diff --git a/internal/cloud/code-agent-chat.mjs b/internal/cloud/code-agent-chat.mjs
index 2133cd7b..131e6f65 100644
--- a/internal/cloud/code-agent-chat.mjs
+++ b/internal/cloud/code-agent-chat.mjs
@@ -2202,6 +2202,12 @@ function detectReadOnlyRunnerIntent(message, options = {}) {
       reason: "Code Agent 安全边界不读取或输出 secret、token、kubeconfig、密码、私钥或环境变量原文。"
     };
   }
+  if (isPcGatewayCodexToolRequest(text)) {
+    return {
+      kind: "none",
+      toolName: "codex-stdio.pc-gateway-wrapper"
+    };
+  }
   const m3IoIntent = detectM3IoIntent(text);
   if (m3IoIntent) {
     return m3IoIntent;
@@ -2221,6 +2227,14 @@ function detectReadOnlyRunnerIntent(message, options = {}) {
   return { kind: "none" };
 }
 
+function isPcGatewayCodexToolRequest(text) {
+  const value = String(text ?? "");
+  const mentionsGatewayTool = /(?:\/app\/tools\/hwlab-gateway-shell\.mjs|hwlab-gateway-shell\.mjs|hardware\.invoke\.shell|PC\s*gateway|gws_DESKTOP-[A-Z0-9-]+|cap_windows_cmd_exec|res_windows_host)/iu.test(value);
+  const mentionsWindowsCommand = /(?:Windows\s+cmd|cmd\s*\/c|shell\.exec|hostname|PowerShell|powershell)/iu.test(value);
+  const mentionsWindowsSkill = /(?:C:\\Users\\liang\\\.agents\\skills|\.agents[\\/]+skills|keil-cli\.py|\bKeil\b|MDK-ARM|\.uvprojx|F:\\Work\\constart|job-status)/iu.test(value);
+  return mentionsGatewayTool && (mentionsWindowsCommand || mentionsWindowsSkill);
+}
+
 function detectExternalNetworkIntent(text) {
   const value = String(text ?? "").trim();
   if (!value) return null;
diff --git a/internal/cloud/code-agent-session-registry.test.mjs b/internal/cloud/code-agent-session-registry.test.mjs
index 5a41ea9e..e3b492fb 100644
--- a/internal/cloud/code-agent-session-registry.test.mjs
+++ b/internal/cloud/code-agent-session-registry.test.mjs
@@ -1889,6 +1889,73 @@ test("Code Agent PC gateway prompt reaches Codex stdio instead of internal hardw
   }
 });
 
+test("Code Agent Keil gateway prompt is not blocked by M3 IO intent guard", async () => {
+  const calls = [];
+  let providerCalled = false;
+  const fakeCodex = await createFakeCodexCommand();
+  const codexHome = await prepareFakeCodexHome();
+  const registry = createCodeAgentSessionRegistry();
+  const manager = createCodexStdioSessionManager({
+    idFactory: () => "ses_keil_gateway_stdio",
+    createRpcClient: async () => createFakeAppServerClient({
+      calls,
+      responses: ["已通过 PC gateway 调用 Windows Keil skill，success=true，return_code=0，生成 FREQ_Controller_FW.hex。"]
+    })
+  });
+
+  try {
+    const payload = await handleCodeAgentChat(
+      {
+        conversationId: "cnv_keil_gateway_stdio",
+        traceId: "trc_keil_gateway_stdio",
+        projectId: "prj_mvp_topology",
+        message: String.raw`请用 /app/tools/hwlab-gateway-shell.mjs 通过 PC gateway 调用 Windows cmd，进入 C:\Users\liang\.agents\skills\keil，然后运行 py -3 keil-cli.py build -p "F:\Work\constart\projects\71-00075-11\FirmWare\MDK-ARM\FREQ_Controller_FW.uvprojx" -t FREQ_Controller_FW；如果返回 job id，请用 py -3 keil-cli.py job-status <job_id> 轮询到终态。`
+      },
+      {
+        now: () => "2026-05-24T14:35:00.000Z",
+        env: {
+          PATH: process.env.PATH,
+          OPENAI_API_KEY: "test-openai-key-material",
+          CODEX_HOME: codexHome,
+          HWLAB_CODE_AGENT_PROVIDER: "codex-stdio",
+          HWLAB_CODE_AGENT_MODEL: "gpt-test",
+          HWLAB_CODE_AGENT_CODEX_COMMAND: fakeCodex.command,
+          HWLAB_CODE_AGENT_CODEX_STDIO_ENABLED: "1",
+          HWLAB_CODE_AGENT_CODEX_STDIO_SUPERVISOR: "repo-owned",
+          HWLAB_CODE_AGENT_CODEX_SANDBOX: "danger-full-access",
+          HWLAB_CODE_AGENT_WORKSPACE: process.cwd(),
+          HWLAB_CODE_AGENT_OPENAI_BASE_URL: "http://172.26.26.227:17680/v1/responses"
+        },
+        sessionRegistry: registry,
+        codexStdioManager: manager,
+        callProvider: async () => {
+          providerCalled = true;
+          throw new Error("text fallback must not be used");
+        },
+        m3IoSkillRequestJson: async () => {
+          throw new Error("Keil gateway prompt must not be routed to M3 IO");
+        }
+      }
+    );
+
+    validateCodeAgentChatSchema(payload);
+    assert.equal(payload.status, "completed");
+    assert.equal(payload.provider, "codex-stdio");
+    assert.equal(payload.responseType, undefined);
+    assert.notEqual(payload.capabilityLevel, HWLAB_M3_IO_CAPABILITY_LEVELS.blocked);
+    assert.equal(providerCalled, false);
+    const turn = calls.find((call) => call.method === "turn/start");
+    assert.ok(turn, "Codex stdio turn/start should be called");
+    assert.match(turn.args.prompt, /\/app\/tools\/hwlab-gateway-shell\.mjs/u);
+    assert.match(turn.args.prompt, /keil-cli\.py build/u);
+    assert.match(turn.args.prompt, /job-status/u);
+    assert.match(turn.args.prompt, /FREQ_Controller_FW\.uvprojx/u);
+  } finally {
+    await rm(fakeCodex.root, { recursive: true, force: true });
+    await rm(codexHome, { recursive: true, force: true });
+  }
+});
+
 function delay(ms) {
   return new Promise((resolve) => setTimeout(resolve, ms));
 }