missing-secret-no-fallback", "codex-stdio-minimax-m3-missing-secret-no-fallback", "codex-stdio-config-model-authoritative", "codex-stdio-explicit-model-forwarded", "codex-stdio-final-agent-message-only", "codex-stdio-stale-thread-fallback", "codex-stdio-live-tool-events", "codex-stdio-noisy-reasoning-suppression", "codex-stdio-missing-turn-result", "codex-stdio-provider-auth-failed", "codex-stdio-provider-rate-limited", "codex-stdio-provider-503-rpc-error", "codex-stdio-provider-503-terminal", "codex-stdio-provider-503-retry-event", "codex-stdio-invalid-json", "codex-stdio-timeout", "codex-stdio-secret-unavailable", "codex-stdio-spawn-failure"] };
   } finally {
     await new Promise<void>((resolve) => server.server.close(() => resolve()));
   }
@@ -168,6 +187,11 @@ function eventPayload(event: { payload: unknown }): JsonRecord {
   return typeof event.payload === "object" && event.payload !== null && !Array.isArray(event.payload) ? event.payload as JsonRecord : {};
 }
 
+function eventPayloadItem(event: { payload: unknown }): JsonRecord {
+  const item = eventPayload(event).item;
+  return typeof item === "object" && item !== null && !Array.isArray(item) ? item as JsonRecord : {};
+}
+
 async function waitForEvent(client: ManagerClient, runId: string, predicate: (event: { type: string; payload: unknown }) => boolean, label: string): Promise<void> {
   const deadline = Date.now() + 3_000;
   while (Date.now() < deadline) {
diff --git a/src/selftest/fake-codex-app-server.ts b/src/selftest/fake-codex-app-server.ts
index 3a994c9..e6d42f4 100644
--- a/src/selftest/fake-codex-app-server.ts
+++ b/src/selftest/fake-codex-app-server.ts
@@ -148,6 +148,25 @@ for await (const line of rl) {
       }, 50);
       continue;
     }
+    if (mode === "noisy-reasoning-events") {
+      turnCounter += 1;
+      const turn = { id: `turn_selftest_${turnCounter}`, status: "completed" };
+      notify("turn/started", { turn });
+      notify("item/started", { item: { id: "reasoning_selftest", type: "reasoning", content: [] } });
+      notify("item/reasoning/textDelta", { itemId: "reasoning_selftest", delta: "internal reasoning must not become durable trace text 1" });
+      notify("item/reasoning/textDelta", { itemId: "reasoning_selftest", delta: "internal reasoning must not become durable trace text 2" });
+      notify("thread/tokenUsage/updated", { usage: { inputTokens: 1, outputTokens: 2 } });
+      notify("account/rateLimits/updated", { limit: "selftest" });
+      notify("warning", { message: "low value warning should be summarized" });
+      notify("configWarning", { message: "low value config warning should be summarized" });
+      notify("item/completed", { item: { id: "reasoning_selftest", type: "reasoning", content: ["internal reasoning must not become durable trace text 3"] } });
+      notify("item/started", { item: { id: "tool_after_noise", type: "commandExecution", command: "echo after-noise" } });
+      notify("item/completed", { item: { id: "tool_after_noise", type: "commandExecution", command: "echo after-noise", status: "completed" } });
+      notify("item/completed", { item: { id: "msg_after_noise", type: "agentMessage", text: "noise filtered final" } });
+      notify("turn/completed", { turn });
+      respond(message.id, { turn });
+      continue;
+    }
     turnCounter += 1;
     const turn = { id: `turn_selftest_${turnCounter}`, status: "completed" };
     notify("turn/started", { turn });