diff --git a/packages/commands/src/commands/update.ts b/packages/commands/src/commands/update.ts
index ee6e3e5..fbca980 100644
--- a/packages/commands/src/commands/update.ts
+++ b/packages/commands/src/commands/update.ts
@@ -142,6 +142,7 @@ export default defineCommand({
           `\n${color.green(`\u2713 Update complete: ${currentVersion} \u2192 ${newVer}`)}\n`,
         );
         writeUpdateState(newVer);
+        updateAgentSkill(color);
       } catch (error) {
         const message = error instanceof Error ? error.message : String(error);
         const reinstall =
diff --git a/packages/commands/tests/update-binary-skill-sync.test.ts b/packages/commands/tests/update-binary-skill-sync.test.ts
new file mode 100644
index 0000000..6a55a8b
--- /dev/null
+++ b/packages/commands/tests/update-binary-skill-sync.test.ts
@@ -0,0 +1,62 @@
+import { mkdtempSync, rmSync } from "node:fs";
+import { tmpdir } from "node:os";
+import { join } from "node:path";
+import { afterEach, beforeEach, expect, test, vi } from "vite-plus/test";
+
+const runtimeMocks = vi.hoisted(() => ({
+  performBinaryUpdate: vi.fn(),
+}));
+
+const childProcessMocks = vi.hoisted(() => ({
+  execSync: vi.fn(),
+}));
+
+vi.mock("bailian-cli-runtime", async (importOriginal) => {
+  const actual = await importOriginal<typeof import("bailian-cli-runtime")>();
+  return { ...actual, performBinaryUpdate: runtimeMocks.performBinaryUpdate };
+});
+
+vi.mock("child_process", async (importOriginal) => {
+  const actual = await importOriginal<typeof import("child_process")>();
+  return { ...actual, execSync: childProcessMocks.execSync };
+});
+
+import updateCommand from "../src/commands/update.ts";
+
+let configDir: string;
+let previousConfigDir: string | undefined;
+let previousInstallMethod: string | undefined;
+
+beforeEach(() => {
+  configDir = mkdtempSync(join(tmpdir(), "bl-update-binary-"));
+  previousConfigDir = process.env.BAILIAN_CONFIG_DIR;
+  previousInstallMethod = process.env.BAILIAN_INSTALL_METHOD;
+  process.env.BAILIAN_CONFIG_DIR = configDir;
+  process.env.BAILIAN_INSTALL_METHOD = "binary";
+  runtimeMocks.performBinaryUpdate.mockResolvedValue("1.15.0");
+});
+
+afterEach(() => {
+  if (previousConfigDir === undefined) delete process.env.BAILIAN_CONFIG_DIR;
+  else process.env.BAILIAN_CONFIG_DIR = previousConfigDir;
+  if (previousInstallMethod === undefined) delete process.env.BAILIAN_INSTALL_METHOD;
+  else process.env.BAILIAN_INSTALL_METHOD = previousInstallMethod;
+  rmSync(configDir, { recursive: true, force: true });
+  vi.clearAllMocks();
+});
+
+test("binary bl update syncs bailian skills after the CLI update succeeds", async () => {
+  await updateCommand.run({
+    identity: {
+      binName: "bl",
+      clientName: "bailian-cli",
+      npmPackage: "bailian-cli",
+      version: "1.14.3",
+    },
+    flags: { to: "1.15.0" },
+    settings: {},
+  } as never);
+
+  expect(runtimeMocks.performBinaryUpdate).toHaveBeenCalledWith("1.15.0");
+  expect(childProcessMocks.execSync).toHaveBeenCalledWith("bl skill init", { stdio: "inherit" });
+});
diff --git a/packages/runtime/src/utils/update-checker.ts b/packages/runtime/src/utils/update-checker.ts
index 1a79a0a..65999c0 100644
--- a/packages/runtime/src/utils/update-checker.ts
+++ b/packages/runtime/src/utils/update-checker.ts
@@ -209,6 +209,25 @@ function errorMessage(err: unknown): string {
   return String(err);
 }
 
+async function syncAgentSkillsAfterUpdate(
+  dim: string,
+  green: string,
+  yellow: string,
+  reset: string,
+): Promise<void> {
+  try {
+    process.stderr.write(`  ${dim}Syncing agent skill...${reset}\n`);
+    const { execSync } = await import("child_process");
+    execSync("bl skill init", { stdio: "inherit" });
+    process.stderr.write(`  ${green}\u2713 Agent skill updated.${reset}\n\n`);
+  } catch (error) {
+    process.stderr.write(
+      `  ${yellow}\u26a0 Agent skill sync failed: ${errorMessage(error)}${reset}\n`,
+    );
+    process.stderr.write(`  ${yellow}  Run manually: bl skill init${reset}\n\n`);
+  }
+}
+
 /**
  * Perform auto-update for npm or binary installs.
  * Returns true if update succeeded, false otherwise.
@@ -256,6 +275,7 @@ export async function performAutoUpdate(
       writeState({ lastChecked: Date.now(), latestVersion: newVer });
       process.stderr.write(`  ${green}✓ Update complete: ${currentVersion} → ${newVer}${reset}\n`);
       process.stderr.write(`  ${dim}Run ${cyan}bl --version${reset}${dim} to verify.${reset}\n\n`);
+      await syncAgentSkillsAfterUpdate(dim, green, yellow, reset);
       pendingNotification = null;
       return true;
     } catch (err) {
@@ -297,14 +317,7 @@ export async function performAutoUpdate(
     );
     process.stderr.write(`  ${dim}Run ${cyan}bl --version${reset}${dim} to verify.${reset}\n\n`);
 
-    try {
-      process.stderr.write(`  ${dim}Syncing agent skill...${reset}\n`);
-      execSync(`bl skill init`, { stdio: "inherit" });
-      process.stderr.write(`  ${green}✓ Agent skill updated.${reset}\n\n`);
-    } catch (err) {
-      process.stderr.write(`  ${yellow}⚠ Agent skill sync failed: ${errorMessage(err)}${reset}\n`);
-      process.stderr.write(`  ${yellow}  Run manually: bl skill init${reset}\n\n`);
-    }
+    await syncAgentSkillsAfterUpdate(dim, green, yellow, reset);
 
     pendingNotification = null;
     return true;
diff --git a/packages/runtime/tests/update-checker.test.ts b/packages/runtime/tests/update-checker.test.ts
index 94886ea..7c1dc0b 100644
--- a/packages/runtime/tests/update-checker.test.ts
+++ b/packages/runtime/tests/update-checker.test.ts
@@ -1,13 +1,58 @@
-import { expect, test } from "vite-plus/test";
+import { mkdtempSync, rmSync } from "node:fs";
+import { tmpdir } from "node:os";
+import { join } from "node:path";
+import { afterEach, beforeEach, expect, test, vi } from "vite-plus/test";
+
+const binaryUpdateMocks = vi.hoisted(() => ({
+  performBinaryUpdate: vi.fn(),
+}));
+
+const childProcessMocks = vi.hoisted(() => ({
+  execSync: vi.fn(),
+}));
+
+vi.mock("../src/utils/binary-update.ts", async (importOriginal) => {
+  const actual = await importOriginal<typeof import("../src/utils/binary-update.ts")>();
+  return { ...actual, performBinaryUpdate: binaryUpdateMocks.performBinaryUpdate };
+});
+
+vi.mock("child_process", async (importOriginal) => {
+  const actual = await importOriginal<typeof import("child_process")>();
+  return { ...actual, execSync: childProcessMocks.execSync };
+});
+
 import {
   compareVersion,
   isMajorUpgrade,
   isNewerVersion,
   isPrerelease,
   parseVersion,
+  performAutoUpdate,
   shouldAutoUpdate,
 } from "../src/utils/update-checker.ts";
 
+let configDir: string;
+let previousConfigDir: string | undefined;
+let previousInstallMethod: string | undefined;
+
+beforeEach(() => {
+  configDir = mkdtempSync(join(tmpdir(), "bl-auto-update-binary-"));
+  previousConfigDir = process.env.BAILIAN_CONFIG_DIR;
+  previousInstallMethod = process.env.BAILIAN_INSTALL_METHOD;
+  process.env.BAILIAN_CONFIG_DIR = configDir;
+  process.env.BAILIAN_INSTALL_METHOD = "binary";
+  binaryUpdateMocks.performBinaryUpdate.mockResolvedValue("2.0.0");
+});
+
+afterEach(() => {
+  if (previousConfigDir === undefined) delete process.env.BAILIAN_CONFIG_DIR;
+  else process.env.BAILIAN_CONFIG_DIR = previousConfigDir;
+  if (previousInstallMethod === undefined) delete process.env.BAILIAN_INSTALL_METHOD;
+  else process.env.BAILIAN_INSTALL_METHOD = previousInstallMethod;
+  rmSync(configDir, { recursive: true, force: true });
+  vi.clearAllMocks();
+});
+
 test("parseVersion strips pre-release and build metadata", () => {
   expect(parseVersion("1.4.2")).toEqual([1, 4, 2]);
   expect(parseVersion("2.0.0-beta.1")).toEqual([2, 0, 0]);
@@ -124,3 +169,11 @@ test("shouldAutoUpdate only targets stable releases with a significant gap", ()
   // Same core, release over its pre-release: notify only (no major gap).
   expect(shouldAutoUpdate("1.4.2", "1.4.2-beta.1")).toBe(false);
 });
+
+test("binary auto-update syncs bailian skills after the CLI update succeeds", async () => {
+  const updated = await performAutoUpdate("1.14.3", "2.0.0");
+
+  expect(updated).toBe(true);
+  expect(binaryUpdateMocks.performBinaryUpdate).toHaveBeenCalledWith("2.0.0");
+  expect(childProcessMocks.execSync).toHaveBeenCalledWith("bl skill init", { stdio: "inherit" });
+});