diff --git a/src/cli/command-catalog.ts b/src/cli/command-catalog.ts
index e668e80cc0f7..264ea5e464c8 100644
--- a/src/cli/command-catalog.ts
+++ b/src/cli/command-catalog.ts
@@ -36,6 +36,7 @@ export type CliCommandPathPolicy = {
   routeConfigGuard: CliRouteConfigGuardPolicy;
   loadPlugins: CliCommandPluginLoadPolicy;
   pluginRegistry: CliPluginRegistryPolicy;
+  ownsProtocolStdout: boolean;
   hideBanner: boolean;
   ensureCliPath: boolean;
   networkProxy: CliNetworkProxyPolicyResolver;
@@ -258,6 +259,11 @@ export const cliCommandCatalog: readonly CliCommandCatalogEntry[] = [
     policy: { loadPlugins: "never", ensureCliPath: false, networkProxy: "bypass" },
   },
   { commandPath: ["acp"], policy: { networkProxy: "bypass" } },
+  {
+    commandPath: ["acp"],
+    exact: true,
+    policy: { ownsProtocolStdout: true },
+  },
   { commandPath: ["approvals"], policy: { networkProxy: "bypass" } },
   { commandPath: ["backup"], policy: { bypassConfigGuard: true, networkProxy: "bypass" } },
   { commandPath: ["chat"], policy: { networkProxy: "bypass" } },
@@ -282,6 +288,11 @@ export const cliCommandCatalog: readonly CliCommandCatalogEntry[] = [
   { commandPath: ["hooks"], policy: { networkProxy: "bypass" } },
   { commandPath: ["logs"], policy: { networkProxy: "bypass" } },
   { commandPath: ["mcp"], policy: { networkProxy: "bypass" } },
+  {
+    commandPath: ["mcp", "serve"],
+    exact: true,
+    policy: { ownsProtocolStdout: true },
+  },
   {
     commandPath: ["node"],
     policy: { networkProxy: "bypass" },
diff --git a/src/cli/command-execution-startup.test.ts b/src/cli/command-execution-startup.test.ts
index 5d346eabf0e8..2a4f6228ca87 100644
--- a/src/cli/command-execution-startup.test.ts
+++ b/src/cli/command-execution-startup.test.ts
@@ -111,6 +111,25 @@ describe("command-execution-startup", () => {
     ).toBe(true);
   });
 
+  it("uses the resolved action command path for protocol startup policy", () => {
+    expect(
+      mod.resolveCliExecutionStartupContext({
+        argv: ["node", "openclaw", "acp", "--token", "-secret"],
+        protocolCommandPath: ["acp"],
+        jsonOutputMode: false,
+        env: {},
+      }).startupPolicy.suppressDoctorStdout,
+    ).toBe(true);
+    expect(
+      mod.resolveCliExecutionStartupContext({
+        argv: ["node", "openclaw", "acp", "--verbose", "client"],
+        protocolCommandPath: ["acp", "client"],
+        jsonOutputMode: false,
+        env: {},
+      }).startupPolicy.suppressDoctorStdout,
+    ).toBe(false);
+  });
+
   it("routes logs to stderr and emits banner only when allowed", async () => {
     await mod.applyCliExecutionStartupPresentation({
       startupPolicy: {
diff --git a/src/cli/command-execution-startup.ts b/src/cli/command-execution-startup.ts
index 208c30579d1e..d9f5baab266e 100644
--- a/src/cli/command-execution-startup.ts
+++ b/src/cli/command-execution-startup.ts
@@ -16,6 +16,7 @@ const hasVersionFlag = (argv: readonly string[]) =>
 
 export function resolveCliExecutionStartupContext(params: {
   argv: string[];
+  protocolCommandPath?: string[];
   jsonOutputMode: boolean;
   env?: NodeJS.ProcessEnv;
   routeMode?: boolean;
@@ -29,6 +30,7 @@ export function resolveCliExecutionStartupContext(params: {
     startupPolicy: resolveCliStartupPolicy({
       argv: params.argv,
       commandPath,
+      protocolCommandPath: params.protocolCommandPath,
       jsonOutputMode: params.jsonOutputMode,
       env: params.env,
       routeMode: params.routeMode,
@@ -43,7 +45,7 @@ export async function applyCliExecutionStartupPresentation(params: {
   showBanner?: boolean;
   version?: string;
 }) {
-  // JSON-mode commands must keep stdout machine-readable; route diagnostics away first.
+  // Machine-readable commands must route diagnostics away before startup can print.
   if (params.startupPolicy.suppressDoctorStdout && params.routeLogsToStderrOnSuppress !== false) {
     routeLogsToStderr();
   }
diff --git a/src/cli/command-path-matches.test.ts b/src/cli/command-path-matches.test.ts
index 4befab16ccd2..7417fe312394 100644
--- a/src/cli/command-path-matches.test.ts
+++ b/src/cli/command-path-matches.test.ts
@@ -9,5 +9,4 @@ describe("command-path-matches", () => {
     expect(matchesCommandPath(["status", "watch"], ["status"], { exact: true })).toBe(false);
     expect(matchesCommandPath(["config", "get"], ["config", "get"], { exact: true })).toBe(true);
   });
-
 });
diff --git a/src/cli/command-path-policy.test.ts b/src/cli/command-path-policy.test.ts
index d4e54bb0ec3a..322af35b7051 100644
--- a/src/cli/command-path-policy.test.ts
+++ b/src/cli/command-path-policy.test.ts
@@ -13,6 +13,7 @@ const DEFAULT_EXPECTED_POLICY: CliCommandPathPolicy = {
   routeConfigGuard: "never",
   loadPlugins: "never",
   pluginRegistry: { scope: "all" },
+  ownsProtocolStdout: false,
   hideBanner: false,
   ensureCliPath: true,
   networkProxy: "default",
diff --git a/src/cli/command-path-policy.ts b/src/cli/command-path-policy.ts
index 8cf538fcee42..e17f8a9cb15f 100644
--- a/src/cli/command-path-policy.ts
+++ b/src/cli/command-path-policy.ts
@@ -14,6 +14,7 @@ const DEFAULT_CLI_COMMAND_PATH_POLICY: CliCommandPathPolicy = {
   routeConfigGuard: "never",
   loadPlugins: "never",
   pluginRegistry: { scope: "all" },
+  ownsProtocolStdout: false,
   hideBanner: false,
   ensureCliPath: true,
   networkProxy: "default",
diff --git a/src/cli/command-startup-policy.test.ts b/src/cli/command-startup-policy.test.ts
index 20e807ed3654..7ec4eefef92d 100644
--- a/src/cli/command-startup-policy.test.ts
+++ b/src/cli/command-startup-policy.test.ts
@@ -235,4 +235,18 @@ describe("command-startup-policy", () => {
       pluginRegistry: { scope: "channels" },
     });
   });
+
+  it("suppresses startup stdout for the mcp serve protocol", () => {
+    expect(resolvePolicy({ commandPath: ["mcp", "serve"] }).suppressDoctorStdout).toBe(true);
+  });
+
+  it("suppresses startup stdout for the bare acp protocol", () => {
+    expect(resolvePolicy({ commandPath: ["acp"] }).suppressDoctorStdout).toBe(true);
+  });
+
+  it("keeps startup stdout for non-protocol commands", () => {
+    expect(resolvePolicy({ commandPath: ["mcp", "list"] }).suppressDoctorStdout).toBe(false);
+    expect(resolvePolicy({ commandPath: ["acp", "client"] }).suppressDoctorStdout).toBe(false);
+    expect(resolvePolicy({ commandPath: ["status"] }).suppressDoctorStdout).toBe(false);
+  });
 });
diff --git a/src/cli/command-startup-policy.ts b/src/cli/command-startup-policy.ts
index a3ae31978c01..860f792e2939 100644
--- a/src/cli/command-startup-policy.ts
+++ b/src/cli/command-startup-policy.ts
@@ -28,12 +28,19 @@ function shouldLoadPlugins(params: {
 export function resolveCliStartupPolicy(params: {
   argv?: string[];
   commandPath: string[];
+  protocolCommandPath?: string[];
   jsonOutputMode: boolean;
   env?: NodeJS.ProcessEnv;
   routeMode?: boolean;
 }) {
-  const suppressDoctorStdout = params.jsonOutputMode;
   const commandPolicy = resolveCliCommandPathPolicy(params.commandPath);
+  // Commander resolves required option values before selecting the action command, so this path
+  // remains authoritative when a protocol option value itself begins with "-".
+  const ownsProtocolStdout = params.protocolCommandPath
+    ? resolveCliCommandPathPolicy(params.protocolCommandPath).ownsProtocolStdout
+    : commandPolicy.ownsProtocolStdout;
+  // Protocol commands own stdout from process startup, before their action installs later routing.
+  const suppressDoctorStdout = params.jsonOutputMode || ownsProtocolStdout;
   const env = params.env ?? process.env;
   return {
     suppressDoctorStdout,
diff --git a/src/cli/program/preaction.test.ts b/src/cli/program/preaction.test.ts
index b65f3ae73582..47fba188b87e 100644
--- a/src/cli/program/preaction.test.ts
+++ b/src/cli/program/preaction.test.ts
@@ -146,6 +146,19 @@ describe("registerPreActionHooks", () => {
       .command("status")
       .option("--json")
       .action(() => {});
+    const acp = programLocal
+      .command("acp")
+      .option("--token <token>")
+      .option("--verbose")
+      .action(() => {});
+    acp
+      .command("client")
+      .option("--cwd <dir>")
+      .action(() => {});
+    programLocal
+      .command("mcp")
+      .command("serve")
+      .action(() => {});
     const gateway = programLocal
       .command("gateway")
       .option("--force")
@@ -607,6 +620,45 @@ describe("registerPreActionHooks", () => {
     expect(routeLogsToStderrMock).not.toHaveBeenCalled();
   });
 
+  it("uses the Commander action path for protocol stdout ownership", async () => {
+    await runPreAction({
+      parseArgv: ["acp"],
+      processArgv: ["node", "openclaw", "acp", "--token", "-secret"],
+    });
+
+    expect(routeLogsToStderrMock).toHaveBeenCalledOnce();
+    expect(ensureConfigReadyMock).toHaveBeenCalledWith({
+      runtime: runtimeMock,
+      commandPath: ["acp"],
+      suppressDoctorStdout: true,
+    });
+
+    vi.clearAllMocks();
+    await runPreAction({
+      parseArgv: ["acp", "client"],
+      processArgv: ["node", "openclaw", "acp", "--verbose", "client"],
+    });
+
+    expect(routeLogsToStderrMock).not.toHaveBeenCalled();
+    expect(ensureConfigReadyMock).toHaveBeenCalledWith({
+      runtime: runtimeMock,
+      commandPath: ["acp", "client"],
+    });
+
+    vi.clearAllMocks();
+    await runPreAction({
+      parseArgv: ["mcp", "serve"],
+      processArgv: ["node", "openclaw", "mcp", "serve"],
+    });
+
+    expect(routeLogsToStderrMock).toHaveBeenCalledOnce();
+    expect(ensureConfigReadyMock).toHaveBeenCalledWith({
+      runtime: runtimeMock,
+      commandPath: ["mcp", "serve"],
+      suppressDoctorStdout: true,
+    });
+  });
+
   it("does not preload plugins for agents list JSON output", async () => {
     await runPreAction({
       parseArgv: ["agents", "list"],
diff --git a/src/cli/program/preaction.ts b/src/cli/program/preaction.ts
index 56b4ab204ce8..379fdeb74f8b 100644
--- a/src/cli/program/preaction.ts
+++ b/src/cli/program/preaction.ts
@@ -53,6 +53,16 @@ function getRootCommand(command: Command): Command {
   return current;
 }
 
+function getActionCommandPath(actionCommand: Command): string[] {
+  const commandPath: string[] = [];
+  let current: Command | null = actionCommand;
+  while (current.parent) {
+    commandPath.unshift(current.name());
+    current = current.parent;
+  }
+  return commandPath;
+}
+
 function getCliLogLevel(actionCommand: Command): LogLevel | undefined {
   const root = getRootCommand(actionCommand);
   if (typeof root.getOptionValueSource !== "function") {
@@ -119,6 +129,7 @@ export function registerPreActionHooks(program: Command, programVersion: string)
     const jsonOutputMode = isCommandJsonOutputMode(actionCommand, argv);
     const { commandPath, startupPolicy } = resolveCliExecutionStartupContext({
       argv,
+      protocolCommandPath: getActionCommandPath(actionCommand),
       jsonOutputMode,
       env: process.env,
     });