diff --git a/AGENTS.md b/AGENTS.md
index 1f85f724..be5d44e0 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -134,4 +134,5 @@
 - OTel/可观测性: `docs/reference/observability.md`。
 - YAML-first: `docs/reference/yaml-first-ops.md`。
 - Platform infrastructure: `docs/reference/platform-infra.md`。
+- Webterm 配置与受控部署: `docs/reference/webterm.md`。
 - Secretary: `docs/reference/secretary-reference.md`。
diff --git a/config/platform-infra/webterm.yaml b/config/platform-infra/webterm.yaml
index b26ad2fd..09e51389 100644
--- a/config/platform-infra/webterm.yaml
+++ b/config/platform-infra/webterm.yaml
@@ -29,6 +29,15 @@ autoResumePrompt:
     quietPeriodMs: 1500
     timeoutMs: 60000
 
+browserTerminalHistory:
+  desktopScrollbackLines: 8000
+  mobileScrollbackLines: 500
+  mobileMaxWidthPx: 899
+
+browserOutputPolicy:
+  maxFramesPerSecond: 10
+  maxFrameBytes: 65536
+
 defaults:
   targetId: local-7683
 
@@ -86,8 +95,6 @@ targets:
         BROWSER_SNAPSHOT_WRITE_CHUNK_BYTES: "8192"
         BROWSER_MANUAL_REDRAW_MODE: double
         BROWSER_MANUAL_REDRAW_DELAY_MS: "60"
-        OUTPUT_BATCH_MS: "8"
-        OUTPUT_BATCH_BYTES: "32768"
         BROWSER_KEEPALIVE_ENABLED: "true"
         BROWSER_RESUME_PROBE_ENABLED: "false"
         BROWSER_KEEPALIVE_INTERVAL_MS: "30000"
@@ -167,8 +174,6 @@ targets:
         BROWSER_SNAPSHOT_WRITE_CHUNK_BYTES: "8192"
         BROWSER_MANUAL_REDRAW_MODE: double
         BROWSER_MANUAL_REDRAW_DELAY_MS: "60"
-        OUTPUT_BATCH_MS: "8"
-        OUTPUT_BATCH_BYTES: "32768"
         BROWSER_KEEPALIVE_ENABLED: "true"
         BROWSER_RESUME_PROBE_ENABLED: "false"
         BROWSER_KEEPALIVE_INTERVAL_MS: "15000"
diff --git a/docs/reference/webterm.md b/docs/reference/webterm.md
new file mode 100644
index 00000000..1ea24179
--- /dev/null
+++ b/docs/reference/webterm.md
@@ -0,0 +1,18 @@
+# Webterm 配置与受控部署
+
+- 唯一配置来源：
+  - `config/platform-infra/webterm.yaml` 是端口、自动标签、启动模式、浏览器历史和输出聚合策略的 owning YAML；
+  - `build/docker-compose.<port>.yaml` 是受控 CLI 渲染产物，禁止手工维护或在部署后恢复旧内容。
+- 受控入口：
+  - 预览使用 `bun scripts/cli.ts platform-infra webterm plan --target <target>`；
+  - 部署使用 `bun scripts/cli.ts platform-infra webterm apply --target <target> --confirm`；
+  - 收口使用同一入口的 `status` 与 `validate`。
+- 浏览器历史策略：
+  - `browserTerminalHistory.desktopScrollbackLines` 控制桌面端 xterm 历史行数；
+  - `browserTerminalHistory.mobileScrollbackLines` 控制移动端 xterm 历史行数；
+  - `browserTerminalHistory.mobileMaxWidthPx` 与粗指针特征共同决定移动端策略；
+  - 视口类型变化后，已有终端必须同步新上限并截断超出上限的旧行。
+- 输出聚合策略：
+  - `browserOutputPolicy.maxFramesPerSecond` 是每个浏览器连接、每个终端的最大输出消息频率；
+  - `browserOutputPolicy.maxFrameBytes` 是单条聚合输出消息的字节上限；
+  - 后端必须按终端独立排队，小数据在频率窗口内合并，积压数据按窗口顺序发送，禁止用字节阈值绕过频率上限。
diff --git a/scripts/src/platform-infra-webterm.ts b/scripts/src/platform-infra-webterm.ts
index 76bf1a8c..48c2110f 100644
--- a/scripts/src/platform-infra-webterm.ts
+++ b/scripts/src/platform-infra-webterm.ts
@@ -23,6 +23,8 @@ interface WebtermConfig {
   defaults: { targetId: string };
   sessionStartModes: SessionStartModes;
   autoResumePrompt: AutoResumePrompt;
+  browserTerminalHistory: BrowserTerminalHistory;
+  browserOutputPolicy: BrowserOutputPolicy;
   targets: WebtermTarget[];
 }
 
@@ -39,6 +41,17 @@ interface AutoResumePrompt {
   readiness: { minDelayMs: number; minOutputBytes: number; quietPeriodMs: number; timeoutMs: number };
 }
 
+interface BrowserTerminalHistory {
+  desktopScrollbackLines: number;
+  mobileScrollbackLines: number;
+  mobileMaxWidthPx: number;
+}
+
+interface BrowserOutputPolicy {
+  maxFramesPerSecond: number;
+  maxFrameBytes: number;
+}
+
 interface WebtermTarget {
   id: string;
   enabled: boolean;
@@ -59,6 +72,8 @@ interface WebtermTarget {
     autoStartSessions: Array<{ title: string; cwd: string; command: string; cols: number; rows: number; resumePrompt: boolean; fallbackShell: boolean }>;
     sessionStartModes: SessionStartModes;
     autoResumePrompt: AutoResumePrompt;
+    browserTerminalHistory: BrowserTerminalHistory;
+    browserOutputPolicy: BrowserOutputPolicy;
     environment: Record<string, string>;
   };
   publicExposure: {
@@ -256,17 +271,35 @@ function readWebtermConfig(): WebtermConfig {
   const defaults = recordField(yaml, "defaults", "webterm");
   const sessionStartModes = parseSessionStartModes(recordField(yaml, "sessionStartModes", "webterm"), "webterm.sessionStartModes");
   const autoResumePrompt = parseAutoResumePrompt(recordField(yaml, "autoResumePrompt", "webterm"), "webterm.autoResumePrompt");
+  const browserTerminalHistory = parseBrowserTerminalHistory(recordField(yaml, "browserTerminalHistory", "webterm"), "webterm.browserTerminalHistory");
+  const browserOutputPolicy = parseBrowserOutputPolicy(recordField(yaml, "browserOutputPolicy", "webterm"), "webterm.browserOutputPolicy");
   const targetsRaw = yaml.targets;
   if (!Array.isArray(targetsRaw)) throw new Error("webterm.targets must be an array");
   return {
     defaults: { targetId: stringField(defaults, "targetId", "webterm.defaults") },
     sessionStartModes,
     autoResumePrompt,
-    targets: targetsRaw.map((item, index) => parseTarget(asRecord(item, `webterm.targets[${index}]`), `webterm.targets[${index}]`, sessionStartModes, autoResumePrompt)),
+    browserTerminalHistory,
+    browserOutputPolicy,
+    targets: targetsRaw.map((item, index) => parseTarget(
+      asRecord(item, `webterm.targets[${index}]`),
+      `webterm.targets[${index}]`,
+      sessionStartModes,
+      autoResumePrompt,
+      browserTerminalHistory,
+      browserOutputPolicy,
+    )),
   };
 }
 
-function parseTarget(record: Record<string, unknown>, path: string, sessionStartModes: SessionStartModes, autoResumePrompt: AutoResumePrompt): WebtermTarget {
+function parseTarget(
+  record: Record<string, unknown>,
+  path: string,
+  sessionStartModes: SessionStartModes,
+  autoResumePrompt: AutoResumePrompt,
+  browserTerminalHistory: BrowserTerminalHistory,
+  browserOutputPolicy: BrowserOutputPolicy,
+): WebtermTarget {
   const runtime = recordField(record, "runtime", path);
   const exposure = recordField(record, "publicExposure", path);
   const dns = recordField(exposure, "dns", `${path}.publicExposure`);
@@ -295,6 +328,8 @@ function parseTarget(record: Record<string, unknown>, path: string, sessionStart
       autoStartSessions,
       sessionStartModes,
       autoResumePrompt,
+      browserTerminalHistory,
+      browserOutputPolicy,
       environment,
     },
     publicExposure: {
@@ -339,6 +374,8 @@ function renderCompose(target: WebtermTarget): string {
     SESSION_START_MODES_JSON: JSON.stringify(target.runtime.sessionStartModes.options),
     SESSION_START_DEFAULT_MODE: target.runtime.sessionStartModes.defaultMode,
     AUTO_RESUME_PROMPT_JSON: JSON.stringify(target.runtime.autoResumePrompt),
+    BROWSER_TERMINAL_HISTORY_JSON: JSON.stringify(target.runtime.browserTerminalHistory),
+    BROWSER_OUTPUT_POLICY_JSON: JSON.stringify(target.runtime.browserOutputPolicy),
   };
   const envLines = Object.entries(environment)
     .map(([key, value]) => `      ${key}: ${quoteYaml(value)}`)
@@ -442,6 +479,8 @@ function targetSummary(target: WebtermTarget): Record<string, unknown> {
       sendEnter: target.runtime.autoResumePrompt.sendEnter,
       enterDelayMs: target.runtime.autoResumePrompt.enterDelayMs,
     },
+    browserTerminalHistory: target.runtime.browserTerminalHistory,
+    browserOutputPolicy: target.runtime.browserOutputPolicy,
     sourceMounts: target.runtime.sourceMounts.map((mount) => `${mount.source}->${mount.target}${mount.readOnly ? ":ro" : ""}`),
     hostPort: target.runtime.hostPort,
     containerPort: target.runtime.containerPort,
@@ -601,6 +640,27 @@ function parseAutoResumePrompt(record: Record<string, unknown>, path: string): A
   };
 }
 
+function parseBrowserTerminalHistory(record: Record<string, unknown>, path: string): BrowserTerminalHistory {
+  return {
+    desktopScrollbackLines: positiveIntegerField(record, "desktopScrollbackLines", path),
+    mobileScrollbackLines: positiveIntegerField(record, "mobileScrollbackLines", path),
+    mobileMaxWidthPx: positiveIntegerField(record, "mobileMaxWidthPx", path),
+  };
+}
+
+function parseBrowserOutputPolicy(record: Record<string, unknown>, path: string): BrowserOutputPolicy {
+  return {
+    maxFramesPerSecond: positiveIntegerField(record, "maxFramesPerSecond", path),
+    maxFrameBytes: positiveIntegerField(record, "maxFrameBytes", path),
+  };
+}
+
+function positiveIntegerField(record: Record<string, unknown>, key: string, path: string): number {
+  const value = integerField(record, key, path);
+  if (value <= 0) throw new Error(`${path}.${key} must be positive`);
+  return value;
+}
+
 function parseLiteral<T extends string>(value: string, expected: T, path: string): T {
   if (value !== expected) throw new Error(`${path} must be ${expected}`);
   return expected;